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考虑支座非线性和桥墩弹塑性的影响,建立了不等墩高5跨非规则简支梁桥的有限元模型。采用非线性时程分析方法计算了不同地震波输入下多跨简支梁桥的纵向地震反应,研究了非规则多跨简支梁桥邻跨刚度比及上部结构间相互碰撞效应对桥梁纵向地震位移反应和内力反应的影响规律。研究表明,邻跨刚度比对非规则多跨简支梁桥的桥墩剪力、墩底弯矩、墩顶位移、梁体位移、墩梁间相对位移及主梁间相对位移有着显著的影响,并且邻跨刚度相差越大,影响越为显著,更容易使上部梁体发生落梁破坏;考虑桥梁上部结构碰撞效应时,邻跨比对桥梁结构反应的影响受地震波的影响较大,碰撞未必加剧落梁破坏。
Considering the influence of bearing nonlinearity and the elasto-plasticity of the abutment, a finite element model of a 5-span irregularly-supported simply supported beam with unequal piers is established. Longitudinal seismic responses of multi-span simply supported girder bridges with different seismic loads were calculated by nonlinear time-history method. The effects of adjacent span stiffness ratio and interaction of superstructure on the longitudinal seismic displacement Reaction and internal force response of the law. The results show that the ratio of adjacent span stiffness has significant influence on the pier shear force, pier bottom bending moment, pier top displacement, beam displacement, relative displacement between pier and girder and the relative displacement between girder, And the greater the difference between the adjacent span stiffness, the more significant the impact, more likely to make the upper beam body falling off the beam; Considering the impact of the bridge superstructure impact, the effect of adjacent span ratio on the bridge structure response by seismic waves, collision may not Exacerbate the falling beam damage.