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应用瞬态波函数法,针对双跨连续梁桥在竖向地震激励下可能出现的多次弹性重撞击问题进行了研究.推导出桥梁结构多次弹性重撞击问题的理论解,并采用临时组合结构法,求解了桥跨结构与桥墩之间的重撞击力.通过对桥梁算例的数值分析,计算模拟了多次重撞击现象,并分析了竖向地震激励周期、桥墩横截面积、梁与墩长度比以及桥跨弹性模量等参数对桥梁结构撞击响应的影响.研究结果表明,竖向地震可能使得桥跨结构与桥墩间发生多次重撞击行为,引发轴力的高频振荡,对桥梁结构响应有着明显的影响.多次重撞击的发生以及重撞击力的幅值对竖向地震激励周期相当敏感;梁与墩长度比和桥跨弹性模量都可以显著影响桥梁在竖向地震激励下的响应机理,应在桥梁抗震设计中予以考虑.
A transient wave function method is used to study the multiple elastic impact impact problems of double-span continuous girder bridges under vertical seismic excitation.A theoretical solution to the problem of repeated elastic impact of bridge structures is deduced, Structural method to solve the heavy impact between the bridge structure and the bridge pier.By numerical analysis of the bridge example, the phenomenon of repeated heavy impact simulation is simulated and the vertical seismic excitation period, the cross-sectional area of the pier, the beam And pier length ratio as well as bridge span elastic modulus and other parameters on the impact response of the bridge structure.The results show that the vertical earthquake may make the bridge span and bridge piers multiple repeated heavy impact behavior, The impact on the bridge structure has a significant impact.Multiple heavy impact and impact impact amplitude is very sensitive to the vertical seismic excitation period; beam and pier length ratio and bridge span modulus can significantly affect the vertical bridge The response mechanism under earthquake excitation should be considered in seismic design of bridges.