【作者】 王科；

【导师】 陈波；

【作者基本信息】 北京交通大学 ， 结构工程， 2013， 硕士

【摘要】 柱状屋盖结构是一种典型的大跨屋盖形式,工程应用广泛。风荷载是该类结构设计的主要荷载之一。现行规范GB—50009中抗风设计条文给出的风荷载风振系数βz计算公式,主要是针对高层、高耸等仅考虑第一阶振型的结构形式,而对柱状盖结构没有明确给出相关规定。本文选择单层柱面网壳、双层柱面网壳以及平面拱形桁架三种柱状屋盖结构形式,研究风荷载、地震作用和结构参数在工程常用的范围内变化时,结构风振响应、地震效应和等效静风荷载的变化规律,提出供结构设计参考的风荷载确定方法。本文主要完成了以下几个方面工作：(1)完成了三种矢跨比、三种长跨比共计9个柱面屋盖的同步测压风洞实验。(2)综合考虑各参数变化时,几类常用的柱状屋盖结构的地震响应与风振响应的变化规律,结果表明：风荷载参数变化时,地震响应与风振响应均应考虑。(3)利用风振响应的三分量法的分析方法,对三类柱状屋盖结构形式进行系统化的参数分析,探讨了该类结构共振响应与背景响应比值随各参数的变化规律,分别给出了这三类结构抗风类型划分的具体划分界限。(4)基于风振响应,研究三类柱状屋盖的多目标等效静风荷载,将其分为平均风压系数和等效静风荷载脉动风压系数两部分。研究多目标等效静风荷载脉动风压系数峰值Cf(等效于规范推荐用的风振系数与体型系数乘积)随各参数的变化规律,对求得的Cf进行数据拟合,将q表示为折算频率的函数；最后得到三类柱状屋盖的Cf建议公式,供该类结构抗风设计使用。工程应用时,可以根据Cf建议公式快速准确地确定柱状屋盖的设计用风荷载标准值。更多还原

【Abstract】 The cylindrical roof, a typical large span roof, is widely used in architectures. But the structure is strong sensitivity to the wind loads. Currently the provisions of wind vibration coefficient βz in the existing GB-50009are only for the high-rise structure and high-rise structure in the main, considering only the first vibration mode of the structure rather than long span roof.Studies of seismic response,wind-induced response and equivalent static wind load are carried out on the three commonly used the long span cylindrical roofs for wind loads、earthquake and structural parameters within commonly used engineering and the applied wind-resistant method of the long span roofs is proposed. The main results in this paper have been achieved as follows:(1) With wind tunnel experiment, simultaneous pressure measurements were made on9cylindrical roof models with3different rise-span ratios and3different aspect ratios.(2) Parametric analysis and comparisons between seismic response and wind-induced response are carried out on the three common long span cylindrical roofs. And then reasonable comparison tables of seismic response and wind-induced response are set for preliminary design of the structure to evaluate the controlled load of structure.(3) Based three-component method, parameter study is done on wind-induced response for the three common long span cylindrical roofs above. Further, changes of resonant response/background response are detailed. Finally, the practically specific criteria of the cylindrical roof structure are summarized.(4) On the basis of wind-induced response, the multiple equivalent objectives are divided into mean wind pressure coefficient and the equivalent static wind load fluctuating pressure coefficient. Parameter study is done on Cf (equivalent to the wind load factors multiply the high coefficient). The fitting formulas of Cf with a certain probability are given and expressed as a function of frequency conversion. Finally, the practical expressions of vibration coefficient for multiple equivalent objectives are given according to Cf for structure of the wind-resistant design.更多还原