Numerical Simulation Of Wind Vibration Response On Large Span Steel-truss Roof With Cantilevers

With the development economy and progress of science and technology, large-spanstructures, obtained a rapid development, more and more large-span structures havebeen built, which have individual characteristics in architecture and structure. Thelarge-span structure has good mechanical properties and the architectural modeling isbeautiful, which has been more widely used, with the requirement of large space, thespan of structure is increasing, coupled with the joining of lightweight materials, thestructure is more sensitive to the wind load, and thus the wind load is one of the controlloads to the structural design. Different from the high-rise buildings, the design theoryand methods of wind to large-span structures are still at the exploratory stage, it isnecessary to study the wind load characteristics detailed of the large-span structuresusing the existing means, and to explore the efficient calculation method of thewind-induced vibration response that is applicable to the large-span structures.In this paper, taking the stadium in Chongqing as the engineering background,finite element model is established, the numerical simulation is carried out by thesoftware platform of FLUENT, combined with the results of wind tunnel model test,analyzed the distribution characteristics of the average wind pressure coefficient on thestadium canopy structures; based on the frequency-domain method, analysis ofwind-induced vibration is operated on structure under the different wind angles by usingthe software ANSYS, the accomplishments of this paper air as follows:①Combined with the wind tunnel model test of the stadium in Chongqing, firstintroduced the equipment of wind tunnel model test and the simulation techniques ofatmospheric boundary layer, then describes the pressure test method on the constructionmodel and the point of environment test, and the method to process experimental data isgiven;②Based on the theory of computational fluid dynamics (CFD), using theRNG k in software FLUENT, combined with the stadium in Chongqing, numericalmodel is established and calculated, by comparing with the wind tunnel test, the resultsare the same basically, verified the feasibility and accuracy of numerical wind tunnelsimulation.③The numerical simulation is carried out under different wind angles, the resultsshow that the roof was mostly negative pressure distribution in all wind directions, the greatest negative pressure is on top of the stadium roof in the windward area, thelocation of greatest negative pressure is changed with the wind angles, by comparingwith the wind tunnel test data, for the further understanding distribution characteristic ofthe average pressure on the open cantilevered structures.④Established finite element model of the stadium structure, studied theself-vibration characteristics of large-span cantilevered structures by the finite elementmethod, analyzed the average wind-induced response under different wind angles, todiscuss the distribution regularity of the vertical displacement.⑤Considering the effects to mean square deviation of structure verticaldisplacement by the different vibration mode number, the number of the combinedmodes in the structural vibration analysis is recommended, based on frequency-domainmethod, Random vibration (PSD) analysis of the stadium roof is operated under thedifferent wind angles by using the software ANSYS, the wind displacement vibrationcoefficient is calculated, and summarized the characteristics of wind-induced vibrationresponse.