双子塔气动力及其相关性对间距的敏感度研究

Sensitivity of twin-tower’s aerodynamic forces and their correlation to spacing

超高层双子塔的气动干扰和荷载相关性是描述其风荷载并进行抗风优化的重要参数,而双塔之间的间距对这两个特性有重要影响。利用同步测压的风洞试验方法,确定不同风向下双子塔上的风荷载与双塔相邻间距大小之间的函数关系,之后借助相关系数和相干函数分别在时域和频域中研究了不同间距下风荷载的相关性。结果表明:在大多数情况下,随着双塔之间间距的减小,每个塔上的风荷载尤其是横风向脉动荷载趋于减小;双塔横风向脉动荷载在多个间距下表现为负相关关系,该负相关性在双塔沿风向前后排列时更为明显。所得研究结果揭示了间距的选取在双子塔抗风优化中的重要作用,并对连体的设计具有指导意义。

Aerodynamic interference and load correlation between twin-tower are important parameters to describe wind loads and do wind-resistant optimization,and the spacing between twin-tower has important effects on these parameters.Here,using the synchronous pressure integration(SPI)method,wind tunnel tests were performed to determine the function relationship between aerodynamic forces on twin-tower under conditions of different wind directions and spacing.Wind load correlations under different spacings were studied in time domain and frequency one,respectively by means of correlation coefficient and coherence function.Results indicated that in most cases,with decrease in spacing,wind load on each tower,in particular,cross wind fluctuating load tends to decrease;cross wind loads on twin-tower under multiple spacings reveal negative correlation,the negative correlation is more obvious when the twin towers are arranged forward and backward along wind direction;the selection of spacing plays an important role in twin-tower’s wind resistance optimization,and has a guiding significance for the design of conjoined body.