摘要
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 functions of pipes with different lengths were determined with a pressure measurement system.Furthermore,effects of pipe length on wind pressure coefficients and wind-induced response of a flat roof were investigated without pressure correction.The results showed that a short pipe usually amplifies a fluctuating wind pressure,and a long pipe reduces it;fluctuating wind pressure diminishes significantly for a very long pipe,especially, with high frequencies;the effect of pipe length on wind-induced response is less than that of wind pressure coefficients on wind-induced response;the relationship between pipe length and calculation errors of wind pressure coefficients and wind-induced response is nonlinear and oscillatory,and the calculation error is relatively smaller for a pipe length of 100cm;the wind pressure correction is necessary for most pipe lengths.
出处
《振动与冲击》
EI
CSCD
北大核心
2014年第3期130-134,共5页
Journal of Vibration and Shock
基金
国家自然科学基金(91215302)
高等学校学科创新引智计划(B13002)
中央高校基本科研业务费专项资金(2010JBZ011)
关键词
风洞试验
频率响应函数
风压
风振响应
平屋盖
wind tunnel test
frequency response function
wind pressure
wind-induced response
flat roof
