论文部分内容阅读
在脉动风压下结构的风振系数是结构物特别是高耸结构物在抗风计算中的重要问题。苏联、加拿大、法国等国文献或规范[1][2][4][8]等在确定脉动风压的动力系数时,未能完整考虑沿结构高度脉动风压和结构质量分布的影响,并且常作了沿水平长度风压是不变的假定,求出了风振系数,因此有了一定的偏差存在。本文按无限或有限自由度体系,根据随机振动理论,按振型分解的方法,考虑风压沿高度和长度的变化规律,求出了风振系数。根据国内外风压实测资料,求出了风振系数中有关数据。对于沿着高度其刚度和质量都比较均匀的建筑物,提出了简化公式和折算公式。有关数据已制表格,可供应用和荷载规范修订时参考。
The wind vibration coefficient of the structure under the fluctuating wind pressure is an important problem in the calculation of wind resistance of structures, especially high-rise structures. Documents such as Soviet Union, Canada, France, etc.[1][2][4][8] failed to fully consider the effects of turbulent wind pressure and structural mass distribution along structural height when determining the dynamic coefficients of fluctuating wind pressure. In addition, it is often assumed that the wind pressure along the horizontal length is constant, and the wind vibration coefficient is obtained. Therefore, there is a certain deviation. In this paper, according to the infinite or finite degree of freedom system, according to the random vibration theory, according to the vibration mode decomposition method, considering the variation law of the wind pressure along the height and length, the wind vibration coefficient is obtained. According to the measured data of wind pressure at home and abroad, the relevant data of the wind vibration coefficient was obtained. For buildings whose height and rigidity are relatively uniform, simplified formulas and conversion formulas are proposed. The relevant data has been prepared for reference when the application and load specifications are revised.