Experiments And Theory Study On The Seismic Behavior Of Composite Shear Wall Structure System With Permanent Thermal-insulation Wall Form Of Glazed Hollow Beads

The composite shear wall structure system with permanent thermal-insulation wall form of glazed hollow beads is a new structure system with thermo-insulation function in order to adapt the need of energy-saving building.By using thermal-insulation blocks of glazed hollow beads as permanent wall forms,according to shear wall designing style configure horizontal and vertical double-layer steal mesh inside the wall form,and self-compacted concrete is filled in site along the upper chamber of wall form,all construct a composite shear wall.This structure system has good thermo-insulation function and can attain self-thermo-preservation;as for structure character,this structure is a slitted shear wall,which has the excellent seismic behavior,and can realize the seismic structural control.Therefore,this structure can be applied abroad in multi-story and mid-high-story public buildings and residential buildings.In order to investigate the seismic performance of the composite shear wall structure system with permanent thermal-insulation wall form of glazed hollow beads,based on the previous research,the shear wall with this structure was used as study object;the test and numerical simulation and theory analyses were carried out under low period to-and-fro loads in order to confirm bearing capacity of the structure and discover the effects of different parameters to the bearing capacity and seism-resistant character.This can offer basic data for internal force calculation,designing methods and construct measures.The main contents of the paper are as follows:1.The experiments of composite shear wall and common shear wall with different ratio of shear and span were carried out under low cyclic repeated loading.The failure modes,bearing capacity,hysteretic curve,lateral stiffness and ductility of two kinds of structures were compared and analyzed.The results showed that under the vertical loads and cyclic loading,the lateral bearing capacity of composite shear wall was a little lower than the common shear wall structure,however,the hysteretic curve of the former was better than the latter,presenting the composite shear wall structure has better capacity of energy dissipation and ductility.As for the failure modes,the composite shear wall had separate crack-developing zone,not severe than the common wall.The permanent wall form had certain confining and reinforcing action to the shear wall,which made the wall breakage with prolonged time.2.Based on the experiments,the finite element analysis with software ABAQUS was used to compare the structure of the composite shear wall and the common shear wall by nonlinear elastic-plastic analysis.The effects of axial compression ratio,shear span ratio,wall thickness,reinforcement ratio and concrete strength grade to the two kinds of structures were studied systematically.The finite element analysis result had good match with the experiments.The pre-designed vertical slit made the shear wall structure better energy dissipation capacity,however the horizontal bearing capacity dropped.By adjusting the geometry parameters of wall form,with high side movement rigidity and bearing capacity,the energy dissipation capacity was improved remarkably.3.By using the whole shear wall model and wall board column model,the horizontal bearing capacity of composite shear wall structure was studied in theory.Based on the wall board column model,the horizontal bearing capacity calculation formula of composite shear wall structure was derived.According to two different kinds of models,three horizontal bearing capacity calculation formulas of composite shear wall structure with different shear span ratio were advised.The results showed that different composite shear wall with different shear span ratio had different simplified calculation model to confirm the bearing capacity of the structure.4.By experiments,theory deduction and numerical simulation analysis,the main factors influencing the seismic behavior of the composite shear wall structure were confirmed,including shear span ratio,axial compression ratio,reinforcement ratio and the wall thickness etc.Based on the all kinds of factors on the bearing capacity and seismic character of the structure,the designing advices of the structure wall composition were put forward in the paper,which could offer basis for system design,establishment of relevant standard and criterion,application of the self-thermo-preservation structure system.