Experimental Research And Finite-element Analysis Of The Mechanical Properties Of The Longitudinal Reinforcement Connection Of Precast Hollow-core Wallboard

In the field of housing construction in our country,fabricated building components represented by prefabricated hollow-core wall panels have been industrialized and applied.The industrialization of prefabricated buildings is to turn the whole building into a single component,which is produced by a processing plant and then transported to the site to be spliced into a whole.This paper mainly proposes two new methods for the connection of precast concrete hollow core wall panels and wall beams,and proposes a similar connection method for gypsum hollow core wall panels and wall beams,and conducts research on its force and seismic performance.The specific research content is as follows:(1)Design precast concrete hollow core wall panels in accordance with the "Technical Specification for Assembling Integral Reinforced Welded Wire Mesh Laminated Concrete Structures".The precast gypsum hollow core wall panels are existing wall panels.Reinforce the two wall panels according to the "Specification for Design of Concrete Structures".For precast concrete hollow core wall panels,two types of connection between wall panels and wall beams are proposed.One is to connect the wall beams by inserting longitudinal ribs on both sides of the concrete wall panel,and the other is to connect the wall beams through the precast concrete hollow core wall panel.The reinforced cages arranged in the cavity are connected by inserting the wall beams,and the gypsum hollow wall panels are connected in a similar way to the second connection method of the concrete hollow core wall panels.(2)Through monotonic loading and low-cycle reciprocating loading tests on precast concrete hollow-core wallboard and gypsum wallboard in different connection forms,the failure process and mode,bearing capacity,stiffness,and ductility of the three groups of wallboard after the test are obtained And performance indicators such as the strain of the steel bar at the connection position.The test results show that although the steel cage connection in the hollow cavity of the precast concrete hollow core wall panel has a bearing capacity of only 94% of the connection of the reinforcing bars in the wall,the ductility of the structure is 1.5 times,so it can be The connection method of the steel cage in the hollow cavity is extended to the actual engineering field.Gypsum hollow-core wallboard is superior to concrete wallboard in terms of bearing capacity and ductility.(3)Using ABAQUS software to perform numerical simulation analysis on the above three types of components,mainly from the stress and strain,hysteresis curve and skeleton curve of the components to compare and verify,the model calculation results match the test results.Based on the model of the connection mode in the hollow cavity,the influence of the ratio of longitudinal reinforcement in the cavity and the indirect overlap height of the rebar in the cavity with the outer wall on the mechanical performance of the specimen is analyzed.The simulation results show that the higher the reinforcement ratio of the longitudinal reinforcement in the hollow cavity,the greater the bearing capacity of the specimen;the longer the indirect lap length of the inner and outer rebars,the higher the energy dissipation capacity and the bearing capacity of the specimen.