Study On Constitutive Relationship And Failure Criterion Of Reactive Powder Concrete (RPC) Under Biaxial Compression

Reactive Powder Concrete (RPC) possesses excellent properties such as ultra-high strength, high toughness and high durability etc. Application of RPC for structural design can lighten the weight of buildings, improve structure durability and reduce the maintenance expense. RPC200 constitutive relationship is the foundation for nonlinear finite element analysis and research on structural design theory. As the particularity of producing principle and mechanics performance, conventional concrete constitutive relationship is unfit for RPC.In this paper, RPC200 constitutive relationship and failure criterion have been studied based on elasto-plastic theory and experimental investigation of RPC200 strength and deformation property under biaxial compression state. The results follow as:(1) Based on the test obtaining the failure strength and finding the difference failure performance between the different strain ratio under biaxial compression.(2) The stress-strain curve of RPC200 between different strain ratio is obtained under biaxial compression.(3) The envelope curve of peak stress in stress space and the envelope curve of peak strain in strain space are drawn under biaxial compression .They are the necessity that provide the development of design theories of RPC200 .(4) Through systemic experimental data, the failure criterion and the constitutive relationship of RPC200 are obtained under biaxial compression .(5) Analysis the whole failure process of RPC200 under biaxial compression .