索杆肋梁组合楼盖人致振动有限元研究  

FEM Research on Human-Induced Vibration of Cable-Supported Ribbed Beam Composite Floor

作　　者：乔文涛[1] 安琦[2] 杨洋[3] Qiao Wentao;An Qi;Yang Yang(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China;School of Transportation Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]石家庄铁道大学土木工程学院,石家庄050043 [2]青岛理工大学土木工程学院,青岛266033 [3]北京交通大学交通运输学院,北京100044

出　　处：《天津大学学报（自然科学与工程技术版）》2017年第B07期109-114,共6页Journal of Tianjin University：Science and Technology

基　　金：国家自然科学基金资助项目(51208317);河北省自然科学基金资助项目(E2016210052);河北省大型基础设施防灾减灾协同创新中心资助项目

摘　　要：索杆肋梁组合楼盖是一种采用拉索通过撑杆支承混凝土肋梁的新型预应力组合楼盖结构,此种结构具有较好的力学性能,可以采用较少材料实现较大跨度.同时,这也使得结构的整体刚度相对较小,在人行荷载激励下,楼盖可能会产生较大的振动.本文采用有限元分析工具MIDAS/GEN,建立了一榀索杆肋梁组合楼盖结构计算模型,研究了结构的自振特性;随后,研究了踏步荷载下结构的加速度响应;最后,对垂度、拉索直径、撑杆直径以及混凝土肋梁梁高这4个参数对人致振动响应的影响规律进行了研究.结果表明,混凝土肋梁梁高和拉索直径对结构加速度的影响最大,其次是撑杆直径,垂度影响最小.Cable-supported ribbed beam composite floor is a pre-stressed composite floor structure with the cables and rods supporting the concrete ribbed beams.This structure has good mechanical properties,which can achieve a relatively large span by using less material.Meanwhile,the overall stiffness of the new structure is relatively small,resulting in greater vibration of the floor induced by the pedestrian load excitation.In this paper,based on a calculation model of a bay cable-supported ribbed beam composite floor built by the finite element analysis software MIDAS/GEN,the natural vibration characteristics are studied firstly.Then,the acceleration response of the structure under the step load is studied as well.Finally,the influence on the human-induced vibration response,under four parameters including cable sag,cable diameter,rod diameter and beam height,is studied.The research results show that the beam height and the cable diameter have significant influence on the structural acceleration,the influence of the supporting rod diameter is small and the influence of the sag is smaller.

关 键 词：索杆肋梁组合楼盖 人致振动 自振特性 

分 类 号：TU398.9[建筑科学—结构工程]