基于JC法的近场地震作用下钢筋混凝土高墩塑性铰形成概率分析

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Abstract

In order to study probability of plastic hinge formation of a reinforced concrete (RC) high pier under near-field seismic action, a certain RC high pier with a height of 90m was taken as the study object. Firstly, the support vector machine algorithm was used to predict the equivalent yield curvature of its cross section. Then, considering pier parameters and the randomness of near-field seismic action, the software OpenSees was used to build the high pier model to do the increment dynamic nonlinear analysis. Finally, the equivalent yield curvature was taken as the critical index, and dynamic responses of the pier’s cross section were equivalently normalized with JC method to calculate and analyze the probability of plastic hinge formation of the pier’s cross section. The results showed that equivalent yield curvature of RC high pier cross section in forward bridge direction and that in transverse bridge one have obvious discreteness and obey normal distribution; under near-field seismic action in forward bridge direction, probabilities of plastic hinge formation in pier bottom area and pier middle part are larger to form plastic hinges, plastic hinge length in pier middle part is 31.7m and 84.3% longer than that determined only considering the randomness of seismic action; under the near-field seismic action in transverse bridge direction, probability of plastic hinge formation in pier bottom area is larger, and plastic hinge length is basically consistent to that determined only considering the randomness of seismic action; the probability analysis method for plastic hinge formation can be used to more accurately evaluate plastic hinge formation and distribution of RC high-piers.

Key words： reinforced concrete high-pier near-fault ground motion formation probability of plastic hinge JC method equivalent yield curvature

Received: 07 May 2018 Published: 28 June 2019

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	Articles by authors
	ZHAO Jingang1
	ZHAN Yulin2
	3
	JIA Hongyu2
	LI Xi2
	XIE Mingzhi2

Cite this article:

ZHAO Jingang1,ZHAN Yulin2,3, et al. Probability analysis for plastic hinge formation of a RC high pier under near-field seismic action based on JC method[J]. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(13): 64-72.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2019/V38/I13/64

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