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首页> 外文会议>Coupled site and soil-structure interaction effects with application to seismic risk mitigation >SEISMIC ASSESSMENT OF BRIDGES ACCOUNTING FOR NONLINEAR MATERIAL AND SOIL RESPONSE, AND VARYING BOUNDARY CONDITIONS
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SEISMIC ASSESSMENT OF BRIDGES ACCOUNTING FOR NONLINEAR MATERIAL AND SOIL RESPONSE, AND VARYING BOUNDARY CONDITIONS

机译：非线性材料和土壤响应桥梁的地震评估以及变化的边界条件

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摘要

Seismic assessment of bridges using the pushover analysis technique often ignores the effect of some sources of nonlinearity such as those associated with the foundation soil and the boundary conditions, that may significantly modify the overall performance of a bridge. In this context, the seismic response of a typical overpass is assessed herein using lumped plasticity models to account for the inelastic behaviour of the critical cross-sections of piers and piles, and nonlinear springs to consider foundation-soil compliance; in addition, a detailed solid finite element model of the abutment-embankment-foundation soil system is set up and compared with the simpler models. The results of the analysis show a markedly different seismic behaviour when the abutment-soil system is included in the analysis, rather than simply considering a pinned support (in the transverse direction) as usually done in previous studies. Furthermore, for stronger excitations, it is seen that as inelastic mechanisms (of piers, piles, pile caps, and soil) are introduced and boundary conditions change (i.e., joint/gap closure), the assumptions made on the foundation and soil compliance play an increasingly important role that can potentially modify the anticipated failure hierarchy, as well as the ensuing pushover curves in both directions of the bridge.
机译：使用推覆分析技术对桥梁进行地震评估通常会忽略某些非线性源的影响，例如与基础土壤和边界条件相关的非线性源的影响，这可能会大大改变桥梁的整体性能。在这种情况下，本文使用集总塑性模型来评估典型立交桥的地震响应，以考虑墩和桩的关键截面的非弹性行为，并考虑非线性弹簧来考虑地基土的柔度。另外，建立了一个详细的基台-路堤-基础-土体系的固体有限元模型，并将其与较简单的模型进行比较。分析结果表明，当将基台-土壤系统包括在分析中时，地震行为有明显不同，而不是像以前的研究中那样简单地考虑固定支撑（横向）。此外，对于更强的激励，可以看出，随着引入（墩，桩，桩帽和土）的非弹性机制，边界条件发生变化（即，节理/缝隙封闭），对地基和土壤顺应性的假设就发挥了作用。越来越重要的角色可以潜在地修改预期的故障层次，以及随后在桥的两个方向上产生的下垂曲线。

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