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首页> 外文会议>NATO advanced research workshop on 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：非线性材料和土壤反应占桥梁的地震评估，以及不同边界条件

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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：使用推送分析技​​术的桥梁的地震评估往往忽略了一些非线性来源的效果，例如与基础土壤和边界条件相关的那些，这可能会显着改变桥梁的整体性能。在这种情况下，使用集总塑性模型评估典型立交桥的地震响应，以考虑码头和桩的关键横截面的无弹性行为，以及非线性弹簧考虑基础 - 土壤依从性;此外，建立并与更简单的型号进行了详细的抵座底座土壤系统的固体有限元模型。当抵接土壤系统包括在分析中时，分析结果显示出显着不同的地震行为，而不是简单地考虑在先前研究中通常完成的钉扎（在横向）上。此外，为了更强的激励，可以看出，由于介绍了非弹性机制（PIER，桩，桩帽和土壤）和边界条件发生变化（即关节/间隙闭合），对基础和土壤合规作用的假设越来越重要的作用，可以潜在地修改预期的故障层次，以及桥梁两方向上的随后的推动曲线。

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