Computational Simulation Of Wind-induced Internal Pressure And Roof’s Dynamic Response Of Structure With Openings

Opening building refers to the structure with wall openings itself or due to destroyof windows or doors during gale, as well as the building is still in an unsealed stateduring the construction period. So when we determine the design value of wind load,not only the external pressure but also the combined actions of internal and externalpressures should be considered during the design of these buildings. An overseainvestigation of windstorm disaster shows the loss caused by damage of low-risebuildings accounted for more than50%of the global loss caused by wind disaster everyyear, the domestic investigation indicates the same results in this years. They also foundthat the most serious and highest frequency destroyed part of buildings is the envelopeand roofing system.The research about internal pressure is still in exploratory stage currently, and theload codes of different countries didn’t clearly define the value of internal pressure, sothe combined actions of internal and external pressures is a serious threat to security ofthe opening building, especially to the large span, light and low-rise structures. So theprofound investigation of the wind-induced internal pressure and the response ofstructures by exter-inter wind pressure combined action have vital academicsignificance and engineering value.Benefit from the development of numerical simulation theory and hard-software ofcomputer, as well as its obvious predominance compared with the traditional methodsof structure wind engineering, Computational Fluid Dynamics (CFD) is having beenregarded for and been applied in lots of regions in over40years. This paper introducedthe basic theory of CFD, and then verified the feasibility of numerical simulationmethod in studying wind-induced internal pressure through the trial of numericalsimulation to the TTU field measurement model. On this basis, numerical simulationsof rigid structural model were carried out to investigate the mean internal pressure at thestage of steady-state flow of typical gable roof plant with openings, the effects of factorssuch as the number of openings, opening ratio and location, wind attack angle tointernal pressures were mainly checked. Comparative analyses of pressure distributionbetween opening and sealed buildings, and the adverse impact of the inter-exterpressure combined action to structures were also carried out.Then, coupling numerical simulations of aero-elastic structural model with onemain opening on the windward wall were carried out to study the response of the flat roof and the coupling effect of the flexible roof and wind loads. The roof’s responses ofopening and sealed buildings were compared in order to analyze the effects to theresponse of roof; the factors include windward velocity, opening ratio and roof stiffness.In addition, the displacement wind vibration coefficient ratio of opening models andsealed model were studied in this part.Finally, a large number of simulations were carried out to study the wind loaddistribution of industrial buildings during construction and the mechanism ofwind-induced collapse, recommendations on the construction sequence and somenecessary measures were put forwarded.