Research On Influence Parameters Of Wind Load And Calculation Method Of Wind Vibration For Large-span Spatial Structure

In recent years,with the development of society and the improvement of science and technology,a large number of buildings with large complex structures have been emerged.As a common structural form,the large-span space structure is widely used in practical engineering because of its light weight and strange shape,but most of the spatial structures are flexible structures that are easily damaged by wind loads.Usually when designing the structure,the influence of wind load on the wind-induced vibration response of the large-span structure often becomes the main consideration.As the structural span increases and the structural form becomes more and more complex,the wind-induced vibration response of the large-span spatial structure is difficult to predict and control.However,the current load specification does not clearly define the value of the corresponding design parameters of the wind load,Including wind carrier type coefficient and wind pressure distribution on the surface of the building,etc.Therefore,it is of great practical significance to carry out research on wind-induced vibration response of large-span spatial structures.There have been many studies on wind-induced vibration response of large-span structures at home and abroad.This paper will focus on the wind load and wind-induced response of large-span space structures,and obtain the most unfavorable load conditions of structures under variable wind fields.Provide a certain reference for the anti-wind design of the cross-space structure,which are similar to domes.This paper selects the representative large-span dome structure in the space structure and studies the effects of wind field transformation on the large-span dome structure from the wind load and wind-induced vibration response of the structure surface.Firstly,the surface wind pressure distribution of the large-span dome structure under the action of the variable wind field is obtained,and then the wind-induced response is calculated.Mainly engaged in the following aspects of work:(1)The Fluent software is used to solve the calculation model,and the wind field flow and surface wind pressure coefficient distribution of the structure under different wind direction angles are obtained.It is found that the dome structure is mainly composed of vertical wind suction under wind load.When the wind direction angle is perpendicular to the large axis of the structure,the vertical wind suction is the largest,which is also the most unfavorable load condition;(2)The time domain analysis method and the frequency domain analysis method are used to calculate the horizontal and vertical displacement responses of the structure.It is found that structural displacement response is related to the wind direction angle.The vertical displacement of the central area of the structure is maximum under the oblique wind direction angle,and the maximum displacement of other areas occurs when the wind direction angle is perpendicular to the large axis of the structure;(3)Comparison of wind-induced response calculations in time domain method and frequency domain method,verify the accuracy of the algorithm and determine the most unfavorable wind field distribution of large-span dome structure,the study found that the results obtained by the two calculation methods are similar,the distribution of the displacement wind-induced vibration coefficient of the structure is relatively uniform,and the displacement wind vibration coefficient is not affected by the change of the wind direction angle,and the displacement wind vibration coefficient of the mid-span area is larger.The methods used in the research process and the conclusions obtained have certain reference value for the calculation of wind load and wind-induced response of large-span structures.