移动荷载列作用下多层梁系统的动力响应分析  

Dynamic response analysis of multi-layer beam system under successive moving loads

作　　者：周旺保[1] 吴凌旭 张云泰 冯玉林 ZHOU Wangbao;WU Lingxu;ZHANG Yuntai;FENG Yulin(School of Civil Engineering,Central South University,Changsha 410075,China;School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]华东交通大学土木建筑学院,江西南昌330013

出　　处：《华中科技大学学报（自然科学版）》2021年第5期62-66,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51778630,52078487,U1934207);湖南创新型省份建设专项资助项目(2019RS3009);中南大学创新驱动资金资助项目(502501006)。

摘　　要：为研究多层梁系统在任意移动荷载列作用下的动力响应,基于有限傅里叶变换,提出一种求解移动荷载列作用下多层梁系统动力响应的解析计算方法.利用本研究的解析计算方法分析了梁的抗弯刚度、层间阻尼及层间刚度对一跨长32 m的梁-轨系统动力响应的影响,分析结果表明:改变轨道抗弯刚度、层间刚度或层间阻尼对主梁跨中动力响应的影响可以忽略;随着轨道抗弯刚度、层间刚度或层间阻尼的增大,轨道的跨中动力响应都缓慢减小;随着主梁抗弯刚度的增大,轨道及主梁的跨中动力响应均显著减小.To study the dynamic response of a multi-layer beam system under arbitrary successive moving loads, based on the finite Fourier transform, an analytical calculation method for solving the dynamic response of a multi-layer beam system under successive moving loads was proposed.Effects of the bending stiffness of beams,interlayer damping and interlayer stiffness on the dynamic response of a beam-rail system with a span of 32 m were analyzed by using the proposed analytical calculation method.Analysis results show that the effect of changing the bending stiffness of the track,the interlayer stiffness or the interlayer damping on the mid-span dynamic response of the girder can be ignored;as the bending stiffness of the track, the interlayer stiffness or interlayer damping increase, the mid-span dynamic response of the track decreases slowly;as the bending stiffness of the girder increases,the mid-span dynamic response of the track and girder decrease significantly.

关 键 词：多层梁系统 移动荷载列 抗弯刚度 层间刚度 层间阻尼 动力响应 

分 类 号：U441.3[建筑科学—桥梁与隧道工程] U211[交通运输工程—道路与铁道工程]