A novel mitigation measure for normal fault-induced deformations on pile-raft systems

IF 2.6 2区 工程技术 Q2 ENGINEERING, CIVIL
Mohammadreza Jahanshahi Nowkandeh, Mehdi Ashtiani
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引用次数: 0

Abstract

Evidence from recent earthquakes has shown destructive consequences of fault-induced permanent ground movement on structures. Such observations have increased the demand for improvements in the design of structures that are dramatically vulnerable to surface fault ruptures. In this study a novel connection between the raft and the piles is proposed to mitigate the hazards associated with a normal fault on pile-raft systems by means of 3D finite element (FE) modeling. Before embarking on the parametric study, the strain-softening constitutive law used for numerical modeling of the sand has been validated against centrifuge test results. The exact location of the fix-head and unconnected pile-raft systems relative to the outcropping fault rupture in the free-field is parametrically investigated, revealing different failure mechanisms. The performance of the proposed connection for protecting the pile-raft system against normal fault-induced deformations is assessed by comparing the geotechnical and structural responses of both types of foundation. The results indicate that the pocket connection can relatively reduce the cap rotation and horizontal and vertical displacements of the raft in most scenarios. The proposed connection decreases the bending moment response of the piles to their bending moment capacity, verging on a fault offset of 0.6 m at bedrock.

针对桩-筏系统正常故障引起的变形的新型缓解措施
最近发生的地震表明,由断层引起的永久性地动会对建筑物造成破坏性后果。这些观察结果表明,结构设计极易受到地表断层破裂的影响,因此对结构设计的改进提出了更高的要求。本研究通过三维有限元(FE)建模,提出了一种筏和桩之间的新型连接方式,以减轻法向断层对桩-筏系统造成的危害。在开始参数研究之前,已根据离心机测试结果验证了用于砂数值建模的应变软化构成法则。对自由场中固定头和未连接的桩筏系统相对于出露断层破裂的确切位置进行了参数化研究,揭示了不同的破坏机制。通过比较两种地基的岩土工程和结构响应,评估了所建议的连接方式在保护桩筏系统免受正常断层引起的变形影响方面的性能。结果表明,在大多数情况下,袋式连接可相对减少筏帽旋转以及筏的水平和垂直位移。拟议的连接可将桩的弯矩响应降至其弯矩承载力,在基岩处的断层偏移量可达 0.6 米。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
4.70
自引率
21.40%
发文量
1057
审稿时长
9 months
期刊介绍: Earthquake Engineering and Engineering Vibration is an international journal sponsored by the Institute of Engineering Mechanics (IEM), China Earthquake Administration in cooperation with the Multidisciplinary Center for Earthquake Engineering Research (MCEER), and State University of New York at Buffalo. It promotes scientific exchange between Chinese and foreign scientists and engineers, to improve the theory and practice of earthquake hazards mitigation, preparedness, and recovery. The journal focuses on earthquake engineering in all aspects, including seismology, tsunamis, ground motion characteristics, soil and foundation dynamics, wave propagation, probabilistic and deterministic methods of dynamic analysis, behavior of structures, and methods for earthquake resistant design and retrofit of structures that are germane to practicing engineers. It includes seismic code requirements, as well as supplemental energy dissipation, base isolation, and structural control.
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