Structural Behavior On Joint Region Of Concrete-Filled Rectangular Tubular Column

Concrete-filled Square Tubular Structure has been used more and more popularly in the world. As the research of the joint property in this kind of structure is not enough, this paper mainly discussed the static property of frame column connection in concrete-filled square tubular structure, especially the load-carrying capacity of joint region.In the theoretical analysis, this paper used the limiting analysis method and the yielding system of the joint region given by the 'Technical Code for Concrete-filled Square Tubular Structure "(Draft). The mathematical formulas for determining joint shearing capacity and bending capacity were developed in this paper and also verified the analyzing result with experimental data. in the finite element method analysis, the constitutional relationships of steel and three-dimension compressed concrete were conducted by using increment plastic theory. In the paper a serious of joint models were analyzed by using the program ANSYS and the mathematical formulas for determination of load-carrying capacity of shearing and bending in the joint region were also given. At last the influence of many parameters to the load-carrying capacity in the joint region was analyzed and some suggestions were given for the design in the practical projects.