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以某连续刚构桥为研究对象,借助大型有限元程序,建立了考虑主梁-桥墩、主梁-桥墩-桩基以及主梁-桥墩-桩基-土层的3种不同有限元模型;基于反应谱法,对高墩连续刚构桥的地震响应进行了相应研究。结果表明:考虑主梁-桥墩的有限元模型的自振频率明显高于考虑主梁-桥墩-桩基-土层的;横向地震加速度对连续刚构桥梁体弯矩影响较大,设计时应予以充分考虑;顺桥向地震加速度对梁体轴力影响较小,而横桥向地震加速度对轴力影响相对较大;横桥向地震加速度对梁体剪力影响程度大于顺桥向地震加速度的影响程度,且对梁体横向位移影响较大,但对顺桥向位移影响较小。
Taking a continuous rigid frame bridge as the research object, three different finite element models considering main girder-bridge pier, main girder-pier-pile foundation, main girder-pier-pile foundation- Based on the response spectrum method, the seismic response of the high pier continuous rigid frame bridge is studied. The results show that the natural frequency of the finite element model considering the main girder-bridge pier is obviously higher than that of the main girder-piers-pile foundation-soil layer. The transverse seismic acceleration has a great influence on the moment of continuous rigid frame bridge. The influence of seismic acceleration along the bridge direction on the beam body axial force is relatively small, while the impact of the transverse bridge seismic acceleration on the axial force is relatively large. The impact of the cross-bridge seismic acceleration on the beam body shear force is greater than that of the earthquake acceleration along the bridge direction Of the degree of impact, and the lateral displacement of the beam greater impact, but the displacement of the shift less affected.