Experimental Study And FEM Analysis Of Cast-in-situ Insulation Composite Shear Wall

Cast-in-situ insulation composite shear wall is a new type of sandwish wall. Thesimilarity between it and the previous composite wall is that they are both comprisedof three layers: the internal and external concrete, the middle insulation layer, andthen through the connecting members, the two concrete layers behave as a whole.However, the difference is that there is holes in the insulation layer, which areinforcing bar goes through the hole. When constructing, the short reinforced concretecolumns has been formed since concrete fills in holes and wrap the stiffeners, whichenables a better connection between the two sides of the concrete. The composite shearwall characterizes with energy saving, light weight, low cost, good mechanicalperformance, market prospect etc.This paper studys on the mechanical properties of the cast-in-situ insulationcomposite shear wall, the main research contents and results are as follows:(1)Three sandwish blocks’ shear experiment were tested under vertical load, andrelative displacement between insulation layer and the two concrete layers wasrecorded, deformation characteristics with load increasing was observed, load-slipcurves was drew, then the calculated bearing capacity of the specimens was comparewith the theoretical value, which shows that, the deformation of the short reinforcedconcrete column, which connecting internal and external concrete layer, goes throughelastic-elastic-plastic-plastic stage under vertical shear load, thus the shortreinforced concrete column plays a very good role in the resistance of the shear stressbetween the inner and outer layer of concrete, the two layers of concrete can worktogether.(2)Three pieces of the composite wall’s axially compressive experiment wascarried out, so based on the failure process and failure feature, the cracking load andultimate load, the variation of concrete and steel’s stress and strain as the applied loadwas increasing, we can know that the reinforcing bar can resist the tensile stress orcompressive stress caused by the internal and external concrete layers if they are goingto separate or pressure together, so that the two layers of inner and outer concrete willnot be separated or crushed; Preliminary speculated that the axially loaded capacity ofcast-in-situ composite shear wall is equal to the same concrete thickness of the solidwall. (3)According to the static load test, the finite element analysis software ANSYSwas used to simulate the whole process of the cast-in-situ insulation composite shearwall from loading to destroy, and the simulated results were compared with the testfindings; Contrast models were set up and compared with the existing composite wallat the same time to demonstration the correctness of relevant experimental conclusionand the feasibility of the finite element analysis, which shows that after reaching theultimate strain, concrete is crushed,which leads in the destruction of the compositewall， and which confirms about the correctness of the speculated axially compressivecapacity formula, using Nu=0.9(fcA+fy’ As’)to calculate axially loaded strength isfeasible.