Experimental Study On Wind Load And Load Response Characteristics Of Long-Span Cylindrical Reticulated Shell Structures

Long-span cylindrical reticulated shell structure has been widely used in China's production and life for its advantages of large space,fast construction speed,material and cost saving.As its span is usually larger,its mass is lighter,and its overall stiffness is smaller,it is very sensitive to the action of the wind.However,due to the variety of such structures,there is a lack of clear design parameters for such structures in the current specification.Wind tunnel test simulation to determine the structure of the wind load is a more reliable method.It is of practical significance to analyze the distribution law of structural wind load and further analyze the law of structural wind load response by using the data obtained from the test.In this paper,the large-span storage greenhouse proposed for a project is taken as the research object,the experimental model is designed,and the wind tunnel pressure test is carried out.Firstly,the characteristics of wind load of the structure were studied,and then the response characteristics of the structure under wind load were analyzed.Finally,reasonable Suggestions were put forward for the design of wind load of the structure.The specific research contents and conclusions are as follows:(1)Considering to flow direction of large-span cylindrical reticulated shell shape coefficient,the influence of the structure surface under typical wind direction Angle of wind load distribution in the typical regions monitoring locations and shape coefficient of wind direction Angle change law were analyzed,and the results show that the direction of the wind along the axis model,the coefficient of size for showing a good symmetry,gable wall and ceiling shape coefficient are near to the side is bigger,gable,roughly windward side by wind pressure,leeward side wind suction,ceiling are basic wind suction.(2)The natural vibration characteristics were analyzed,and basic structure of each measuring point displacement response is obtained by calculating the mean and fluctuating value and analysis of four typical wind direction Angle of the distribution of the structural displacement response under the contour map,and select the longitudinal point and transverse point five rows and five columns of four typicalposition measuring point,the average displacement and displacement of typical regional monitoring locations of fluctuating value were analyzed,and the last of four typical wind direction Angle of the structure under wind vibration coefficient is analyzed,the results show that the same average location of the measuring point displacement and fluctuating values have the same change trend;When the wind direction Angle is 0° and 90°,the distribution of the wind vibration coefficient is relatively uniform;when the wind direction Angle is 180° and 270°,the distribution of the wind vibration coefficient is relatively complicated;when the wind direction Angle is 90°,the wind vibration coefficient of the structure is generally smaller than the other three cases.(3)According to the wind tunnel test results,reasonable Suggestions for structural wind load design are given,and the size coefficient of similar size in the code is compared with the size coefficient on the roof obtained in the test.