1553. Earthquake response of large‑span reinforced concrete structures with haunch braces under vertical ground motions

Jing Zhou1, Wei Mao2, Cai Jian3

1, 2, 3School of Civil Engineering and Transportation, South China University of Technology,
Guangzhou 510641, China

1, 3State Key Lab of Subtropical Building Science, South China University of Technology,
Guangzhou 510641, China

1Corresponding author

E-mail: 1ctjzhou@scut.edu.cn, 2maoweicivil@163.com, 3cvjcai@scut.edu.cn

(Received 20 October 2014; received in revised form 5 December 2014; accepted 13 January 2015)

Abstract. A new type of reinforced concrete (RC) frame system with diagonal haunch braces is introduced in a large-span sports education building. In this paper, the nonlinear dynamic responses of the large-span RC frame structures with diagonal haunch braces (RCFB) are studied under vertical near-fault pulse-like and non-pulse-like ground motions. Ten ground motions of the Chichi earthquake event are selected and divided into two groups. The large‑span plane RCFB structure is simplified from a practical engineering structure and used to perform a dynamic time‑history analysis. The vertical mid-beam displacement and the axial pressure at the base of the bottom column of the structure are compared under vertical pulse‑like and vertical non‑pulse‑like ground motions, and the effects of the structural system parameters on the vertical mid‑beam displacement are analyzed. This study shows that the vertical earthquake response of a large‑span RCFB structure is significant, especially under pulse-like ground motions, and that the structural system parameters and the impulsive effect of ground motion exhibit a distinct coupled effect on the vertical response. Optimizing the location of haunch braces is very critical in RCFB structural design.

Keywords: frame structure, diagonal haunch braces, large-span, vertical ground action, near‑fault pulse‑like.

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Cite this article

Zhou Jing, Mao Wei, Jian Cai Earthquake response of large‑span reinforced concrete structures with haunch braces under vertical ground motions. Journal of Vibroengineering, Vol. 17, Issue 2, 2015, p. 776‑791.

 

© JVE International Ltd. Journal of Vibroengineering. Mar 2015, Volume 17, Issue 2. ISSN 1392-8716