Standard Practice for Determining Load Resistance of Glass in Buildings1 This standard is issued under the fixed designation E ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Scope only. For conversion of quantities in various systems of 1. It is the buildings for which the specified design loads consist of wind responsibility of the user of this standard to establish appro- load, snow load and self-weight with a total combined magni- priate safety and health practices and determine the applica- tude less than or equal to 10 kPa psf. This practice shall bility of regulatory limitations prior to use.
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Standard Practice for Determining Load Resistance of Glass in Buildings1 This standard is issued under the fixed designation E ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Scope only. For conversion of quantities in various systems of 1. It is the buildings for which the specified design loads consist of wind responsibility of the user of this standard to establish appro- load, snow load and self-weight with a total combined magni- priate safety and health practices and determine the applica- tude less than or equal to 10 kPa psf.
This practice shall bility of regulatory limitations prior to use. Referenced Documents balustrades, glass floor panels, aquariums, structural glass members, and glass shelves. HS, Kind FT Coated and Uncoated Glass This practice assumes that 1 the supported glass edges for C Specification for Laminated Architectural Flat Glass two, three, and four-sided support conditions are simply D Practice for Plastics: Dynamic Mechanical Proper- supported and free to slip in plane; 2 glass supported on two ties: Determination and Report of Procedures sides acts as a simply supported beam; and 3 glass supported E Terminology of Building Constructions on one side acts as a cantilever.
Terminology glass with surface and edge treatments that alter the glass strength. The final thickness in this practice. Appendix X1 short dimension of the glass is always equal to or greater than and Appendix X2 provide additional procedures to determine 1.
For glass simply supported on three sides, the ratio of the maximum lateral deflection for glass simply supported on four length of one of the supported edges perpendicular to the free sides. Appendix X3 presents a procedure to compute approxi- edge, to the length of the free edge, is equal to or greater than mate probability of breakage for annealed AN monolithic 0.
The values given in parentheses are for information decoration. Published July Last previous edition approved in as E — No further reproductions authorized. Lite No. The information in this practice applies only to polyvinyl butyral PVB interlayer or those interlayers that demonstrate equivalency according to Appendix X If the sum of all interlayer load given by the specifying authority. Nominal 3. Designation, mm in. E — 09a equal or different thicknesses and types including the layered NOTE 1—This practice does not address aesthetic issues caused by glass behavior of LG under long duration loads , in a sealed IG unit.
These factors include but are not limited the IG unit, based on the resistance to breakage of one specific to: thermal stresses, spontaneous breakage of tempered glass, lite only. In addition, considerations set forth in lites or plies that would break at the first occurrence of a building codes along with criteria presented in safety glazing specified load and duration, typically expressed in lites per standards and site specific concerns may control the ultimate Procedure having jurisdiction and considering appropriate site specific 6.
Annex A1 the upper charts of Figs A1. Summary of Practice 6. If the thickness, size, and design load. If the maximum lateral LR is less than the specified load, then other glass types and deflection falls outside the charts in Annex A1, then use the thicknesses may be evaluated to find a suitable assembly procedures outlined in Appendix X1 and Appendix X2. Significance and Use of unsupported edge deflection from the appropriate chart in 5.
The specified design load shall A1. Along One Edge Cantilever :. E — 09a 6. If the maximum lateral deflection falls outside 6.
Appendix X1 and Appendix X2. Load: 6. If the LR is greater than or equal to from 6. A larger combined dimension may result in excessive sealant stress and glass glass type s and thickness es , the GTF s , the LS factors for stresses due to temperature and altitude conditions. IG , the factored LR and the approximate lateral deflection, the glass edge support conditions, and 6. Precision and Bias inward facing lite of the IG unit.
Complete glass type and load duration. Glass may be manufactured thicker than those minimums. Not A1. The accounting for this fact in the NFL charts makes the charts NFL charts were developed using a failure prediction model conservative from a design standpoint. The model allows the probability of breakage of any lite or ply to be specified in terms of two surface flaw A1.
No recommendations are made in this practice regarding accept- A1. The lower charts of Fig. In development of the NFL charts presented in upper charts of Fig. These flaw param- A1.
The selection of the surface flaw parameters was based corresponding to the long dimension of the glass and project a upon the best available data and engineering judgment. If the vertical line.
This method does not corresponding to the short dimension of the glass and project a apply to glass that has been subjected to severe surface horizontal line until it intersects the vertical line of A1.
E — 09a. Glass with Four Sides Simply Supported. Glass with Three Sides Simply Supported. Convert kPa to inch-pound and the calculation of the LR. Example 4 illustrates the units by multiplying 2. The A2. Determine if the skylight will support a 6. NFL is thus found to be 2. NOTE A2. E — 09a subjected to wind load. Will this window glass support a 1. This leaves a short term duration LR for the IG unit as follows: of: 2.
The total load divided by the LS factor for either tion of a monolithic rectangular glass plate note the special lite gives the approximate load carried by that lite for deflection procedures for laminated and IG subjected to a uniform lateral calculations. In development of this procedure, it was assumed that all four edges of the glass are simply supported and free to slip in X1. This boundary condition has been shown used to calculate the relationship between the nondimensional to be typical of many glass installations 1, 3, 4.
The resulting relationship is depicted in the deflection chart loads using the LG thickness designation. Because the information presented in X1.
The deflection is calcu- the true glass thickness, t, as follows:. The actual the vertical axis of the deflection chart. When the actual thickness of the glass is 5. The corresponding nondimensional maximum lateral be taken to be Pound Units—Determine the maximum lateral deflection as- X1. The actual thickness of the glass is 0. Locate measurement. Use this value to calculate the nondimensional load for that lite using Eq X1. The corresponding nondimensional maximum lateral glass thickness.
From Eq X2. The glass deflection is: actual thickness of the glass is 5. This is accomplished using the following evaluate the probability of breakage for an AN glass plate are approximate relationship: listed in X3. Locate this point on the horizontal axis on Fig. The use of Eq X3. E — 09a X3. Locate this point on the horizontal axis of Fig. The value of J thus determined is approximately Therefore, the use of Eq X3. This does not imply that a probability of 0.
The actual thickness of the glass plate is assumed to be 0. Locate this point on the horizontal associated with a by by 6-mm rectangular glass axis of Fig. The actual intersects the horizontal line of X3. The value of J thus determined is X3. Rigorous engineering analysis that p 5 0.
Therefore the AN lite probability factor becomes: X4. As the area of glass under p 5 1. For a single monolithic lite with two surfaces the IG type factor because the lites of an IG unit are seldom equally at risk, parallel. This is due to sealed air space pressure differences p 5 1. Either Lite assumed to be proportional to the stiffness of the lites, that is, No.
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