群桩-土-墩柱相互作用体系抗震性能试验及数值模拟研究

发布时间：2018-01-22 20:04

本文关键词： 土-结构相互作用拟静力试验 ABAQUS 动力响应抗震性能　出处：《地震工程与工程振动》2015年06期 　论文类型：期刊论文

【摘要】：为进一步研究土-结构相互作用(SSI)体系的抗震性能,以1∶4比例尺桥梁墩柱模型为试验对象,考虑土-结构相互作用,通过拟静力试验观察了试验现象,得到了模型滞回曲线、耗能能力等数据。通过有限元软件ABAQUS建立了与试验情况相同的有限元模型,并分析计算。建模分析结果与试验结果一致,在此基础上,以本模型为对象进行了地震反应时程分析,得到了不同地基条件下的位移时程曲线及桩身应力、桩身位移响应曲线,并用m法对比计算桩的位移响应曲线。分析结果表明:不同地基条件下群桩-土-刚度较大墩柱结构体系破坏形式不同;在地震作用下,短桩基础在桩的中段处应力达到最大值,有必要在此处予以加强;在地震作用较大时,m法计算的桩顶位移偏小,且m法无法计入群桩效应,可能导致群桩基础内力的计算偏于不安全,建议予以重视。
[Abstract]:In order to further study the seismic behavior of soil-structure interaction (SSI) system, the 1: 4 scale bridge pier and column model is taken as the experimental object, and the soil-structure interaction is considered. The experimental phenomena were observed by quasi-static test, and the hysteretic curve and energy dissipation capacity of the model were obtained. The finite element model was established by the finite element software ABAQUS. The results of modeling and analysis are consistent with the experimental results. Based on this model, the time-history analysis of seismic response is carried out, and the displacement time-history curve and pile stress under different foundation conditions are obtained. The displacement response curve of pile body is calculated by m method. The results show that the failure forms of pile group soil-column structure system are different under different foundation conditions. Under the earthquake, the stress of the short pile foundation reaches the maximum at the middle of the pile, so it is necessary to strengthen it here. The displacement of pile top calculated by m method is small when earthquake action is greater, and the pile group effect can not be taken into account by m method, which may lead to unsafe calculation of internal force of pile group foundation. It is suggested that attention should be paid to it.
【作者单位】：湖南大学土木工程学院;湖南大学建筑安全与节能教育部重点实验室;
【基金】：新世纪优秀人才支持计划(NCET-13-0190) 湖南省自然科学基金人才联合培养基金重点项目(13JJA001) 中央高校基本业务费~~
【分类号】：TU352.11;TU435
【正文快照】： 引言针对土-结构相互作用体系的抗震性能,国内外已经进行了广泛的研究工作[1]。吕西林等对软土地基上高层建筑进行过振动台试验研究,对土-结构动力相互作用效应对上部结构动力反应的影响进行了模拟试验[2]。Kongagai K等分别对考虑土-结构动力相互作用效应的不同结构进行了振

【参考文献】