| Superimposed slab shear wall is a structural component system formed by placing two precast concrete thin plates in the construction site,and then pouring concrete into the cavity formed by the two thin plates.In this paper,the composite plate shear wall is taken as the experimental research object,and its ultimate bearing capacity is studied through theoretical analysis,experimental research,finite element simulation and Origin data fitting.The main contents are as follows:In this paper,six composite plate shear walls and one cast-in-place shear wall with the same size and the same reinforcement ratio were designed and manufactured for the two structural interfaces of full transverse rib + horizontal tensile bar(replaced by full transverse rib below)and vertical rib + vertical continuous bending bar(replaced by vertical rib below).The influence of the contact surface between the precast part and the cast-in-place part on the axial bearing capacity and integrity of two kinds of composite plate shear wall was studied.The failure modes,bearing capacity and integrity of the two kinds of composite plate shear wall were compared with the castin-place shear wall through the axial test.The influence of the number of transverse ribs,the number of vertical ribs,the ratio of prefabricated reinforcement,the tensile reinforcement and the strength of prefabricated concrete slab on the bearing capacity of two kinds of interfacial structures is analyzed.The results show that the average ultimate bearing capacity of the composite plate shear wall of the two kinds of interfacial structures is 95% of that of the cast-in-place shear wall.The ultimate bearing capacity of specimens with vertical ribs is closer to the ultimate bearing capacity of insitu shear walls.The stiffness of the specimens with vertical ribs is larger than that of the composite plate shear wall with full transverse ribs,and the vertical deformation is smaller.When the two kinds of composite slab shear walls reach the limit state,the precast thin plate and cast-in-place part of wall core still maintain integrity.Based on the experimental phenomenon and data of superimposed slab shear wall,finite element software ABAQUS was used to simulate and analyze the process of the designed superimposed slab shear wall under axial compression.The simulated data had high accuracy with the test,and the stress and strain positions and sizes had high coincidence degree.The results show that: The influence of friction between the prefabricated part and the cast-in-place part needs to be considered.By defining the contact surface,the value of penalty function is changed and different function values are established for simulation.It is found that the penalty function has the greatest influence on the load before 0.5,and the bearing capacity of specimens increases linearly between 0.5 and 0.9.When the function value is set to 0.9,the difference between the ultimate bearing capacity and the test is 0.5%.On the basis of the model is proved reasonable and further studied the multi-factor coupling and the single factor’s influence on the composite plate shear wall,the results show that the ultimate bearing capacity of the specimen is not a single factor simple data overlay,various factors under the effect of coupling the ultimate bearing capacity of the specimen change are easing,specimen has a greater security reserve;In the analysis of the influence factors of the multi-factor coupling effect on the bearing capacity of the new composite slab shear wall,the concrete strength has the greatest influence on the bearing capacity,the number of vertical ribs has less influence on the bearing capacity than the concrete strength,and the number of transverse ribs has the lowest influence.Based on the numerical analysis and fitting of the ultimate bearing capacity,a formula for calculating the axial bearing capacity of composite plate shear wall with vertical ribs is proposed. |
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