【摘要】 为研究波形钢腹板连续刚构桥地震响应特性,分别对主跨160 m的PC及波形钢腹板连续刚构桥进行时程响应分析。采用MIDAS建立2种连续刚构桥模型,分析模型基本动力特性和在3种地震波作用下的地震响应。分析结果表明:波形钢腹板连续刚构桥振型贡献率无明显集中现象;地震波作用下,桥墩及主梁产生的轴力和绕横桥向弯矩较PC连续刚构桥大,绕顺桥向弯矩较PC连续刚构桥小;主梁跨中节点位移顺、横桥向均较PC连续刚构桥大;加速度衰减速度,顺桥向较PC连续刚构桥小,横桥向较PC连续刚构桥大;在主梁截面设计中,仍以静力计算结果控制。更多还原

【Abstract】 To investigate the seismic response characteristic of corrugated steel web(CSW) continuous rigid-frame bridge,the time-history response analysis of prestressed concrete(PC) and CSW continuous rigid-frame bridges with main spans 160 m was respectively made.The MIDAS was used to set up the models for the two types of the bridges,the basic dynamic characteristics and the seismic responses of the models under the action of 3 types of seismic waves were analyzed.The results of the analysis reveal that the contribution ratio of vibration modes of the CSW bridge does not exhibit significant concentration.Under the action of the seismic waves,the axial forces produced in the piers and main girder of the CSW bridge and the bending moment around the transverse direction of the bridge are greater than those of the PC bridge,however,the bending moment around the longitudinal direction is less than that of the PC bridge.The displacement of the midspan node of the main girder of the CSW bridge in both the longitudinal and transverse directions is greater than that of the PC bridge.The decaying speed of acceleration of the CSW bridge in the longitudinal direction is less than that of the PC bridge while in the transverse direction,is greater than that of the PC bridge.In the design of the cross section of the main girder,the results of static calculation should be still taken as the control.更多还原