Research On The Load-bearing Capacity Of Composite Shear Wall Structure System Based On The Low-cyclic Load Test

A kind of new structure system,composite shear wall with thermal insulation wall form of glazed hollow bead is put forward based on the requirements of building energy conservation and materials innovation.The structure system shows obvious advantages in terms of seismic performance,economic design,which has received the praise of national experts.In this thesis,the seismic performance of composite shear walls is further studied and the ultimate load-bearing capacity formulas of the new system are determined by experimental study and theoretical derivation.The main completed works are as follows:1.The low-cyclic load test of the composite shear wall with thermal insulation wall form of glazed hollow bead has been designed in terms of test principle,specimen design,.data acquisition program,loading method etc.2.A total of 11 composite shear wall specimens have been divided into groups in accordance with different shear span ratio,axial compression ratio and reinforcement ratio.By the low-cyclic load test,the specimens of different parameters have been investigated in terms of failure mode,load-bearing capacity,stiffness,ductility and hysteretic energy dissipation capacity,which also make a comparison with the ordinary concrete shear wall.In addition,the failure mechanism and energy dissipation mechanism of the composite shear wall are analyzed.The test results demonstrate that as follows:1)Compared with ordinary concrete shear wall,ductility and energy dissipation capacity of the composite shear wall can be improved obviously under the condition of load-bearing capacity decreasing only 70%～100%.The system not only meets the requirements of the first level of seismic fortification,but also has structural redundancy which be in line with the design goal of multi-channel seismic line of defense.2)The shear span ratio is the main influence factors of ductility capacity of the composite shear wall.With shear span ratio increasing,the composite shear walls are characterized by better ductility and more energy dissipation.Increasing axial compression ratio can improve the load-bearing capacity of small shear span ratio walls to a certain extent.Besides,increasing reinforcement ratio can also improve the load-bearing capacity significantly,but reducing ductility at the expense.3.On the basis of the test data,the thesis does an analysis of stiffness and load-bearing capacity calculation,proposes load-bearing capacity formulas based on wallboard-column model of composite shear wall,which is proved to be feasible while comparing calculation values with test values.At the same time,the thesis gives the necessary design proposals based on theoretical analysis and test research.