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考虑地基-结构相互作用情况,研究了上承式大跨度钢管混凝土拱桥线性及非线性地震响应。以其上承式钢管混凝土拱桥为工程背景,以三维粘弹性人工边界模拟远场地基的辐射阻尼和弹性恢复性能,建立了包括基岩和上部桥梁的整体分析模型,沿纵桥向输入amax=0.2g迁安地震波,在考虑地基-结构相互作用条件下研究了上承式大跨度钢管混凝土拱桥线性及非线性地震响应。研究表明非线性行为在桥梁进行地震响应位移分析时是不可忽视的,考虑非线性后拱肋地震响应位移计算结果增大,主拱肋部分截面弯矩My、Mz大于线性计算时结果;下弦管轴力在拱脚附近非线性计算时结果大于线性计算时结果,但幅度不大,在跨中附近非线性计算时结果小于线性计算时结果。
Considering the foundation-structure interaction, the linear and nonlinear seismic response of the long-span CFST arch bridge is studied. Taking the CFST arch bridge as the engineering background, the three-dimensional viscoelastic artificial boundary is used to simulate the radiation damping and elastic recovery of the far-field foundation. The whole analysis model including the bedrock and the upper bridge is established. The input of amax = 0.2g Qian’an seismic wave was used to study the linear and nonlinear seismic response of the long-span CFST arch bridge considering the interaction between the foundation and the structure. The results show that the nonlinear behavior can not be neglected when the bridge is subjected to the seismic response displacement analysis. The calculation results of the seismic response displacements of the nonlinear arch rib increase with the bending moment My, Mz of the main arch rib being larger than that of the linear calculation. Axial force in the non-linear calculation of the arch near the foot when the result is greater than the results of linear calculations, but the magnitude is not large, near the mid-span non-linear calculation results are less than the linear results.