大跨度气膜煤棚风致响应及风振系数试验研究

Large-span inflatable membrane coal storage sheds are very sensitive to wind load and the fluid-structure interaction effect on such structures is obvious, so wind-induced damage accidents occur from time to time. However, the mechanism of wind-induced disaster on such structures is still not clear. Therefore, aero-elastic model wind tunnel tests of large-span inflatable membrane coal storage sheds with three typical rise-span ratios were carried out in a type B geomorphic wind field. The digital image correlation technology was used to measure the displacement and strain of the membrane surface with the test variable being the rise-span ratio, wind direction, internal pressure, wind speed and presence of cables; the strain of different cables were also measured. The wind-induced responses of the structure were analyzed. The wind vibration coefficients that consider the fluid-structure interaction effect were given. The results show that under wind load, the top of the structure deforms upward, the windward and leeward sides deform inward obviously, and the side of the structure deforms outward but not significantly. The average displacement of the windward side and the top of the structure are relatively large. The average displacement of the structure decreases obviously with the increase of the internal pressure, the increase of internal pressure, the decrease of span ratio or the application of cables. With the increase of wind speed, the internal pressure decreases obviously. The block wind vibration coefficient of displacement considering fluid-structure interaction for large-span inflatable membrane coal storage shed is between 1. 2 and 1. 3, the block wind vibration coefficient of maximum principal stress is between 1. 1 and 1. 4, and the wind vibration coefficient of stress for the cable is 1. 5.