|Table of Contents|

Experimental study on axial compression performance of square concrete column confined with new multi-spiral composite stirrups(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年04期
Page:
80-86
Research Field:
建筑结构
Publishing date:

Info

Title:
Experimental study on axial compression performance of square concrete column confined with new multi-spiral composite stirrups
Author(s):
YANG Kun;  GUO Shuhui;  WANG Yakun;  LIU Rui;  HU Yangyang
(School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China)
Keywords:
high-strength stirrup;  multi-spiral composite stirrup;  confined square concrete column;  strength;  ductility
PACS:
TU375.3
DOI:
10.19815/j.jace.2021.10071
Abstract:
In order to better understand the axial compressive behavior of square concrete columns confined with new multi-spiral composite stirrups, an experimental study including 8 square concrete columns was performed. The failure process and failure mode of this type of confined concrete square columns were observed, and the stress-strain relationship curves of concrete columns confined with multi-spiral composite stirrup were discussed. The influences of stirrup spacing, stirrup strength and stirrup configuration on the strength and ductility of concrete columns were compared and analyzed. The results show that the new multi-spiral composite stirrups can effectively improve the strength and ductility of reinforced square concrete columns. When the stirrups are properly configured, the peak strength of the four-spiral stirrup can be increased by two times, and the ductility ratio of the five-spiral stirrup can reach 1.98. The constraint effect of this type of columns is better than that with traditional well shaped composite stirrup columns, and the constraint effect of five-spiral composite stirrup column is stronger than that of four-spiral composite stirrup column. The strength and ductility of this type of specimen will increase with the decrease of stirrup spacing and the increase of stirrup strength, and the stress-strain curve of the specimen confined by stirrup with small spacing and high strength is more gentle, and the deformation performance is better. Moreover, the stress growth of the rectangular outer hoop is higher than that of the spiral inner hoop. When the specimens reach the peak load, the normal strength stirrups all yield, while most of the high strength stirrups do not yield, which can provide a certain safety reserve for the specimens to have good ductility before reaching the ultimate failure state.

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Last Update: 2023-07-01