(1 长江大学城市建设学院，荆州 434023； 2 西安建筑科技大学土木工程学院，西安 710055)

［摘要］进行了5榀缩尺比例为1/4的框架中节点的低周反复加载试验，对不同混凝土强度等级、不同轴压比下型钢混凝土梁柱节点的受剪承载能力进行了研究。采用分离式三维实体模型，考虑各种材料的非线性及型钢与混凝土之间的粘结滑移，对型钢混凝土框架节点试件进行了有限元分析，并与试验研究结果进行了对比验证。通过有限元模型的参数调整进行了数值模拟，定量分析了高强混凝土脆性对节点受剪承载能力的影响。通过引入混凝土强度影响系数来考虑混凝土脆性增大对节点受剪承载力的影响，对《型钢混凝土组合结构技术规程》(JGJ138—2001)中计算公式进行了补充。

［关键词］型钢混凝土结构；高强混凝土；节点；受剪承载力

Shear capacity formulas of SRC frame joints considering brittle property of high strength concrete

Zeng Lei¹, Xu Chengxiang¹, Zheng Shansuo²(1 School of Urban Construction, Yangtze University, Jingzhou 434023, China;2 School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China)

Abstract:Cyclic loading tests were carried out on five 1/4-scale interior joints to understand mechanical characteristics and seismic behaviors of steel reinforced concrete frame joints. The test parameters taken into account were concrete strength and axial column load. Finite element analysis applying 3D solid elements and considering material nonlinear and bond-slip between steel and concrete was presented. Based on adjustment of model parameters in finite element analysis, the influence of brittle property of high strength concrete on the shear capacity was analyzed. The practical calculating formulas of shear bearing capacity of such joints were derived, in which the influence of concrete strength and axial column load were considered.

Keywords:steel reinforced concrete structure; high strength concrete; joints; shear capacity

国家自然科学基金项目(50378080)