Research On The Bearing Wind Load Characteristic Of The Huge Space Truss System

The mechanism of the functionary generated by the wind load which acting on the large span spacial structure is very complexity.lt is very important that we should do some meticulous research on the counteracting wind load towards this kind of light and large poise roof cover structural system. On the basis of the design and calculation of such space truss system ,this paper has analysed and summed up the experiment dataes of the wind tunnel test and made a deeply research and analysis on this kind of structure which undergoing complicated wind load. Compare the wind load values which gained by calculating according to load criterion and the wind tunnel test separately and then analyze and compare the two different results got by static wind load and dynamatic ones separately.At last,analyze the two outcomes through these two different methods which in virtue of finite element program MIDAS.In this paper we do the rigidity model wind tunnel test in the Arch&Sci Academe in GuangDong provience to get some datas to apply on the design of the space truss. Then figure out the wind load in term of the load criterion and the wind tunnel test results separately .By comparing with the two results,we can draw a conclusion that the values which generated by the load criterion are bigger than these ones generated by the other.In order to calculate and design in the worst situation,the paper select the bigger basic wind stress and then turn the area-load into liner-load to receive the displacement of the nodes and the internal force of the cells generated by the static wind load.According to the frndamental and the steps of this method,we cans use the linear regress filter method to make the simulation of the wind load and then we can educe the curve of the time-process wind velocity. After that step,we can get the chart of the dynamic wind load whichwe can deliver the crosswind into the particle wind load and put them on the corresponding cell nodes.Then we can do the analysis of the dynamical wind load through the time-process analysis to get the max value of the displacement.Choose two nodes on the edge of the structural to compare the results calculating by the finite element program MIDAS,then we can draw a conclusion that these kinds of space truss systems is sensitive to the libration of the dynamic wind loads.To consider this factor is very necessary in the process of design,we will use the pulsant augmentation coefficient to realize it.