型钢混凝土L形柱-混凝土梁框架节点滞回性能试验研究

发布时间：2018-04-12 00:31

本文选题：型钢混凝土 + L形柱　；参考：《土木工程学报》2016年09期

【摘要】：为研究型钢混凝土L形柱-混凝土梁框架节点的滞回性能,以柱截面配钢形式、轴压比、水平加载角度及有无楼板参与工作为变化参数,进行4个平面和7个空间L形柱-混凝土梁框架节点的拟静力试验;比较分析试件的破坏形态、滞回曲线、承载能力、刚度退化、耗能能力、位移延性以及层间位移角等抗震性能指标。研究结果表明:平面节点和空间节点的破坏形态分别为核心区发生剪切破坏和梁端出现塑性铰,带楼板工作的钢筋混凝土梁柱空间节点出现板的弯曲破坏以及梁底出现塑性铰的破坏模式;配实腹式型钢试件的滞回曲线比配空腹式型钢试件的饱满;平面节点的承载能力比空间节点的大,但耗能能力、位移延性及抗倒塌能力均不及空间节点;楼板的存在对节点承载能力的提高和维持刚度的稳定均具有有利作用;轴压比可提高节点的承载力和初始刚度;L形柱框架节点的层间变形能力大于规范规定的层间位移角限值。通过引入加载角度,提出了型钢混凝土L形柱-梁空间节点受剪承载力计算模型,其能较好地反映节点核心发生剪切破坏的传力机制。
[Abstract]:In order to study the hysteretic behavior of steel reinforced concrete L-shaped column-concrete beam frame joints, the parameters of column section, axial compression ratio, horizontal loading angle and the participation of floor slab are taken as parameters.The pseudostatic test of 4 plane and 7 space L-shaped column-concrete beam frame joints was carried out, and the failure patterns, hysteretic curves, bearing capacity, stiffness degradation, energy dissipation capacity of the specimens were compared and analyzed.Seismic performance indexes such as displacement ductility and interstory displacement angle.The results show that the failure patterns of plane joints and spatial joints are shear failure in the core region and plastic hinge at the beam end, respectively.The bending failure of reinforced concrete Liang Zhu space joint and the failure mode of plastic hinge on the bottom of beam, the hysteretic curve of the steel specimen with solid web is fuller than that of the steel specimen with empty stomach, and the bending failure mode of the space joint of reinforced concrete with working floor slab and the failure mode of plastic hinge on the bottom of the beam are also discussed.The bearing capacity of plane joints is larger than that of spatial joints, but the energy dissipation capacity, displacement ductility and collapse resistance are not as good as those of space joints, and the existence of floor slab is beneficial to the improvement of the bearing capacity and the stability of stiffness of the joints.The axial compression ratio can improve the bearing capacity and initial stiffness of the joints and the interstory deformation capacity of the L-shaped column frame joints is greater than the inter-story displacement angle limit specified in the code.By introducing the loading angle, a model for calculating the shear capacity of spatial joints of L-shaped columns and beams of steel reinforced concrete (SRC) is proposed, which can better reflect the mechanism of shear failure in the core of the joints.
【作者单位】：广西大学土木建筑工程学院;工程防灾与结构安全教育部重点实验室;
【基金】：国家自然科学基金(50908057,51268004) 广西防灾减灾与工程安全重点实验室开放课题(2012ZDX10) 广西研究生教育创新计划项目(YCBZ2012005)
【分类号】：TU398.9

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