Study On The Seismic Performance Of Replaceable Steel Coupling Beam-hybrid Composite Shear Wall Subassemblies

Coupled shear wall is an efficient and promising lateral load resistant system.To achieve even better seismic performance and rapid function restoration after earthquakes,a new hybrid coupling wall system consist of steel plate composite shear wall piers and replaceable steel coupling beams was proposed.And the experimental study on the seismic performance of the composite shear wall have been presented.The main contents are listed as follow:(1)Five half-scaled hybrid coupling wall subassemblies with integral coupling beam and steel plate composite shear wall piers were tested under low cyclic loading in order to study the influence of the aspect ratio and stiffener span on seismic behavior of the subassemblies.The results showed that:(a)All hybrid subassemblies showed “strong shear wall piers-weak beam” failure mode and exhibited quite satisfactory performance,including high strength and stiffness,excellent ductility and stable hysteretic behavior.(b)With the decrease of the span depth ratio of coupling beam,the failure model of steel beam changed from bending failure of the end of beam to shear yield failure of web.(c)With the decrease of the span depth ratio,the bearing capacity and initial elastic stiffnes of the specimen has increased.(d)The stiffener can significantly improved local buckling phenomenon of the steel beam in large displacement angle.(2)Four hybrid coupling wall subassemblies with replaceable coupling beam and steel plate composite shear wall piers were tested under low cyclic loading in order to study the feasibility of replaceable construction and its influence on the seismic behavior of specimens.The replaceable construction is composed of end plate and high strength friction bolt,which is divided into two types: General construction A and Enhanced construction B.The results indicated that:(a)Replaceable construction of two specimens are reasonable and feasible.The damage location of two subassemblies with replaceable steel coupling beam components concentrated in the replaceable energy dissipation device.And it's easy to realize in situ replacement at a rotation angle of about 0.02 rad.(b)The repaired specimens possess almost identical performance with their former counterpart specimens,which indicates the reasonabledetails of replacement for the steel coupling beams.(c)The replaceable construction A has a slight weakening of energy dissipation because of the obviously opened and Relative slip of the face plate under large displacement angle.(d)The seismic performance of the specimen with enhanced construction B is not weaker than the whole steel beam.And there is no slippage during the cycle loading.(3)A refined finite element model of steel coupling beam-hybrid composite shear wall subassemblies has made by large general finite element software ABAQUAS.Nonlinear numerical simulation of the experiment has been carried out.The numerical results were in good agreement with the experimental results.On this basis,the influences of another parameters of the steel beam-hybrid composite shear wall were studied by numerical calculation in order to enrich and supplement experimental study.