基于测力天平风洞试验的大跨封闭式输煤栈桥风荷载分析  

Analysis of Wind Loads on Long-span Closed Coal Belt-conveyor Gallery Based on Wind Tunnel Force Balance Tests

作　　者：王述良[1] 梁枢果[1] 邹良浩[1] 周向阳 王磊[1] 

机构地区：[1]武汉大学土木建筑工程学院,430072 [2]广东电力设计研究院,广州510663

出　　处：《特种结构》2013年第6期42-47,共6页Special Structures

摘　　要：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。Structures with long span and high flexibility are very sensitive to the wind forces,so it is necessary to study on the wind effects on such structures.In this paper,based on section model wind tunnel high-frequency force balances test,two horizontal base bending moments and shear forces of the typical supporting columns as well the bridge of the closed coal belt-conveyor gallery under different wind directions were measured.The shape coefficients and their variations with the wind directions of the typical supporting columns as well as the gallery were calculated then analyzed by the mean values of base forces.The experimental values of the shape coefficients were compared with those in the Chinese Load code,the results shown that they were in good agreement,which verified the reliability of the test,and also illustrated that wind-resistant design of the coal belt-conveyor gallery in accordance with the code was reasonable.Based on analysis of the variances of base forces between entire model with and without surrounding buildings,influences of surroundings buildings were studied.Interference factors were proposed to provid the basis for the base forces checking and wind-resistant design of the long-span closed coal belt-conveyor gallery structures.

关 键 词：大跨封闭式输煤栈桥 测力天平风洞试验 体型系数 干扰效应 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]