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Received: 2009-07-07

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Journal of Zhejiang University SCIENCE A 2009 Vol.10 No.11 P.1561-1572

http://doi.org/10.1631/jzus.A0930002


Property of critical excitation for moment-resisting frames subjected to horizontal and vertical simultaneous ground motions


Author(s):  Kohei FUJITA, Izuru TAKEWAKI

Affiliation(s):  Department of Urban and Environmental Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku 615-8540, Japan

Corresponding email(s):   takewaki@archi.kyoto-u.ac.jp

Key Words:  Critical excitation, Multi-component ground input, Critical cross spectrum, Coherency, Simultaneous input


Kohei FUJITA, Izuru TAKEWAKI. Property of critical excitation for moment-resisting frames subjected to horizontal and vertical simultaneous ground motions[J]. Journal of Zhejiang University Science A, 2009, 10(11): 1561-1572.

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Abstract: 
It has often been reported that, when building structures are subjected to near-fault earthquake ground motions, horizontal and vertical impulsive inputs may cause critical damage during the first few seconds. In practical design of building structures, however, the safety check, taking into account the effect of multi-component ground motions, is hardly conducted except the design of important structures such as high-rise buildings and nuclear power plants. Furthermore, it is not clear how the correlation of multi-component ground motions influences the actual safety of structures. In this paper, the detailed property of critical excitation is discussed in association with the relationship between the characteristics of ground motions and those of structures. The properties of various auto power spectral density (PSD) functions of the horizontal and vertical ground motions are investigated, and those of the critical cross PSD function of these two-directional ground motions are found by a devised algorithm in a feasible complex plane. A closed-form expression is derived from the critical relation of the auto PSD functions of the simultaneous inputs. This critical excitation method provides us with a new approach for earthquake-resistant design against the possible future earthquake which causes the critical damages to buildings.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

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Open peer comments: Debate/Discuss/Question/Opinion

<1>

Isabelle<isabellepoly@163.com>

2010-01-29 10:40:41

This critical excitation method provides a new approach for earthquake-resistant design against the possible future earthquake which causes the critical damages to buildings. Intersting paper!

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