Blast Resistant Glazing Design 2007 User`s Manual
Contents
1. 2 4 Save Changes to Design Opening an Existing Design The user can open an existing document in three ways The first consists of pressing File Open Project as Figure 2 5 shows The second consists of pressing the Open File button on the tool bar The Open window Figure 2 6 then appears Follow the path to the desired project file and press the Open button on the bottom of the Open Window as Figure 2 7 shows This opens the details of the design from the file If the Open Project button was pressed by mistake simply press the Cancel button and the programs returns to the current project The third consists 12 of double clicking on the desired file without first opening the program This action automatically opens Blast Resistant Glazing Design 2007 with the design information from the previously saved file loaded Save Project Ctrl S Save Project As Print Project Report Ctrl P Project Info taidh af Figure 2 5 Opening an Existing Project la Example Design brd My Recent Documents 3 Desktop My Documents My Computer File name z My Network Files of type Design D br x Places J Open as read only Figure 2 6 Open Window 13 Saving a Design To save a design press File gt Save Project Figure 2 7 or File gt Save Project As Figure 2 8 Pressing the Save button produces the same result as pressing File g2. 4 5 1 2 Heat Strengthened Glass Heat strengthened glass consists of a flat monolithic glass lite of uniform thickness that has been subjected to a special heat treatment process where the residual surface compression ranges from 24 MPa 3500 psi to 52 MPa 7500 psi 4 5 2 Double Glazed Insulating Unit Any combination of two glass lites enclosing a sealed space filled with air or other gas 4 5 2 1 Outboard Lite The outboard lite of an insulating glass unit is the lite that faces toward the outside of the building Blast Resistant Glazing Design 2007 allows the user to select laminated or monolithic glass fabricated with annealed or heat strengthened glass for the outboard lite To select the outboard lite as monolithic uncheck the box marked check for laminated shown in Figure 4 7 27 4 5 2 2 Inboard Lite The inboard lite is the lite of an insulating glass unit that faces toward the inside of the building Consistent with ASTM F 2248 03 Blast Resistant Glazing Design 2007 requires laminated glass for the inboard lite Blast Resistant Glazing Design 2007 allows fabrication of the laminated glass with either annealed or heat strengthened glass Glass Construction m Air Space 05 in Outboard Lite Inboard Lite Glass Type Glass Type Annealed h Annealed v V Check for Laminated G Figure 4 7 Double Glazed Insulating Unit 4 5 2 3 Air Space The air spaced is the sealed space in an insulating glass
3. with a design threat Blast Resistant Glazing Design 2007 accepts TNT charge sizes ranging from 10 Ib 4 54 kg to 2000 Ib 907 kg Rectangular Dimensions The Rectangular Dimensions section allows the user to input the size of the fenestration to be glazed Ambiguity exists in the design community as to whether these dimensions represent the size of the blast resistant glazing itself or the raw opening size This is a question that the glazing designer must answer In general using the raw opening dimensions will result in acceptable if conservative glass thickness selection 25 4 5 Glass Constructions Blast Resistant Glazing Design 2007 designs for glazing constructions of a single glazed lite or double glazed insulating unit as indicated by Figure 4 5 Glass Construction Single Glazed Lite ka Figure 4 5 Glass Constructions 4 5 1 Single Glazed Lite For a single glazed lite Blast Resistant Glazing Design 2007 facilitates designs only with laminated glass fabricated with annealed or heat strengthened glass plies as shown in Figure 4 6 The program uses only laminated glass with nominal 6 mm 1 4 in or larger thickness for blast resistant glazing design Single Lite Glass Type Annealed v Figure 4 6 Single Glazed Lite 26 4 5 1 1 Annealed Glass Annealed Glass consists of a flat monolithic glass lite of uniform thickness having residual surface stresses that are nearly zero
4. Chapter I 1 1 1 2 Chapter II 2 1 2 2 2 3 2 4 2 5 2 6 2 1 2 8 Chapter III 3 1 3 2 3 3 Chapter IV 4 1 4 2 4 3 4 4 4 5 Table of Contents Introduction pt DON neer ani a Belen viet e ai 4 EE A Getting Started Opening Blast Resistant Glazing Design 2001 7 Disclaimer and LIESE eege Ser edEeer eege 7 Tool B EE 11 Starting a New Design EEN 11 Opening an Existing Design EE 12 Savine a LDS SUM gs ccna aoa EE 14 DEG SAVE PROJECE onne hrenn a i 15 26 2 SAV AS EE 15 System of UNIS eege e EEA AE AE 16 Printing Ott eebe 17 Project Information EE Reeder 19 Descriptio e ete entre E Er ena ee ere E ee 20 Closing the Project Information WindoW eeeeeeeeeeeeeeese 20 Design Input PROCESS ege EE 21 User e EE 23 RER EC E 24 43L UEC ASQUOrO EE 25 BD De NS CHOS A enaa aa a AA 25 43a NEE 25 Rectangular Dimensions ssssssesssesesseresseesseesseessereseresseesse 25 Glass One sinnene a a E 26 4 5 1 Single Kleren eege ees eneen 26 KSE tele Tee 27 4 5 1 2 Heat Strengthened Glass 27 4 5 2 Double Glazed Insulating Un 27 4 5 2 MOU O ATA Litenes ne S ce eile Gunes 27 4 5 2 2 Inboard D E 28 43 23 Ee 28 4 5 2 4 Other Definitions sessseensssesesssseesssssssse 29 Chapter V 5 1 5 2 5 3 5 4 5 5 5 6 Design Results TEA A A T 30 Design Ee RRE 31 5 2 1 Equivalent 3 Second Duration Design Load 31 5 2 2 Load RESIS ANCE eege eeh ebe 32 5 2 3 Approximate Maximum A
5. Framing and Attachment Section 34 Comment Section Within AM E 1300 02 acce 35 Comment Section Beyond ASTM RI 35 CHAPTER Introduction 1 1 Introduction Blast Resistant Glazing Design 2007 uses ASTM E 1300 and ASTM F 2248 standards to size rectangular laminated glass and insulating glass constructions fabricated with at least one laminated glass lite to resist an explosive threat The software finds its basis in the paper Considerations for Blast Resistant Design by H Scott Norville and Edward J Conrath published in the ASCE Journal of Architectural Engineering published September 2001 ASTM F 2248 Standard Practice for Specifying an Equivalent 3 Second Design Loading for Blast Resistant Glazing Fabricated with Laminated Glass and ASTM E 1300 Standard Practice for Determining Load Resistance of Glass in Buildings Features Blast Resistant Glazing Design 2007 uses an UFC 4 010 01 Exp Wt UFC 4 010 01 Exp Wt I ISC Medium Threat Level GSA Level C an ISC Higher Threat Level GSA Level D or a user defined threat level in terms of an equivalent TNT charge size and standoff distance Blast Resistant Glazing Design 2007 converts this threat level to a 3 second duration equivalent design load following procedures in ASTM F 2248 and sizes laminated glass or symmetric insulating glass fabricated with at least one laminated glass lite using procedures in ASTM E1300 to resist the 3 second duration equivalent design load T
6. Type Annealed D Rectangular Dimensions L Width 0 in Height D in Calculate Figure 4 3 Design Input Window 23 4 3 Design Blast Details The Design Blast Details section allows the user to define the design blast threat by selecting an UFC 4 010 01 Exp Wt I UFC 4 010 01 Exp Wt Il ISC Medium Threat GSA Level C an ISC High Threat GSA Level D or a User Defined blast as shown in Figure 4 4 The UFC 4 010 01 threat types require a user defined standoff distance The ISC GSA threat types do not require any user input Lastly a User Defined blast requires an equivalent hemispherical TNT charge size and standoff distance to calculate the equivalent 3 second duration equivalent design load acting on the glazing amp Design Input Design Blast Details UFC 4 010 01 Exp wet z ISC Higher Threat GSA Level D User Defined Figure 4 4 Design Blast Details 24 4 4 4 3 1 4 3 2 4 3 2 UFC 4 010 01 Choosing UFC 4 010 01 Exp Wt or UFC 4 010 01 Exp Wt II defines a blast threat consistent with Unified Facilities Criteria as defined by the US Government ISC GSA Choosing ISC Medium Threat GSA Level C or ISC Higher Threat GSA Level D defines a blast threat consistent with existing US Government definitions User Defined A user defined blast requires the user to input the equivalent hemispherical TNT charge size and standoff distance associated
7. ast resistant glazing will fracture safely If the load resistance of a blast resistant glazing falls beyond the limits of ASTM E 1300 for the current design Blast Resistant Glazing Design 2007 displays a load resistance of N A for the current design and does not display the glazing design section explained in Section 5 2 Approximate Maximum Air Blast Pressure If a User Defined threat is selected the program displays an approximate maximum air blast pressure For UFC 4 010 01 and ISC GSA threat types the program does not display an approximate maximum air blast pressure for security reasons 32 5 3 Glazing Design The glazing design Figure 5 3 section displays the calculated nominal thickness of glass that has load resistance greater than the equivalent 3 second duration design load according to ASTM E1300 The program also displays the minimum nominal thickness of the PVB Interlayer for the each laminated glass lite If the load resistance of a blast resistant glazing falls beyond the limits of ASTM E 1300 for the current design the program does not display the Glazing Design section Glazing Design Outboard Lite Nominal Thickness 1 4 in Minimum Nominal DND Thickness 0 030 in Inboard Lite Nominal Thickness 1 4 in Minimum Nominal DND Thickness 0 030 in Figure 5 3 Glazing Design Section 5 3 1 PVB Interlayer Nominal Thickness Blast Resistant Glazing Design 2007 determines the minimum nom
8. atisfies the requirements for a medium level of protection as defined in UFC 4 00 01 Figure 5 1 Design Results Window 30 5 2 Design Load Details The Design Load Details section Figure 5 2 of the Design Results window displays the equivalent 3 second duration design load the load resistance of the blast resistant glazing and the approximate maximum air blast pressure When applicable Design Load Details Equivilant 3 sec Design Load 58 1 psf Load Resistance 124 psf Approximate Maximum Air Blast Pressure 4 410 psi Figure 5 2 Design Load Details 5 2 1 Equivalent 3 Second Duration Design Load Blast Resistant Glazing Design 2007 uses the procedures in ASTM E 2248 to determine the equivalent 3 second duration design load for the blast resistant glazing It then follows procedures in ASTM E 1300 to determine the required glazing thickness es for the blast resistant glazing so that its load resistance exceeds the equivalent 3 second duration design load This value is not given for UFC 4 010 01 threat types 31 5 2 2 5 2 3 Load Resistance The load resistance is the uniform lateral load that a glass construction can sustain based upon a given probability of breakage and load duration ASTM E 1300 uses a 3 second load duration and a probability of breakage of 8 lites per 1000 at its first occurrence of the design loading In the event of a blast loading occurring equal to the design threat bl
9. ction Current Page C Pages J Figure 2 12 Print Window 18 CHAPTER II Project Information 3 1 Access To access the Project Information window click on File gt Project Info Figure 3 1 6 Blast Resistant Glazing Design 2007 Design2 brd File Input Tools Window Help New Project Open Project Ctrl O Save Project Ctrl S Glass Constr Save Project As Print Project Report Ctrl P Single Glaz Project Info Single Lite ft Glass Typ IV Chec Width nis Figure 3 1 Project Information Access 19 3 2 3 3 Description The Project Information window Figure 3 2 contains reference information about the design project that includes the project name location and designer The window provides a field for comments and other information relevant to the project This information is displayed on the report Project Information data are for the user s information only The software does not require this information to perform design calculations E Pro ject Information D X Project Name Il Location By Start Date 3 9 2007 v Comments Done Figure 3 2 Project Information Window Closing the Project Information Window To close the Project Information window click on the Done button or press the X button at the top right hand corner of the window Although the window is closed the program stores a
10. e stiffness of members supporting any glass edge shall be sufficient that under an equivalent 3 sec design load edge deflections of glazing shall not exceed L 160 where L denotes the length of the supported edge 5 The non factored load values for laminated glass are representative of test data and calculations performed for polyvinyl butyric interlayer at a temperature of 50 C 122 F For other limiting conditions that may apply refer to Section 5 of ASTM E1300 local building codes and ASTM F 2248 Standard Practice to Specify an Equivalent 3 second Duration Design Loading for Blast Resistant Glazing Fabricated with Laminated Glass SDG does not guarantee and disclaims any responsibility for any particular results relating to the use of the Blast Resistant Glazing Design 2007 Software Program SDG disclaims any liability for any personal injury or any loss or damage of any kind including all indirect special or consequential damages and lost profits arising out of or relating to the use of the Blast Resistant Glazing Design 2007 Software Program 2 3 2 4 New Design Tool Bar The tool bar shown in Figure 2 2 allows one click access of many important features in Blast Resist Glazing 2007 The New Design icon allows the user to create a new design as described in Section 2 4 The Open Design icon allows the user to open a previously saved blast resistant glazing design as described in Section 2 5 The Save Design ico
11. he resulting single laminated glass lite or insulating glass unit when supported properly will fracture safely and provide blast resistance in explosions up to the design threat level For larger explosions the blast resistant glazing still affords some protection Blast Resistant Glazing Design 2007 provides recommendations concerning the appropriate size of a sealant bead to attach the blast resistant glazing to the window frame and gives forces necessary to design connections to attach window frames to the structure As input to Blast Resistant Glazing Design 2007 the user provides the threat level the rectangular dimensions of the fenestration and the desired window glass construction i e single laminated glass or an insulating glass unit fabricated with at least one laminated glass lite The window frame must support the blast resistant glazing continuously along all four sides Blast Resistant Glazing Design 2007 uses the following constructions for blast resistant glazing single laminated glass fabricated with either annealed or heat strengthened glass plies and a PVB interlayer or insulating glass units The program allows one of the two following insulating glass constructions 1 a monolithic glass lite facing the outside of the building and a laminated glass lite facing the inside or 2 laminated glass for both lites of the insulating glass unit As stated above all glass plies can be either annealed or heat strengthened glas
12. inal thickness for the PVB interlayer for each lite For laminated glass with heat strengthened lites the minimum PVB interlayer nominal thickness shall be 1 52 mm 0 060 in For laminated glass with annealed glass lites the minimum PVB interlayer nominal thickness shall be 0 76 mm 0 030 in 33 5 4 Framing and Attachment Requirements This section gives the design requirement for the framing and window attachment as Figure 5 43 shows The first comment displays the recommended size of the structural sealant bead to attach the blast resistant glazing to the frame The second comment gives the uniformly distributed static design load acting over the window surface area that the frame and its attachment to the building must resist in the event that the design blast occurs Framing and Attachment Requirements The blast resistant design requires wet glazing in frame with a 1 4 in square bead The window glass frame must resist a 445 psf uniformly distributed static design load acting over the window surface area Figure 5 4 Framing and Attachment Section 34 5 5 Comments The comment section Figure 5 5 gives additional information for the blast resistant glazing design The comment section explains the GSA and or UFC 4 010 01 Hazard Protection level for the design A GSA level 3A is a High Protection Very Low Hazard performance criterion Under this criterion in the event of a design level blast the glazing c
13. ir Blast Pressure 32 Cola ZIT DIG STON E 33 5 3 1 PVB Interlayer Nominal Thickness eseeeeeeee 33 Framing and Attachment Reourement cee eeeeeeeeeeeeees 34 Comments ee ee 35 Closing the Design Results Window n e 36 Figure 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 2 10 2 11 2 12 3 1 3 2 4 1 4 2 4 3 4 4 4 5 4 6 4 7 5 1 5 2 5 3 5 4 5 5 5 6 List of Figures Title Page Disclaimer and Lmtatons eeeceeeseeeeeseceeseeeeeneeeeaee 8 Fool Baf echt eorn eee ra Bes ahead ate de celiac ate 11 New PRO COL race cca cr odie GY Rae EE ERARE RR 12 Save Changes WEE 12 Opening an Existing Project cccsccccssresesereserenesenesenenes 13 Open Widows sisir K EEE meee 13 Save EE 14 Saye EE 14 Save As WINdOW cesscsisiiisaeinnii i an eel 15 System WIS EEN 16 Print Project R port secs Siete iter viernes 17 Print Ae 18 Project Information ACCESS ss s cssssssstssesosstdveestanedaztawreelivacetens 19 Project Information Window ssesssesesessssereseeesseesseresssessee 20 Minimized Design Input Window sssr 21 een ACCESS civic uk as aida eet 22 Design Input WindoW sesssesesseessesseesserssseesseesssresseessee 23 Desigm Blast RE 24 Glass C ONSUUCH Sassena enge eege 26 Sine Glazed EE 26 Double Glazed Insulating Unmute 28 Design Results Window sicecccsccssaceressteseesbecentiasedetioestessestcvess 30 Design Loads etlech tee eeh eege 31 Glazing Design SOCH ON geetgeeeebree eer le nue 33
14. ll the information for the current project To edit the data in this window reopen the Project Information window and edit as necessary 20 Chapter IV Design Input 4 1 Access Upon startup of the program Blast Resistant Glazing Design 2007 automatically displays the Design Input window From time to time the user might close or minimize this window Although this window is closed Blast Resistant Glazing Design 2007 stores all the information for the current project If the window is minimized Blast Resistant Glazing Design 2007 places the window in the bottom left hand corner of the window as shown in Figure 4 1 Press the Restore button to activate the window If the window is closed the program hides the window To access the Design Input window select on nput gt Individual Lite as Figure 4 2 shows File Input Tools Window Help OZW amp us si Figure 4 1 Minimized Design Input Window 21 Figure 4 2 Design Input Access 22 4 2 User Input Figure 4 3 shows the Design Input window This window facilitates input of the required information for a blast resistant glazing design This window has three sections the Design Blast Details section the Rectangular Dimensions section and the Glass Construction section Design Input ka kb g Design Blast Details Glass Construction Single Glazed Lte z Single Lite Standoff Distance lt 148 ft D ft Glass
15. lso has System of Units buttons on the toolbar Figure 2 2 Press the desired unit system button on the tool bar Blast Resistant Glazing Design 2007 Design2 brd File Input Tools Window Help Ch Systemof Units gt v US SI I amp Design Input Design Blast Details Glass Const UC An Ee v Single Gla Single Lite Standoff Distance lt 148 ft Of Glass Ty Rectangular Dimensions 7 Width ma Figure 2 10 System of Units 2 8 Printing a Document Blast Resistant Glazing Design 2007 prints a design report for the current project To print a design report press File gt Print Project Report as Figure 2 11 shows or press the button located on the toolbar Figure 2 2 A Print dialog box appears shown in Figure 2 12 Select the current printer and press the Print button to print the current blast resistant glazing design Blast Resistant Glazing Design 2007 Design2 brd File Input Tools Window Help New Project Open Project Ctrl 0 Save Project Ctrl S Save Project As Glass Cons Print Project Report Ctrl P Single Gle Project Info Single Li ft Glass T Anne Width nia Figure 2 11 Print Project Report 17 General Select Printer Microsoft Office Document Image Writer le D Lal Status Ready T Print to file Preferences Location Workroom can Find Printer Page Range All Number of copies fi C Sele
16. n allows the user to save the current design as described in Section 2 6 The Print Design icon allows the user to print a design report as described in Section 2 8 The System of Units icons allow the user to toggle between US and SI units with a click of the button as described in Section 2 7 Open Design Save Design Print Design 7 S ao of Units LO cb s Figure 2 2 Toolbar Starting a New Design To start a new design click File gt New Project as Figure 2 3 shows lf a current project is open the program asks Save changes to Design before closing as Figure 2 4 shows Press Yes button to save current project information before starting the new project This action brings up either the Save As or the Save dialog box Use of these dialog boxes is described below Press No button to discard current project information This action resets all values to default settings Press Cancel button to return to the current project information 11 2 5 Z Blast Resistant Glazing Design 2007 Design1 brd File Input Tools Window Help New Project Open Project Ctrl O Save Project Ctrl S Save Project As Glass Constru Print Project Report Ctrl P Single Glaze Project Info Single Lite ft Glass Type Anneale Vv UE I E Figure 2 3 New Project Blast Resistant Glazing Design 2007 1 0 Save Changes to Design1 brd before closing Figure
17. n blast resistant glazing fabricated with laminated glass subject to the following conditions 1 The glass is free of edge and surface damage have read and understand the limitations of this software Figure 2 1 Disclaimer and Limitations The Disclaimer and Limitations states Procedures followed in determining the load resistance of this window glass is in accordance with ASTM E1300 04 When the load resistance of a window falls beyond the limits of ASTM E 1300 04 the software will provide a statement to that effect Procedures followed in determining the equivalent 3 sec blast design load are in accordance with ASTM F 2248 Standard Practice to Specify an Equivalent 3 second Duration Design Loading for Blast Resistant Glazing Fabricated with Laminated Glass Upon the release of the final draft of this standard this software program will be updated to comply with any changes that might be made In the event a blast occurs of design size or smaller this design satisfies GSA Level 3A in that it will fracture safely This software can be used to design blast resistant glazing fabricated with laminated glass subject to the following conditions 1 The glass is free of edge and surface damage 2 The blast resistant glazing assembly is continuously supported along all four edges 3 The software user has the responsibility of selecting the correct procedures for the required application from the software 4 Th
18. racks and fragments enter the space and land on the floor no further than 3 3 ft 1 0 m from the window Comments Inthe event a blast occurs of design size or smaller this design satisfies ASTM F1642 requirements for minimal hazard Inthe event a blast occurs of design size or smaller this design satisfies the requirements for a medium level of protection as defined in UFC 4 010 01 This design exceeds the limitations of ASTM E1300 04 Figure 5 5 Comment Section Within ASTM E 1300 If the load resistance of a blast resistant glazing falls beyond the limits of ASTM E 1300 the software only displays the equivalent 3 second design load and does not provide any other results The comment block shown in Figure 5 6 states that for the particular design additional design considerations are required Comments For these rectangular dimensions and blast details additional design considerations are required Figure 5 6 Comment Section Beyond ASTM E 1300 02 35 5 6 Closing the Design Results Window To close the design results window press the Close button on the bottom of the window or press the X button located on the top right hand corner of the Design Results window To recalculate the results follow the instruction in Section 5 1 of this document 36
19. s not fully tempered Blast Resistant Glazing Design 2007 displays the equivalent 3 second duration design loading the approximate maximum air blast pressure the nominal glass thickness for a single laminated glass lite or the nominal thicknesses for the lites that comprise the insulating glass unit required to resist the 3 second duration equivalent design loading according to ASTM E1300 after it completes the blast resistant glazing design calculation Blast Resistant Glazing Design 2007 always uses lites having equal nominal thicknesses in insulating glass units The program also displays the recommended size of the structural sealant bead to attach the blast resistant glazing to the window frame and the loads required to design the window frame members and to connect the window frame to the building Blast Resistant Glazing Design 2007 prints a blast resistant glazing report with the design load details the project details the glazing information the glass construction design load details and the framing and attachment requirements and loads CHAPTER Il Getting Started 2 1 2 2 Opening Blast Resistant Glazing Design 2007 Blast Resistant Glazing Design 2007 opens in three ways 1 The user can follow the path Start All Programs Standards Design Group Inc Blast Resistant Glazing Design 2007 2 the user can double click on a program file with the extension brd or 3 if the user creates a program shortcu
20. t Save Project Width ary Figure 2 8 Save Project As 14 2 6 1 Save Project If the project has not been previously saved the program brings up the Save As window as Figure 2 9 shows Type in a file name to the left of the Save button and press the Save button to save the current project If the project has been previously saved the program automatically writes the data for the current project to the previously saved file re Save As Save in E Blast Projects sl fl ce E la Example Design brd My Recent Documents Desktop My Documents 98 My Computer File name Example Design Abrd x di Mu Network Save as type BRGD2007 Design brd X Cancel Places Figure 2 9 Save As Window 2 6 2 Save As Pressing File gt Save Project As always brings up the Save As window shown in Figure 2 9 This allows the renaming of the current project or the saving of a new project Follow the steps in Section 2 4 of the document to save a file using the Save As command 15 2 7 System of Units Blast Resistant Glazing Design 2007 uses both US and SI units The program allows the user to toggle between the US and SI systems of units automatically updating all data in the current design To change the system of units click on the path Tools gt System of Units as Figure 2 10 shows Blast Resistant Glazing Design 2007 a
21. t on the desktop the user can open the program by double clicking on this shortcut Disclaimer and Limitations When the program opens the Disclaimer and Limitations window appears as shown in Figure 2 1 Before continuing the user must read and understand the disclaimer and the limitations of the software After reading the program limitations click on the I have read and understand the limitations of this software check box after reading and understanding the limitations of Blast Resistant Glazing Design 2007 Press the Ok button to continue isc er an mitations Please read the following disclaimer and limitations of this software Procedures followed in determining the load resistance of this window glass are in accordance with ASTM E1300 04 When the load resistance of a window falls beyond the limits of ASTM E 1300 04 the software will provide a statement to that effect Procedures followed in determining the equivalent 3 sec blast design load are in accordance with ASTM F 2248 Standard Practice to Specify an Equivalent 3 second Duration Design Loading for Blast Resistant Glazing Fabricated with Laminated Glass Upon the release of the final draft of this standard this software program will be updated to comply with any changes that might be made In the event a blast occurs of design size or smaller this design satisfies GSA Level 34 in that it will fracture safely This software can be used to desig
22. unit The air space thickness consists of the distance between the glass lites in the insulating glass in inches mm The program uses a default value 0 5 in 12 7 mm for the air space The user can change this value 28 4 5 2 4 Other Definitions For other definitions related to glass and glazing refer to ASTM E 1300 or ASTM C 1048 29 Chapter V Design Results 5 1 Access To access the Design window click the Calculate button on the Design Input window shown in Figure 5 1 This calculates the nominal thickness es of the blast resistant glazing the recommended size of the structural sealant bead and the uniformly distributed loads required to design the window glass frame and attach it to the structure amp Design Results m o Design Load Details Equivilant 3 sec Design Load N Load Resistance 124 psf Approximate Maximum Air Blast Pressure N A Glazing Design Single Lite Nominal Thickness 1 4 in Minimum Nominal P B Thickness 0 030 in Framing and Attachment Requirements The blast resistant design requires wet glazing in frame with a 1 4 in square bead The window glass frame must resist a 247 psf uniformly distributed static design load acting over the window surface area Comments Inthe event a blast occurs of design size or smaller this design satisfies ASTM F1642 requirements for minimal hazard Inthe event a blast occurs of design size or smaller this design s
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