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以球壳型大跨度屋面为研究对象,进行雷暴冲击风作用下的刚性模型风洞试验。按照相似准则制作了不同类型球壳型屋面模型,利用射流装置、粗糙元等模拟了雷暴冲击风流场,研究了失跨比、高跨比及同一矢跨比下的跨度等结构参数以及屋面所处流场位置的变化对冲击风作用下屋面的风压极值位置及其数值大小、气流分离点位置等的影响。试验结果与CFD数值模拟结果的对比验证了试验装置及测试的可靠性。参数敏感性分析表明:球壳型屋面在风场中所处位置及屋面矢跨比对屋面表面正负风压的转变、极值风压位置及其数值等风压分布特征的影响较大;高跨比及一定范围内屋面跨度变化的影响主要体现在迎风面;屋面中心越接近射流中心,冲击风竖向风压的作用越明显。
Taking the spherical shell long-span roof as the research object, the rigid model wind tunnel test under the action of thunderstorm impact wind was carried out. According to the similarity criterion, different types of spherical shell roofing model were fabricated. The jet flow field and roughness element were used to simulate the thunderstorm impacting wind field. The structural parameters such as span ratio, span ratio and span ratio at the same span ratio, The change of the position of the flow field affects the extreme position of the wind pressure and the value of the air pressure under the impact of the impact wind, the position of the airflow separation point and the like. The comparison between the test results and the CFD numerical simulation results verifies the reliability of the test equipment and test. The analysis of parameter sensitivity shows that the location of the spherical shell roof in the wind field and the roof-span ratio of the roof have a greater influence on the distribution of positive and negative wind pressure on the roof surface, the location and value of extreme pressure wind pressure, The influence of high span ratio and roof span variation within a certain range is mainly reflected in the windward surface. The closer the roof center to the jet center, the more obvious the impact of vertical wind pressure of impact wind.