Analysis On Seismic Behavior Of Semi-Rigid Conne-Ction Of New Type Concrete-Filled Square Steel Tubular Column And Steel Beam

Concrete-filled steel square tubular (CFRT) column has a simple structure, convenient of combination with other fittings and construction, in an increasingly wide range of engineering applications last several years. However, the corresponding researches of bearing capacity and seismic behavior of joints are not enough, and the joint form in the specification can also not meet the practical needs. With the country’s economy taking off, the more theoretical and experimental studies are imperative.Taking the convenience of architectural design and the construction difficulty into account, and drawing the joint form of the mandrel bolts, the paper presents new semi-rigid joints-"mandrel bolt-II-shaped plate joint". The form of this joint is full-bolts connection with the flexibility of installation. They overcome the unstable quality of welding in the construction site, and unfavorable factors of the high-altitude operations. They can also reduce labor costs, shorten the construction cycle, and reduce environmental pollution. Based on the tests of the semi-rigid joints of concrete-filled square steel tubular column under low cyclic reversed loading, the test phenomenon and the destruction process are observed and recorded. The data from the new joint is analyzed to study the stress distribution and the seismic performance. New joints improve the pathway of the forces from each other and enrich the semi-rigid joints form of the concrete-filled steel square tubular column-steel beam. The results show that the new joint has good ductility and energy dissipation capacity, better seismic performance.To compensate for the limitations of the experimental observations and reveal the internal details which are difficult to test from the test, and by the3D entity apdl language modeling analysis with a large general-purpose finite element ANSYS for the joint pilot, the model is divided into a regular grid through the reasonable segmentation. Meanwhile, it also takes the geometric, the material and the contact triple nonlinear analyses into account. After calculation, the hysteretic curves contrasted with the experimental curves form the CFRT are gained. Moreover, the corresponding indicators from the theory and the test are contrasted and analyzed. From the results of the computer simulation and experimental data, the new joint has a good seismic performance. The joint stiffness and seismic capacity can be controlled by adjusting the the∏-shaped plate, and this new joint, convenient and flexible, is worth promoting.