1.南京工业大学岩土工程研究所,江苏 南京 210009
2.扬州工业职业技术学院建筑工程学院,江苏 扬州 225127
3.南京工程学院建筑工程学院,江苏 南京 211167
4.南京江宁经济技术开发总公司,江苏 南京 211106
朱明轩(1995—),男,硕士研究生。主要从事土-结构动力相互作用的隔震结构抗震性能研究。E-mail:914604968@qq.com
于旭(1977—),男,教授,博士。主要从事土-结构动力相互作用的隔震结构抗震性能研究。E-mail:yuxurichard@sina.com
纸质出版:2022-02-28
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朱明轩,陈礼飞,于旭等.砂土液化对基础隔震结构地震反应的影响分析[J].防灾减灾工程学报,2022,42(01):162-170.
ZHU Mingxuan,CHEN Lifei,YU Xu,et al.Influence of Sand Liquefaction on Seismic Response of Base Isolated Structures[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(01):162-170.
朱明轩,陈礼飞,于旭等.砂土液化对基础隔震结构地震反应的影响分析[J].防灾减灾工程学报,2022,42(01):162-170. DOI: 10.13409/j.cnki.jdpme.201912083.
ZHU Mingxuan,CHEN Lifei,YU Xu,et al.Influence of Sand Liquefaction on Seismic Response of Base Isolated Structures[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(01):162-170. DOI: 10.13409/j.cnki.jdpme.201912083.
砂土液化会对结构的地震反应产生不可忽视的影响,这一现象也将对基础隔震结构地震反应规律产生影响。基于有限元方法,采用ABAQUS建立了土⁃隔震结构非线性动力相互作用的整体有限元分析模型,针对不同地基液化情况对基础隔震结构地震反应规律及隔震效果的影响进行了深入分析。结果表明:隔震结构下部桩基础能够有效提高下部地基的抗液化能力,进而保证隔震结构的整体稳定性。总体来看,液化场地上隔震结构的隔震效果及地震反应与输入地震动的特性相关,近场地震作用下液化地基上隔震结构的隔震性能保持良好,而远场强震作用下液化地基上隔震结构的隔震效果降低。同时隔震层产生较大的位移反应可能导致隔震支座失稳或强度破坏,设计时需特别注意。
Sand liquefaction will have a non-negligible impact on the seismic response of the structure, and this phenomenon will also have an impact on the seismic response laws of the base isolation structure. Based on the finite element method, the finite element analysis model of nonlinear dynamic interaction of soil-isolated structures was established by ABAQUS. The influence of different liquefaction conditions on the seismic response laws of base-isolated structures and the isolation effect were analyzed. The research shows that the pile foundation of the isolated structure can effectively improve the liquefaction resistance of the foundation soil, and thus ensure the overall stability of the isolated structure. In general, the isolation effect and seismic response of the isolated structures on the liquefied site are related to the characteristics of the input ground motion. The isolated performance remains good under near-field earthquakes, but reduced under far-field strong earthquakes. Besides, the large response of the isolation layer displacement may lead to the instability or strength damage of the isolation bearings. Particular attention must be paid to the design.
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