Experimental study on the biaxial mechanical behavior of normal concrete under non-proportion loading

Concrete structures are mostly working under multi-axial stress state.Stress paths are major factors which influence the mechanical behaviors of concrete.For concrete,the non-proportion biaxial loading tests were carried out in large dynamic-static tri-axial test system with 4 kinds of invariable lateral loading.The strength and strain are measured,the change rule of biaxial compressive strength and deformation for concrete under fixed lateral loading are obtained.Contrasting the test results with reference [1],it can be found that increase rules for both strength and deformation are different from that of proportion loading path.Test results demonstrate that the increase level of biaxial strength depends not only on the loading proportion,but also on the loading path.