低矮房屋屋面实测峰值风压分析

A full-scale moveable instrumented low-rise building was constructed and implemented to measure the wind velocity and the associated building surface pressures during typhoon landfalls. The major objective of the field study was to further understand the typhoon-generated wind characteristics and the wind effects on the low-rise building under extreme wind conditions. Based on the pressure data measured on a roof corner of the experimented building during the 0801 typhoon Neoguri, it was shown that high local suctions were observed under the oblique flows, the pressure distribution and the cross-correlation coefficients between various taps of a roof corner area. The observed minimal pressure-coefficients were higher than those recommended for the design of the corner zone by current design building codes. The Generalized Extreme Value (GEV) distributions were used to fit the peak suction pressure coefficients, and it was found that the Type III Extreme Value distribution matched the data well. It was revealed that the predicted upper limits of the peak pressure coefficients were more than 20% higher in magnitude than the highest values actually measured. Compared with those obtained under non-typhoon wind climates, the corner section of the roof experienced higher local suctions during typhoons.