土-结构动力相互作用下网架结构简化分析方法研究

刘毅,薛素铎,李雄彦,王国鑫

振动与冲击 ›› 2015, Vol. 34 ›› Issue (11) : 75-82.

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PDF(1978 KB)
振动与冲击 ›› 2015, Vol. 34 ›› Issue (11) : 75-82.
论文

土-结构动力相互作用下网架结构简化分析方法研究

  • 刘毅,薛素铎,李雄彦,王国鑫
作者信息 +

Simplified analysis method of grid structure considering soil-structure dynamic interaction

  •   LIU Yi, XUE Su-duo, LI Xiong-yan ,WANG Guo-xin
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文章历史 +

摘要

根据不同学者有关地基动力阻抗的计算公式,结合整体有限元法,从工程应用出发对S-R (Swing-Rocking)模型进行修正,提出适用于分析土-结构动力相互作用下大跨空间结构的简化计算方法。基于修正的S-R模型建立土-网架结构动力相互作用的计算模型,与已验证的三维整体有限元(3-D)模型进行对比分析。研究表明,根据修正S-R模型计算所得土-网架结构相互作用体系的自振特性和地震响应与已验证的3-D模型结果呈现出完全一致的规律性且吻合较好,从而验证了修正S-R模型的合理性;在不同地震波作用下,采用Gazetas提出的地基动力阻抗公式建立的土-网架结构相互作用体系中网架节点最大位移和峰值加速度与已验证的3-D模型结果最大误差不超过8.0%,结构杆件内力最大误差不超过10%,表明Gazetas提出的地基动力阻抗公式更适用于分析土-大跨空间结构动力相互作用问题,且具有较好的精度。

Abstract

Based on the foundation dynamic impedance calculation formulas of different scholars, the S-R (Swing-Rocking) model was modified combining with the integral finite element method from view of engineering application. The practical simplified calculation method which was suitable for the analysis of soil-structure dynamic interaction of long-span spatial structure was proposed. Then the model of soil-grid structure interaction was established according to the modified S-R model, and the three-dimensional (3-D) finite element model which had been experimental verified was also established as comparison. The study shows the natural vibration properties and seismic response of soil-grid structure interaction presents same regularities and are in agree well with the 3-D model, which verify the rationality of the modified S-R model. The nodal maximum displacement error and peak acceleration error of soil-grid structure interaction are less than 8.0%, and the maximum stress error of members is less than 10% under different seismic waves. All the results indicate the foundation dynamic impedance calculation formulas proposed by Gazetas are more suitable for the analysis of soil-large span spatial structure interaction and have high precision. 
 
 

关键词

网架结构 / 土-结构动力相互作用 / 修正S-R模型 / 自振特性 / 地震响应

Key words

grid structure / soil-structure dynamic interaction / modified S-R model / natural vibration properties / seismic response

引用本文

导出引用
刘毅,薛素铎,李雄彦,王国鑫. 土-结构动力相互作用下网架结构简化分析方法研究[J]. 振动与冲击, 2015, 34(11): 75-82
LIU Yi, XUE Su-duo, LI Xiong-yan,WANG Guo-xin. Simplified analysis method of grid structure considering soil-structure dynamic interaction[J]. Journal of Vibration and Shock, 2015, 34(11): 75-82

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