力学季刊
力學季刊
역학계간
CHINESE QUARTERLY OF MECHANICS
2010年
1期
92-100
,共9页
超高层建筑%风荷载%风速时程%线性滤波法%自回归模型%模拟
超高層建築%風荷載%風速時程%線性濾波法%自迴歸模型%模擬
초고층건축%풍하재%풍속시정%선성려파법%자회귀모형%모의
super high-rise building%wind load%wind speed time series%linear filtering method%auto-regressive model%simulation
风荷载是超高层建筑设计的主要荷载之一,对超高层建筑进行风振时程分析能更准确和直观地了解结构风振响应的特性.为了进行风振响应时程分析,必须较为准确地模拟作用在结构上的脉动风荷载.首先,本文采用基于自回归(AR)模型的线性滤波法对上海中心大厦场地的脉动风速时程进行了数值模拟,通过检验模拟脉动风速的功率谱和相干函数平方根与目标值的吻合程度,验证了基于AR模型模拟超高层建筑脉动风速时程的可行性.然后,本文考虑了上海中心大厦外形向上扭转收缩的特点,由模拟的脉动风速时程计算生成作用在结构上的脉动风荷载.
風荷載是超高層建築設計的主要荷載之一,對超高層建築進行風振時程分析能更準確和直觀地瞭解結構風振響應的特性.為瞭進行風振響應時程分析,必鬚較為準確地模擬作用在結構上的脈動風荷載.首先,本文採用基于自迴歸(AR)模型的線性濾波法對上海中心大廈場地的脈動風速時程進行瞭數值模擬,通過檢驗模擬脈動風速的功率譜和相榦函數平方根與目標值的吻閤程度,驗證瞭基于AR模型模擬超高層建築脈動風速時程的可行性.然後,本文攷慮瞭上海中心大廈外形嚮上扭轉收縮的特點,由模擬的脈動風速時程計算生成作用在結構上的脈動風荷載.
풍하재시초고층건축설계적주요하재지일,대초고층건축진행풍진시정분석능경준학화직관지료해결구풍진향응적특성.위료진행풍진향응시정분석,필수교위준학지모의작용재결구상적맥동풍하재.수선,본문채용기우자회귀(AR)모형적선성려파법대상해중심대하장지적맥동풍속시정진행료수치모의,통과검험모의맥동풍속적공솔보화상간함수평방근여목표치적문합정도,험증료기우AR모형모의초고층건축맥동풍속시정적가행성.연후,본문고필료상해중심대하외형향상뉴전수축적특점,유모의적맥동풍속시정계산생성작용재결구상적맥동풍하재.
Wind load is one of the main loads in the design of super high-rise buildings, and the wind induced response of super high-rise building can be calculated more precisely and be visually displayed through time history analysis. Therefor, simulating fluctuating wind load time series is necessary for time history analysis of wind induced response. Linear filtering method based on auto-regressive model was used to simulate fluctuating wind speed time series on the site of Shanghai center tower, and the method proves to be effective through comparing the simulated values of wind speed power spectral density and magnitude squared coherence with the target values. Through the simulated fluctuating wind speed, the simulated fluctuating wind load acting on Shanghai center tower was obtained afterwards with consideration of the section shrinkage and torsion.
