单层平面索网幕墙结构的实用抗风设计方法研究  

RESEARCH ON PRACTICAL WIND-RESISTANT DESIGN METHODOLOGY OF MONOLAYER CABLE NET FOR GLASS FACADES

作　　者：吴丽丽[1] 石永久[1] 王元清[1] 

机构地区：[1]清华大学建筑玻璃与金属结构研究所

出　　处：《工程力学》2008年第2期102-109,共8页Engineering Mechanics

基　　金：高等学校博士学科点专项科研基金项目(20005003080)

摘　　要：通过对比建筑结构等效静力风荷载研究的主要分析方法,结合单层索网结构的风振响应特性,采用第一阶振型惯性力近似表达脉动风对应的等效风振力,推导了单层索网结构等效静力风荷载的解析表达形式,并给出了相应的荷载风振系数的显式表达式。分析过程中引入了一些重要参数简化计算,如引入调整系数来考虑更精确的多阶振型组合效应以及索网的几何非线性因素的影响;引入转换系数来反映由于采用与频率无关的相干函数代替与频率相关的相干函数所导致的偏差等。在单层索网幕墙结构的工程常用参数范围内,采用较合理的计算方法,如正交设计方法,对这些参数进行了系统分析,提出了可供工程设计参考实用抗风设计方法。工程算例分析表明,该文的抗风设计方法与动力分析结果吻合较好。Equivalent static wind load （ESWL） on monolayer cable net for glass facades is approximately expressed with the inertial force of the first mode, based on its characteristics of wind-induced response and comparison between prevailing theories of ESWL for building structures. The explicit expression of ESWL is thusly deduced, and the corresponding dynamic coefficient for wind loads of flexible cable net is presented herein. Some important coefficients are introduced to simplify the analysis, for example, an adjustment coefficient to include the combination effects of multiple modes and nonlinear behaviour of cable net, and a transforming coefficient to take into account the difference induced by the substitution of coherence function relevant to frequency with the function irrelevant to frequency, etc. Systematic parameter analysis on these coefficients in the range of conventional practical engineering are carried out with reasonable schemes, for example, the method of orthogonal design in experiments. A practical wind-resistant design method has been proposed. Results of engineering projects with the design method agree well with those from analytical dynamic analysis.

关 键 词：单层索网 等效静力风荷载 风振响应 非线性 相干函数 

分 类 号：TU311.3[建筑科学—结构工程]