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为了研究火灾下压型钢板组合板的耐火性能,根据实际条件建立组合板的计算模型,采用解析法推导了端支座约束刚度、截面刚度以及内力的计算公式,得出组合板在重力荷载、温差及升温作用下的内力变化规律。分析表明:与受火时组合板的偏心受压刚度相比,次梁对板的水平约束刚度可视为零;形成塑性铰前,温差作用引起的支座负弯矩很大,导致板全跨的弯矩值为负值;支座形成塑性铰后,板跨中将出现正弯矩。最后,提出了一些关于组合板耐火性能的建议供研究者和设计者参考。
In order to study the fire resistance of the pressed steel plate under fire, the calculation model of the composite plate is established according to the actual conditions, and the formulas of constraint stiffness, section stiffness and internal force of the end support are derived by analytic method, Internal temperature variation under temperature difference and temperature increase. The analysis shows that compared with the eccentric compression stiffness of the composite plate subjected to fire, the horizontal restraint stiffness of the secondary beam to the plate can be regarded as zero. Before forming the plastic hinge, the negative bearing moment caused by the temperature difference is very large, The cross moment value is negative. After forming the plastic hinge, the positive moment will appear in the plate span. Finally, some suggestions about the fire resistance of the composite board are put forward for researchers and designers.