Mechanics Behavior Of A New Type Of Concrete-filled Steel Tubular Column Joints

With the development of technology and perfection day by day of the Concrete-Filled Steel Tube theory, The Concrete-Filled Steel Tube was gradually used by the building structure, especially used in the structure of high buildings. With the increasing height of the building, the application of the Concrete-Filled Steel Tube will be more and broader. Now the concrete-filled steel tubular column-beam joints became the pivotal technic problem of the new structure. There fore, the deep study on the dynamic behavior of the joins above-mentioned will contribute to promoting the structural design and engineering application. Test put forward a new type of concrete-filled circular steel tubular column with piercing reinforcing bar joints, including steel beam joints and reinforced concrete beam joints. Base on experimental and theoretical analysis, the dynamic behavior of this new type of joints between column and beams is researched. This thesis carried out following aspects:1. In the experiment there was twelve crisscross specimens has been designed, six of them are steel-beams figure as 'å·¥',the others are reinforced concrete beams joints. According the result of the experiment, the strength, ductility, stiffness attenuation, and energy dissipation of the new type of concrete-filled circular steel tubular column with piercing reinforcing bar joints under reversed loads was studied.2. Through changing the main factors of the joints, for example: the diameter and the amount of the piercing reinforcing bar, the style of the piercing reinforcing bar distributing and the axis load ratio, that the paper discussed which influenced the dynamic behavior of this new type of steel-concrete composite column joints. In addition the style of the steel-beam was analyzed for contrast bearing capability of the joint zone.3. The paper used the finite element software ANSYS to do the finite element analysis on the structure of the joints. Simulating the course of experiment the paper through doing the finite element nonlinear analysis of the beam end under cyclic loading got the distribution ofthe joints' strain.4. The finite element analysis results was compared with the data of the experiment. The comparisons show that the finite element model could be used to analyze this type of joint because of their good results. Then we can find out the predominance and the shortage of the new joints well and truly, and the conclusion draw from this paper can afford some rules and opinion of design.The test and the analysis show that this new type of joints can provide very high shear strength and excellent quake-resisting property and excellent quake-resisting property, and they can be used in engineering practice.