【摘要】 为了明确独柱墩梁桥的破坏机理并提出有效的抗倾覆承载力计算方法,基于箱梁、支座和桥墩三者之间的相互作用关系,构造了抗倾覆承载力实用计算方法,并通过考虑几何非线性和接触非线性,建立了独柱墩梁桥抗倾覆计算的有限元模型。对上虞春晖大桥采用实用计算和建立有限元模型方法进行了对比研究,并与倒塌现场实际倾覆荷载进行了对比验证。研究结果表明:独柱墩梁桥抗倾覆力矩包括上部结构自重和端部支座反力对转动中心的力矩;采用实用计算方法和有限元模拟得到的倾覆极限荷载与春晖桥现场倒塌实测荷载均较为吻合,验证了实用计算方法和有限元模型的正确性;上部结构线重度对结构抗倾覆有显著影响。更多还原

【Abstract】 In order to find out the failure mechanism and propose effective calculation method for anti-overturning capacity of single column pier girder bridge,apractical calculation method for anti-overturning capacity was constructed with the interactions among box girder,bearing and pier considered.With the geometric nonlinear and contact nonlinear considered,the finite element model for anti-overturning capacity of single column pier girder bridge was established.A comparative study between the practical calculation method and the finite element model was conducted on Chunhui Bridge,and the calculation results were validated by the load measured in the collapse site of Chunhui Bridge.The results show that the anti-overturning moment of single column pier girder bridge includes the moment around the rotation center generated by self weight and support reaction in end position;the overturning ultimate loads with the practical calculation method and the finite element simulation are proved in good agreement with the measured load inthe collapse site of Chunhui Bridge.The correctness of the practical calculation method and the finite element model are proved to be correct.The linear gravity of the super structure has significant effect on anti-overturning capacity of structures.更多还原