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考虑地基-结构相互作用的钢管混凝土拱桥非线性地震响应

, PP. 63-68

Keywords: 桥梁工程,钢管混凝土拱桥,粘弹性人工边界,地基-结构相互作用,地震响应,非线性

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Abstract:

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.

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