Experimental investigation of full-scale concrete columns confined by high-strength transverse reinforcement subjected t
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(2020) 20:115
ORIGINAL ARTICLE
Experimental investigation of full‑scale concrete columns confined by high‑strength transverse reinforcement subjected to lateral cyclic loading Chongchi Hou1,2,3 · Wenzhong Zheng1,2,3 · Sheng Li1,2,3 · Xiaohao Wu1,2,3 Received: 11 April 2020 / Revised: 7 September 2020 / Accepted: 18 September 2020 © Wroclaw University of Science and Technology 2020
Abstract The use of high-strength longitudinal and transverse reinforcements in confined concrete columns can improve bearing capacity and deformability. Besides, experiments on confined concrete columns with side length of 400 mm can better reflect the behaviour of confined concrete columns in engineering project. Thus, the purpose of this study is to investigate the seismic behaviour of full-scale confined concrete columns with high-strength longitudinal and transverse reinforcements. Based on 15 confined concrete columns subjected to lateral cyclic loading, the effects of axial compression ratio, shear span ratio and volumetric ratio on the seismic behaviour of confined concrete columns were studied. The results showed that the ultimate drift ratios of the 15 confined concrete columns ranged from 1/43 to 1/20, i.e. 1.2–2.5 times as much as the specified limit (1/50) of rate earthquake, indicating excellent ductility. Additionally, the high-strength transverse reinforcements could not yield at peak load but could yield at the ultimate displacement. The high-strength transverse reinforcement stresses at the peak lateral load were 430–690 MPa, approximately 56–91% of the transverse reinforcement yield strength. Finally, an empirical formula was proposed to predict the ductility factor that was then evaluated by comparing the predicted values with the experimental results of 37 confined concrete columns. Keywords Confined concrete columns · Lateral cyclic loading · High-strength transverse reinforcement · Hysteretic curves · Skeleton curves · Ductility factor
1 Introduction Confined concrete has been used in the construction industry, particularly in large-span and high-rise buildings because confined concrete structures offer advantages of reducing column sizes and providing more available space for buildings and bridges [1]. Confined concrete columns with high-strength transverse and longitudinal reinforcements * Wenzhong Zheng [email protected] 1
School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China
2
Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin 150090, China
3
Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin 150090, China
perform good bearing capacity and deformability [2]. The reinforcement with characteristic tensile strength higher than 500 MPa is defined as high-strength steel bar [3]. Currently, several design codes, including ACI 318–19 [4], NZS 3101 [5] and GB50010-2010 [6], recommend usin
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