X34 for the purpose of this guide restraint in

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X3.4 For the purpose of this guide, restraint in buildings is defined as follows: "Floor and roof assemblies and individual beams in buildings shall be considered restrained when the surrounding or supporting structure is capable of resisting substantial thermal expansion throughout the range of anticipated elevated tem- peratures. Construction not complying with this definition are assumed to be free to rotate and expand and shall therefore be considered as unrestrained." X3.5 This definition requires the exercise of engineering judgment to determine what constitutes restraint to "sub- stantial thermal expansion.'' Restraint may be provided by the lateral stiffness of supports for floor and roof assemblies and intermediate beams forming part of the assembly. In order to develop restraint, connec- tions must adequately transfer thermal thrusts to such supports. The rigidity of adjoining panels or struc- tures should be considered in assessing the capability of a structure to resist thermal expansion. Continuity, such as that occurring in beams acting continuously over more than two supports, will induce rotational restraint which will usually add to the fire resistance of structural members. X3.6 In Table X3.1 only the common types of constructions are listed. Having these examples in mind as well as the philosophy expressed in the preamble, the user should be able to rationalize the less common types of construction.
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PAGE 71 SYSTEMS I. Wall bearing: Single span and simply supported end spans of multiple bays: A (1) Open-web steel joists or steel beams, supporting concrete slab, precast units, or metal decking unrestrained (2) Concrete slabs, precast units, or metal decking unrestrained unrestrained Interior spans of multiple bays: (1) Open-web steel joists, steel beams or metal decking, supporting continuous concrete slab restrained (2) Open-web steel joists or steel beams, supporting precast units or metal decking unrestrained (3) Cast-in-place concrete slab systems restrained (4) Precast concrete where the potential thermal expansion is resisted by adjacent construction B restrained II. Steel framing: (1) Steel beams welded, riveted, or bolted to the framing members restrained (2) All types of cast-in-place floor and roof systems (such as beam-and- slabs, flat slabs, pan joists, and waffle slabs) where the floor or roof system is secured to the framing members restrained (3) All types of prefabricated floor or roof systems where the structural members are secured to the framing members and the potential thermal expansion of the floor or roof system is resisted by the framing system or the adjoining floor or roof construction B restrained III. Concrete framing: (1) Beams securely fastened to the framing members restrained (2) All types of cast-in-place floor or roof systems (such as beam-and-slabs, flat slabs, pan joists, and waffle slabs) where the floor system is cast with the framing members restrained (3) Interior and exterior spans of precast systems with cast-in-place joints
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  • Structural steel

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