Nonlinear response of the pile group foundation for lateral loads using pushover analysis

IF 1.4 4区 工程技术 Q3 ENGINEERING, CIVIL Earthquakes and Structures Pub Date : 2020-10-01 DOI:10.12989/EAS.2020.19.4.273
Yongliang Zhang, Xingchong Chen, Xiyin Zhang, M. Ding, Yi Wang, Liu Zhengnan
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引用次数: 11

Abstract

The pile group foundation is widely used for gravity pier of high-speed railway bridges in China. If a moderate or strong earthquake occurs, the pile-surrounding soil will exhibit obvious nonlinearity and significant pile group effect. In this study, an improved pushover analysis model for the pile group foundation with consideration of pile group effect is presented and validated by the quasi-static test. The improved model uses simplified springs to simulate the soil lateral resistance, side friction and tip resistance. PM (axial load-bending moment) plastic hinge model is introduced to simulate the impact of the axial force changing of pile group on their elastic-plastic characteristics. The pile group effect is considered in stress-stain relations of the lateral soil resistance with a reduction factor. The influence factors on nonlinear characteristics and plastic hinge distribution of the pile group foundation are discussed, including the pier height, longitudinal reinforcement ratio and stirrup ratio of the pile, and soil mechanical parameters. Furthermore, the displacement ductility factor, resistance increase factor and yielding stiffness ratio are provided to evaluate the seismic performance of soil-pile system. A case study for the pile group foundation of a railway simply supported beam bridge with a 32 m-span is conducted by numerical analysis. It is shown that the ultimate lateral force of pile group is not determined by the yielding force of the single one in these piles. Therefore, the pile group effect is essential for the seismic performance evaluation of the railway bridge with pile group foundation.
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基于pushover分析的群桩基础在侧向荷载作用下的非线性响应
群桩基础在高速铁路桥梁重力墩中应用广泛。当发生中、强地震时,桩周土体会表现出明显的非线性和显著的群桩效应。本文提出了一种考虑群桩效应的改进群桩基础推覆分析模型,并通过拟静力试验进行了验证。改进后的模型采用简化的弹簧来模拟土的侧向阻力、侧摩阻力和尖端阻力。引入轴向荷载-弯矩塑性铰模型,模拟群桩轴向力变化对群桩弹塑性特性的影响。在带折减系数的横向土阻力应力-应变关系中考虑了群桩效应。讨论了影响群桩基础非线性特性和塑性铰分布的因素,包括墩高、桩的纵向配筋比和配箍比以及土体力学参数。并给出了位移延性系数、阻力增大系数和屈服刚度比来评价桩-土体系的抗震性能。以某跨度为32m的铁路简支梁桥群桩基础为例,进行了数值分析。结果表明,群桩的极限侧向力不是由单桩屈服力决定的。因此,在群桩基础铁路桥梁抗震性能评价中,群桩效应是必不可少的。
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来源期刊
Earthquakes and Structures
Earthquakes and Structures ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
2.90
自引率
20.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Earthquakes and Structures, An International Journal, focuses on the effects of earthquakes on civil engineering structures. The journal will serve as a powerful repository of technical information and will provide a highimpact publication platform for the global community of researchers in the traditional, as well as emerging, subdisciplines of the broader earthquake engineering field. Specifically, some of the major topics covered by the Journal include: .. characterization of strong ground motions, .. quantification of earthquake demand and structural capacity, .. design of earthquake resistant structures and foundations, .. experimental and computational methods, .. seismic regulations and building codes, .. seismic hazard assessment, .. seismic risk mitigation, .. site effects and soil-structure interaction, .. assessment, repair and strengthening of existing structures, including historic structures and monuments, and .. emerging technologies including passive control technologies, structural monitoring systems, and cyberinfrastructure tools for seismic data management, experimental applications, early warning and response
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