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大跨、高柔结构对风荷载非常敏感,针对此类结构风效应的研究是非常有必要的。基于高频测力天平节段模型风洞试验,测得不同风向角下,封闭式输煤栈桥各典型支撑塔柱及栈桥桥面两个水平向的基底弯矩和剪力。并通过模型基底力平均值计算并分析了各典型支撑塔柱及栈桥桥面体型系数,得到了体型系数随风向角的变化规律。将体型系数试验值与规范值比较,结果表明二者吻合较好,验证了本试验的可靠性,也说明按照规范进行输煤栈桥抗风设计是合理的。分析了周边建筑物对输煤栈桥风荷载的干扰效应,提出了干扰修正系数,为该建筑物基底弯矩和剪力验算以及结构抗风设计提供依据。
Long-span, high-flexural structures are very sensitive to wind loads. It is very necessary to study the wind effect of such structures. Based on the wind tunnel test of the high-frequency dynamometer scale section model, the bending moments and shear forces of two horizontal bases of the typical support pylons and trestle decks of closed-type coal conveyance trestle at different wind angles were measured. The body shape coefficient of each typical tower and bridge deck is calculated and analyzed by the model base force average value, and the change rule of body shape coefficient with wind direction angle is obtained. The result of comparison between the body coefficient test value and the standard value shows the good agreement between the two, which verifies the reliability of the test and also shows that it is reasonable to design wind-resistant design of the coal trestle in accordance with the regulation. The interference effect of the surrounding buildings on the wind load on the coal trestle bridge is analyzed. The correction coefficient of the disturbance is proposed to provide the basis for the calculation of the foundation moment and shear force of the building and the wind-resistant design of the structure.