传统风格建筑钢结构双梁-柱中节点抗震性能试验研究及有限元分析

EXPERIMENTAL STUDY AND NUMERICAL ANALYSIS ON ASEISMIC PERFORMANCE OF STEEL DOUBLE-BEAMS-COLUMN INTERIOR-JOINTS IN TRADITIONAL STYLE BUILDING

设计并制作了4个比例为1∶2的传统风格建筑钢结构双梁-柱中节点模型,通过低周反复荷载试验研究其抗震性能,得到了传统风格建筑钢结构双梁-柱中节点的破坏形态、滞回特性、延性等指标。研究表明:传统风格建筑钢结构双梁-柱中节点试件在加载过程中形成了上、下2个小核心区和中间短柱三个区域,其典型破坏形态是节点下核心区在压剪复合应力作用下的剪切破坏。试件变形以下核心区最大,其次为中间短柱。基于试验研究,利用有限元软件ABAQUS对其进行了非线性数值模拟分析,得到的节点破坏形态、应力分布及滞回曲线与试验结果较为吻合。

Four specimen models in 1/2 scale of steel double-beams-column interior joints of a traditional style building were designed and fabricated for a low cyclic reversed loading test. The failure mode, hysteretic performance, and ductility of the joints were obtained from the experiment. It is shown that there are 3 small core areas, namely an upper core area, a lower core area and a middle short column, appeared in the steel double-beams-column in the traditional style building during loading. The failure mode of the doublebeams-column joints is the shear failure when they are subjected to axial load, bending moment and shear force in the core area. The maximum deformation firstly occurred in the lower core area, secondly in the middle short column. Based on the experiment, the nonlinear numerical simulation was conducted using the ABAQUS software. The computational results such as the failure modes, stress distributions and hysteretic loops are in a good agreement with the experimental ones.