火灾下四种不同边界双向板的极限承载力计算  

CALCULATION OF ULTIMATE BEARING CAPACITY OF FOUR KINDS OF TWO-WAY SLABS WITH DIFFERENT BOUNDARIES UNDER FIRE

作　　者：朱三凡 董毓利[1] 张大山[1] 段进涛 ZHU San-fan;DONG Yu-li;ZHANG Da-shan;DUAN Jin-tao(College of Civil Engineering,Huaqiao University,Xiamen,Fujian 361021,China;JianYan Test Group Co.,LTD,Xiamen,Fujian 361004,China)

机构地区：[1]华侨大学土木工程学院,福建厦门361021 [2]健研检测集团有限公司,福建厦门361004

出　　处：《工程力学》2022年第3期104-114,共11页Engineering Mechanics

基　　金：国家自然科学基金项目(51778250,51978293)。

摘　　要：为进一步了解不同边界条件下双向板的极限承载力计算方法,该文在已有研究的基础上针对四种不同边界双向板进行了研究。基于塑性铰线理论板块平衡法和能量法,给出了火灾作用下三边简支一边固支、三边固支一边简支、两长边固支两短边简支、两长边简支两短边固支四种不同边界钢筋混凝土双向板极限承载力的计算公式。该公式考虑了大挠度下的薄膜效应影响,计算结果与试验结果有较高的一致性,两种方法计算结果存在2%左右的偏差。在整合其他边界双向板计算公式的基础上,提出了火灾下各种边界双向板极限承载力计算的通用公式,能为工程设计和下一步研究提供参考。To further understand the calculation method of ultimate bearing capacity of two-way slabs under different boundary conditions,four kinds of two-way slabs with different boundaries are studied by the grounds of existing research.Based on the plate balance method and energy method,an ultimate bearing capacity calculation formula for reinforced concrete two-way slabs with four different boundaries under fire is developed,which is simply supported on three sides and clamped on one side,simply supported on one side and clamped on other three sides,simply supported on two long sides and clamped on two short sides,and simply supported on two long sides and clamped on two long sides.The influence of membrane effect under a large deflection is considered in the formula,the calculated results and the experimental results have a high consistency.The calculated results of the two methods have a deviation of about 2%.Based on integrating other formulas,the general formulas for calculating the ultimate bearing capacity of various boundary two-way slabs under fire are proposed,which can provide a reference for engineering design and further research.

关 键 词：双向板 极限承载力 板块平衡法 能量法 塑性铰线理论 

分 类 号：TU352.5[建筑科学—结构工程] TU375.2