For additional design requirements such as beam

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* For additional design requirements such as beam spacing, concrete strength, density, reinforcing and clear cover, minimum metal deck gage, maximum deck span, shear connector requirements, design stress limitations, etc. see the specific referenced assembly in the UL directory. Assembly Rating (hr) (hr) (hr) (hr) Type of Protection Type of Protection Column Types Column Types Gypsum Wallboard W Spray-applied Fire Resistive Material 1, 1-1/2, 2, 3, 4 Table 10 Column Assemblies
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SYSTEMS PAGE 70 Partial Extract of the Appendix to ASTM E119-00a: Standard Test Methods for Fire Tests of Building Construction and Materials X3. Guide for Determining Conditions of Restraint for Floor and Roof Assemblies and for Individual Beams One of the major changes in the new rating criteria was the establishment of restrained and unrestrained ratings. To help determine the appropriate rating to use in a particular building situation, the following Guide is presented. It is Appendix C from the Standard for Fire Tests of Building Construction and Materials, UL263. Paragraphs X3.1 through X3.5 provide general information with respect to the concept of restraint against thermal expansion of building elements as it relates to restrained and unrestrained rat- ings. Table X3.1 gives examples of restrained and unrestrained conditions for certain common construc- tion types. It should be understood that the information provided in Table X3.1 is to be used as a guide and that the concept of restraint against thermal expansion addressed in paragraphs X3.2 through X3.5 should be carefully considered in assessing the condition of restraint in building structures. X3.1 The revisions adopted in 1970 introduced the concept of fire endurance classifications based on two con- ditions of support: restrained and unrestrained. As a result, specimens can be fire tested in such a manner as to derive these two classifications. X3.2 A restrained condition in fire tests, as used in this test method, is one in which expansion at the supports of a load carrying element resulting from the effects of the fire is resisted by forces external to the element. An unrestrained condition is one in which the load carrying element is free to expand and rotate at its sup- ports. X3.3 This guide is based on knowledge currently available and recommends that all constructions be classified as either restrained or unrestrained. This classification will enable the architect, engineer, or building offi- cial to correlate the fire endurance classification, based on conditions of restraint, with the construction type under consideration. While it has been shown that certain conditions of restraint will improve fire endurance, methodologies for establishing the presence of sufficient restraint in actual constructions have not been standardized.
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  • Fall '19
  • Structural steel

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