Improvement and Application of the Softened Strut-and-Tie Model

2017 4th International Conference on Advanced Materials, Mechanics and Structural Engineering

材料科学;机械制造

Fan, Guoxi^1 ; Wang, Debin^2 ; Diao, Yuhong^3 ; Shang, Huaishuai^4 ; Tang, Xiaocheng^5 ; Sun, Hai^1

School of Engineering, Ocean University of China, Qingdao, Shandong

266100, China^1

School of Civil and Safety Engineering, Dalian Jiaotong University, Dalian, Liaoning

116028, China^2

Shandong Zhuoyuan Architectural Design Co.Ltd, Qingdao, Shandong

266011, China^3

School of Civil Engineering, Qingdao University of Technology, Qingdao, Shandong

266033, China^4

School of Civil Engineering and Architecture, Northeast Electric Power University, Jilin, Jilin

132012, China^5

关键词: Beam-column joints;    Diagonal compressions;    Experimental research;    Inclination angles;    Moment resisting frames;    Reinforced concrete beam-column joints;    Softening coefficients;    Strut-and-tie model;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/269/1/012016/pdf
DOI  :  10.1088/1757-899X/269/1/012016

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Previous experimental researches indicate that reinforced concrete beam-column joints play an important role in the mechanical properties of moment resisting frame structures, so as to require proper design. The aims of this paper are to predict the joint carrying capacity and cracks development theoretically. Thus, a rational model needs to be developed. Based on the former considerations, the softened strut-and-tie model is selected to be introduced and analyzed. Four adjustments including modifications of the depth of the diagonal strut, the inclination angle of diagonal compression strut, the smeared stress of mild steel bars embedded in concrete, as well as the softening coefficient are made. After that, the carrying capacity of beam-column joint and cracks development are predicted using the improved softened strut-and-tie model. Based on the test results, it is not difficult to find that the improved softened strut-and-tie model can be used to predict the joint carrying capacity and cracks development with sufficient accuracy.