Study On The Seismic Behavior Of Steel Frame With Steel-concrete Composite Beams Based On ABAQUS

In recent years, the composite structures have developed rapidly in our country.The steel frame with the steel-concrete composite beams is one of the important andcommonly used forms of composite structures. After welding the shear connectors onthe steel beam flange, we cast concrete slab on the steel beam, so that the reinforcedconcrete flange plate and the steel beam can work together. The steel frame with steel-concrete composite beam is composed of composite beams and steel columns(composite girder steel frame for short). China is a seismically active country, the5.12Wenchuan earthquake caused great casualties and a large number of houses damage andcollapsed, which made us aware more profoundly of the importance and urgency of theresearch on structure seismic performance. However, the seismic performance researchof the steel-concrete frame structure is not sufficient so far. The joint is a key part offrame structure, which requires focused research separately. This subject is under theauspice of the National Natural Science Foundation of China (50978074). In this paper,by using finite element analysis software ABAQUS, the seismic performances of thesteel frame with the steel-concrete composite beams and its joint (composite joint forshort) are studied. The following jobs are mainly finished in this paper:1) The software ABAQUS is used to analysize two composite joints (a side columnjoint and a middle column joint) under the cyclic loading at the end of the beam.Compared with the pseudo-static test results, and verify the results with each other.Finally, a more precise composite joint model used for seismic performance research isobtained by modifying the finite element model;2) Based on the composite joint model which has been verified, we study on theseismic performance of the composite joints under cycle load in detail. A pure steelframe joint model is created to compare its seismic performance with composite joint.In this paper, the mechanical properties and the hysteretic energy dissipation capacity ofthe two kinds of joints under the cyclic load are compared and evaluated. We concludedthat the bearing capacity and the seismic energy dissipation capacity of composite jointare significantly improved compared with pure steel joint; 3) The parameter analysis of the composite joint is discussed. The mainlyparameters include the reinforcement ratio of concrete slabs, concrete slab thickness andheight of steel beam. The mechanical performances and seismic energy dissipationcapacity under the cyclic loading are compared. According to the results, the seismicdesign recommendations of the composite joints are put forward;4) The elasto-plastic time history analysis for a single specimen steel frame withcomposite beams is studied, and a pure steel frame is compared. The dynamic timehistory analysis selects three ground motion time history curves in accordance with therequirements of seismic code. The stress distribution, the displacement (angle) betweenfloors of the composite frame and the interlayer shear forces distribution are gettedunder the action of ground motion time history curves. According to the analysis results,the weak link parts are determined, which can provide necessary theoretical basis forseismic design of the steel-concrete composite frames.