点式幕墙单层索网谐波地震响应的几何非线性研究

石永久;李 勇;王元清

振动与冲击 ›› 2009, Vol. 28 ›› Issue (10) : 31-35.

PDF(1564 KB)
PDF(1564 KB)
振动与冲击 ›› 2009, Vol. 28 ›› Issue (10) : 31-35.
论文

点式幕墙单层索网谐波地震响应的几何非线性研究

  • 石永久;李 勇;王元清
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RESEARCH ON NONLINEARITY IN SEISIMIC RESPONSE OF CABLE NET IN POINT-SUPPORTING GLASS WALL

  • SHI Yong-jiu;LI Yong;WANG Yuan-qing
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摘要

摘 要:预应力平面单层索网是几何非线性较强的柔性张拉结构,由索中预拉力及几何非线性提供平面外刚度,在静力平衡位置预应力刚度较小,荷载作用下结构发生较大变形,因而产生了较大的几何刚度。针对几何非线性对此结构受力特性影响的重要性,对结构几何非线性作了定量分析,提出了几何非线性因子的概念;采用几何非线性时程分析方法,探讨了影响不同几何非线性的单层索网的谐波地震响应。分析结果表明,索网长宽比及索预应力对几何非线性影响较大;单层索网动力响应存在峰值共振偏移现象;并指出峰值共振频率不同于结构的线性自振频率和非线性自振频率。

Abstract

Abstract: Pre-stressed single-layer cable net falls into the group of flexible tensile structures with its strong geometric nonlinearity, which provides the cable net with the stiffness out of plane as a result of stress stiffing together with pre-stress. Due to the limited stiffness offered by the pre-stress of cable, the cable net will undergo large deflection under certain loads, which make it necessary to take into the account of the large deflection effects, which triggers the strong geometrical nonlinearity. Considering the importance of nonlinearity of the mechanical characteristics of cable net, this paper quantified the nonlinearity of cable net with a factor of nonlinearity; with the help of transient analysis of cable net of different geometric nonlinearity, the seismic response was investigated under harmonic activation. Finally, we concluded that the shape of cable net and the pre-stress affect the nonlinearity greatly; peak resonant vibration would move aside for its nonlinearity and its corresponding frequency is rather different from the linear frequency and nonlinear frequency provided by other scholars.

关键词

几何非线性 / 单层索网 / 谐波响应 / 峰值共振 / 频率偏移 / 地震响应

Key words

geometric nonlinearity / single-layer cable net / harmonic activation / resonant vibration / frequency offset / seismic response

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石永久;李 勇;王元清. 点式幕墙单层索网谐波地震响应的几何非线性研究[J]. 振动与冲击, 2009, 28(10): 31-35
SHI Yong-jiu;LI Yong;WANG Yuan-qing. RESEARCH ON NONLINEARITY IN SEISIMIC RESPONSE OF CABLE NET IN POINT-SUPPORTING GLASS WALL[J]. Journal of Vibration and Shock, 2009, 28(10): 31-35

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