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盧 旦，李承銘
（上?，F(xiàn)代建筑設(shè)計（集團）有限公司，上海200041)[摘要] 上海2010年世博會日本館外形復(fù)雜、建筑高度低，考慮到近地面湍流規(guī)律的復(fù)雜性，對該建筑分別進行了穩(wěn)態(tài)與非穩(wěn)態(tài)數(shù)值風(fēng)洞仿真計算。通過比較兩種方法計算得到的平均風(fēng)壓，討論了數(shù)值計算的準確性。在此基礎(chǔ)上，研究了該復(fù)雜體型建筑的平均風(fēng)壓與脈動風(fēng)壓的分布特性，獲得了可用于指導(dǎo)類似結(jié)構(gòu)整體抗風(fēng)設(shè)計和局部抗風(fēng)設(shè)計的規(guī)律。鑒于《荷載規(guī)范》在低矮房屋圍護結(jié)構(gòu)設(shè)計中的空白，本文提出采用數(shù)值風(fēng)洞非穩(wěn)態(tài)計算的方法獲取陣風(fēng)系數(shù)，與采用規(guī)范數(shù)值相比該方法獲得的表面風(fēng)荷載更符合實際，能使設(shè)計更加安全、經(jīng)濟。
[關(guān)鍵詞] 數(shù)值風(fēng)洞；非穩(wěn)態(tài)計算；抗風(fēng)設(shè)計；脈動風(fēng)Numerical Simulation of Wind-induced Loads on Roof of Japan Pavilion of the World Exposition in Shanghai
Lu Dan, Li Chenming,
( Shanghai Xian Dai Architectural Design( Group) Co., Ltd. , Shanghal, 200041 , China)Abstract: It was difficult to obtain the wind-induced loads on roof of Japan pavilion of the 2010 world exposition in Shanghai because of its novel building shape and complex boundary layer wind. Steady and unsteady state numerical simulations were camed out to investigate the wind flow around buildings. Comparison was made with the mean presses using the above two methods; and the applicability of numerical simulation theory was discussed. The mean and fluctuating wind pressure distribution on the roof was studied and the rules which can guide global and partial wind resistance design of similar structure were obtained. In order to fill the load codes gaps in design for a low-rise building envelope, The paper presents a scheme of obtaining the fluctuating wind pressure coefficient by using unsteady state simulation. In contrast to the conventional approach, this method will be more realistic in practice.
Keywords: numerical wind tunnel; unsteady state simulation; wind-resistant design; fluctuating wind
