钢-混凝土组合梁动力折减系数研究  

Dynamic reduction coefficients for a steel-concrete composite beam

作　　者：侯忠明[1,2] 夏禾[2] 王元清[1] 张彦玲[3] 

机构地区：[1]清华大学土木工程系,北京100084 [2]北京交通大学土木建筑工程学院,北京100044 [3]石家庄铁道大学土木工程学院,石家庄050043

出　　处：《振动与冲击》2015年第4期74-81,共8页Journal of Vibration and Shock

基　　金：国家重点基础研究计划973项目(2013CB036203);国家自然科学基金项目(51178025;51108281);中国博士后科学基金(2014M560088);河北省高等学校科学技术研究项目重点课题(ZD2014025)

摘　　要：考虑钢梁与混凝土板之间的滑移,对钢-混简支组合梁的基本动力方程进行了理论推导和分析。在此基础上,考虑到组合梁与普通梁的不同力学特性,提出了适于组合梁动力计算的"刚度折减系数"和"频率折减系数",并与《钢结构设计规范》(GB50017-2003)中的公式进行了比较分析,给出了动力刚度折减系数和频率折减系数表达式。结果表明,在组合梁的动力计算中,不能直接套用静力计算的公式来计算组合梁的等效刚度,否则会引起较大的误差。Considering the slip between steel girder and concrete slab, the fundamental governing motion equations of a simply-supported steel-concrete composite beam were deduced and analyzed. On the above basis, considering the different mechanical characteristics between the composite beam and a common one, the dynamic stiffness reduction coefficient and frequency reduction coefficient applicable for the dynamic calculation of the composite beam were proposed and compared with those in the Code for design of steel structures. Then, the expressions of the two coefficients were deduced. The study showed that the expressions for static calculation from the Code for design of steel structures are not applicable for the calculation of the dynamic equivalent stiffness of the composite beam, otherwise a larger error can be caused.

关 键 词：钢-混凝土组合梁 动力特性 刚度折减系数 频率折减系数 

分 类 号：U441.3[建筑科学—桥梁与隧道工程] U24[交通运输工程—道路与铁道工程]