Experiment Study And ANSYS Parametric Analysis On Out-of-plane Bending Performance Of Superimposed Basement Wall With Embedded Foundation

To comply with the development of China’s housing industry, the prefabricatedstructures have become more and more popular to the market. It is proved that soilpressure make walls generate out-of-plane bending moments when superimposed wallsare applied in the basement walls, but the bearing capacity of structures will bedecreased because traditional base forms reduce section effective height ofsuperimposed wall at the bottom. So it results in bad impact for structure use andseismic performance, and the weakest part of destruction is horizontal patchworkbetween superimposed wall and base simultaneously. We rely on the Theme of NationalNatural Science Foundation of China (Seismic Behavior and Design Methods ofSemi-fabricated Reinforced Concrete Superimposed Wall Strucure50908071) toimprove the traditional base forms for embedded concaved base. By comparing with thestatic bearing-capacity experiment of two groups including four superimposed wallspecimens with different embedding depth, which the experiment simulates the workingconditions of basement wall with soil pressure, we research and evaluate the destructionmechanism, weak parts, bearing capacity, deformation capacity and so on.The experiment results show that the embedded depth has influence on the damageform of superimposed wall: for a smaller set of embedded depth, W-3and W-4causetensile punching failure of base for the phenomenon of reinforcement bond slip withinadequate anchorage length; for a larger set of embedded depth, W-1and W-2’sdestruction is concentrated on superimposed wall while embedded base is good, whichis verified that excellent embedded role. So it is observed that all specimens appear littlehorizontal crack along the superimposed interface, which is not completely throughcontinuous. From the phenomenon, precast concrete wall and the core area of the castconcrete can work together.We conduct ANSYS simulation and parameter analysis on basis of the experiment.It is reliable for the finite element analysis model and selected parameters thatsimulation results are in good agreement with experiment. Parameter analysis just takesthe specified part wall below the height of the inflection point to simplify soil pressureunder the circumstance of actual projects. Then the analysis selects embedded depth,cup-wall thickness, cup-bottom thickness, longitudinal reinforcement ratio andcoefficient friction for simulation, which results show that the main factors of capacityare the embedded depth and the longitudinal reinforcement ratio. Also by correcting the theoretical formula for bearing capacity, we can achieve new corrected formula in linewith actual application. So it indicates that parameter analysis has certain feasibility andreference value.For selection of embedded depth, we recommend Heevaluates from1.0h to1.2h forintegration with the code of home and abroad(China and Europe), which h is thethickness of superimposed wall. Then cup-bottom thicknesst2150mm, and cup-wallthickness t1is between150mm and250mm.