公开(公告)号：US20210334431A1

公开(公告)日：2021-10-28

申请号：US16492949

申请日：2019-04-24

Applicant: CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Lei Wang ,  Lizhao Dai ,  Jianren Zhang ,  Xuhui Zhang ,  Yafei Ma

IPC: G06F30/20 ,  G01N33/38 ,  G01N17/00

Abstract: The present invention provides a method for predicting prestress loss after concrete cracking along strand. Corrosion-induced cracking is modeled by the thick-wall cylinder theory, the expansive pressure is evaluated with the residual tensile stress by cracked concrete and confining stress by un-cracked concrete during concrete cracking process. Considering the effect of strand corrosion, the bond strength of corroded strand is evaluated from the contributions of adhesion stress, confinement stress and expansive pressure. A method for prestress loss in corroded pre-tensioned concrete member is proposed with the strain compatibility and force equilibrium equations, incorporating the coupling effects of concrete cracking and bond degradation. The present invention proposes a method for predicting the prestress loss after concrete cracking along strand, which can incorporate the coupling effects of concrete cracking and bond degradation. It has a great significance to evaluate the prestress loss in existing pre-tensioned concrete beams.