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RISS 인기검색어
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- 저자 : Yanting Ji (검색결과 2 건)
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Study on Crack Resistance and Calculation Model of RAC Beams Strengthened with Prestressed CFRP
Yanting Ji,Sheng Sun,Aijiu Chen,Fen Yang,Shihua Bai,Xiaoyan Han 한국콘크리트학회 2024 International Journal of Concrete Structures and M Vol.18 No.2
With the development of recycled aggregate concrete (RAC), the recovery rate of construction waste is improved, and the pollution problem is alleviated. In particular, RAC beams strengthened with prestressed carbon fiber reinforced plastics (CFRP) can exhibit improved mechanical properties, expanding RAC application. Four groups of reinforced RAC beam specimens contained 0%, 40%, 70%, and 100% recycled coarse aggregate, respectively. Each group of beams was first pre-cracked and then strengthened by prestressed CFRP with one layer and two layers respectively. Finally, the bearing capacity tests were performed for these beams. The test results show that as the recycled coarse aggregate content increases, the cracking moment and ultimate load capacity of the beam decrease, while its crack width increases. As the CFRP layer increases, the deformation and crack width of the beam decreases, while the number of cracks increases. The prestressed CFRP also exhibited tensile and peeling failure. A beam deflection calculation model was established by introducing a coefficient k representing the interaction between recycled aggregate and CFRP. The influence coefficient of concrete elongation on the crack width and average crack spacing of the beam was modified, and the crack width analysis model of the beam was established. The calculated results are in good agreement with the experimental observations. It can provide reference for the application and design of recycled concrete beams strengthened with prestressed CFRP.
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The potential of Panax notoginseng against COVID-19 infection
Yeye Hu,Ziliang He,Wei Zhang,Zhiqiang Niu,Yanting Wang,Ji Zhang,Ting Shen,Hong Cheng,Weicheng Hu 고려인삼학회 2023 Journal of Ginseng Research Vol.47 No.5
The COVID-19 pandemic has changed the world and has presented the scientific community with unprecedentedchallenges. Infection is associated with overproduction of proinflammatory cytokines secondaryto hyperactivation of the innate immune response, inducing a cytokine storm and triggeringmultiorgan failure and significant morbidity/mortality. No specific treatment is yet available. For thousandsof years, Panax notoginseng has been used to treat various infectious diseases. Experimental evidenceof P. notoginseng utility in terms of alleviating the cytokine storm, especially the cascade, andimproving post-COVID-19 symptoms, suggests that P. notoginseng may serve as a valuable adjuncttreatment for COVID-19 infection.
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