【摘要】 为了研究钢管混凝土拱桥的地震破坏程度,基于变形或内力和能量的双重破坏准则确定钢管混凝土拱桥各部分杆件的破坏指数,建立整桥的破坏评估模型,提出钢管混凝土拱桥的地震破坏评估方法。采用数值模拟方法对钢管混凝土拱桥在恒载和地震荷载作用下的内力、变形和累积能量进行分析,对钢管混凝土拱桥进行地震破坏评估,最后以南宁市永和大桥为例进行了分析。结果表明:对于抗震设防烈度为7度的钢管混凝土拱桥,在8度地震作用下全桥处于完好状态,9度地震作用下处于轻微破坏状态,满足抗震设防要求,说明该评估方法能够对地震破坏给出较准确的评估结果。更多还原

【Abstract】 In order to study the seismic damage conditions of concrete filled steel tube(CFST) bridge from the internal force,deformation and energy,the damage indexes(DI) of all the members were calculated.The evaluation model of the bridge was established and the seismic damage evaluation method of CFST arch bridge was presented.In the research,the internal forces,deformations and accumulated energy of CFST arch bridge were analyzed by numerical simulations under dead load and earthquake,and the seismic damage of CFST arch bridge was evaluated with the example of Nanning Yonghe Bridge.The results show that for the 7-degree seismic fortification intensity zone,the bridge is in perfect condition under 8-degree earthquake and there is only slight damage under 9-degree earthquake,which indicates that the bridge can meet the demands of seismic fortification.更多还原