外形几何参数对双坡屋盖升力系数极值的影响

Effects of Geometrical Parameters on Extreme Uplift Force Coefficients on Gableroofs of New Rural Lowrise Buildings

摘要:

对我国浙江沿海多个风灾频发区域进行深入调研,全面地确定了新农村典型低矮建筑双坡屋盖的外形几何参数.基于此进行了刚性模型测压风洞试验,研究了屋盖升力系数极值的变化规律,讨论了最不利屋盖升力系数随建筑外形几何参数的变化,用多参数非线性最小二乘法将最不利屋盖升力系数拟合为屋盖坡角、高宽比和厚宽比的函数,并对拟合函数进行了误差分析.这些结论及拟合函数对于新农村低矮建筑的结构设计及相关规范手册的制订提供了系统的参考数据.

Abstract:

By investigating into the areas in Zhejiang Province of China where wind disaster happens frequently, the geometrical parameters of the new rural lowrise buildings are obtained comprehensively. Based on the information, the windtunnel pressure tests for rigid models of such buildings are done. The law of the extreme uplift force coefficients on the roofs is studied. The effects of geometrical parameters on the most unfavorable uplift force coefficients on the gable roofs are given and then fitted as a function of roof pitches, aspect ratios and side ratios with the multiparametrical leastsquares method. The error analysis is made to assess the rationality of the result. These conclusions and the fitted function are useful references for wind loads standards and structure design of new rural lowrise buildings.