HRB635高强箍筋约束高强钢筋混凝土短柱轴压性能试验研究
Experimental investigation on axial compressive performance of high-strength concrete short columns reinforced by HRB635 longitudinal rebar and stirrups
王静峰 1高建发 2刘用 1沈奇罕 1崔玉博 2魏滔锴3
作者信息
- 1. 合肥工业大学土木与水利工程学院,安徽合肥 230009;合肥工业大学土木工程结构与材料安徽省重点实验室,安徽合肥 230009
- 2. 合肥工业大学土木与水利工程学院,安徽合肥 230009
- 3. 安徽吾兴新材料有限公司,安徽合肥 230022
- 折叠
摘要
为研究高强箍筋约束高强钢筋混凝土短柱的轴压性能及三种材料间的匹配性,进行了 11根HRB635高强箍筋约束高强钢筋混凝土短柱的轴压试验,研究了混凝土强度、纵筋强度、体积配箍率等参数对短柱轴压性能的影响规律.结果表明:HRB635高强箍筋约束高强钢筋混凝土短柱的轴压承载力和初始刚度主要随高强箍筋体积配箍率以及混凝土强度的增大而提升;高强箍筋在峰值荷载时均未屈服,箍筋强度对轴压承载力影响较小,轴压承载力计算时可不考虑箍筋强度,但其对短柱延性有明显提升;HRB635高强纵筋与C60以下混凝土共同工作时,纵筋在峰值荷载时未进入屈服,材料难以充分利用,因此HRB635高强纵筋应适配C60以上强度等级的混凝土.此外,采用GB 50010-2010《混凝土结构设计规范》与ACI 318-14中钢筋混凝土柱轴压承载力计算式对高强箍筋约束高强钢筋混凝土柱轴压承载力的预测过于保守.收集已有相关试验数据,考虑箍筋和高强纵筋不屈服,修正了钢筋混凝土柱轴压承载力的计算式,计算结果与试验结果较为吻合.
Abstract
In order to study the mechanical properties of high-strength reinforced concrete short columns constrained by high-strength stirrups under axial compression and the compatibility between the three materials,the axial compression tests of 11 high-strength reinforced concrete short columns constrained by high-strength stirrups of HRB635 were carried out,and the influences of the strength of concrete,longitudinal reinforcement strength,and the volume stirrup ratio on the axial compression performance of columns were investigated.The results show that the axial compression capacity and stiffness of columns mainly increase with the increase of the volume ratio of high-strength stirrups and the concrete strength.The high-strength stirrups do not yield at the peak load,so the stirrup strength has little impact on the axial compression capacity,and the stirrup strength does not need to be considered when calculating the axial compression capacity,but it significantly improves the ductility of the specimen.When HRB635 high-strength longitudinal bars work together with concrete below C60,the longitudinal bars do not yield at the peak load,making it difficult to fully utilize its strength.Therefore,HRB635 high-strength longitudinal bars should be used together with concrete above C60.In addition,the calculated axial compressive capacity of reinforced concrete columns constrained by high-strength stirrups using the formula in GB 50010-2010 and ACI 318-14 for reinforced concrete columns is too conservative.Collecting the existing relevant test data,the calculation formula for the axial compressive load capacity of reinforced concrete columns was modified,considering the hoop reinforcement and high-strength longitudinal reinforcement not yielding,and the calculation results are in good agreement with the experimental results.
关键词
轴压短柱/高强钢筋/高强混凝土/轴压性能/约束效应/承载力计算Key words
short column of axial pressure/high-strength hot rolled steel bar/high-strength concrete/axial compression performance/confinement effect/bearing capacity calculation引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据