| With the transformation and upgrading of the traditional building form to the new structure form,the fabricated building structure has been widely recognized by the market with the advantages of high level of factory production,controllable component quality,shortening the construction period and saving resources.The composite shear wall is one of the important structural components of the prefabricated building structure.Because the single-sided composite shear wall is a new structural form of the composite shear wall structure,the relevant research is very scarce,so it is necessary to study the seismic performance of this type of structure.Two full-scale specimens of single-sided composite shear wall are made,in which the specimen S-1 is formed as a whole by precast slab through lattice reinforcement and post cast-in-place concrete slab,the specimen S-2 is sandwich thermal insulation wall panel,the structure of load-bearing inner leaf panel is the same as that of specimen s-1,the outer leaf panel is non load-bearing thermal insulation protection layer,and the inner and outer leaves are connected by FRP.The seismic performance of two shear walls under low cyclic reciprocating load is studied,and compared with the test of cast-in-place shear wall panel completed by the research group.Finally,the finite element program OpenSees is used to carry out the finite element research,and the specific research contents are as follows:(1)Two specimens were tested under low axial compression ratio with low cyclic horizontal reciprocating loading,and the test phenomena,crack development,bearing capacity change,displacement and reinforcement strain of each test point were observed.Both the cast-in-place shear wall and two single-sided composite shear walls were damaged by bending and shearing.There was no obvious slip between the post cast layer concrete and the prefabricated wall panel,and the composite surface was well connected.(2)The hysteretic characteristics of prefabricated composite shear wall and cast-in-place shear wall are stable,and the shape of hysteretic loop is similar and full.The bearing capacity and rigidity of prefabricated composite shear wall and cast-in-place shear wall are basically the same,but the ductility is reduced.The average value of the displacement angle at the limit apex of the prefabricated composite shear wall is 1 / 95 and1 / 94 respectively,which meets the requirements of the limit value of the interlayer displacement angle under the large earthquake of the shear wall structure.The energydissipation coefficient of the two prefabricated shear walls is similar,which shows that the energy dissipation capacity of the two prefabricated shear walls is basically the same.(3)There is no crack in the whole test process of the precast concrete outer leaf plate.The test phenomenon,bearing capacity and rigidity of the two components are compared comprehensively.The results show that the thermal insulation layer and the outer leaf plate have little influence on the bearing capacity and rigidity of the wall plate.(4)By using the finite element program OpenSees,the hysteretic curve,skeleton curve and stiffness degradation curve of the shear wall are obtained.The simulation results are basically consistent with the test results,which lays a foundation for parameter analysis.(5)The results show that with the increase of the concrete strength,the bearing capacity of the wall is improved,and the residual deformation is also slightly reduced;with the increase of the ratio,the stiffness of the three stages of the shear wall shows a downward trend,and the smaller the ratio of height to width is,the more obvious the stiffness of the test piece is. |
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