《Journal of Geotechnical and Geoenvironmental Engineering》杂志刊登“深基坑桥台和支护结构的承载力设计”

作者：Luigi Callisto and Sebastiano Rampello

刊物：《Journal of Geotechnical and Geoenvironmental Engineering》，139卷第7期，1086—1095页

关键词：挡土墙结构；桩基础；地震引起的位移；抗震性能设计

摘要:本文检验了一种针对桩基础支护结构的抗震性能设计方法。这个方法假设在地震发生时，力在土体和桩基础中是等强度分布的。地震力激发的塑性机制包括结构的水平移动，同时包含桩中的塑性铰接。当结构和土体中的地震惯性力和土-桩基础系统的整体强度相等时，这个机制就被触发。同时本文论述了确定激发塑性机制的临界地震加速度的迭代步骤。结构的抗震性能通过桩基础的永久位移和相应的曲率延性需求表现出来。随后用一个完全一致的无量纲形式表示了理想桥台的迭代步骤，并将其应用于参考案例中来说明它的可行性。最后讨论了土的强度、地基的尺寸等关键因素对结构抗震性能的影响。

Capacity Design of Retaining Structures and Bridge Abutments with Deep Foundations

Authors: Luigi Callisto and Sebastiano Rampello

Journal: 《Journal of Geotechnical and Geoenvironmental Engineering》，Volume 139, Number 7,1086–1095

Key words: Earth retaining structures; Piled foundations; Earthquake-induced displacements; Seismic capacity design

Abstract: This paper examines a seismic capacity design approach for retaining structures with piled foundations, which assumes full-strength mobilization in the soil and in the foundation piles during the earthquake. The plastic mechanism activated by the seismic forces consists of a horizontal movement of the structure, involving plastic hinging in the piles. This mechanism is triggered when the seismic inertial forces acting within the structure and the soil mass equal the overall strength of the soil-pile foundation system. The paper describes an iterative procedure for evaluating the critical seismic acceleration that activates the plastic mechanism. The seismic performance of the structure is expressed by its permanent displacements and the corresponding curvature ductility demand in the foundation piles. With reference to an idealized bridge abutment, this procedure is expressed in a fully consistent no dimensional form and is applied to a reference case, to show its potentiality and to discuss the influence of a number of key parameters, such as the soil strength and the foundation geometry on the seismic performance of the structure.

原文链接：http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000825