Experimental Investigation of Multiaxial Compressive Strength of Concrete under Different Stress Paths

Abstract

Many multiaxial failure criteria of concrete have been suggested based on the experimental results under proportional loading paths. To verify whether these failure criteria of concrete are applicable for nonproportional loading paths or whether multiaxial strengths of concrete are stress paths dependent, the strength behavior of concrete under nonproportional loading was investigated. An extensive experimental program involving the testing of 105 specimens was conducted. The stress paths used included four biaxial and two triaxial compressive stress paths. The multiaxial compressive strengths of concrete under these stress paths were compared with those under proportional loading. The condition in which the multiaxial compressive strength of concrete is not influenced by the stress path is discussed and concluded.