The research of the failure criterion and one-dimensional stress-strain relationship of deteriorated concrete were carried out. Based on the damage mechanics theory, the dsmage which reflects the alternation of intern...The research of the failure criterion and one-dimensional stress-strain relationship of deteriorated concrete were carried out. Based on the damage mechanics theory, the dsmage which reflects the alternation of internal state of material were introduced into the formula presented by Desayi and Krishman and the weighted twin-shear strength theory. As a nondestructive examination method in common use, the ultrasonic technique was adopted in the study, and the ultrasonic velocity was used to establish the damage variable. After that, the failure criterion and one-dimensional stress-strain relationship for deteriorated concrete were obtained. Eventually, tests were carried out to study the evolution laws on the damage. The results show that the more freezing and thawing cycles are, the more apparently the failure surface shrinks. Meanwhile, the comparison between theoretical data and experimental data verifies tile rationality of tile damage-based one-dimensional stress-strain relationship proposed.展开更多
Suggests a general method based on the general solutions of the governing equations for the linear elastic medium to solve unilateral interface problems in terms of functional equations and discusses the supersonic wa...Suggests a general method based on the general solutions of the governing equations for the linear elastic medium to solve unilateral interface problems in terms of functional equations and discusses the supersonic wave field in detail for the two half planes problems, gives its analytical solutions and concludes that the solving procedures shown here can completely be applied to subsonic and transonic wave fields and other analogous problems.展开更多
文摘The research of the failure criterion and one-dimensional stress-strain relationship of deteriorated concrete were carried out. Based on the damage mechanics theory, the dsmage which reflects the alternation of internal state of material were introduced into the formula presented by Desayi and Krishman and the weighted twin-shear strength theory. As a nondestructive examination method in common use, the ultrasonic technique was adopted in the study, and the ultrasonic velocity was used to establish the damage variable. After that, the failure criterion and one-dimensional stress-strain relationship for deteriorated concrete were obtained. Eventually, tests were carried out to study the evolution laws on the damage. The results show that the more freezing and thawing cycles are, the more apparently the failure surface shrinks. Meanwhile, the comparison between theoretical data and experimental data verifies tile rationality of tile damage-based one-dimensional stress-strain relationship proposed.
文摘Suggests a general method based on the general solutions of the governing equations for the linear elastic medium to solve unilateral interface problems in terms of functional equations and discusses the supersonic wave field in detail for the two half planes problems, gives its analytical solutions and concludes that the solving procedures shown here can completely be applied to subsonic and transonic wave fields and other analogous problems.
