大跨平屋盖的多目标等效静风荷载研究

陈波 李明 杨庆山

振动与冲击 ›› 2013, Vol. 32 ›› Issue (24) : 22-27.

PDF(1982 KB)
PDF(1982 KB)
振动与冲击 ›› 2013, Vol. 32 ›› Issue (24) : 22-27.
论文

大跨平屋盖的多目标等效静风荷载研究

  • 陈波 李明 杨庆山
作者信息 +

Equivalent static wind loads for multiple targets of long span plane roofs

  • Chen Bo Li Ming Yang Qingshan
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摘要

对平面桁架和空间网架两类典型平屋盖结构形式,研究针对所有关键节点位移和所有构件内力的多目标等效静风荷载。风振响应分析结果表明,两类结构风振响应中,共振响应明显大于背景响应,且第1阶振型起主导作用,根据该特性,用第一阶振型惯性力表示其多目标等效静风荷载,采用最小二乘法确定振型惯性力的组合系数。在工程常用的范围内,系统分析结构跨度、屋面质量、设计风速和风向等参数对平面桁架和空间网架多目标等效静风荷载的影响,得到可用于指导该类结构抗风设计的等效静风荷载风压系数的建议公式,且经校核,在该荷载静力作用下的结构响应与实际动力响应极值吻合较好。

Abstract

Equivalent static wind loads (ESWL) for multiple equivalent targets are studied for long-span plane trusses and spatial trusses, and these multiple equivalent targets include peak wind-induced response of all displacements of key nodes and all member stresses. For these two kinds of structures, the resonant response is much bigger than the background response and the 1st vibration mode has the dominant contribution to fluctuating wind-induced response. Therefore, the inertial force of this dominant vibration mode is chosen to express the ESWL for multiple equivalent targets. With this method, the effects of wind loading factors and structural factors on ESWLs of long span plane trusses and spatial trusses are investigated, and tables of ESWLs are proposed for engineering structural design. Structural responses of all structural members and all key nodes under ESWLs agree well with actual peak responses.


关键词

大跨屋盖结构 / 等效静风荷载 / 风振响应 / 平面桁架 / 空间网架

Key words

long span roof structures / equivalent static wind loads / wind-induced response / plane trusses / spatial trussesE-mail: chenbohrb@163.com

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导出引用
陈波 李明 杨庆山. 大跨平屋盖的多目标等效静风荷载研究[J]. 振动与冲击, 2013, 32(24): 22-27
Chen Bo Li Ming Yang Qingshan. Equivalent static wind loads for multiple targets of long span plane roofs[J]. Journal of Vibration and Shock, 2013, 32(24): 22-27

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