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首页> 美国卫生研究院文献>Wiley-Blackwell Online Open >Centrifuge modeling of rocking-isolated inelastic RC bridge piers
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Centrifuge modeling of rocking-isolated inelastic RC bridge piers

机译：隔震非弹性RC桥墩的离心模型

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摘要

Experimental proof is provided of an unconventional seismic design concept, which is based on deliberately underdesigning shallow foundations to promote intense rocking oscillations and thereby to dramatically improve the seismic resilience of structures. Termed rocking isolation, this new seismic design philosophy is investigated through a series of dynamic centrifuge experiments on properly scaled models of a modern reinforced concrete (RC) bridge pier. The experimental method reproduces the nonlinear and inelastic response of both the soil-footing interface and the structure. To this end, a novel scale model RC (1:50 scale) that simulates reasonably well the elastic response and the failure of prototype RC elements is utilized, along with realistic representation of the soil behavior in a geotechnical centrifuge. A variety of seismic ground motions are considered as excitations. They result in consistent demonstrably beneficial performance of the rocking-isolated pier in comparison with the one designed conventionally. Seismic demand is reduced in terms of both inertial load and deck drift. Furthermore, foundation uplifting has a self-centering potential, whereas soil yielding is shown to provide a particularly effective energy dissipation mechanism, exhibiting significant resistance to cumulative damage. Thanks to such mechanisms, the rocking pier survived, with no signs of structural distress, a deleterious sequence of seismic motions that caused collapse of the conventionally designed pier. © 2014 The Authors Earthquake Engineering & Structural Dynamics Published by John Wiley & Sons Ltd.
机译：提供了非常规抗震设计概念的实验证明，该概念基于故意对浅层基础进行了不足的设计，以促进强烈的摇摆振动，从而显着提高结构的抗震性。这种新的抗震设计理念被称为摇摆隔离，是通过在现代钢筋混凝土（RC）桥墩的适当比例模型上进行的一系列动态离心实验研究而成的。实验方法再现了土-基础界面和结构的非线性和非弹性响应。为此，使用了一种新颖的比例模型RC（1:50比例），该模型可以合理地很好地模拟弹性响应和原型RC元素的破坏，并在岩土离心机中真实地表现了土壤的行为。各种地震地震动被认为是激发。与传统设计的相比，它们可以使摇摆隔离的墩墩具有一致的明显有益的性能。在惯性载荷和甲板漂移方面都减少了地震需求。此外，地基隆起具有自动居中的潜力，而土壤屈服显示出提供特别有效的能量耗散机制，表现出对累积破坏的显着抵抗力。由于这种机制，摇摆墩得以幸存，没有结构上的问题迹象，地震运动的有害序列导致传统设计墩的坍塌。 ©2014作者：地震工程与结构动力学，作者：John Wiley＆SonsLtd。

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