大跨连续刚构桥系梁地震响应分析

Seismic Response of the Collar Beam of Continuous Rigid Frame Bridge

为研究系梁参数及系梁屈服后对桥墩内力的影响,基于Perfom-3D有限元软件,对单墩模型和全桥模型进行研究分析。结果表明,系梁的设置减小了桥墩内力;系梁刚度越大,桥墩内力值越小;通过增设系梁,系梁成为结构抗震设计的薄弱环节,在设计地震或者罕遇地震下,系梁先于桥墩进入屈服,消耗了地震能量,提高了桥墩的抗震性能,从而保证了桥梁结构的安全,这种设置适中刚度系梁的桥墩具有明显的抗震优势。

In order to study the influence of collar beam parameters and collar beam yield on the internal force of piers,based on the finite element program Perform-3 D,the single pier model and the whole bridge model were researched.The analysis results show that the setting of collar beam reduces the internal force of the pier,and the greater the stiffness of the collar beam,the smaller the internal force of the bridge pier would be.After the addition of collar beam,the collar beam is a weak component in the seismic design.Under the action of design earthquake or severe earthquake,collar beam yields before the bridge pier to dissipate seismic energy in order to improve the seismic performance of the bridge pier,thus it ensures the safety of the bridge structure.The seismic performance of the bridge pier with moderate stiffness has obvious advantage.