大跨索屋盖结构风振动力响应复杂，传统采用等效静力风荷载计算其风致振动响应的适用性一直是当前大跨结构研究的热点。针对下凹型(单层马鞍形索网)和上凸型(轮辐式双层索网、索穹顶、弦支穹顶)四类典型大跨索屋盖结构，以四类结构风洞试验测试数据为基础，结合最近邻点插值方法研究提出了基于节点动力风荷载(模式一)和面组分区动力风荷载(模式二)两种荷载取值计算模式及其计算流程，并与传统基于等效静力风荷载的取值计算模式(模式三)进行对比，在四种不利风向角下探究四类典型索屋盖采用三种荷载取值模式时的风致振动响应。结果表明，基于模式一与模式二计算得到的索屋盖结构风振响应均较模式三要高，采用节点风荷载的取值计算模式一能更为精确地反映屋盖结构实际承担的风荷载，有效表征屋盖结构的实际风振响应；在上下游均无临近场馆影响下，下凹型和上凸型索屋盖的平均和脉动风振位移响应云图总体分布规律较为一致，但响应大小变化规律不一，下凹型呈现中间大、周边小的逐渐递减的规律，而上凸型屋盖呈现中心区域小、中间环带大、周边再次下降的变化规律。
Abstract
The wind-induced vibration response of long-span cable roof structures is complicated. Currently, one of the research focus is the applicability of the traditional equivalent static wind loads to calculate the wind-induced vibration response of long-span cable roof structures. This research focuses on four types of typical long-span cable roof structures: the concave type (the single-layer saddle-shaped cable net) and the convex types (the spoke-type double-layer cable net, the cable dome, and the string-supported dome), and all of them are tested by wind tunnel tests. Based on these data, two load value calculation modes and calculation procedures are proposed for the node dynamic wind load (Mode 1) and the area group dynamic wind load (Mode 2) by the nearest neighbor interpolation method, and are compared to the traditional equivalent static wind loads (Mode 3). The wind-induced vibration responses of four types of the typical cable roofs are studied with three different load value modes under four unfavorable wind direction angles. The results show that the wind vibration responses of the cable roof structure calculated based on Mode 1 and Mode 2 are respectively higher than that of Mode 3. In addition, it is more accurate to calculate the value of the node wind load of Mode 1, which reflects the actual wind load of the roof structure and effectively represents the actual wind-induced response of the roof structure. Furthermore, under the influence of no adjacent venues on the upstream and downstream, the average and fluctuating wind-induced displacement response cloud patterns of the concave and the convex cable roofs are relatively consistent, but their response sizes vary. The wind-induced displacement of the concave roof shows the tendency of gradually decreasing from the middle to the periphery, while the wind-induced displacement of the convex roof tends to increase from the central area to the middle ring and then reduce to the periphery.
关键词
索屋盖 /
风荷载 /
取值模式 /
风振响应 /
风振系数
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Key words
cable roof /
wind load /
value mode /
wind vibration response /
wind coefficient
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