三并列方柱风荷载特性的试验研究

研究了三并列正方形截面柱体在不同地貌下的动态风荷载和局部风压分布特性。结果显示，对称并列布置的两个柱体可以显著地干扰并增大被扰结构的动力荷载，在B类地貌下且间距比为3．2时，可以使横风向和顺风向响应基底弯矩的干扰因子分别增至4．56和1．36，并且并列三柱体间的干扰效应明显高于双柱体并列的情况。在B类地貌下，三柱体配置的横风向和顺风向响应基底弯矩的干扰因子值要比相应双柱体并列布置的分别高出109％和6％。粗糙化地貌的高湍流度气流对结构的旋涡脱落有明显的干扰作用，故在高湍流度流场，相应的干扰因子大大降低，但在D类地貌中，试验观测到的横风向和顺风向响应基底弯矩的干扰因子仍分别有1．66和1．12。

Experimental Study of Wind Load on Three Square Prisms of Side-by-Side Arrangements

Dynamical interference effects among three prisms in side by side arrangements were investigated. The results show that the dynamical wind load on the tested prism can be disturbed and enhanced by existence of the adjacent prisms arranged side by side. The tested dynamical interference factor (IF) can be up to 4 56 across wind and 1 36 along wind respectively in exposure category B. The results also show that the interference effects among three prisms are more significant than those between two prisms, and the tested IF among three prisms, in exposure category B, has a respective increase of 109% across wind and 6% along wind over those between two prisms. Because the higher turbulence flow disturbs the generation of the vortices and reduces the strength of the shedding vortices, the measured IFs in exposure category D are much smaller than those measured in exposure category B. However, the observed IFs are still found up to 1 66 across wind and 1 12 along wind in exposure category D.