Seismic Response of RC High-Rise Buildings in Japan Considering Internal Viscous Damping

Abstract eng:
Seismic response analyses as an RC high-rise design are in general performed against two different levels of earthquake intensities. Stiffness-proportional damping is chosen for its internal viscous damping. It is customary to use a certain value as a damping ratio in the first mode. On the other hand, recorded values of damping ratios for small earthquake intensity level tend to be smaller than the chosen value for the analysis design of high-rise structures. The variations of seismic response values are evaluated while those analyses are conducted for the various sizes of internal viscous damping. The analysis results show that maximum response values depend on the values of damping constant for the first mode and the differences of damping constant for higher modes. Furthermore, choosing instantaneous stiffness-proportional damping for analysis model, the fluctuating ratios of response values derived from using several cases of damping constant (h1) to those derived from using a damping constant of h1=3% are presented to evaluate the effect of internal viscous damping for earthquake-resistant design. The results show that the response values against large scale intensity motions for h1=2% (instantaneous stiffness-proportional model) are greater among base-shear coefficient, overturning moment, and whole displacement angle by 10% than those for h1=3%. The maximum response values for various values of internal viscous damping are studied for RC high-rise buildings in Japan. Consequently, the effects of internal viscous damping on maximum response values are thoroughly evaluated.

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