Research On Partition Design Wind Load Of Large-span Roof

The large span roof structure represented by the sphere,the cylinder and the saddle is more and more widely used.Because this kind of structure is sensitive to the wind-load,wind-resistant design is particularly important.However,due to the complex surfacewind-load characteristics of large-span roofs,the need to consider the effects of multiple vibrations and the difficulties in determining the equivalent static wind loads for windinduced vibration of structures,there is no unified and concise method for determining wind loads for large-span roof designs.However,the proposed value of the wind load shape factors given in the current “Load Code for Building Structures” has limitations,and the calculation method for the wind load standard value of the main structure through the wind-induced vibration coefficient proposed for high-rise and high-rise structures may not be applicable to large-span roofs.In structural wind design,the equivalent static wind load is often used to characterize the effect of wind loads on the structure.In order to facilitate the calculation,the equivalent static wind load is generally given in the form of a partition.The purpose of this paper is to give a method for determining the wind load of the zonal design of common spherical,cylindrical,saddle-shaped roof structures.The following work was performed on the basis of the expression of the equivalent static wind load for the dynamic amplification effect of the wind load by gust response envelope approach for the equivalent static wind load using the average wind load and the fluctuating wind load as the basis vectors and the wind-induced vibration effect coefficients.1.the principle of partitioning the average wind load on the surface of large-span roofs is discussed,a method of partitioning the average wind load based on the K-means clustering analysis method is established,and a partitioning program for wind loads is compiled by MATLAB;2.Obtained by using the wind load zoning program to process a large number of wind tunnel test data,regions shape factor of mean wind load and fluctuating wind load of sphere,cylinder,and saddle roof under different rise-to-span ratios,height-to-span ratios,wind directions are basis of the value of the base vector of the equivalent static wind load.3.Based on the expression of the equivalent static wind load obtained by the extreme response envelope method,a parametric wind-induced vibration analysis of a large number of spherical,cylindrical,saddle-shaped roof reticulated shell structures was performed,and the fitting formula of the wind-induced vibration effect coefficients under different working conditions was obtained.Finally,the equivalent static wind load recommendation is given.The effectiveness of equivalent static wind load is verified by comparing the static response of wind vibration response with that of dynamic analysis.