（河南科技大学土木工程学院， 洛阳 471023）

［摘要］对9个内隔板式异形钢管混凝土节点试件进行了低周反复荷载试验，研究了该类节点试件损伤破坏全过程，得出节点域腹板肢钢腹板第一薄弱点、最薄弱点的位置，以及钢腹板全截面屈服时最薄弱点处残余应变发展规律。在此基础上，研究了内隔板式异形钢管混凝土节点试件位移延性系数、塑性发展系数和延性发展系数，分析了柱截面形状、柱截面肢高肢厚比、轴压比、节点域第一薄弱点位置、最薄弱点位置对内隔板式异形钢管混凝土节点试件延性的影响。结果表明：该类节点试件位移延性系数高于普通钢筋混凝土异形节点的位移延性系数，表现出良好的抗震性能；柱截面肢高肢厚比相同时中节点试件塑性发展系数小于角节点、边节点试件，随着轴压比的增大中节点试件塑性发展系数逐渐增大；柱截面肢高肢厚比相同时角节点、边节点试件延性发展系数小于中节点试件，最薄弱点出现在节点域中心附近的试件延性发展系数较小；柱截面肢高肢厚比为3时的中节点、边节点试件塑性发展系数、延性发展系数平均值大于柱截面肢高肢厚比为2时的对应值。

［关键词］异形钢管混凝土柱； 节点； 位移延性系数； 塑性发展系数； 延性发展系数； 材料损伤

中图分类号：TU398文献标识码：A文章编号：1002-848X(2019)16-0101-07

Research on material damage-based ductility of special-shaped  concrete-filled steel tubular joint with inner diaphragm 

Chen Xi， Jiao Yufeng， Guo Erwei， Bai Xiaohong

(School of Civil Engineering, Henan University of Science and Technology, Luoyang 471023, China)

Abstract:Nine joints specimens with inner diaphragm consisting of concrete-filled steel tubular special-shaped columns and steel beams were tested under the low cyclic loading. The damage failure process of joints specimens was studied.The appearing location of the first weak point and the weakest point at the steel web of the web\|pier of joints, and the development law of residual strain of the weakest point of joints as steel web of joints reached full section yield were given. On this basis, the displacement ductility factor, plastic evolution factor and ductility evolution factor of joints specimens with inner diaphragm consisting of concrete-filled steel tubular special-shaped columns and steel beams were researched. The influences of different parameters such as sectional shape of special-shaped columns,  the ratio of the height to thickness of section of column, axial compression ratio, the first weak point appearing location and the weakest point appearing location of joints specimens were analyzed. The results show that the displacement ductility factor of the joint specimen is higher than the common special-shaped reinforced concrete joint, and the joints specimens have good seismic performance. When the specimens have the same ratio of the height to thickness of section of column, the plastic evolution factor of intermediate joint specimen is less than the exterior joint specimen and corner joint specimen. With the axial compression ratio increasing gradually, the plastic evolution factors of intermediate joint specimen increase. When the specimens have the same ratio of the height to thickness of section of column, the ductility evolution factor of intermediate joint specimen is greater than the exterior joint specimen and corner joint specimen. The ductility evolution factors of the specimens were smaller, where the weakest point of joint specimen appeared in the centre steel web of joints. When the ratio of the height to thickness of section of column was 3, the average of the plastic evolution factor and ductility evolution factor of the intermediate joint specimen and corner joint specimen were greater than the specimens when the ratio of the height to thickness of section of column was 2.

Keywords:concrete-filled steel tubular special-shaped columns; joint; displacement ductility coefficient; plastic evolution coefficient; ductility evolution coefficient; material damage

*国家自然科学基金项目（51808195），河南科技大学博士科研启动基金(13480014)。

作者简介：陈茜，博士，讲师，Email：chenximy2013@163.com。