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弦支筒殼結(jié)構(gòu)風(fēng)致響應(yīng)分析
喬文濤,陳志華
摘 要

(天津大學(xué)建筑工程學(xué)院,天津 300072)
[摘要]弦支筒殼的自振頻率分布密集,且基頻較低,可能會與脈動風(fēng)的周期相近,故受脈動風(fēng)影響會較大,其主要貢獻模態(tài)往往分布在前數(shù)十階,以動力學(xué)計算為基礎(chǔ)的時域分析法能較好地計算此類結(jié)構(gòu)的風(fēng)振響應(yīng)。以一實際工程為例,采用線性自回歸濾波法(AR)模擬隨機脈動風(fēng)速時程,進行時域分析,研究表明,脈動風(fēng)對結(jié)構(gòu)豎向位移影響較大,風(fēng)振系數(shù)可取1.6;對結(jié)構(gòu)橫向位移影響較小,風(fēng)振系數(shù)可取1.3;對縱向位移影響最小,風(fēng)振系數(shù)可取1.15。
[關(guān)鍵詞]柱面網(wǎng)殼;弦支筒殼;風(fēng)振響應(yīng);AR法;風(fēng)振系數(shù)
Analysis on wind-induced vibration response of cable supported barrel vault structures
Qiao Wentao, Chen Zhihua(School of Civil Engineering, Tianjin University, Tianjin 300072, China)
Abstract: The self-vibration frequencies of cable supported barrel vault structures are very close to one another and the first –self-vibration- frequency is low. The periods of structure may be very close to the periods of the fluctuating wind, so the influence of the fluctuating wind on the structure is often great. The main contribution mode is the first tens of modes and the wind-induced vibration response of the cable supported barrel vault will be well calculated by time domain analysis method based on dynamic calculation. Taking a practical project for example, the linear auto-regressive filtration (AR) method was used to simulate the fluctuating wind, and the time domain analysis was carried out. The result indicates that the influence of the fluctuating wind on vertical displacement of the cable supported barrel vault is great, and the wind-induced vibration coefficient is 1.6. The influence on transverse displacement is small, and the wind-induced vibration coefficient is 1.3. The influence on longitudinal displacement is smaller, and the wind-induced vibration coefficient is 1.15.
Keywords: cylindrical latticed shell; cable supported barrel vault; wind-induced vibration response; AR method; wind-induced vibration coefficient
國家自然科學(xué)基金(50778122),新世紀(jì)優(yōu)秀人才支持計劃(NCET)。
作者簡介:喬文濤,博士,Email:tottyer@126.com。
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