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Axial compression performance experiment research and bearing capacity calculation of circular concrete columns confined by cross spiral stirrups(PDF)

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

Issue:
2025年01期
Page:
62-70
Research Field:
建筑结构
Publishing date:

Info

Title:
Axial compression performance experiment research and bearing capacity calculation of circular concrete columns confined by cross spiral stirrups
Author(s):
YANG Kun;  WANG Yakun;  LIU Rui;  SUN Shanshan;  WANG Bo
(School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China)
Keywords:
cross spiral stirrup;  confined circular concrete column;  strength;  ductility;  bearing capacity
PACS:
TU375.3
DOI:
10.19815/j.jace.2022.06086
Abstract:
In order to investigate the axial compression performance of circular concrete columns confined by cross spiral stirrups, uniaxial compression experiments on 6 confined concrete columns were carried out. The effects of stirrup spacing, stirrup form and stirrup characteristic value on the strength and ductility of the confined concrete columns were discussed, and a formula for calculating the axial compression bearing capacity of circular concrete columns confined by cross spiral stirrups was proposed. The results show that both regular spiral stirrups and cross spiral stirrups can improve the bearing capacity and ductility of circular concrete columns to a certain extent. When the stirrup spacing is the same(the stirrup ratio of cross spiral stirrups is twice that of the regular spiral stirrups), the bearing capacity and ductility of specimens with cross spiral stirrups are higher than those of specimens with regular spiral stirrups. When the stirrup ratio is greater than 2.68%,the bearing capacity of the specimen reaches the first peak and can increase after a slight decrease, and even the second peak appears. When the stirrup ratios are the same(the spacing of the cross stirrups is twice that of the regular stirrup), the ductility of specimens with cross spiral stirrups and specimens with regular spiral stirrups is similar, but the carrying capacity of the former is slightly higher. Therefore, without reducing the ductility and strength of columns, using the cross spiral stirrups can avoid the problem of difficult vibration of concrete pouring caused by too small spacing of stirrups, so as to improve the constructability of columns bearing large loads(such as bridge columns).

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Last Update: 2025-01-20