|Table of Contents|

Calculation of axial compression bearing capacity of concrete square columns confined by multi-spiral composite stirrups(PDF)

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

Issue:
2025年02期
Page:
58-66
Research Field:
建筑结构
Publishing date:

Info

Title:
Calculation of axial compression bearing capacity of concrete square columns confined by multi-spiral composite stirrups
Author(s):
YANG Kun1;  HU Yangyang2;  SUN Shanshan1;  GAO Xiaomin3;  JI Kangle1
(1. School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China; 2. XAUAT Engineering Technology Co., Ltd., Xi'an 710055, Shaanxi, China; 3. China Construction Sixth Engineering Bureau Civil Engineering Co., Ltd., Tianjin 300457, China)
Keywords:
multi-spiral composite stirrup;  twin shear unified strength theory;  axial compression bearing capacity;  experimental investigation;  theoretical calculation method
PACS:
TU375.3
DOI:
10.19815/j.jace.2023.03027
Abstract:
In order to study the axial compression bearing capacity of concrete square columns confined by multi-spiral composite stirrups, an axial compression experimental study including 7 short columns of this type was carried out. The effects of stirrup spacing, stirrup form and stirrup strength on the axial compression bearing capacity of the columns were discussed. Considering the multiple confinement effect of rectangular outer hoop, circular spiral inner hoop and the concrete cylinder surrounded by outer spiral stirrups on core concrete, the confinement mechanism of multi-spiral composite stirrup was analyzed. Based on the twin shear unified strength theory, the calculation formula of axial compression bearing capacity of concrete square columns confined by multi-spiral composite stirrups was derived and compared with the test results, existing national regulation and the calculation formulas proposed by scholars. The results show that the strength and ductility of multi-spiral stirrup confined concrete specimens increase with the decrease of stirrup spacing or the increase of stirrup strength. The constraint effect of multi-spiral composite stirrups is better than that of traditional cross-shaped composite stirrups, and the constraint effect of five-spiral composite stirrups is better than that of four-spiral composite stirrups. The proposed formula for calculating axial compressive capacity is of high accuracy, which verifies the applicability of the unified strength theory in the calculation of axial compression bearing capacity of concrete square columns confined by multi-spiral composite stirrups. Compared with the rectangular outer hoop, the spacing and strength of the circular spiral inner hoop have a more obvious effect on the increase of axial compression bearing capacity of the confined concrete square column.

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Last Update: 2025-03-20