tall building spatial correlation mathematical model rigid m
本文關(guān)鍵詞:超高層建筑層風(fēng)力空間相關(guān)性數(shù)學(xué)模型——綜合分析法,由筆耕文化傳播整理發(fā)布。
超高層建筑層風(fēng)力空間相關(guān)性數(shù)學(xué)模型——綜合分析法
Mathematical model of spatial correlation of wind pressure coefficients for super-tall buildings: comprehensive analysis method
[1] [2]
Huang Dongmei Zhu Ledong (State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University, Shanghai 20(KO2,China)
同濟(jì)大學(xué)土木工程防災(zāi)國(guó)家重點(diǎn)試驗(yàn)室,上海200092
文章摘要:以某一高492m、具有特殊體型的超高層建筑為工程背景,探討一種建立超高層建筑層風(fēng)力空間相關(guān)性數(shù)學(xué)模型的新方法。首先,在同濟(jì)大學(xué)TJ-2邊界層風(fēng)洞中對(duì)該超高層建筑進(jìn)行剛性模型分組同步測(cè)壓風(fēng)洞試驗(yàn),,得到各測(cè)點(diǎn)層的風(fēng)力系數(shù)時(shí)程,并對(duì)各層風(fēng)力系數(shù)的頻譜特性進(jìn)行分析,獲得各類層風(fēng)力系數(shù)功率譜沿高度變化的特點(diǎn);接著,對(duì)順風(fēng)向、橫風(fēng)向和扭轉(zhuǎn)風(fēng)向的層風(fēng)力系數(shù)的空間相關(guān)性進(jìn)行詳細(xì)的分析,根據(jù)它們的特點(diǎn)提出一種建立超高層建筑層風(fēng)力空間相關(guān)性數(shù)學(xué)模型的新方法并給出擬合公式;最后,根據(jù)試驗(yàn)得到的層風(fēng)荷載功率譜和擬合的空間相干函數(shù)公式便可構(gòu)造風(fēng)荷載互功率譜矩陣。由互功率譜矩陣和前三階模態(tài)便可得到前三階廣義力功率譜,通過與剛性模型同步測(cè)壓風(fēng)洞試驗(yàn)直接獲得的結(jié)果比較表明:建立空間相關(guān)性數(shù)學(xué)模型的新方法是有效的,給出的擬合公式是可行的。
Abstr:A method of establishing a mathematical model of spatial correlation of wind pressure coefficients for super-tall buildings is explored using as example a 492m super high-rise irregularly shaped building. A rigid model synchronization pressure test of the building is carried out in a TJ-2 atmospheric boundary layer wind tunnel. The time-history of wind pressure coefficients are obtained and their frequency characteristics analyzed. The features of the power spectra of wind pressure coefficients varying in the vertical direction of the model are obtained. The spatial correlation of wind pressure coefficients for across-wind, long-wind and torsion-wind are analyzed. According to their characteristics, a method of establishing the mathematical model of spatial correlation of wind pressure coefficients for super-tall buildings is put forward and the fitting formula provided. The cross-power spectrum matrix is constructed according to wind load power spectrum from the experiment and the fitting formula of spatial correlation coefficients. According to the cross-power spectrum matrix and the first modal, the first-order generalized force power spectrum is derived. Comparison with the result of the rigid model synchronization pressure test verifies the method and the fitting formula.
文章關(guān)鍵詞:
Keyword::super-tall building spatial correlation mathematical model rigid model synchronization pressure test cross-power spectrum matrix
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課題項(xiàng)目:上海市教育委員會(huì)曙光計(jì)劃(04SG23)、上海市科學(xué)技術(shù)委員會(huì)交叉領(lǐng)域創(chuàng)新團(tuán)隊(duì)培養(yǎng)計(jì)劃(03DZ12039)
本文關(guān)鍵詞:超高層建筑層風(fēng)力空間相關(guān)性數(shù)學(xué)模型——綜合分析法,由筆耕文化傳播整理發(fā)布。
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