Study On Improvement Of Seismic Performance Of Side Corridor Frame With Infill Wall

Side corridor frame is widely used in the construction of primary and secondary schools.However,in many earthquakes,teaching buildings with side corridor frame are more seriously damaged than general buildings at the same place.Aiming at improving the seismic performance of teaching buildings with side corridor frame,this thesis attempts to apply a damping infill wall with high damping mortar damping layer and polyvinyl alcohol fiber-reinforced engineered cementitious composite(PVA-ECC)materials into side corridor frame.Taking the integrated teaching building of Xuankou middle school which collapsed in the "5 12" Wenchuan earthquake as a prototype,selecting frame structure with middle-truss,large-span infill walls as the most representative one,this thesis designed and manufactured one side corridor reinforced concrete(RC)frame with damped infill wall and one side corridor PVA-ECC/RC composite frame with damped infill wall.What's more,a repeated low cyclic loading test was carried out to detect its performance,including crack developments,failure patterns,bearing capacities,hysteretic curves,stiffness degradation rules,ductility coefficients and energy dissipation behaviors.Moreover,selecting appropriate constitutive relationship,element type and meshes,experiments were simulated by using the finite element analysis software ABAQUS to explore the impacts of the axial compression ratio,reinforcement ratio of columns and different regions using PVA-ECC on the mechanical property of side corridor frame with damped infill wall.The experiments and finite element analysis showed that:(1)Compared with conventional infill wall,damped infill wall has much greater deformation capacity,which can improve its failure pattern to some degree.At the same displacement angle,the damped infill wall suffers less damage,saving repairing costs in the earthquake.The damped infill wall has weaker stiffness effects and restraint effects on its main frame,alleviating the adverse effects.In addition,the better energy dissipation capacity brought by high-damping mortar layer can also mitigate damage.(2)Compared with RC frame,PVA-ECC/RC composite frame bears greater bearing capacity,higher ductility,greater stiffness degradation rule and energy dissipation behavior.Even at the ultimate displacement,it still has stable bearing capacity.Differing from RC column,the cement of PVA-ECC column didn't fall off and the rebar was still wrapped up by the cement.The side corridor PVA-ECC/RC composite frame with damped infill wall can meet the ductility demand about frame structure in standard.Considering that it can provide sufficient seismic collapse resistance,it is feasible to use PVA-ECC/RC composite frame in the constructional engineering of teaching buildings with side corridor frame.(3)The finite element model established by ABAQUS is able to simulate the experiment accurately.With the increase of axial compression ratio,the bearing capacity of the two frames increases,while the ductility decreases;with the increasing of the reinforcement ratio of columns,the bearing capacity of the both two frames increases and the ductility becomes better.Compared with PVA-EC/RC composite frame,axial compression ratio and reinforcement ratio have greater impacts on RC frame.