沉井加桩复合基础水平动力响应特性  

Dynamic Response of Laterally Loaded Caisson-piles Composite Foundation

作　　者：涂文博 黄茂松[2,3] TU Wenbo;HUANG Maosong(School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China;Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education,Tongji University,Shanghai 200092,China)

机构地区：[1]华东交通大学土木建筑学院,江西南昌330013 [2]同济大学地下建筑与工程系,上海200092 [3]同济大学岩土及地下工程教育部重点实验室,上海200092

出　　处：《防灾减灾工程学报》2019年第2期285-289,共5页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家重点基础研究发展计划(2013CB 036304);国家自然科学基金项目(51808220)资助

摘　　要：沉井加桩复合基础是一种结合沉井及群桩各自优点形成的新型跨江海桥梁深水基础型式。在复杂的江海环境下,基础将承受强风、波浪及地震等引起的水平动荷载作用,其水平动力特性研究是复合基础合理设计施工和推广应用的重要保证。基于动力Winkler模型分别提出了沉井加桩基础的频域非线性及时域非线性计算方法,并同有限元对比验证了简化方法的正确性。通过算例进一步分析了冲刷对沉井加桩基础动力特性的影响规律,结果表明,土体应力历史及土体非线性对复合基础动力阻抗、共振幅值及频率均有显著影响。Caisson-piles foundation(CCPF),which combines the advantages of caisson and pile groups,is a new type of deep water foundation for bridge crossing rivers or seas.CCPF is usually subjected to horizontal loads and moments caused by wind,ocean wave or earthquake due to the complicated marine environment.Research on lateral dynamic characteristics of CCPF has become the important guarantee for rational design and engineering application of this foundation.Based on the dynamic Winkler model,nonlinear analysis methods in the frequency domain and time domain for CCPF were proposed respectively.The reliability of the simplified methods was validated by comparing with the results from finite element simulations.Then,the scour effect on lateral vibration of CCPF was also analyzed.The results show that stress history and nonlinear characteristics of soil have significant influence on dynamic impedance,resonant amplitude and resonant frequency of CCPF.

关 键 词：沉井加桩 非线性动力响应 冲刷 频域 时域 

分 类 号：TU753.64[建筑科学—建筑技术科学]