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中南大学学报(自然科学版)

Journal of Central South University

第48卷    第1期    总第269期    2017年1月

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文章编号:1672-7207(2017)01-0223-10
土-结构相互作用下单层柱面网壳振动台试验及数值分析
刘毅1, 2,薛素铎2,王国鑫2,李雄彦2

(1. 中车建设工程有限公司,北京,100078;
2. 北京工业大学 建筑工程学院,北京,100124
)

摘 要: 基于设计长度×宽度×高度为7.7 m×3.2 m×1.2 m的模型箱,以长度×跨度为1.8 m×1.8 m的单层柱面网壳为研究对象,设计实现土-独立基础-单层柱面网壳结构振动台试验,研究不同地震波输入下土-独立基础-单层柱面网壳结构体系地震响应的规律,同时采用整体有限元法建立振动台试验的有限元模型,与试验结果进行对比分析。研究结果表明:考虑土-结构相互作用时,土-独立基础-单层柱面网壳结构体系的试验结果与模拟结果变化规律基本一致,土-结构相互作用下基础底部的加速度峰值响应较自由场加速度峰值响应增大;土体与基础之间滑移和提离现象及模型箱的刚度是影响试验结果与模拟结果差距的主要因素,尤其是随着振动次数增多,土体与基础之间的非线性接触更加显著;地震波频谱特性是影响土-独立基础-单层柱面网壳结构体系地震响应的重要因素,在试验设计时应当尽量避开结构体系与地震波主频一致而发生共振现象,否则造成试验结果失真。

 

关键词: 单层柱面网壳结构;土-结构相互作用;振动台试验;数值模拟;地震响应

Shaking table test of single-layer latticed cylindrical shell considering soil-structure interaction and its numerical analysis
LIU Yi1, 2, XUE Suduo2, WANG Guoxin2, LI Xiongyan2

1. CRRC Construction ENGRG. Co. Ltd., Beijing 100078, China;
2. College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China

Abstract:The thesis mainly talks about a single-layer latticed cylindrical shell with 1.8 m in length and 1.8 m in span, and a shaking table test of soil-independent foundation-latticed cylindrical shell was realized based on a model box with 7.7 m in length, 3.2 m in width and 1.2 m in depth. Then, the seismic responses of soil-independent foundation-latticed cylindrical shell subjected to different earthquake waves were studied. At the same time, a finite element model of shaking table test was established, and the numerical simulation results were compared with the test results. The results show that the test results and numerical results are in good agreement, and the peak acceleration of foundation increase compared to the peak acceleration of free field. The sliding and separation phenomenon between soil and foundation is a principal factor to affect the error between test results and numerical results. The nonlinear relationship between soil and foundation become more apparent along with the increase in vibration frequency. The spectrum characteristic of different earthquake waves is also an important factor to affect the seismic response of soil-independent foundation-latticed cylindrical shell. The resonance phenomenon should be paid more attention to between structure system and dominant frequency of earthquake wave to avoid the distortion of test results when a shaking table test is designed.

 

Key words: single-layer latticed cylindrical shell; soil-structure interaction; shaking table test; numerical simulation; seismic response

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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