Study On Seismic Behavior Of Replaceable Steel Coupling Beam

With the continuous development of economy,the density of population is also increasing,and the area of construction land is also significantly decreasing.To solve this contradiction,high-rise buildings show great advantages.In today's practical engineering,reinforced concrete coupling beam is one of the most commonly used components in shear wall structure.But according to the test and observation,most of the components of this type will appear shear failure,which makes the degree of strength and stiffness degradation and energy consumption capacity not optimistic,and it is not easy to repair after the earthquake.In terms of energy consumption capacity and deformation,steel beam is superior to reinforced concrete It's made of soil.In the building,steel beam is used instead of reinforced concrete coupling beam.However,the joint area of steel coupling beam and shear wall is often seriously damaged,which makes the mechanical performance of shear wall worse,and it is very difficult to repair.In view of this,engineering experts put forward the concept of replaceable.In order to study the seismic performance of the replaceable steel coupling beam,this paper will select the steel coupling beam in the shear wall steel coupling beam system as the research object,design the steel coupling beam as replaceable,and then study its seismic performance.In this paper,three specimens were designed and tested under low-cycle reciprocating load.The failure process and failure mechanism of each specimen are observed,and then the hysteretic curve of steel beam is analyzed,The skeleton curve,ductility coefficient and energy consumption performance are obtained and analyzed.The results show that the failure of SJ1 occurs at the joint of flange plate and base plate of non replaceable steel coupling beam,and the failure of SJ2 and SJ3 occurs at the flange plate of replaceable steel coupling beam on non loading side.Under the same connection mode,the section height of the replaceable steel beam has a great influence on the seismic performance of the replaceable steel beam.The bearing capacity of the high section is 39.6% higher than that of the low section.At the same time,the energy consumption of high cross-section is increased by 4.6% compared with that of low cross-section steel beam.Under the same cross-section,the bearing capacity of bolted connection is increased by 12.7% compared with that of welding,but the initial energy consumption capacity is not different.In the later stage of loading,the stiffness and energy consumption are higher than that of welding.The finite element software is used to establish the model,and the model of the replaceable steel coupling beam is analyzed for earthquake resistance.Compared with the test results,it is found that the failure position of the test results is the same as the failure position of the finite element;however,with the increase of the load,due to the external conditions and the defects of the steel itself,the bolt slippage occurs,which makes the load displacement curve of the test pinch Phenomenon,this is not consistent with the load displacement curve obtained from the finite element simulation analysis,but the data combined with the test results can still be obtained: under the same section,the seismic resistance of flange plate bolted is better than that of welding;under the same connection form of two steel beams,the seismic resistance of high section is better than that of low section.