非规则高墩大跨连续刚构桥地震响应分析

为得到非规则高墩大跨连续刚构桥的地震响应情况,建立了一致激励和多点激励情况下的运动方程,采用Midas Civil软件建立动力分析模型,输入三向地震波,对比分析了一致激励和多点激励下的地震响应.结果表明:(1)地震荷载作用下扭转效应比较明显,矮墩的弯矩与扭矩均较高墩大;(2)考虑多点激励时,桥梁的顺桥向振动有增加的趋势,对桥墩有不利影响;在顺桥向两桥墩位移时程曲线类似,在横桥向则没有明显的关联.

Analysis of Seismic Response of Irregular High Pier Long Span Continuous Rigid Frame Bridge

Aimed to obtain the seismic response of an irregular high pier long span continuous rigid frame bridge,the motion equation under the condition of uniform excitation and multi-support excitation were es-tablished. The software Midas Civil was adopted to build the dynamic analysis model,the three-way seismic waves were input, and the seismic responses under the con excitation were comparatively analyzed. The results indicate dition of uniform excitation and multi-support that, under seismic load, the torsional effect is very obvious and the bending moment and the torsion moment of the shorter pier are larger than that of the higher pier;with the multi-support excitation considered,the vibration in the longitudinal direction tends to increase, which has adverse effects on the piers;and the time-displacement curves of the two piers are simi- lar in the longitudinal direction,hut in the transverse direction the curves are not significantly associated.