Influence of Vertical Ground Motions on the Seismic Fragility Modeling of a Bridge-Soil-Foundation System
Influence of Vertical Ground Motions on the Seismic Fragility Modeling of a Bridge-Soil-Foundation System
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DOI：
10.1193/1.4000170
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发表时间：
2013-08
影响因子：
5
通讯作者：
Zhenghua Wang;J. Padgett;L. Dueñas-Osorio
中科院分区：
文献类型：
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作者：
Zhenghua Wang;J. Padgett;L. Dueñas-Osorio
探讨了竖向地震动(VGM)对具有液化势的桥梁-土-地基耦合体系(CBSF)构件脆性的影响，并着重讨论了在VGM下进行脆性分析所需的需求和能力模型的独特考虑。确定了考虑VGM的最佳强度测量(IMS)。此外，还得到了考虑承载力随轴力脉动变化的脆性曲线。结果表明，VGM的存在对桩和膨胀支座的破坏概率影响较小，而对固定支座的破坏概率影响较大。VGM对柱的脆性是否有影响，取决于设计轴压比。最后，得到了更精确的脆性曲面，并与常规脆性曲线的结果进行了比较。这项研究强调了VGM在选择最优IMS方面的重要作用，以及CBSF系统某些组件的容量和脆弱性表现。
This paper explores the effects of vertical ground motions (VGMs) on the component fragility of a coupled bridged-soil-foundation (CBSF) system with liquefaction potential, and highlights the unique considerations on the demand and capacity model required for fragility analysis under VGMs. Optimal intensity measures (IMs) that account for VGMs are identified. Moreover, fragility curves that consider capacity change with fluctuating axial force are derived. Results show that the presence of VGMs has a minor effect on the failure probabilities of piles and expansion bearings, while it has a great influence on fixed bearings. Whether VGMs have an impact on column fragilities depends on the design axial load ratio. Finally, more accurate fragility surfaces are derived, which are compared with results of conventional fragility curves. This study highlights the important role that VGMs play in the selection of optimal IMs, and the capacity and fragility representation of certain components of CBSF systems.