ASTM E997-15(R2021) pdf free download

ASTM E997-15(R2021) pdf free download.Standard Test Method for Evaluating Glass Breakage Probability Under the Influence of Uniform Static Loads by Proof Load Testing
1. Scope
1.1 This proof load test method is a procedure to determine, with a 90 % confidence level, if the probability of breakage under design loads for a given population ofglass specimens is less than a selected value. It is not intended to be a design standard for determining the load resistance of glass. Practice E1300 shall be used for this purpose. 1.2 This test method describes apparatus and procedures to select and apply a proof load to glass specimens, to determine the number of glass specimens to be tested, and to evaluate statistically the probability of breakage. This test method may be conducted using the standard test frame specified herein or a test frame of the user’s design. 1.3 Proper use of this test method requires a knowledge of the principles of pressure measurement and an understanding of recommended glazing practices. 1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Section 7. 1.6 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions: 3.1.1 For definitions of general terms related to building construction used in this test method refer to Terminology E631. 3.2 Definitions ofTerms Specific to This Standard: 3.2.1 coeffıcient ofvariation, v—ratio of the standard devia- tion of the breakage load to the mean breakage load. 3.2.2 design load, n—the specified uniform load and load duration. 3.2.3 glass specimen, n—the glass to be tested, for example, a single pane, an insulating glass unit, laminated glass, etc. (does not include test frame). 3.2.4 glass specimen breakage, n—the fracture or cracking of any glass component of a glass specimen. 3.2.5 negative load, n—an outward-acting load that results in the indoor side of a glass specimen being the high-pressure side. 3.2.6 positive load, n—an inward-acting load that results in the outdoor side of a glass specimen being the high-pressure side. 3.2.7 probability ofbreakage, n—the probability that a glass specimen will break when tested at a given load. 3.2.8 proof load, n—a uniform load at which glass speci- mens shall be tested. 3.2.9 proof load factor, a, n—the constant which, when multiplied by the design load, determines the proof load. 3.2.10 specifying authority, n—professional(s) responsible for determining and furnishing information required to perform the test.
4. Summary of Test Method
4.1 This test method consists of individually glazing glass specimens in a test frame that is mounted into or against one face of a test chamber and supplying air to, or exhausting air from, the test chamber so that each glass specimen is exposed to a proof load. Load-time records shall be kept for each glass specimen. Each glass specimen break shall be recorded. 4.2 After testing the required number of glass specimens, it is determined, with a 90 % confidence level, if the probability of breakage under design loads for the given population of glass specimens is less than a specified allowable probability of breakage.
5. Significance and Use
5.1 Glass specimens to be tested shall be mounted in a standard test frame with four sides supported, or in a test frame designed to represent specific glazing conditions. 5.2 Loads on glass in windows, curtain walls, and doors may vary greatly in magnitude, direction, and duration. Any design load (wind, snow, etc.) that can reasonably be applied to the test specimens or transformed into an equivalent uniform design load can be considered. Load transformation techniques are addressed in the literature (1, 2, 3). 3 5.3 The strength of glass varies with many different factors including surface condition, load duration, geometry, relative humidity, and temperature (4). A thorough understanding of those strength variations is required to interpret results of this test method.