Characterization of rocking shallow foundations using centrifuge model tests
Characterization of rocking shallow foundations using centrifuge model tests
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DOI：
10.1002/eqe.1181
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发表时间：
2012-04
影响因子：
4.5
通讯作者：
L. Deng;B. Kutter
中科院分区：
文献类型：
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作者：
L. Deng;B. Kutter
本文介绍了离心机模型试验的新结果，探索嵌入干砂中的浅基础的摇摆行为，为垂直承载提供了多种安全因素。介绍了摇摆剪力墙慢（准静态）循环试验和单柱摇摆桥模型动态振动试验的结果。研究了摇摆基础的力矩-旋转关系和沉降-旋转关系。在地面土壤中放置混凝土垫块来支撑某些模型，目的是减少摇动引起的沉降。研究表明，摇摆基础的行为对轴承失效的安全几何系数 Lf/Lc 很敏感，其中 Lf 是基础长度，Lc 是支撑纯轴向载荷所需的临界土壤基础接触长度。如果 Lf/Lc 相当大，那么沉降量就会很小。如果认为沉降过多并且对能量耗散和摇摆力矩能力也有影响，则在基础边缘下方放置混凝土垫块被证明是减少摇摆引起的沉降的一种有前途的方法。包括对能量耗散与摇摆基础和其他设备的重新定心之间的权衡的一般讨论。版权所有 © 2011 约翰·威利父子有限公司
This paper presents new results of centrifuge model tests exploring the behavior of rocking shallow foundations embedded in dry sand, which provides a variety of factors of safety for vertical bearing. The results of slow (quasi‐static) cyclic tests of rocking shear walls and dynamic shaking tests of single‐column rocking bridge models are presented. The moment–rotation and settlement–rotation relationships of rocking footings are investigated. Concrete pads were placed in the ground soil to support some models with the objective of reducing the settlement induced by rocking. The behavior of rocking foundation was shown to be sensitive to the geometric factor of safety with respect to bearing failure, Lf/Lc, where Lf was the footing length, and the Lc was the critical soil‐footing contact length that would be required to support pure axial loading. Settlements were shown to be small if Lf/Lc was reasonably large. Placement of concrete pads under the edges of the footing was shown to be a promising approach to reduce settlements resulting from rocking, if settlements were deemed to be excessive and also had impacts on the energy dissipation and rocking moment capacity. A general discussion of the tradeoffs between energy dissipation and re‐centering of rocking foundations and other devices is included. Copyright © 2011 John Wiley & Sons, Ltd.