测压管道系统频响函数及对风效应的影响

利用管道测压试验,确定不同长度测压管的频率响应函数。在此基础上,研究不考虑管道系统修正时,测压管道长度对平屋面风压系数和结构风振响应均方根和极值的影响规律。研究结果表明:短管对脉动风压有放大效应,长管则呈现缩小效应;当管道长度较大时,风压信号衰减十分显著,尤其在高频位置;管道长度对风振响应的影响小于屋面风压系数,误差影响规律差别较大;测压管道长度对风压系数和风振响应计算误差的影响呈现振荡特性,100 cm左右管道长度引起的误差相对较小,对于大多数管道长度,均需要进行风压管道修正。

Frequency response transfer function of pressure measurement pipe system and its effect on structural wind effects

The frequency response transfer function of different pipe lengths is determined with the pressure measurement system. Furthermore, effects of the pipe length on wind pressure coefficients and wind-induced response on a flat roof are investigated without the pressure correction. The results show that a short pipe usually amplifies the fluctuating wind pressure, and a long pipe reduces the pressure. Fluctuating wind pressure diminishes significantly with a very long pipe, especially at the high frequency; the effect of the pipe length on wind-induced response is less than that on wind pressure coefficients on the roof; the relationship between the pipe length and the calculation errors of wind pressure coefficients and wind-induced response is nonlinear and oscillating, and the calculation error is relatively smaller for the pipe length around 100cm; the wind pressure correction is necessary for most pipe lengths.