A Study on Stress-Strain Testing of Controlled Blasting Demolition of 210m Chimney

This paper describes the resistance strain test principle, and the stress-strain is tested for the 210m chimney blasting demolition, so as to determine the test scheme and analyze the test data, the test results show that the tensile strain withstood by the reinforcing steel bar in the chimney cut at about 0.1 seconds after detonation is up to 81.4με. Based on deformation coordination principle, the concrete also receives 81.4με tensile strain effect at this time. Due to elastic modulus of concrete E = 30GPa, calculated by σ = Eε, the tensile stress of the concrete in the tensile zone reaches an ultimate tensile strength σ = 2.4MPa, the concrete is destroyed, all the tensile forces are born by the reinforcing steel bars; the partial concrete in the compression zone is also at the yield state.