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Experimental Study on Shear Transfer Performance of Uncracked Monolithic Steel Fiber Concrete
Qing Zhi,Jingang Xiong,Wenjie Yang,Sha Liu 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.12
Shear transfer performance at interface of steel fiber reinforced concrete (SFRC) is of great importance that many factors influence the shear transfer performance of SFRC such as concrete strength and aggregate interlock, reinforcement dowel action and steel fiber. Many studies have focused on part of the factors. The shear transfer performance of uncracked monolithic SFRC is studied in this paper by considering the combined effects of cohesion, clamping stress, confined stress, reinforcement, and steel fiber. Thus, this study presents a series of direct shear tests by Z-type push-off specimens. The direct shear strength, failure mode and failure process of plain SFRC and reinforced SFRC are studied, and their shear stress-slip and shear stress-crack width responses of the tested specimens are obtained. Test results showed that reinforcement and steel fibers can improve the ductile behavior and shear strength of the shear interface simultaneously. And shear stress-slip and –crack curves of the test specimens with those combined effects are strongly nonlinear. Finally, based on the existing shear strength calculation model and the test results of this paper, a shear transfer calculation formula of SFRC interface is proposed and verified according to the Mohr Coulomb failure criteria.
Yi Xu,Chen Jin,Shubin Qiao,Yongjian Wu,Hongbing Yan,Kefei Dou,Bo Xu,Jingang Yang,Yuejin Yang 대한심장학회 2018 Korean Circulation Journal Vol.48 No.8
Background and Objectives: Over the past decades, transradial approach for percutaneous coronary intervention (PCI) has been increasingly adopted in clinical practice. Women represent a large population who will possibly benefit from PCI, but they are often under-represented in clinical studies. Therefore, the role of TRI in women remains to be further defined. This study sought to compare safety and efficacy for transradial intervention (TRI) and transfemoral intervention (TFI) in women undergoing PCI in China. Methods: The study population consisted of 5,067 women undergoing PCI at Fuwai Hospital, Beijing, China between 2006 and 2011 (TRI: n=4,105, TFI: n=962). Incidence rates of clinical outcomes during hospitalization and at 1-year follow-up were compared between TRI and TFI. In order to minimize potential biases, a 1:1 propensity score matching (PSM) was performed. A total of 899 pairs were matched. Results: Baseline and procedural characteristics were well-balanced between TRI and TFI groups after controlling for confounders using PSM. TRI was associated with reduced major post-PCI bleeding (odds ratio [OR], 0.64; 95% confidence interval [CI], 0.54–0.76; p<0.001) and access site complications (OR, 0.67; 95% CI, 0.61–0.74; p<0.001) after PSM. There was no statistical differences in the incidence rates of major adverse cardiac events (a composite of cardiac death, myocardial infarction, and target vessel revascularization) both during hospitalization and at 1-year follow-up (p>0.05). Conclusions: In this propensity score-based analysis of TRI versus TFI in Chinese women, TRI showed advantages of safety and feasibility over TFI. A wider adoption of TRI in women has the potential to improve outcomes in treatment of coronary artery diseases.