基于环境振动的既有预应力连续刚构桥地震响应分析

建立了基于环境振动的既有预应力混凝土连续刚构桥的地震响应分析方法。该方法主要包括现场环境振动实验与系统参数识别、桥梁有限元建模、基于动力的有限元模型参数修正、桥梁地震波选择以及桥梁动力时程反应分析等步骤。利用该方法进行了泉州后渚大桥———五跨预应力混凝土连续刚构桥的动力时程反应分析,结果表明:必须考虑竖向地震动和行波效应的影响,最不利截面位于墩梁结合面和墩底。此类分析对于桥梁养护与维修、长期健康监测具有重要的意义。

Ambient Vibration-based Seismic Response Analysis of an Existing Prestressed Continuous Rigid-framed Bridge

In this paper, an ambient vibration-based seismic response analysis procedure of an existing large-span pretressed concrete continuous rigid-framed bridge is proposed. The procedure includes field ambient vibration testing, finite element (FE) modeling, parameter calibration of FE model, selection of earthquake ground motion, and dynamic time-history analysis of the bridge, et al.. Based on this procedure, the seismic response analysis of a 5-span prestressed concrete continuous rigid-framed bridge, namely the Quanzhou Houzhu Bridge, was conducted. It is demonstrated that the vertical earthquake ground motion and the traveling wave effects should be considered during the seismic response analysis of the continuous rigid-framed bridge. The results also reveal that the largest seismic response inner-forces occur at the bottom of the piers and the connection between the box-girder and the pier. This kind of analysis can serve for the long-term health monitoring, maintenance and rehabilitation and it has great importance.