应用反映谱法分析淳安南浦大桥抗震性能

钢管混凝土拱桥由于跨径较大,宽跨比较小,其失稳形态一般是面外半波失稳,其抗震稳定性一直以来是桥梁工程师所关注的问题。淳安南浦大桥为中承式钢管混凝土桁式拱桥,拱轴系数为1.167,大桥总设计长度330 m,净跨径308 m,净矢高60 m,宽跨比1/19.81。采用反应谱方法分析该桥抗震稳定性,分析结果表明该桥在地震荷载作用下的结构内力大于车辆荷载作用下的内力。

Application of reflection spectrum method to the analysis of aseimatic performance of Chun'an Nanpu Bridge

Concrete filled steel tube arch bridges have long span, and small width-span ratio. Its destabilization is half wave mode. Bridge engineers focus on aseismatic stability of the bridge all along. Chun＇an Nanpu Bridge is middle support arch bridge with a arch ring idex of 1. 167, and the bridge total length is 330 m with a 308 m span, clearance space high 60 m, and width-span ratio is 1/19.81. This paper uses reflection spectrum method to analyse the bridge aseismatic proper, and the result makes chear that the bridge forces caused by earthquake is larger than forces caused by vehicles.