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工程科学与技术:2019,51(1):27-35
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考虑群效应的土–建筑群动力相互作用参数分析
(四川大学 建筑与环境学院 深地科学与工程教育部重点实验室, 四川 成都 610065)
Parametric Analysis of Soil and Structure Cluster Interaction Considering Cluster Effect
(Key Lab. of Deep Underground Sci. and Eng. for Ministry of Education, College of Architecture and Environment, Sichuan Univ., Chengdu 610065, China)
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投稿时间:2018-02-25    修订日期:2018-08-02
中文摘要: 随着城镇化的快速发展,大量密集的建筑群体在各大城市和小城镇中不断涌现。土与建筑群的动力相互作用不同于单个结构与土的动力相互作用,研究土与建筑群动力相互作用对上部结构响应的影响规律,使研究结果能够用于考虑群效应的上部结构抗震设计。提出土与建筑群动力相互作用的群效应概念,并在已完成的土与建筑群动力相互作用振动台试验基础上,采用有限元方法研究群效应对结构动力响应的影响规律。此有限元模型采用了Davidenkov地基模型模拟土体的动力非线性特性。采用试验数据验证此有限元模型,开展了土与建筑群动力相互作用的群效应分析,研究土体特性、建筑物净距和建筑物数量对群相互作用的影响。最后,针对位移的响应规律,进行了土与建筑群动力相互作用的群效应机理分析。全面总结了土与建筑群动力相互作用的群效应规律和参数影响,结果如下:在地震作用下,建筑群中结构位置不同反应不同,表现出动力相互作用的群效应。与单个结构相比,群相互作用使得结构的加速度减少,速度则有时增大、有时减小,与输入的地震波特性和结构位置相关。而中间建筑位移反应减少,沿振动方向结构的位移增大,建筑群中远离中间建筑的周边建筑位移反应最大。位移的群效应影响系数的绝对最大值达到770.794%。建筑群数量是影响群效应的最显著的因素。土–建筑群动力相互作用随着结构间距的增大,影响不断减弱,当建筑物净距大于建筑物基础平面尺寸的1.32倍时,群效应相对较弱。由以上结果可知,土与建筑群动力相互作用对上部结构动力响应影响较大,在上部结构抗震设计时,不能忽略土与建筑群动力相互作用的群效应。
Abstract:Myrids of intensive structure clusters have been built in big cities and small towns due to the rapid development of urbanization. The dynamic interaction between soil and structure cluster is different from the dynamic interaction between a single structure and soil. The influence law of the dynamic interaction between soil and structure cluster on the response of superstructure was studied in this paper, and the results can be utilized in the seismic design of superstructure considering cluster effect. In addition, the cluster effect was first presented in this paper. According to an accomplished shaking table test of soil and buildings, a finite element model involving the shaking table test was established to study the influence laws of the cluster effect on the responses of structures. Davidenkov foundation model was used to simulate the nonlinearity of soil in the finite element model. Based on verifying the accurate of the finite element model, cluster effect was studied to extend the research of SSCI, including soil properties, structure spacing and structure number. Last, the mechanism of SSCI was studied based on the laws of the displacement. The laws and the parametric influences on the soil and structure cluster interaction were fully summarized. The results are listed as follows:Under earthquake excitation, the structures in different locations had different responses, which involves the cluster effect of SSCI. Cluster interaction reduced the acceleration responses of structures, while velocity might be larger or less than that of the single building, relating with the earthquake input and the structure location. The displacement of the central building reduced, but these of the surrounding structures along the vibration increased, and the farthest buildings from the center had the largest displacements. The maximum absolute value of the influence factor of the cluster effect for on the displacement reached 770.794%. The building number was the most significant factor that affected the cluster effect in the SSCI system. The cluster interaction constantly reduced when the structure spacing increased and disappeared. When the clear spacing was larger than as 1.32 times as the size of the building foundation size, and the cluster effect becomes weak. It can be seen from the above results that the dynamic interaction between soil and structure cluster has a significant influence on the dynamic response of superstructure. In the seismic design of superstructure, the cluster effect of the dynamic interaction between soil and structure cluster cannot be ignored.
文章编号:201800177     中图分类号:TU97    文献标志码:
基金项目:国家自然科学基金青年科学基金资助项目(51508357);四川省科技计划资助项目(2015JY0278)
作者简介:葛琪(1984-),女,副教授,博士.研究方向:工程结构抗震.E-mail:geqi@scu.edu.cn
引用文本:
葛琪,熊峰,陈江.考虑群效应的土–建筑群动力相互作用参数分析[J].工程科学与技术,2019,51(1):27-35.
GE Qi,XIONG Feng,CHEN Jiang.Parametric Analysis of Soil and Structure Cluster Interaction Considering Cluster Effect[J].Advanced Engineering Sciences,2019,51(1):27-35.