No-Linear Fem Analysis On Low-Slenderness Coupling Beams With Steel Fiber Reinforced Concrete

Because of the functional needs and some restricted factors,the modern high-rise buildings usually appear coupled shear walls. As a link bar, the coupling beams have a very important role to connect the fear walls.It can consume seismic energy in earthquake and finally protects the main structure avoiding serious damage.Usually seismic performance of the normal coupling beams satisfy the seismic requirement in high-rise building design.But the low-slenderness coupling beams are easy to occur shear failure for the larger shear on both ends of the beams and it can’t consume seismic energy fully.In order to study how to improve the performance of the low-slenderness coupling beams,the domestic and foreign researchers study it from three fields:changing the way of reinforcement,build-in damper,adding the fiber.Although, the former two can better improve the performance of coupling beam,but economical efficiency is not good and construction is more complicated.So they are not convenient to be applied in a large number of practical engineering. This paper makes a comprehensive analysis on the performance of the coupling beam that adding steel fiber.The analysis results have certain reference value about the improving construction of low-slenderness coupling beams.Firstly, based on existing experiment,this paper simulates some models using the separate simulation method by non-linear finite element analysis software ABAQUS,then,compares and studies the experiment result and simulation data from bearing capacity,ductility performance, dissipation ability,concrete damage and hysteretic curve.It fully proves that this simulation process is effective.Then, under the low-cyclic reversed load and monotonic loading, the paper builds many models to compare.And using the ABAQUS to help more deep analysis factors affecting the performance of the low-slenderness steel fiber reinforced concrete coupling beams.The factors include span-depth ratio,longitudinal reinforcement ratio and stirrup ratio.Summing up the better reinforcement scheme.Lastly,the test explores that how much stirrup space is changed between the low-slenderness steel fiber reinforced concrete coupling beam and ordinary concrete coupling beam by referring to the structural requirements of seismic code.this can be achieved to improve construction difficulty of the low-slenderness coupling beam and reduce consumption of stirrup.