反复荷载下型钢混凝土异形柱空间角节点的破坏机理及损伤分析

王妮; 陈宗平; 陈宇良

doi:10.6052/j.issn.1000-4750.2013.10.0908

反复荷载下型钢混凝土异形柱空间角节点的破坏机理及损伤分析

1.
广西大学土木建筑工程学院,南宁 530004;
2.
广西大学工程防灾与结构安全教育部重点实验室,南宁 530004

基金项目: 国家自然科学基金项目(50908057,51268004); 广西自然科学基金项目(2013GXNSFDA019025); 广西研究生创新计划项目(YCBZ2012011)

详细信息

作者简介:
王妮(1985―),女,陕西西安人,博士生,主要从事钢与混凝土组合结构研究(E-mail: wangnivviv@163.com);陈宇良(1987―),男,广西贵港人,博士生,主要从事钢与混凝土组合结构研究(E-mail: 234356108@qq.com).

通讯作者:
陈宗平(1975―),男,广西玉林人,教授,博士,主要从事钢与混凝土组合结构、再生混凝土结构等研究(E-mail: zpchen@gxu.edu.cn).

中图分类号: TU398
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出版历程
- 收稿日期: 2013-10-03
- 刊出日期: 2015-03-24

FAILURE MECHANISM AND DAMAGE ANALYSIS OF SPACE CORNER JOINTS OF SRC L-SHAPED COLUMNS UNDER CYCLIC LOADING

1.
College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;
2.
Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, China

摘要

摘要: 为了研究反复荷载作用下型钢混凝土(SRC)异形柱空间角节点的破坏机理及其损伤演变过程,设计9个试件进行低周反复荷载试验,考虑了柱截面配钢形式、轴压比、加载角度和梁的形式4个变化参数。观察其裂缝发展形态,揭示其破坏机理,获取了荷载-应变滞回曲线、节点核心区剪切变形和梁截面平均曲率。基于能量守恒定律,分析了反复荷载下试件的损伤规律,并分析了各变化参数对其累积损伤的影响。研究结果表明：反复荷载作用下SRC异形柱空间角节点发生的是弯曲、剪切斜压破坏为主、扭转伴随粘结破坏为辅的破坏形态。破坏时节点核心区钢材大部分已屈服,并且型钢应变、核心区剪切角、梁截面平均曲率均随柱肢角度的增加而减小。破坏时试件的累积损伤指标介于0.69~0.84,槽钢桁架试件各级位移下的累积损伤最大;45°加载实腹配钢试件较30°加载实腹配钢试件损伤更加严重;与45°加载试件相比,0°加载试件各级位移下累积损伤程度最高增加30%;轴压比对试件的损伤影响不大;与带钢梁试件相比,带型钢混凝土梁试件累积损伤有较大程度的缓解。
- 型钢混凝土 /
- 空间角节点 /
- 反复荷载 /
- 破坏机理 /
- 损伤分析
Abstract: To study the failure mechanism and damage evolution process of space corner joints of steel reinforced concrete (SRC) special-shaped columns, 9 specimens were designed to perform low cyclic loading tests. Four parameters were considered, which were the column section steel form, the axial compression ratio, the load angle and the beam form. The crack development pattern was observed, and the failure mechanism was revealed. The load-strain hysteretic curve, the shear deformation at joint core areas and the mean curvature of beam cross-sections were obtained. Based on the law of energy conservation, the damage characteristics of specimens were studied, and the influence of varying parameters on damage accumulation were analyzed. Results indicate the failure patterns of space corner joints of SRC special-shaped columns are bending and shear-diagonal compression, and are accompanied by torsion and adhesive failures. Most steel at joint core areas has yield, and with the increase of the column limb angle, the steel strain, shear angle and mean curvature of beam cross-sections decrease. The cumulative damage index amongst all specimens is between 0.69 and 0.84 at the state of failure, and that of specimens with channel steel truss is the largest at various levels of displacement. The damage of 45° loading specimens with solid web steel is more severe than that of 30°. Compared with 45° loading specimens, the cumulative damage of 0° loading specimens at various levels of displacements is increased by up to 30%. The effects of axial compression ratio on specimen damage are comparatively insignificant. Compared with specimens with steel beams, the cumulative damage of specimens with steel reinforced concrete beams has a greater degree of ease.
- steel reinforced concrete /
- space corner joint /
- cyclic loading /
- failure mechanism /
- damage analysis

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参考文献(16)

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反复荷载下型钢混凝土异形柱空间角节点的破坏机理及损伤分析

作者简介: 王 妮(1985―),女,陕西西安人,博士生,主要从事钢与混凝土组合结构研究(E-mail: wangnivviv@163.com);陈宇良(1987―),男,广西贵港人,博士生,主要从事钢与混凝土组合结构研究(E-mail: 234356108@qq.com).

通讯作者: 陈宗平(1975―),男,广西玉林人,教授,博士,主要从事钢与混凝土组合结构、再生混凝土结构等研究(E-mail: zpchen@gxu.edu.cn).

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出版历程

FAILURE MECHANISM AND DAMAGE ANALYSIS OF SPACE CORNER JOINTS OF SRC L-SHAPED COLUMNS UNDER CYCLIC LOADING

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出版历程

目录

作者简介:
王妮(1985―),女,陕西西安人,博士生,主要从事钢与混凝土组合结构研究(E-mail: wangnivviv@163.com);陈宇良(1987―),男,广西贵港人,博士生,主要从事钢与混凝土组合结构研究(E-mail: 234356108@qq.com).

通讯作者:
陈宗平(1975―),男,广西玉林人,教授,博士,主要从事钢与混凝土组合结构、再生混凝土结构等研究(E-mail: zpchen@gxu.edu.cn).