深厚场地大型桥梁桩基础随机地震反应及可靠性分析

›› 2007, Vol. 28 ›› Issue (2): 263-268.

深厚场地大型桥梁桩基础随机地震反应及可靠性分析

刘汉龙¹，王志华^{1, 2}，陈国兴²

1. 河海大学岩土工程水利部重点实验室/岩土工程科学研究所，南京 210098；2. 南京工业大学岩土工程研究所，南京 210009

收稿日期:2005-03-22 出版日期:2007-02-10 发布日期:2013-08-28
作者简介:刘汉龙，男，1964年生，博士，教授，博士生导师，主要从事土动力学与地基基础方面的教学与科研工作

Stochastic seismic response and reliability analysis of large pile group foundation for bridge on deep overburden layers

LIU Han-long¹, WANG Zhi-hua^{1, 2}, CHEN Guo-xing²

1. Key Laboratory for Geotechnical Engineering of Ministry of Water Resources, Institute of Geotechnical Engineering, Hohai University, Nanjing 210098, China；2. Institute of Geotechnical Engineering, Nanjing University of Technology, Nanjing 210009, China

Received:2005-03-22 Online:2007-02-10 Published:2013-08-28

摘要/Abstract

摘要： 以苏通长江大桥主墩特大型群桩基础为研究背景，考虑地震动的不确定性，将地震激励作为平稳随机过程，采用随机地震反应分析方法，对深厚场地上群桩基础受上部桥墩荷载下的地震反应进行研究。土体动力非线性性能采用等效线性化方法考虑。由于桥墩惯性作用以及软土土层对桩身位移的约束作用，地震激励下桩身位移呈三角形分布。土体位移与土体和基础间距离有关，桥墩-桩-土相互作用对基础两侧1.5倍基础宽度的土体位移有较大影响。桩体内力反应结果表明，桩顶及桩身上部剪力及弯矩均较大，边桩剪力显著大于中间桩剪力。此外，基于强度破坏准则，对以桩身屈服剪力作为控制指标的群桩基础动力可靠性进行了分析。

关键词: 群桩基础, 随机地震反应, 深厚场地, 动力可靠性, 强度破坏

Abstract: The giant pile group foundation of the Su-Tong Bridge located on the Yangtze River is selected to be the subject investigated. The seismic excitation is regarded as stationary stochastic process considering the uncertainties of real seismogram. A stochastic seismic response method, in which the complex response technique is employed, is applied to study the dynamic responses of this pile group foundation with a large pier cap. The dynamic nonlinearity of soils is considered through the equivalent linearity method. During a seismic motion, the displacements along depths of pile shaft appear triangle because of inertia force of pier and weak restraint of soft soil. The displacement of soil is related to the distance between soil and pile foundation. The effects of pier-pile-soil interaction on displacement response of the soil surrounding the pile foundation are significant. The effected range is about 1.5 times width of pile foundation. The internal force responses of piles indicate that the bending moments and shear forces of pile head and upper portion of pile shaft are larger relatively. The shear force of outer piles is marked larger than that of center piles. In addition, based on the principle of intensity damage, the dynamic reliabilities of the pile foundation are analyzed under four different yield shear force levels.

Key words: pile group foundation, stochastic seismic response, deep overburden layers, dynamic reliability, intensity damage

中图分类号:

TV 223.7

刘汉龙，王志华，陈国兴. 深厚场地大型桥梁桩基础随机地震反应及可靠性分析[J]. , 2007, 28(2): 263-268.

LIU Han-long, WANG Zhi-hua, CHEN Guo-xing. Stochastic seismic response and reliability analysis of large pile group foundation for bridge on deep overburden layers[J]. , 2007, 28(2): 263-268.

参考文献

相关文章 15

[1]	朱姣，许汉刚，陈国兴, . 苏州第四纪深厚沉积层一维等效线性和非线性地震反应对比分析[J]. , 2018, 39(4): 1479-1490.
[2]	冯君，张俊云，朱明，江南,. 软土地层高承台桥梁群桩基础横向承载特性研究[J]. , 2016, 37(S2): 94-104.
[3]	邵生俊，陈菲，代亚锋，陆嫄 , . 结构性黄土的剪切带及强度特性的真三轴试验研究[J]. , 2015, 36(S1): 66-70.
[4]	梁鑫，程谦恭，陈建明，李良广，. 采空区上方高速铁路桥梁群桩基础模型试验研究[J]. , 2015, 36(7): 1865-1876.
[5]	刘晓，唐辉明，熊承仁，刘清秉，. 考虑能量-时间分布的边坡动力可靠性分析新方法[J]. , 2015, 36(5): 1428-1443.
[6]	伍程杰，俞峰，龚晓南，林存刚，梁荣柱 , . 开挖卸荷对既有群桩竖向承载性状的影响分析[J]. , 2014, 35(9): 2602-2608.
[7]	高子坤，施建勇 . 散粒材料压缩模量修正及群桩基础稳定性研究[J]. , 2013, 34(8): 2174-2180.
[8]	张宁宁，陈志坚，陈元俊，边磊 . PSI和CRI联合算法用于苏通大桥基础沉降监测[J]. , 2012, 33(7): 2167-2173.
[9]	陈志坚，陈欣迪，唐勇，张宁宁 . 超大型深水群桩基础的传感器保护技术[J]. , 2012, 33(11): 3509-3515.
[10]	陈清军，杨永胜. 土层随机地震反应分析中侧向边界的影响分析[J]. , 2011, 32(11): 3442-3447.
[11]	徐光明，蔡正银，曾友金，顾行文，李士林，刘永绣，吴荔丹. 一种新型板桩码头结构的离心模拟[J]. , 2010, 31(S1): 48-52.
[12]	于清高，邵生俊，佘芳涛，张建辉. 真三轴条件下Q2黄土的破坏模式与强度特性研究[J]. , 2010, 31(1): 66-70.
[13]	董天文，梁力，黄连壮，杨重光，王明恕 . 螺旋群桩基础承载性状试验研究[J]. , 2008, 29(4): 893-896.
[14]	王俊杰，朱俊高，吴寿昌 . 大规模超长群桩基础工作性能的数值模拟[J]. , 2008, 29(3): 701-706.
[15]	吴鹏. 基于刚性承台群桩沉降的可靠度研究[J]. , 2007, 28(8): 1744-1748.

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed