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为研究核心型钢在节点区的截断形式对核心型钢混凝土(CSRC)节点变形性能的影响,进行了4个CSRC节点试件的低周反复加载试验。主要研究参数为核心型钢在节点区的截断锚固形式和轴压比,通过试验数据分析了各参数对CSRC节点的强度、刚度、延性和滞回特性等的影响。在对试件总体变形及塑性铰区域和节点核芯区变形量测结果统计分析基础上,研究了梁端的弯曲变形、节点区的剪切变形和柱身的弯曲变形所产生的侧移在框架结构总侧移中所占的比例及其规律。研究表明:该文提出的两种核心型钢的截断锚固构造对试件的抗震性能无明显不利影响。核心型钢在节点核芯区的截断会导致节点区剪切变形增加。两种不同核心型钢构造形式的试件节点区剪切变形基本相同。该文可为CSRC结构的拟静力弹塑性反应分析提供参考。
In order to study the influence of the truncated form of the core section on the deformation behavior of the core reinforced concrete (CSRC) joints, four CSRC joints were subjected to the low cycle repeated loading test. The main research parameters are the truncated anchorage form and axial compression ratio of the core steel in the nodal region. The influence of each parameter on the strength, stiffness, ductility and hysteretic characteristics of the CSRC node is analyzed through the experimental data. Based on the statistical analysis of the total deformation of the specimen and the deformation of the plastic hinge area and the core area of the node, the lateral displacement caused by the bending deformation of the beam end, the shear deformation of the node area and the bending deformation of the column body is studied. Structure of the total lateral displacement in the proportion and its law. The results show that the truncated anchoring structures of the two core sections proposed in this paper have no obvious adverse effect on the seismic performance of the specimens. The truncation of the core steel in the core region of the node will result in the increase of the shear deformation in the nodal region. The shear deformation of the specimen nodal zone of two different types of core steel is basically the same. This paper can provide a reference for quasi-static elastic-plastic response analysis of CSRC structures.