复杂高耸结构风振响应研究
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摘要
本文提出了基于高频动态测力天平试验的风振响应的频域分析方法,采用该方法可以用来求解复杂高耸结构的三维耦联风振响应,并给出了利用高频动态测力天平试验来确定广义模态力谱的计算方法。该方法利用高频动态测力天平试验得到的基底剪力自谱、基底弯矩自谱以及基底剪力与弯矩的互谱与脉动风荷载的自谱密度的相互关系并通过引入振型修正系数来求得广义模态力谱,求解结构的三维耦联风振响应。然后,采用本文方法对在建的河南省广播电视发射塔的风振响应进行了研究,结果表明横风向的位移和加速度响应的均方根值要大于顺风向,因此在计算中必须考虑横风向风振的影响。最后本文对计算振型数目和模态耦联项对结构风振响应的影响进行了分析。本文的方法对于求解复杂高耸结构的风振响应具有重要的借鉴意义。
The frequency analysis method based on high frequency force balance method(HFFB)measure- ment to calculate wind-induced vibration response was introduced.This method can be utilized to calculate the wind-induced three dimensional coupled response.Based on high frequency force balance method (HFFB)measurement the method was presented,by which power spectral density(PSD)of mode general- ized force was obtained.By means of the relations of power spectral density(PSD)of wind load and power spectral density(PSD)of base shear,Power spectral density(PSD)of base moment,cross spectral density (CSD)of base shear and base moment from high frequency force balance method(HFFB)measurement,the mode shape correction factor was introduced as well.On the basis of it,the three dimensional coupled wind induced vibration response was calculated.And the wind induced vibration response of Henan broad- cast and TV tower was studied.From the calculating results,the root mean square displacement and ac- celeration in across wind direction are larger than the results in along-wind direction.So the wind induced vibration response in across wind direction must be considered in the process of calculate.Finally,the in- fluences of mode number and mode correlation on wind induced response were studied.The methods are valuable to calculate wind induced vibration response of complex high rising structures.
The frequency analysis method based on high frequency force balance method(HFFB)measure- ment to calculate wind-induced vibration response was introduced.This method can be utilized to calculate the wind-induced three dimensional coupled response.Based on high frequency force balance method (HFFB)measurement the method was presented,by which power spectral density(PSD)of mode general- ized force was obtained.By means of the relations of power spectral density(PSD)of wind load and power spectral density(PSD)of base shear,Power spectral density(PSD)of base moment,cross spectral density (CSD)of base shear and base moment from high frequency force balance method(HFFB)measurement,the mode shape correction factor was introduced as well.On the basis of it,the three dimensional coupled wind induced vibration response was calculated.And the wind induced vibration response of Henan broad- cast and TV tower was studied.From the calculating results,the root mean square displacement and ac- celeration in across wind direction are larger than the results in along-wind direction.So the wind induced vibration response in across wind direction must be considered in the process of calculate.Finally,the in- fluences of mode number and mode correlation on wind induced response were studied.The methods are valuable to calculate wind induced vibration response of complex high rising structures.
引文
[1]张亮亮，吴云芳等．高层建筑风荷载高频测力天平试验技术[J]．重庆大学学报，2006，29(2)：99-102．
[2]李会知，吴义章，郑冰．高层建筑动态和静态风荷载的确定[J]．世界地震工程，2004，20(2)：101-105．
[3]马人乐，梁峰．河南省广播电视发射塔结构设计与试验研究[J]．特种结构，2006，23(3)：1-4．
[4]Chen X,Kareem A.Coupled dynamic analysis and equivalent static wind loads on buildings with three-dimensional modes[J].Journal of Structural Engineering,2005,131:1071-1082.
[5]Chen X,Kareem A.Dynamic wind effects on buildings with 3D coupled modes:Application of high frequency force balance measure- ments[J].Journal of Engineering Mechanics,2005,1115-1125.
[6]Yip,D Y N,Flay P G J.A new force balance data analysis method for wind response predictions of tall buildings[J].Journal of Wind En- gineering and Industrial Aerodynamics,1995,54/55 457-471.
[2]李会知，吴义章，郑冰．高层建筑动态和静态风荷载的确定[J]．世界地震工程，2004，20(2)：101-105．
[3]马人乐，梁峰．河南省广播电视发射塔结构设计与试验研究[J]．特种结构，2006，23(3)：1-4．
[4]Chen X,Kareem A.Coupled dynamic analysis and equivalent static wind loads on buildings with three-dimensional modes[J].Journal of Structural Engineering,2005,131:1071-1082.
[5]Chen X,Kareem A.Dynamic wind effects on buildings with 3D coupled modes:Application of high frequency force balance measure- ments[J].Journal of Engineering Mechanics,2005,1115-1125.
[6]Yip,D Y N,Flay P G J.A new force balance data analysis method for wind response predictions of tall buildings[J].Journal of Wind En- gineering and Industrial Aerodynamics,1995,54/55 457-471.
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