Equivalent Static Wind Load Of Long-Span Roof Structures Based On Resilience

The large-span roof structures have been widely used in various types of public buildings with its novel and beautiful shape,large internal space,etc.However,the growing demand has led to the continuous development of large-span roof structures into lightening and elongating,which increases the sensitivity of wind.In addition,due to the complexity of the wind-induced response of long-span roof structures,the equivalent static wind load for single target is difficult to take multiple targets into account.In view of the above problems,this paper combines the current research status of wind resistance of large-span roof structures,completing the following work:(1)Taking the main tennis court project of the Xiamen Olympic Tennis Center as the background,the synchronous pressure-measuring wind tunnel test of the rigid model is introduced.According to the average wind pressure coefficient obtained from the experiment,it can be inferred that the wind loads on long-span roof structures are dominated by suction.In general,the most unfavorable wind load distribution occurs at geometric mutations such as the roof edge or comers because of the flow separation,which should be emphasized in design.(2)Through the theoretical derivations and analysis of examples,this paper elaborates the current methods of wind-response calculation,which can be divided into time domain and frequency domain.The analysis results show that not only the number of required vibration modes is large,but also the neglect of cross terms between modes will result in larger errors on account of the dense distribution of modes of large-span roof structures.Besides,the distribution of the background component and the resonance component in the structural response can be adjusted by selecting the value of the analysis parameters(such as the damping ratio),so that it can be adapted to the wind-resistance type of large-span roof structures.(3)Aiming at the existing problems in the research of the equivalent static wind load of the long-span roof structure,this paper proposes a multi-target equivalent static wind load based on the resilience.Comparing the traditional equivalent static wind load for single target,the multi-target equivalent static wind load calculated by this method has a definite physical meaning.By taking the corresponding measures,it can not only take different types of responses into account,but can also ensure the accuracy of key responses while rationalizing the distribution of ESWL,which can be used in practical project.