Research On Seismic Performance Of The Prefabricated Single-Sided Laminated Insulation Integrated Concrete Shear Walls

This article presents a prefabricated single-sided overlaid insulated integrated concrete shear wall,which consists of insulation boards on the outer side and prefabricated panels on the inner side connected by nylon connectors.The wall applies external insulation and formworkfree technology,which improves the overall quality of the building and construction efficiency,achieving the integration of insulation,decoration,and structure.To study the seismic performance of the Prefabricated single-sided overlaid insulated integrated concrete shear wall,quasi-static test studies were carried out on three single-sided overlaid shear walls with a shear span ratio of 1.9 and one cast-in-place shear wall.A finite element model of the prefabricated single-sided overlaid insulated integrated concrete shear wall was established using ABAQUS software,and parameterized analysis was carried out based on the verification of the accuracy of the model.The main research contents and results are as follows:(1)The study investigated the failure mode and seismic performance of the prefabricated single-sided overlaid insulated integrated concrete shear wall through quasi-static test.The results showed that the failure mode of the single-sided overlaid shear wall was the same as that of the cast-in-place shear wall,which was flexural-shear failure.The prefabricated and cast-inplace parts of the single-sided overlaid shear wall were effectively tied by truss reinforcement and nylon connectors,and their collaborative performance was excellent.The prefabricated single-sided overlaid insulated integrated concrete shear wall exhibited good seismic performance.Although its ductility was slightly lower than that of the cast-in-place shear wall,its bearing capacity and energy dissipation capacity were improved.(2)A detailed model of the refabricated shear wall was constructed using the ABAQUS finite element software,which considered the damage at the overlapping interface and the bond slip between concrete and steel reinforcement.The accuracy of the model was verified by comparing the simulated load-displacement curve and damage cloud diagram with experimental results.(3)Based on the verification of the finite element model,the connection method of singlerow reinforcing bars is compared,and a parameter analysis is carried out to study the effect of reinforcing bar diameter,spacing,and overlap length on the seismic performance of Prefabricated single-sided composite insulated concrete shear walls.The results show that increasing the diameter and number of reinforcing bars can improve the bearing and deformation capacity of the wall,while the effect of the overlap length of the reinforcing bars is relatively small.(4)Based on experimental data,the bearing capacity and ultimate displacement of the single-sided overlapped shear wall are verified,and proposed calculation formulas for yield load,peak load,and ultimate displacement.In the theoretical calculation of the peak load,the compressed concrete zone is divided into the constrained and unconstrained zones,and the ratio of the calculated theoretical value to the experimental value is between 0.93 and 0.95.When calculating the ultimate displacement,the influence of both shear displacement and bending displacement of the shear wall should be considered,and the shear displacement accounts for about 14% of the total displacement.In addition,by calculating the wind load at different building heights,design suggestions for the arrangement and form of insulation nails in the assembly-type single-sided overlapped insulated concrete shear wall are proposed.