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Wind and Structures Volume 21, Number 2, August 2015 , pages 119-158 DOI: https://doi.org/10.12989/was.2015.21.2.119 |
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Vertical coherence functions of wind forces and influences on wind-induced responses of a high-rise building with section varying along height |
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D.M. Huang, L.D. Zhu, W. Chen and Q.S. Ding
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| Abstract | ||
| The characteristics of the coherence functions of X axial, Y axial, and RZ axial (i.e., body axis) wind forces on the Shanghai World Trade Centre - a 492 m super-tall building with section varying along height are studied via a synchronous multi-pressure measurement of the rigid model in wind tunnel simulating of the turbulent, and the corresponding mathematical expressions are proposed there from. The investigations show that the mathematical expressions of coherence functions in across-wind and torsional-wind directions can be constructed by superimposition of a modified exponential decay function and a peak function caused by turbulent flow and vortex shedding respectively, while that in along-wind direction need only be constructed by the former, similar to that of wind speed. Moreover, an inductive analysis method is proposed to summarize the fitted parameters of the wind force coherence functions of every two measurement levels of altitudes. The comparisons of the first three order generalized force spectra show that the proposed mathematical expressions accord with the experimental results well. Later, the influences of coherence functions on wind-induced dynamic responses are analyzed in detail based on the proposed mathematical expressions and the frequency-domain method of random vibration theory. | ||
| Key Words | ||
| high-rise building; wind tunnel test for pressure measurement; coherence function; mathematical expressions; parameter fitting; peak function; inductive analysis method | ||
| Address | ||
| D.M. Huang: School of Civil Engineering, Central South University, Changsha 410075, China; National Engineering Laboratory for High Speed Railway Construction, Central South University, Changsha 410075, China L.D. Zhu, W. Chen and Q.S. Ding:State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China | ||