The Seismic Behavior Study Of135Degree L Form Reinforce Concrete Column Joints

Reinforced concrete special-shaped columns structure system， because of the thickness ofcolumn appendage and wall is consistent that it can avoid the disadvantage of the ordinaryrectangular column which bulged inside corner in the room,it has good building function, meetsthe requirements of the building beauty, so special-shaped column structure is widely used inhousing construction in our country. Special-shaped columns nodes as the seismic weak parts ofthe seismic performance of the special-shaped column structure, research about it has importantsignificance in theory and practice.Scholars at home and abroad did a lot of test and theoretical study on the commonspecial-shaped columns nodes, had obtained some research achievements, but the research aboutspecial-shaped columns nodes which has special angle section form is less. Special-shapedreinforced concrete columns nodes with135degrees L section form is appeared in the actualengineering (Dalian castle hotel project), through simulation of seismic action by the low cyclicload in this paper, carried on numerical simulation analysis of the aseismatic performance for sixspecial-shaped columns nodes with135degrees L section form,studied the influence factors ofSeismic performance of the special-shaped columns nodes,such as the beam section size, beamreinforcement, axial compression ratio,stirrup volume ratio in the core area, concretestrength,and so on. The results showed that although the high axial compression ratio canimprove the ultimate bearing capacity of the special-shaped columns nodes, the ductility andenergy dissipation capacity of it was lower than the low axial compression ratio. In otherconditions remain unchanged, the improvement of the concrete strength can improve theductility and energy dissipation capacity of the nodes to some extent; strengthen the stirrupvolume ratio in the core area appropriately can also improve seismic performance of the nodes tocertain extent.Through comparative analysis between special-shaped columns nodes with135degrees Lsection form and ordinary special-shaped columns nodes (with T, cross and L form),analysisshows that the ductility and energy dissipation capacity of the beam-column joints in thereinforced concrete special-shaped columns structure system has something to do with thecolumn section form; the energy dissipation of the beam-column nodes with135degrees L section form is weaker than other beam-column nodes with other section form,so we shouldstrengthen reinforcement appropriateiy in structure design.