超厚软土地基重型设备厂房上部结构与地基基础共同作用分析
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摘要
以某高铁动车检修地基工程为例,构建桩土作用简化模型,并采用m法计算各土体弹簧水平及竖向刚度,进行可靠性分析。基于该桩土作用简化模型,上部结构与地基基础共同作用,采用有限元方法从动力特性、位移及结构内力3方面,对比分析静调库上部结构与地基基础的整体模型与独立模型。研究结果表明考虑共同作用有利于抗震作用;结构相对变柔使结构在水平荷载作用下位移量相对增大;基础不同主要影响钢柱柱底及与之相连的基础梁梁端弯矩。
Taking a high-speed rail bullet train maintenance foundation project as an example, a simplified model of pile-soil action is constructed,and the horizontal and vertical stiffness of each soil spring is calculated by m method; the reliability analysis is carried out. Based on the simplified model of pile-soil interaction, the super-structure and foundation interact together, the integral model and independent model of the super-structure and foundation of the static control tank are compared and analyzed by using the finite element method from three aspects of dynamic characteristics,displacement,structural internal force. The results show that the interaction is beneficial to the seismic response,the relative flexibility of the structure increases the displacement of the structure under horizontal load,the different foundation mainly affects the bottom of steel column and the bending moment at the end of foundation beam connected with it.
Taking a high-speed rail bullet train maintenance foundation project as an example, a simplified model of pile-soil action is constructed,and the horizontal and vertical stiffness of each soil spring is calculated by m method; the reliability analysis is carried out. Based on the simplified model of pile-soil interaction, the super-structure and foundation interact together, the integral model and independent model of the super-structure and foundation of the static control tank are compared and analyzed by using the finite element method from three aspects of dynamic characteristics,displacement,structural internal force. The results show that the interaction is beneficial to the seismic response,the relative flexibility of the structure increases the displacement of the structure under horizontal load,the different foundation mainly affects the bottom of steel column and the bending moment at the end of foundation beam connected with it.
引文
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[4]宋宁,李兴祥,李利娟.布袋注浆桩与高压旋喷桩在沿海软土地基处理中的对比分析[J].施工技术,2018,47(22):75-78.
[5]马健,姜爽,刘丽.高能级强夯置换处理软土地基孔隙水压力研究[J].施工技术,2017,46(8):12-15.
[6]熊辉,邹银生,许振宇.层状场域内桩-土-上部结构的整体动力有限元模拟[J].土木工程学报,2004,37(9):55-61.
[7] MEYERHOF G G. Some recent foundation research and its application to design[J]. The structural engineer,1999,31:151-167.
[8]何晓慧,孟达,常占东,等.地震载荷下桩-土-上部结构作用机理与数值模拟[J].辽宁科技大学学报,2008,31(6):616-620.
[9] CHRISTIAN J T. Soil structure-interaction for tall buildings[J].Planning and design of tall buildings Lehigh U,1972,1(S1):967-983.
[10]齐永正.地基-基础-上部结构共同作用三维数值模拟分析[J].岩土力学,2007,28(S1):859-862.
[11]蒋玉敏.框架-核心筒结构与地基基础动力相互作用振动台试验研究[D].合肥:合肥工业大学,2016.
[12]夏栋舟,何益斌,刘建华.刚性桩复合地基-上部结构动力相互作用体系抗震性能及影响因素分析[J].岩土力学,2009,30(11):3505-3511.
[13]施舒.基础与上部结构共同作用的研究[D].杭州:浙江大学,2013.