Experimental Research On The Seismic Performance Of Precast Integral Foam Concrete Shear Wall

Energy saving and environment protection has been attached with great importance all around the world for the warning of global energy deficiency.In China,the government has been actively advocating conserving energy and resources,implementing the regulations of energy conservation and emission reduction.As one of the most energy consuming industries,conserving energy in building industry sheds a significant impact on accelerating the development of national environment friendly society.The government has been promoting building industrialization and green building.Thus this paper originally designs a pre-cast integral foam concrete shear wall structure,which takes advantages of the widely recognized green and self-thermal insulation material,foam concrete.This foam concrete shear wall is intended to replace masonry structure in rural architecture,different from the traditional application of foam concrete in infill wall and block work.The construction of the pre-cast integral foam concrete shear wall is to substitute the blocks of the traditional masonry wall with precast integral foam concrete wall then cast in place the constructional column with foam concrete and the ring beam with commercial concrete convenient to connect with the floor.The foam concrete developed by our lab possesses high strength and favorable self-thermal insulation properties.The research and application of this precast integral foam concrete shear wall avail the improvement of the energy saving efficiency in rural architecture,bring about considerable economic and environmental benefits.As China is located at the junction of the circum-Pacific seismic belt and Eurasian seismic belt,the seismic region is large.Therefore the experimental research on seismic performance of this foam concrete shear wall is of great significance.Four piece of walls designed and constructed by varying axial compression ratio and height width ratio were carried out under low frequency cyclic loading test.The deformations,strain of rebar and concrete,the failure mode of the specimen were observed and attained during the experiment.Then through analyzing the hysteretic curve,bearing load,stiffness degradation,energy dissipation capacity and ductility,the influence of axial compression ratio and height width ratio on the seismic performance of the foam concrete shear wall can be concluded.As the axial compression ratio increases,the loading capacity and energy dissipation capacity increase,while the ductility factor decreases after increasing.As the height width ratio decreases,loading capacity and energy dissipation capacity of the foam concrete shear wall improve evidently,while the ductility factor decreases.In conclusion,the foam concrete shear wall possesses good seismic performance by rational design of the axial compression ratio and the height width ratio of the wall.The next part takes advantage of finite element software ABAQUS to carry out numerical simulation of the precast integral foam concrete shear wall.By modeling with concrete damaged plasticity,the failure mode,strain and stress of the concrete can be obtained.Comparing the simulation result and experimental result,conclusions can be made that the simulative failure mode and loading capacity are close to the experimental result,which proves the availability of the numerical simulation and the rationality of the experiment.In the meanwhile,Simulation analysis on changing the compression ration and the reinforcement ratio of the foam concrete shear wall were carried out.It can be obtained that the load capacity of the foam concrete shear wall increases first then decreases as the compression ration goes.When the height width ratio is 1.56,the optimal compression ratio of the shear wall is 0.2.And the reinforcement ratio improves the load capacity of the foam concrete shear wall as well.However this kind of improvement recedes as the compression ratio increases.In the end,final conclusions were drawn on the basis of the whole work and suggestions were given on follow-up research on this pre cast integral foam concrete shear wall.