Experimental Study On Seismic Behavior Of L-shaped Reinforced Concrete Filled Steel Tube Composite Column Connected By Plates

Under the premise of satisfying the requirements of bearing capacity,the concrete filled steel tube composite column can not only perfectly wrap itself in the wall,but also give full play to the advantages of the concrete-filled steel tube composite column structure,which has been an important part of the prefabricated building structure.However,there are some problems with large amounts of welding and high construction difficulty in several forms of concrete-filled steel tube composite columns.To simplify the construction method,better meet the actual construction needs,and promote the development of prefabricated buildings,this paper proposes a new type of a composite column of battened slab concrete filled steel tube by changing the connection mode and studies the seismic performance of this type of composite column.Based on this,this paper mainly studies the following contents:(1)According to the actual requirements of the project,six L-shaped reinforced concrete filled steel tube composite columns connected by batten plates with 2/3 scale were designed with the area of the battened plate and the layout of the battened plate as the parameters,and the effects of the area of the battened plate,the axial compression ratio and the form of the battened plate on the horizontal bearing capacity and seismic performance of the composite column were studied,and the specimens were made according to the design requirements.(2)Used finite element analysis software ABAQUS,seismic performance of L-shaped reinforced concrete filled steel tube composite columns connected by batten plates,finite element simulation analysis under vertical load,the cycle loading of the model,and according to the different set of parameter Settings batten plate area,axial compression ratio and batten plate decorate a form,got size model in the process of bearing capacity,failure pattern,hysteresis curves and skeleton curve,analyzes its seismic performance.(3)The specimens were tested under a low cyclic load,and the failure modes were observed.According to the experimental results,the data of displacement meter,static strain,bearing capacity,hysteresis curve,skeleton curve,ductility performance and energy dissipation capacity were analyzed.The experimental results and finite element analysis results were compared to analyze the feasibility of using the finite element to simulate the stress of solid components.The results showed that L-shaped reinforced concrete filled steel tube composite columns connected by batten plates had good seismic performance and energy dissipation capacity.With the increase of the battened plate area,the bearing capacity increased gradually,but the increase amplitude first increased and then decreased.The bearing capacity and ductility were decreased with the increase of the axial compression ratio in a certain range.When the area of the battened plate was the same,the better seismic performance could be obtained by increasing the proportion of the area of the battened plate.