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对矢跨比分别为1/4、1/6、1/8的3个拱形屋面进行了同步测压风洞试验,分析风荷载和结构参数对平面拱形桁架风振响应和等效静风荷载的影响规律。风洞试验结果表明,0°风向时,高矢跨比屋面的最大负压幅值出现在屋顶,而低矢跨比的出现在迎风前缘。从方便工程应用的角度,采用简化振型函数表达针对结构多个位移和杆件应力响应的多目标等效静风荷载。在工程常用范围内,分析结构矢跨比、跨度、屋面质量、设计风速和风向等参数对中部和端部平面拱形桁架多目标等效静风荷载的影响,得到可用于指导该类结构抗风设计的等效静风荷载风压系数建议值,且经校核,在该等效静风荷载作用下的结构响应与实际动力响应极值吻合较好。
Simultaneous pressure wind tunnel tests were carried out on three arched roofs with quarter-to-quarter ratios of 1/4, 1/6, and 1/8 respectively. The effects of wind load and structure parameters on the wind-induced response and equivalent static response of flat arch truss The influence of wind load. Wind tunnel test results show that at 0 ° wind direction, the maximum negative pressure amplitude of high-rise-span is higher than that of the roof, while the low-rise-span ratio appears at the front of windward. From the point of view of convenience of engineering application, a simplified mode shape function is used to express the multi-objective equivalent static wind load for structural multiple displacements and rod stress responses. In the common range of engineering, the influences of the ratio of span to span, span, roof quality, design wind speed and wind direction on the multi-objective equivalent static wind load of central and end planar arched truss are analyzed. Equivalent static wind load wind pressure design wind pressure coefficient suggested values, and after checking, the equivalent static wind load under the structural response and the actual dynamic response of the extreme agreement is good.