某砖石古塔-地基相互作用系统地震反应分析
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摘要
为了研究在考虑土与结构作用时砖石古塔的地震反应规律,为砖石古塔的抗震加固提供参考,以西安兴教寺玄奘塔为研究对象,通过附加人工边界,建立玄奘塔与地基相互作用系统的数值计算模型,同时输入三向地震波,对相互作用系统进行时程分析。计算结构的位移和应力反应,并与不考虑相互作用时的计算结果进行比较。结果表明,结构的水平剪应力、竖向剪应力及竖向正应力在塔体中部最大,层间位移值在塔体中部及顶部均较大,且最大值分布于中间楼层。由计算结果可知,中间楼层和顶层均为砖石古塔的抗震危险截面。
In order to study the characters of seismic response of masonry pagoda under the interaction of soil and structure,to refer to seismic reinforcement to masonry pagoda,artifical boundary conditions ware set up,and the calculation model which included interaction system of soil and structure of Xuanzhuang Pagoda in Xingjiao Temple in Xi'an,Shaanxi Province was established.Under three dimension earthquake waves,the seismic response analysis was done by time history analysis method.The follows were indicated by calculation results that the maximum value of horizontal stress,the vertical stress and the axial stress of the tower were located in the mid of the structure.And the story drift in the mid and top of the structure was larger than the other and the maximum value was in the mid.Therefore,the mid story and top story were critical seismic sections of masonry pagoda.
In order to study the characters of seismic response of masonry pagoda under the interaction of soil and structure,to refer to seismic reinforcement to masonry pagoda,artifical boundary conditions ware set up,and the calculation model which included interaction system of soil and structure of Xuanzhuang Pagoda in Xingjiao Temple in Xi'an,Shaanxi Province was established.Under three dimension earthquake waves,the seismic response analysis was done by time history analysis method.The follows were indicated by calculation results that the maximum value of horizontal stress,the vertical stress and the axial stress of the tower were located in the mid of the structure.And the story drift in the mid and top of the structure was larger than the other and the maximum value was in the mid.Therefore,the mid story and top story were critical seismic sections of masonry pagoda.
引文
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[2]姚道平,谢志招,许仪西,等.测试分析石结构古塔抗震性能[J].工程抗震与加固改造,2009,31(3):107-112.
[3]魏俊亚,张东平.砖石古塔动力特性研究[J].工程抗震与加固改造,2008,30(5):103-106.
[4]卢俊龙.砖石古塔土-结构相互作用理论与应用研究[D].西安:西安建筑科技大学,2008.
[5]赵均海.强度理论及其工程应用[M].北京:科学出版社,2003.
[6]Lee Chan-Hee,Lee Myeong-Seong,Suh Man-Cheol,et al.Weathering and Deterioration of Rock Properties of the DabotapPagoda(World Cultural Heritage),Republic of Korea[J].Environmental Geology,2005,47(4):547-557.
[7]陈平,赵冬,姚谦峰.西安大雁塔抗震能力探讨[J].建筑结构学报,1999,20(1):46-49.
[8]李丽娟,施明诚,梅占馨.大雁塔地震可靠性分析[J].应用力学学报,1994,11(2):86-91.
[9]Lee Dong-Sik,Lee Chan-Hee,Kim Jiyoung,et al.GeochemicalCharacteristics of Surface Efflorescence on the Seventh CenturyStone Pagoda in Republic of Korea[J].Environmental Geology,2009,58(1):197-204.
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