循环荷载下桩土动刚度-阻尼退化模型研究  

Research on Dynamic Stiffness-damping Degradation Model of Pile-soil System under Cyclic Load

作　　者：丁选星 杨莹 DING Xuanxing;YANG Ying(Southwest Branch,Northwest Research Institute Co.,Ltd.of C.R.E.C,Chengdu 610036,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中铁西北科学研究院有限公司西南分公司,成都610036 [2]西南交通大学土木工程学院,成都610031

出　　处：《路基工程》2018年第6期108-113,共6页Subgrade Engineering

摘　　要：根据以往研究,在砂土和黏土中,循环荷载作用下,单桩基础的动力特性有明显差异。为此,基于长期循环荷载下海洋黏土变形研究的相关成果,建立软化系数经验表达式,并引入Winkler简化模型中,提出了桩土动刚度-阻尼退化模型,进一步结合循环荷载下桩基现场试验,其结果验证了该模型的合理性。此外,基于东部淤泥层的地质条件和ABAQUS软件,提出了动刚度-阻尼退化模型,研究了未来在该海域内新建单桩式基础的自振频率和横向累积变形特性。Existing experiment results show considerable difference of long-term dynamic characteristics between monopile in sand foundation and clay foundation.Based on the resrarch results of marine clay under long-term cyclic load,this paper presents a new dynamic stiffness-damping degradation model by establishing softening coefficient experience expression and being introduced into dynamic simplified Winkler model,which is capable of considering both dynamic and plastic characteristics of soil.After that,the new model was verified by in-situ test.Based on the geological conditions of east silt seam and ABAQUS software,the dynamic stiffness-damping degradation model was proposed and the natural frequency of vibration and lateral accumulative deformation characteristics of monopole foundation which is to be newly built in this area in the future were studied.

关 键 词：动力相互作用 刚度-阻尼退化 循环荷载 海洋桩基础 自振频率 横向累积变形 

分 类 号：TU311.4[建筑科学—结构工程]