多跨长联连续箱梁桥非线性抗震分析

Nonlinear Seismic Resistance Analysis of Long Multi-span Continuous Box Girder Bridge

多跨长联连续箱梁桥以其受力合理、施工简便和造价经济等优点,在我国桥梁中应用极为广泛。由于其跨数多、单联长度长,地震响应较一般连续梁桥明显,如何采取正确的抗震计算方法,在保证计算结果精确性的同时提高工作效率,是桥梁设计工作者的一个重要工作内容。以一座9×80m的连续箱梁桥为分析对象,利用反应谱法和时程分析法进行抗震分析,探讨该桥型的非线性地震响应和高效的抗震计算方法,为同类型桥梁提供借鉴和参考。

Multi-span continuous box girder bridges have been widely used in bridges with many advantages,such as good performance,construction convenient and economy.Because a number of spans and long length for each span,the seismic response of long multi-span continuous-girder bridges is more obvious than the general continuous-beam bridges.How to choose a rational seismic calculation method is a vital important work for bridge designers.Taking a multi-span continuous box girder bridge with nine-span of 80m as prototype,based on response spectrum and time-history analysis method,nonlinear seismic response and efficient seismic calculation method of this bridge were carried out.