Numerical Simulation On Wind Loads On Typical Civil Engineering Structures

Typhoons hit coastal areas of our country frequently. With global warming, climate changes more and more abnormally and typhoon frequency and intensity increase. Therefore, the research on high-rise surface wind pressure and wind load character of low houses in costal area is very significant to reduce damage caused by typhoons in costal areas in the country and maintain a good momentum of growthin the national economy.Firstly,in this paper, the author uses CFX software platform to build the modal of Tianjin Gaoyin 117 according to its actual size and adopts RNG k ?εturbulence model to do numerical simulation for mean basal load and surface wind pressure. And compared with wind tunnel experiment,they agree well. At the same time, flow field information was displayed conveniently by numerical simulation, which does mechanism analysis to wind pressure distributions. It is needed to point out that there are obvious flow separation, big regional wind pressure and fierce wind pressure gradient change in edges are evident and near to the windward. Thus precautionary measures should be taken when palisade structure is designed.Secondly, the author simulates the average wind pressure of roof numerically, which aims at typical low houses with double slopes in costal area of Guangdong province. Then the author compares its numerical simulation with wind tunnel experiment and verifies that it is right to use numerical simulation in research on low houses. The paper studies how ridge and fastigium and their sizes affect the average wind pressure of roof and the author simulates the disturbed effect between two parallel roofs with two slopes numerically and does wind tunnel experiment, which are the most typical in group low buildings. The results show that the edge and ridge has great negative pressure and building ridge and fastigium made of concrete on the roof is a effective way for wind resistance of roof because the concrete has greater dead weight which results in the fluid gathering into the ridge and fastigium where the fluid separates and the absolute value of the negative pressure of the roof going down. The changing of the height of ridge effects wind pressure of the whole roof to some degree but depends on wind directions. Wind pressure of the whole roof is affected most when wind is perpendicular to ridge and it is affected least when wind is parallel to ridge. When two low houses with double slopes are built in parallel there has obvious disturbed effect and different parts have different disturbed effects. The biggest roofing negative pressure disturbance reaches 1.38 and the disturbed effect goes down with the distance broadening between the two parallel houses. Analyzing wind vector by numerical simulation, it can be found that the disturbance effect has a tendency to disappear when the two low houses are built in the biggest parallel distance.