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【期刊论文】Mathematical model of acrosswind dynamic loads on rectangular tall buildings
梁枢果, Shuguo Lianga, *, Shengchun Liua, Q.S. Lib, Liangliang Zhangc, Ming Gud
Journal of Wind Engineering and Industrial Aerodynamics 90(2002)1757-1770,-0001,():
-1年11月30日
By investigating acrosswind forces on rectangular cylinders withvarious side ratios atnormal attack angle in a boundary layer wind tunnel, this paper presents empirical formula ofacrosswind force spectra, RMS lift coefficients and Strouhal numbers of rectangular tallbuildings, and coherence functions of acrosswind force are also probed. Thus, a completeanalytical model of acrosswind dynamic loads on rectangular tall buildings is established. Thismodel is in good agreement withth e experimental results obtained by wind tunnel tests; so it isreliable and applicable. A calculation method based on this model can be developed toevaluate wind-induced acrosswind responses of rectangular tall buildings in frequencydomain.
Tall buildings, Acrosswind dynamic load, Wind tunnel test, Lift coefficient, Acrosswind force spectrum
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梁枢果
空气动力学学报,2002,20(2):233~245,-0001,():
-1年11月30日
本文对于u形渡槽槽体结构模型进行了风漏实验研究,得出了u形渡槽槽体结构的风压分布和风载体型系数。风洞试验结果表明u形渡槽槽体的风压分布和风载体形系数同槽体的高宽比和流场状况有关,在同一流场状况下槽体的风载体形系数随着槽体的高宽比变化。本文的试验结果为渡槽结构的抗风设计提供了参考依据。
渡槽, 风工程, 风洞实验
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【期刊论文】CALCULATION OF VERTICAL DYNAMIC CHARACTERISTICS OF TALL BUILDINGS WITH VISCOUS DAMPING
梁枢果, Q. S. LI, * J. Q FANG and A. P. JEARY
Ira. J. Solid Struclures Vol. 35, No.24. pp. 316-3176, 1998,-0001,():
-1年11月30日
The magnitude of the vertical component of earthquake ground motion is often aboutone-third of the horizontal component. Thus, it is necessary to calculate vertical dynamic charac-teristics of tall buildings and high-rise structures in design stage for certain cases. In analysing freevibrations of tall buildings and high-rise structures, it is possible to regard such structures as acantilever bar with variable cross-section. In this paper, the differential equations of free longitudinalvibrations (in vertical direction) of bars with variably distributed mass and stiffness consideringdamping effect are established. The damping coefficient of a bar is assumed to be proportional toits mass, and the general solutions of mode shapes of damped distributed parameter systemsare reduced to Bessel's equations by selecting suitable expressions, such as power functions andexponential functions, for the distributions of stiffness and mass. An approach to determine thenatural frequencies and mode shapes in vertical direction for tall buildings with variably distributedstiffness and variably distributed mass is proposed. The presented method is also applicable to thefree longitudinal vibration analysis without considering damping effect (damping coefficient invibration equations is equal to zero). A numerical example shows that the computed values of thefundamental longitudinal natural frequency and mode shape by the proposed method are close tothe full scale measured data. It is shown through the numerical example that the selected expressionsare suitable for describing the distributions of stiffness and mass of typical tall buildings. A com-parison between undamped structural dynamic characteristics and damped natural frequencies,mode shapes is made in this paper.
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梁枢果, Q. S. LI*, K. YANG, , N. ZHANG, C. K. WONG AND A. P. JEARY
Struct. Design Tall Build. 11, 129-153(2002),-0001,():
-1年11月30日
This paper describes some results obtained from full-scale measurements of wind effects on a super-tall building,Di-Wang Tower, located in Shenzhen, China. This tall building has 79-storeys with a height of approximately324 m. Field measurements including wind speed, wind direction and wind-induced acceleration responses havebeen made. The amplitude-dependent characteristics of damping are obtained by using the random decrementtechnique from the detailed analysis of the field acceleration measurements. The main objective of this paper is topresent detailed investigations into the effects of nonlinear damping on the dynamic responses of the tall buildingsubjected to various types of applied loads based on the measured amplitude-dependent damping characteristics.The predicted dynamic responses of the building obtained by using the measured damping characteristics werecompared with those computed by using constant damping parameters assumed by the structural designers. It isconcluded from the investigations that knowledge of actual damping characteristics are very important in theaccurate prediction of the dynamic responses of a tall building when the major harmonic components of theapplied loads overlap with the lowest natural frequencies of the building. The design damping level for tallbuilding structures currently used by structural engineering practitioners appears to be high and not conservative.Copyright
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【期刊论文】Torsional dynamic wind loads on rectangular tall buildings
梁枢果, Shuguo Liang a, *, Q.S. Li b, Shengchun Liu a, Liangliang Zhang c, Ming Gu d
Engineering Structures 26(2004)129-137,-0001,():
-1年11月30日
Wind-induced dynamic torque on rectangular cylinders with various side ratios is investigated through a series of model tests ina boundary layer wind tunnel. Based on the experimental investigation, this paper presents empirical formulae of torque spectra,RMS torque coefficients and Strouhal number, as well as coherence functions of torque. An analytical model of wind-induceddynamic torque on rectangular tall buildings is established accordingly. Comparisons of the results from the proposed model andthe wind tunnel measurements verify the reliability and applicability of the developed model for evaluation of torsional dynamicwind loads on rectangular tall buildings. A calculation method is presented based on the proposed model to estimate wind-inducedtorsional responses of rectangular tall buildings in the frequency domain.
Tall building, Vibration, Wind tunnel test, Wind effect, Torsional load
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