火灾下两跨楼板升温及降温过程挠度计算  

DEFLECTION CALCULATION OF TWO-SPAN SLABS DURING HEATING AND COOLING PHASES IN FIRE DISASTER

作　　者：宋政文 郭文轩 张亚军 SONG Zhengwen;GUO Wenxuan;ZHANG Yajun(Yichun Luming Mining Co.,Ltd.,Heilongjing Yichun 152500,China;School of Civil Engineering,Central South University,Changsha 410083,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Jiangsu Xuzhou 221008,China)

机构地区：[1]伊春鹿鸣矿业有限公司,黑龙江伊春152500 [2]中南大学土木工程学院,长沙410083 [3]中国矿业大学力学与土木工程学院,江苏徐州221008

出　　处：《低温建筑技术》2023年第8期65-68,共4页Low Temperature Architecture Technology

摘　　要：为计算火灾作用下多跨混凝土楼板挠度,文中基于板壳理论,结合降温阶段热弯矩方程,建立火灾作用下两跨钢筋混凝土楼板升温及降温全过程的挠度计算方法,对火灾作用下钢筋混凝土楼板升降温的时间-变形行为进行计算分析。结果表明升温阶段采用楼盖截面温度梯度进行计算,降温阶段采用楼盖截面平均温度进行分析,结果较好;与试验结果相比,文中方法计算值与试验值变形趋势较为一致。可以为火灾作用后楼板的刚度和加固补强措施提供参考。The deflection calculation method of two-span concrete slabs during heating and cooling phases in fire is proposed.The method is based on the theory of slab and shell,which combines with the hot bending moment equation in cooling phase.The time-deformation behavior of heating and cooling phases of reinforced concrete floor slabs under fire is analyzed.The calculation results are good when the temperature gradient of the roof section is used for calculation in the heating stage,and the average temperature of the building section is used for analysis in the cooling stage.Compared with the experimental results,the calculated values of the proposed method are consistent with the deformation trend of the experimental values,which may provide the reference for the stiffness of the floor and reinforcement measures after fire disaster.

关 键 词：两跨混凝土楼板 板壳理论 升温及降温全过程 

分 类 号：TU311.4[建筑科学—结构工程]