摘要
为研究分布式连接全装配RC楼盖(DCPCD)的动力特性,进行了4个足尺DCPCD试件和一个整浇板试件在两端简支条件下的锤击法试验和数值模拟分析,研究了DCPCD的板缝构造、连接件锚固方式、边界约束条件和自重等对楼盖竖向动力特性的影响。试验结果表明:与整浇板相比DCPCD横板向刚度较小,自振频率较低,板缝构造是影响楼盖刚度和振动特性的主要因素;连接件数量越多,楼盖的刚度和自振频率越高;板缝数量越多,楼盖的刚度和自振频率越低。所提出的有限元模拟方法可以准确模拟DCPCD的动力特性;连接件锚固强度越高,楼盖的刚度和自振频率越高;两端嵌固约束下的楼盖基频比两端简支约束下提高了70%;随着楼盖自重的增加,自振频率显著降低。研究结果可为四边约束下楼盖的竖向振动特性与人致激励响应研究提供参考和依据。
In order to study the dynamic characteristics of the discretely connected precast RC diaphragms(DCPCD),four full-scale DCPCD test pieces and one full cast plate test piece are subjected to hammer test and numerical simulation analysis under simple support conditions,and the effects of DCPCD joint structure,anchoring method of joints,boundary constraints and dead weight on the vertical dynamic characteristics of the floor are studied.The results show that compared with the whole cast plate,the transverse stiffness of DCPCD is smaller and the natural frequency is lower,slab structure is the main factor affecting the stiffness and vibration characteristics of the floor;the more the number of connectors,the higher the stiffness and natural frequency of the floor;the more the number of slab joints,the lower the stiffness and vibration frequency of the floor.The proposed finite element simulation method can accurately simulate the dynamic characteristics of DCPCD;the higher the anchoring strength of the connector,the higher the stiffness and the natural frequency of the floor.The fundamental frequency of the floor under the restraint at both ends is increased by 70%compared with the restraint at both ends;With the increase of the floor’s own weight in the orthogonal slab laying direction,the natural frequency decreases significantly.The research results can provide a reference and basis for the study of the vertical vibration characteristics and human-induced excitation response of the floor under four-sided constraints.
作者
庞瑞
张天鹏
王文康
张岚波
徐科
Pang Rui;Zhang Tianpeng;Wang Wenkang;Zhang Lanbo;Xu Ke(College of Civil Engineering and Architecture,Henan University of Technology,Zhengzhou 450001,China)
出处
《建筑科学》
CSCD
北大核心
2021年第3期70-77,144,共9页
Building Science
基金
国家自然科学基金(51778214)
河南省高等学校重点科研项目(17A560003)
河南省属高校基本科研业务专项基金(2017RCJH04)。
关键词
分布式连接
全装配RC楼盖
模态试验
动力特性
参数分析
discrete connection
untopped precast RC floor diaphragm
modal test
dynamic property
parametric analysis
