| The cast-in-place concrete sandwich insulation wall has the effect of heat preservation while satisfying the bearing capacity.The sandwich insulation wall proposed in this paper consists of three parts.The inner wall,the middle insulation layer and the outer wall are opened at the middle of the insulation board,and the micro-square concrete-filled short columns are used as connecting parts between the inner and outer leaf walls.The entire inner and outer leaf wall and the connecting member form a unitary structure,so that the wall is better co-deformed and co-stressed.In this paper,the mechanical properties of the sandwich insulation wall with new connectors are analyzed.The ABAQUS finite element software is used to simulate the sandwich wall with height 3000mm and width 1000mm.The analysis models under three stress states are established:in-plane Vertical and horizontal common force models,out-of-plane interaction models and models under shearing.Through the analysis of the force performance under several loads,the force characteristics of the new sandwich wall are more fully understood.Before analyzing the models under three stress states,the rationality of the model is first verified.By comparing with the reference specimens,the ultimate bearing capacity and failure morphology of the wall are close to the experimental results.Based on the above model,the BWQ1 and BWQ2 models with in-plane force are established.According to the maximum plastic strain cloud image obtained by finite element analysis,the concrete part of the sandwich wall is mainly damaged by the tension side,mainly occurring at the wall height of 1000mm.The following pull side.According to the SP1-SP3 model analysis of the out-of-plane force,the crack development of the sandwich wall under the plane load is the first to occur in the middle of the inner wall,followed by the damage on the middle and outer sides of the outer wall.After the thick inner blade is cracked,the stiffness is immediately degraded,and the internal force between the inner and outer blades is redistributed.The outer blade is cracked immediately after the load is increased,so the cracking load between the inner and outer blades is small.Finally,the shear model JXK1 was established.According to the stress cloud diagram of the JXK1 model,the concrete mainly bears the shearing force,and the steel pipe also bears the shearing force,indicating that the steel pipe and the concrete share the force.By changing the relevant parameters of different models,the simulation analysis shows that the in-plane bearing capacity of the sandwich insulation wall increases with the increase of the axial compression ratio,and the strength of the longitudinal reinforcement of the wall has an influence on the bearing capacity of the wall.The strength of the transverse reinforcement has no effect on the bearing capacity.The arrangement of the connectors has substantially no effect on the bearing capacity.When the total wall thickness becomes larger,the out-of-plane bearing capacity also increases.When the total thickness is the same,the greater the inner wall thickness,the greater the bearing capacity.When the front side is loaded,the sandwich wall has a greater bearing capacity. |
