【摘要】 基于大质量法的计算原理,在Midas/Civil有限元软件平台上实现多点激励下大跨度桥梁的地震反应分析.采用反映地震动空间和时间变异性的人工地震波,对大跨拱桥空间有限元模型进行在一致激励、行波激励和多点激励下的地震时程反应分析,主要探讨大质量法的应用问题.结果表明,行波激励和多点激励对大跨度连续下承式钢管混凝土系杆拱桥的地震反应有较大影响,应给予考虑.更多还原

【Abstract】 Based on the large-mass method,the seismic responses analysis of long-span bridges under multi-support excitation were implemented on the platform of commercial finite element software Midas/Civil.The artificial waves representing the spatial and temporal variability of seismic movement were used to analyze the time-history of seismic response to the uniform excitation,travelling wave excitation,and multi-support excitation upon a three-dimension finite element model of long-span arch bridge and the problem of application of large mass method was mainly researched.The calculation result showed that both the traveling and multi-support excitation should be considered in the seismic analysis because both of them have significant influence on the seismic responses of long-span arch bridge with continuous under-supported concrete-filled steel tubular(CFST) braces.更多还原