火灾下两种不同边界钢筋混凝土双向板的振动性能分析  

Vibration Performance Analysis of Reinforced Concrete Two-Way Slab With Two Different Boundaries Under Fire

作　　者：朱三凡 董毓利[1] 段进涛 叶森贵 ZHU Sanfan;DONG Yuli;DUAN Jintao;YE Sengui(College of Civil Engineering,Huaqiao University,Xiamen 361021,China;JianYan Test Group Coporation Limited,Xiamen 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：《华侨大学学报（自然科学版）》2021年第3期289-297,共9页Journal of Huaqiao University(Natural Science)

基　　金：国家自然科学基金资助项目(51778250,51978293)。

摘　　要：开展火灾下三边简支一边固支、两短边固支两长边简支两种边界条件下的足尺混凝土板的火灾试验.首先,在双向板表面布置拾振器,对火灾下两种双向板的振动性能进行研究;然后,通过回归分析,提出火灾下双向板的竖向一阶自激励频率与板中竖向位移的关系式,并基于频率差值进行楼板耐火极限预警;最后,采用ABAQUS软件对三边简支一边固支双向板受火过程中的频率差值进行模拟.结果表明:两种边界条件的双向板在火灾作用下的竖向一阶自激励频率均明显降低;频率差值板中竖向位移的计算值曲线与实测值曲线基本一致.The fire tests of full scale concrete slabs with simple support on three sides fixed support on one side and fixed support on two short sides simple support on two long sides were carried out.Firstly,the vibration performance of two kinds of two-way slabs under fire was studied by placing vibration pick up on the surface of two-way slab.Then,through regression analysis,the relation formula between the vertical first-order self-exciting frequency and the vertical displacement in slab under fire was proposed,and the fire resistance limit of floor was predicted based on the frequency difference.Finally,ABAQUS software was used to simulate the frequency difference in the fire process of two way slab with simple support on three sides fixed support on one side.The results show that the vertical first-order self-exciting frequencies of two way slab with two kinds of boundaries reduce obviously under the action of fire;the calculation value curves of frequency difference and the vertical displacement in slab are basically consistent with the measured value curves.

关 键 词：钢筋混凝土双向板 足尺试验 振动性能 火灾试验 

分 类 号：TU398.9[建筑科学—结构工程] TU352.5