地下综合管廊土-结构接触面参数对地震动力响应的影响数值分析

发布时间：2018-02-10 11:35

本文关键词： 地下综合管廊土-结构接触面折减系数地震动力响应数值分析　出处：《地震工程学报》2017年05期 　论文类型：期刊论文

【摘要】：为研究土-结构接触面参数对地下综合管廊地震动力响应特征的影响,建立动力有限元数值模型,模型边界采用激励侧固定边界、远离激励侧黏性边界、其余侧自由场边界的优化组合动力边界,土体本构采用HSS模型,接触面采用改进Goodman单元,动力荷载考虑三种情况(Rayleigh波的作用、底部激励了美国加利福尼亚Upland地震波以及前两者的共同作用),分别研究不同地震动输入、接触面折减系数的改变对综合管廊内力及加速度的影响。研究结果表明:在相同的折减系数条件下,与静力作用相比,动力作用下的结构内力明显增大,综合管廊设计时应考虑地震荷载作用下内力增大的情况;随着界面折减系数的增加,正弯矩极值减小,负弯矩极值增大,加速度峰值增大;在相同接触面折减系数条件下,底部地震波输入产生的结构内力极值显著高于仅有Rayleigh波输入的情况;考虑Rayleigh波和地震波共同作用条件下,引起的管廊结构内力极值与仅考虑底部地震波输入时的结构内力极值差异不大。研究成果可供地下综合管廊结构地震响应精细化数值模拟及抗震设计参考。
[Abstract]:In order to study the influence of soil-structure interface parameters on the seismic dynamic response of underground integrated pipe gallery, a dynamic finite element numerical model was established. The boundary of the model was fixed by the excitation side and far away from the viscous boundary of the excitation side. The combined dynamic boundary of the free field boundary of the other side is optimized, the soil constitutive model is HSS model, the contact surface is modified Goodman element, and the dynamic load takes into account the action of three kinds of Rayleigh waves. The bottom excites the California Upland seismic wave and the interaction of the former two to study the different ground motion inputs, respectively. The effect of the change of the reduction coefficient of the contact surface on the internal force and acceleration of the integrated pipe gallery is studied. The results show that under the same reduction coefficient, the internal force of the structure under the dynamic action is obviously larger than that under the static force. The increasing of internal force under seismic load should be taken into account in the design of integrated pipe gallery. With the increase of interface reduction coefficient, the maximum value of positive moment and negative moment increases, and the peak value of acceleration increases. Under the condition of reduction coefficient of the same contact surface, the maximum value of positive moment and negative moment increase. The maximum value of the internal force produced by the input of the bottom seismic wave is significantly higher than that of the one with only the input of the Rayleigh wave, and considering the interaction of the Rayleigh wave and the seismic wave, There is little difference between the internal force extremum caused by the pipe corridor structure and the structural internal force extremum when only considering the input of the bottom seismic wave. The research results can be used as a reference for the detailed numerical simulation of seismic response and seismic design of the underground composite pipe gallery structure.
【作者单位】：厦门理工学院土木工程与建筑学院;上海交通大学船舶海洋与建筑工程学院;合肥学院建筑工程系;厦门市建设局;
【基金】：福建省自然科学基金资助项目(2016J01271) 福建省住房和城乡建设厅科学技术项目(2015-K-38) 安徽省高等学校自然科学研究项目(KJ2013B226)
【分类号】：P315.9;TU435

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