弯剪耦合破坏T形截面RC剪力墙抗震性能试验研究

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Abstract Aiming at the potential coexistence of shear-controlled failure for the flange-in-tension case and flexure-controlled failure for the flange-in-compression case of T-shaped reinforced concrete shear walls, two flexure-shear coupling controlled walls and one flexure-controlled wall were tested under quasi-static loading. The crack distribution pattern and failure mechanism of T-shaped walls were compared and analyzed, and the effects of shear span ratio and horizontal reinforcement ratio on the seismic behavior of T-shaped walls were investigated. Test results show that the flexure-shear coupling controlled T-shaped walls failed due to the localized damage of the free end of web, and the failure zone penetrated obliquely over the entire boundary restraint region. Reducing the horizontal reinforcement ratio would aggravate the development of inclined cracks and vertical staggered cracks in T-shaped walls, leading to the phenomenon of "splitting" near the centroidal axis, so as to offset the reduction of deformation capacity caused by the intensified shear effect. Decreasing the shear span ratio would significantly weaken the ductility and energy dissipation capacity of the T-shaped walls, resulting in an increased proportion of shear deformation to 50%. There are obvious differences and deficiencies in the calculation of shear capacity of T-shaped walls based on design codes at home and abroad. In order to achieve the seismic design goal of "strong shear-weak bending", the shear capacity of T-shaped walls should be at least 15% higher than the flexural capacity for safety. Although the T-shaped walls failed in flexure-shear coupling mode exhibit poor deformation capacity in the flange-in-tension loading direction, it still meets the inter-story drift ratio limit under rare intensity earthquake required by Chinese seismic design code.

Key words： reinforced concrete shear wall T-shaped section quasi-static test seismic behavior shear behavior shear capacity

Received: 19 December 2022 Published: 28 December 2023

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	Articles by authors
	WANG Bin1
	2
	ZHANG Lipeng2
	WU Mengzhen2
	CAI Wenzhe1
	3
	SHI Qingxuan1
	2
	LI Han2

Cite this article:

WANG Bin1,2,ZHANG Lipeng2, et al. Experimental study on seismic behavior of T-shaped RC shear walls failed in a flexure-shear coupling mode[J]. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(24): 308-316.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2023/V42/I24/308

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