發(fā)布時(shí)間：2019-08-03 06:45

【摘要】：由于高層建筑阻尼小、頻率低,易在風(fēng)荷載作用下發(fā)生明顯的氣動(dòng)彈性效應(yīng),出現(xiàn)不可忽略的氣動(dòng)負(fù)阻尼比。為此,考慮高層建筑的一階線性彎曲模態(tài),制作了長寬比2∶1的矩形截面高層建筑的單自由度氣動(dòng)彈性模型,模型比例1/600。進(jìn)行了全風(fēng)向下氣彈模型風(fēng)洞試驗(yàn),每個(gè)風(fēng)向測量了10個(gè)試驗(yàn)風(fēng)速下的建筑頂部加速度響應(yīng),并采用隨機(jī)減量方法,對矩形截面高層建筑氣動(dòng)阻尼比進(jìn)行識(shí)別。研究結(jié)果表明:對于長寬比2∶1的矩形截面高層建筑,強(qiáng)軸方向的風(fēng)致加速度響應(yīng)遠(yuǎn)大于弱軸方向;兩個(gè)主軸方向的順風(fēng)向氣動(dòng)阻尼比均為正值,但強(qiáng)軸方向的橫風(fēng)向氣動(dòng)阻尼比為負(fù)值,無量綱臨界風(fēng)速約為5.5;僅采用橫風(fēng)向氣動(dòng)阻尼比結(jié)果,可以很好地反映全風(fēng)向的氣動(dòng)阻尼特性。
[Abstract]:Because of the small damping and low frequency of high-rise buildings, it is easy to have obvious Aeroelastic effect under wind load, and there is a negative pneumatic damping ratio that can not be ignored. For this reason, considering the first order linear bending mode of high-rise building, the single-degree-of-freedom Aeroelastic model of rectangular section high-rise building with length-to-width ratio of 2:1 is made, and the ratio of the model is 1 鈮，

本文編號(hào)：2522401