Study On Wind Induced Performance And Field Loading Test Of The Space Rectangular Pipe Truss

The large spatial structures have developed rapidly in recent years and it is developed to the complex and lightweight because of the advantages of its high material strength,low damping and large available space.The characteristics of the large spatial structures and the complexity of the wind load make them more sensitive to wind load.And the wind field around the structure is complex with air impingement,separation,reattachment,vortex shedding and so on,so the usual assumption is no longer applicable.Because of the complexity of the large spatial structure,there is no similar appearance for reference in the load code for the design of building structures and the wind resistant design of structures is lack of sufficient guidance,therefore,the study on the wind load characteristics of large space structures is of great significance to the wind resistant design of structures.At present,the main research methods of wind load characteristics of large spatial structures are wind tunnel test and CFD numerical simulation.With the continuous development of computer technology,especially the rapid development of computational fluid mechanics,the researchers prefer the numerical wind tunnel to simulate the wind load characteristics of large special structures compared with the wind tunnel test with expensive and complicated process.Because there are few researches on the field load test of large special structure simulation wind load at home and abroad,so it is of great significance and value to carry out the field wind load test.In this paper,take the fluid module and static module in the software ANSYS as a computing platform,the numerical wind tunnel simulation and static analysis are carried out and also make the field simulation wind load test.The main research contents and conclusions are as follows:1.Take the steel roof of Liu Zhaike highway toll station as the engineering background,using the fluid analysis module CFX to build a full scale building model for the simulation of the numerical wind tunnel.At last we can obtain the wind pressure distribution and average wind pressure coefficient of roof structure under different wind directions.Through the study on characteristics of the wind load on the structure,the local shape coefficient of the Building surface zoning under the most unfavorable wind angle can be obtained.It provides reference data for the static analysis and the field load test.2.The static analysis of structural response under wind load about the steel roof of the project is analyzed with the static analysis module of ANSYS.The stress and deformation of the structure under wind load are determined,the stress variation law of the rectangular pipe truss is analyzed,and the actual stress condition of the structure is defined.The field load test research based on the static analysis has been made and a new method of field loading has been brought up and the experimental data of internal force and displacement of the structure are obtained.Compared with the static analysis and field load test,the results show that the simulation results are in good agreement with the field load tests.3.The results show that the stress values of all the measured points are in line with the experimental conditions,indicating that the structure is in the elastic range.The method can be used to provide reference for the field load test of the similar projects,and the test results can provide technical support for the normal use of the project and the later operation and maintenance.