Numerical Simulation For The Effect Of Parapets On Wind Pressures Of Low-rise Buildings' Roof

In recent years, the typhoon happens frequently in china,and it appears to increase progressively year by year. Cladding failure of a great large number of low-rise buildings has occurred after the wind disaster. The failure often happens due to roof cladding failure. The explanation of this phenomenon is that some roof cladding zones susceptible to wind load have not been strengthened to resist wind load. When the typhoon makes a surprise attack on the low-rise buildings, those zones failure happens ahead of the whole cladding failure caused by roof cladding failure. No corresponding provisions have been proposed to improve the capability of wind resistance by the optimization of construction configurations on the roof cladding in china. So to meet the design of wind resistance, the optimization of construction configurations on the roof cladding with low-rise buildings has a very important realistic significance.On the basis of summarizing main research results, some numerical simulations have been carried out for wind pressures acting on low-rise buildings with continuous solid parapet,solid parapet with raised corner and cantilevered parapet in this paper. Firstly, some common questions in numerical simulation have been summarized. Secondly, numerical simulations have been carried out with classical full-scale cube model. The simulation results have a good coincidence with that of both full-scale and wind tunnel testing. It validates that the model is correct. On the basis of that, numerical simulations have been carried out on full-scale cube model with three types of parapets. The caparison of with and without parapets shows that three types of parapets can significantly reduce high negative suction peaks on zones susceptible to wind pressure. Formulas have been proposed about the height of those parapets. Finally, with caparisons of that three parapets′properties cantilevered parapets has been adopt to the steel structure of light-weight buildings with gabled frames, numerical simulations have been carried out with that buildings, results of simulations show that device can also significantly reduce the area-averaged coefficient of wind pressure and high negative suction peaks on zones susceptible to wind pressure. Formula has been proposed about the height of that parapet. These formulas can provide reference for both the theoretical guide for wind tunnel testing in the near future and choosing the roof cladding local are-averaged coefficient of wind pressure for the designers.