多维地震作用下大跨度连续刚构桥动力响应研究  

Study on dynamic response of a long-span continuous rigid frame bridge under multi-dimensional earthquake

作　　者：坎彬 Kan Bin(Broadvision Engineering Consultants Co.,Ltd.,Kunming 650041,China)

机构地区：[1]云南省交通规划设计研究院有限公司,云南昆明650041

出　　处：《山西建筑》2022年第20期164-167,共4页Shanxi Architecture

摘　　要：为了探究多维地震作用下大跨度连续刚构桥动力响应问题,首先结合场地条件,得到目标反映谱与人工地震时程波,其次建立某超大跨度连续刚构桥有限元模型,并得到反映该桥固有属性的结构自振特性;最后进行该大跨度连续刚构桥地震响应分析。研究表明:在横向+竖向反应谱地震作用下的位移和内力值较大,这是因为横向地震容易激发桥梁结构的横向振型,其位移和弯矩最大值分别为0.381 m和6.34×10^(5) kN·m;三个时程工况下的位移值和内力值相差不大,这是因为三个时程工况均为三向地震激励,且三条水平波PGA相差不大;三个时程工况下最大弯矩和轴力分别发生在矮墩承台底和墩顶附近主梁截面,在地震设计时,要适当加强该位置的抗力设计。In order to explore the dynamic response of long-span continuous rigid frame bridge under multi-dimensional earthquake,firstly,combined with the site conditions,the target response spectrum and artificial earthquake time history wave are obtained.Secondly,the finite element model of a super long-span continuous rigid frame bridge is established,and the structural natural vibration characteristics reflecting the inherent properties of the bridge are obtained;finally,the seismic response of the long-span continuous rigid frame bridge is analyzed.The research shows that the displacement and internal force under the action of transverse+vertical response spectrum earthquake are large,because the transverse earthquake is easy to excite the transverse vibration mode of the bridge structure,and the maximum displacement and bending moment are 0.381 m and 6.34×10^(5) kN·m respectively;there is little difference between the displacement value and internal force value under the three time history conditions,because the three time history conditions are three-way seismic excitation,and the three horizontal waves PGA have little difference.Under the three time history working conditions,the maximum bending moment and axial force occur in the main beam section near the bottom of the low pier cap and the pier top respectively.In the seismic design,the resistance design at this position should be appropriately strengthened.

关 键 词：桥梁工程 多维地震 连续刚构桥 动力响应 

分 类 号：TU393.3[建筑科学—结构工程]