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Seismic performance improvement of underground frame structures by changing connection type between sidewalls and slab
Soil Dynamics and Earthquake Engineering ( IF 4 ) Pub Date : 2021-06-16 , DOI: 10.1016/j.soildyn.2021.106851
Chao Ma , Dechun Lu , Hui Gao , Xiuli Du , Chengzhi Qi

Seismic failure mechanism of underground frame structures presents that the collapse of underground structures attributes to the insufficient seismic resistance of central columns. Therefore, researches have been conducted to improve the seismic performance of underground structures by enhancing the loading-carrying capacity of the central columns or decreasing the seismic loads transmitted to central columns. For this purpose, this study proposed a new approach by changing the connection type between sidewalls and slab: setting shock absorbing gap (SAG) between sidewalls and ceiling slab, which aims to decrease seismic loads transmitted to central columns. The proposal and working mechanism of SAG were illustrated detailedly. Afterwards, nonlinear finite element models, in which a developed elastoplastic constitutive model was used to simulate the 3D strength and softening behaviour of surrounding soils, were built for simulating the static and dynamic responses of underground structures. Based on the numerical results, SAG affecting the internal forces of structural components before earthquakes were discussed firstly. Then the seismic efficiency of SAG updating the seismic performance of underground frame structures was analyzed by discussing earthquake-induced damage mode of overall structures, soil pressure on structures, earthquake-induced deformations and internal forces of structural components. Finally, the seismic performance of underground frame structures influenced by the width of SAG and frictional coefficient of the sliding surface was investigated, and advice for reasonably using SAG was suggested.



中文翻译:

改变边墙与楼板连接方式提高地下框架结构抗震性能

地下框架结构的抗震破坏机理表明,地下结构的倒塌归因于中心柱抗震能力不足。因此,已经进行了研究,以通过提高中心柱的承载能力或减少传递到中心柱的地震荷载来改善地下结构的抗震性能。为此,本研究提出了一种通过改变侧壁和楼板之间的连接类型的新方法:在侧壁和天花板之间设置减震间隙(SAG),旨在减少传递到中心柱的地震荷载。详细阐述了SAG的提议和工作机制。之后,非线性有限元模型,其中开发的弹塑性本构模型用于模拟周围土壤的 3D 强度和软化行为,用于模拟地下结构的静态和动态响应。基于数值计算结果,首先讨论了地震前SAG对结构构件内力的影响。然后通过讨论整体结构的地震破坏模式、结构上的土压力、地震引起的变形和结构构件的内力,分析了SAG更新地下框架结构抗震性能的抗震效率。最后,研究了SAG宽度和滑动面摩擦系数对地下框架结构抗震性能的影响,提出了合理使用SAG的建议。

更新日期:2021-06-17
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