【摘要】 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。更多还原

【Abstract】 Four core steel reinforced concrete (CSRC) joints were tested under cyclic loadings to investigate the effect of truncation and embedded details of core steel to the deformation performance of the specimens. The main parameters are axial compression ratio and the truncation and embedded details of core steel in a joint core. The effect of these parameters on the strength, stiffness, ductility and the hysteretic behaviour of CSRC joints are investigated based on test results. Based on the analysis of the test data on the global deformation of CSRC joints and the local deformation in a plastic zone and a joint core, the flexural deformation of a beam, the shear deformation of a joint core and the flexural deformation of a column to global deformation of the frame as well as their regularities are investigated. It is indicated that the truncation and embedded details of core steel had no obvious negative effect on the seismic behaviour of the specimens. The shear deformation of a joint core is increased because of the truncation and embedded details of core steel. The specimens with the two truncation and embedded details of core steel have almost same shear deformation of a joint core. This paper can be referenced by the nonlinear static pushover analysis of CSRC structures.更多还原