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

卷:

42卷

期数:

2025年01期

页码:

62-70

栏目:

建筑结构

出版日期:

2025-01-20

文章信息/Info

Title:

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

文章编号:

1673-2049(2025)01-0062-09

作者:

杨 坤,王亚昆,刘 睿,孙珊珊,王 博

(长安大学 建筑工程学院,陕西 西安 710061)

Author(s):

YANG Kun, WANG Yakun, LIU Rui, SUN Shanshan, WANG Bo

(School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China)

关键词:

双向螺旋箍筋;  约束混凝土圆柱;  强度;  延性;  承载力

Keywords:

cross spiral stirrup;  confined circular concrete column;  strength;  ductility;  bearing capacity

分类号:

TU375.3

DOI:

10.19815/j.jace.2022.06086

文献标志码:

A

摘要:

为探讨双向螺旋箍筋约束混凝土圆柱的轴压性能,对6根不同配置的螺旋箍筋约束混凝土圆柱进行了单向轴心受压试验,分析其应力-应变曲线和破坏形态,探讨箍筋间距、箍筋形式和配箍特征值等因素对约束混凝土柱强度及延性性能的影响,提出适用于双向螺旋箍筋约束混凝土圆柱轴压承载力的计算公式。结果表明:单向螺旋箍筋与双向螺旋箍筋均能在一定程度上提高混凝土圆柱的承载力及延性; 箍筋间距相同时(双向箍筋试件的配箍量是单向箍筋试件的2倍),双向交叉螺旋箍筋约束混凝土试件的承载力和延性性能均高于单向螺旋箍筋约束混凝土试件; 对于双向交叉螺旋箍筋约束混凝土试件,当其配箍率大于2.68%时,试件承载力达到第一峰值并出现小幅下降后仍能继续增加,甚至出现第二峰值; 配箍率相同时(双向箍筋试件的箍筋间距是单向箍筋试件的2倍),双向交叉螺旋箍筋约束混凝土试件与单向螺旋箍筋约束混凝土试件的延性相差不大,但前者承载力略高; 在不降低柱的延性和强度的前提下,采用双向交叉螺旋箍筋可以增加箍筋间距,避免由于箍筋间距过小而引起混凝土浇筑振捣困难的问题,从而提高承担较大荷载(如桥梁柱)柱的可施工性。

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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相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2023-06-21
基金项目:国家自然科学基金项目(51978076); 陕西省自然科学基础研究计划项目(2021JM-177)
作者简介:杨 坤(1982-),女,工学博士,副教授,E-mail:yangkun822@126.com。Author resumes: YANG Kun(1982-), female, PhD, associate professor, E-mail: yangkun822@126.com; SUN Shanshan(1986-), female, PhD, senior engineer, E-mail: sunjin1986123@163.com.
通信作者:孙珊珊(1986-),女,工学博士,高级工程师,E-mail:sunjin1986123@163.com。

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更新日期/Last Update: 2025-01-20