Wind Loading Characteristic of Lowrise Buildings Roof with LShape Plan

Abstract:

Rigid model pressure measurement tests of lowrise buildings with Lshape plan were conducted in TJ2 wind tunnel laboratory,the pressure time histories probability distribution was discussed firstly.The experimental results reveal that the skewnesses of most regions pressure time histories of the roof are large,and the probability distribution is well fitted by the threeparameter gamma distribution,consequently,the SadekSimiu procedure is preferred to estimate the peak pressure coefficients,and compared with such method,the traditional Gaussian method tends to be unsafe.Then the effects on roof wind loadings of wing length,roof pitch and the roof combination form were studied.The results show that the increasing of the wing length or the decreasing of the roof pitch intensifies the negative mean pressure and the worst negative peak pressure,however,the negative mean pressure and the worst negative peak pressure on gablehip combined roof are much smaller than that on twogable combined roof,thus the conclusion is drawn that the gablehip combined roof is superior to twogable combined roof in wind resistance.

Key words:Lshape plan; lowrise buildings; wind loads; skewness; wing length; roof combination form