轴压比对RC短柱受剪性能的影响机理  

Influence Mechanism of Axial Compression Ratio on Shear Behavior of RC Short Columns

作　　者：郑家乐 付李 ZHENG Jiale;FU Li(School of Civil Engineering and Architecture,KEYI College of Zhejiang Sci-tech University,Shaoxing 312500,China;School of Environment and Civil Engineering,Jiangnan University,Wuxi 214122,China)

机构地区：[1]浙江理工大学科技与艺术学院建筑工程学院,浙江绍兴312500 [2]江南大学环境与土木工程学院,江苏无锡214122

出　　处：《土木工程与管理学报》2023年第3期118-123,共6页Journal of Civil Engineering and Management

基　　金：国家自然科学基金(51908248);城市基础设施智能化浙江省工程研究中心项目(IUI2022-YB-09);浙江理工大学科技与艺术学院院设科研项目(KY2022020)。

摘　　要：为了研究轴压比对钢筋混凝土短柱受剪性能的影响机理,应用三维刚体弹簧元法模拟了不同轴压比短柱在单调及循环荷载作用下的破坏过程,并结合梁-拱抗剪机制模型和开裂变形模式对受剪性能进行了分析。研究结果表明:随着循环次数的增加,抗剪承载力逐渐退化,轴压比的增大加剧了退化趋势,这主要是高轴压比使短柱发生更加明显的脆性破坏,产生了更多裂缝,从而使梁机制中混凝土抗剪作用急剧退化。In order to study the influence mechanism of axial compression ratio on the shear behavior of reinforced concrete(RC)short columns,the failure process of short columns with different axial compression ratios under monotonic and cyclic loads was simulated by using three-dimensional rigid body spring element method(3D RBSM),and the shear behavior was analyzed by combining the shear mechanism of beam-arch model and cracking deformation.The results show that with the increase of cycle numbers,the shear bearing capacity gradually degrades,and the increase of axial compression ratio aggravates the degradation trend,which is mainly caused by the brittle failure of short columns and more cracks caused by high axial compression ratio,which leads to the rapid degradation of shear mechanism of concrete in beam model.

关 键 词：钢筋混凝土短柱 轴压比 受剪性能 三维刚体弹簧元法 机理研究 

分 类 号：TU375.3[建筑科学—结构工程]