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RISS 인기검색어
- 검색키워드
- 저자 : Hualin Fan (검색결과 5 건)
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- 유료
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Lateral Compression Behaviors of Thin-walled Equilateral Triangular Tubes
Hualin Fan,Wu Hong,Fangfang Sun,Ying Xu,Fengnian Jin 한국강구조학회 2015 International Journal of Steel Structures Vol.15 No.4
The paper deals with one important topic in impact engineering - the lateral compression behavior of thin-walled tubes. To study the lateral collapse modes and energy absorption behaviors of equilateral triangular tubes, quasi-static compression experiments were carried out. Crushing modes were revealed by the experiments. Three typical crushing stages characterize the lateral deformation plateaus of equilateral triangular tubes. In simulation, perfect tubes have symmetrical crushing modes. Strengths of the tubes were correctly predicted by the competition between yielding and buckling. Based on the observed crushing modes, plastic models were proposed for each stage to predict the lateral crushing behaviors theoretically. Equilateral triangular tubes have unified energy absorbing mechanisms, including five plastic hinges and one traveling plastic hinge. Plastic models have been constructed to predict the mean crushing forces and evaluate the energy absorption efficiency of the equilateral triangular tubes.
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Association between hearing loss and physical performance in patients on maintenance hemodialysis
Fan Weifeng,Zhong Xiaojing,Wu Qing,Zhang Lihong,Yang Zhenhao,Gu Yong,Guo Qi,Chen Xiaoyu,Yu Chen,Zhang Kun,Ding Wei,Qi Hualin,Zhao Junli,Zhang Liming,Zhang Suhua,Niu Jianying 대한신장학회 2024 Kidney Research and Clinical Practice Vol.43 No.3
Background: The correlation between hearing loss (HL) and physical performance in patients receiving maintenance hemodialysis (MHD) remains poorly investigated. This study explored the association between HL and physical performance in patients on MHD. Methods: This multicenter cross-sectional study was conducted between July 2020 and April 2021 in seven hemodialysis centers in Shanghai and Suzhou, China. The hearing assessment was performed using pure-tone average (PTA). Physical performance was assessed using the Timed Up and Go Test (TUGT), handgrip strength, and gait speed. Results: Finally, 838 adult patients (male, 516 [61.6%]; 61.2 ± 2.6 years) were enrolled. Among them, 423 (50.5%) had mild to profound HL (male, 48.6% and female, 53.4%). Patients with HL had poorer physical performance than patients without HL (p < 0.001). TUGT was positively correlated with PTA (r = 0.265, p < 0.001), while handgrip strength and gait speed were negatively correlated with PTA (r = –0.356, p < 0.001 and r = –0.342, p < 0.001, respectively). Physical performance in patients aged <60 years showed significant dose-response relationships with HL. After adjusting for confounders, the odds ratios (95% confidence intervals) for HL across the TUGT quartiles (lowest to highest) were 1.00 (reference), 1.15 (0.73–1.81), 1.69 (1.07–2.70), and 2.87 (1.69–4.88) (p for trend = 0.005). Conclusion: Lower prevalence of HL was associated with a faster TUGT and a stronger handgrip strength in patients on MHD.
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Crushing Behavior of Hierarchical Hexagonal Thin-Walled Steel Tubes Under Oblique Impact
Weiwei Li,Hualin Fan 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.1
In this paper, oblique crushing behaviors of the hierarchical hexagonal steel tubes were investigated. In the oblique impact, the crushing mode transfers from axial crushing dominated mode to bending dominated mode with the increase of the impact angle. In normal impact, the hierarchical steel tubes have progressive folding and global folding, depending on the cell number and the thickness of the sandwich wall. There are two hybrid crushing modes at oblique impact, progressivefolding- bending (hybrid mode II) and global-folding-bending (hybrid mode III). Before the hybrid crushing mode appears, the peak force is reduced but the energy absorbing performance changes little compared with the normal impact. When the impact angle is 10°, the hierarchical steel tube still has excellent energy absorption. It is also found that when the cell number in the sandwich wall changes from 4 to 6, the crushing mode at the impact angle of 10° transfers from progressive folding, hybrid folding II to hybrid folding III, while the crushing mode at normal impact transforms from progressive folding, hybrid folding I to global folding. It is found that adopting hierarchical topology can greatly improve the energy absorption at oblique impact, even better than that of the normally impacted single-cell tubes.
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Frusta Structure Designing to Improve Quasi-static Axial Crushing Performances of Triangular Tubes
Wu Hong,Changliang Lai,Hualin Fan 한국강구조학회 2016 International Journal of Steel Structures Vol.16 No.1
To improve quasi-static axial crushing performances of thin-wallled triangular tubes, frusta structures were designed and fabricated. Quasi-static axial compression experiments were carried out to reveal the collapse mode and energy absorption characteristic of the triangular frusta tube. Peak loads and mean crushing forces (MCFs) of tubes with different taper angles were compared. In-extensible and extensible collapse modes were suggested to predict the MCF of the triangular frusta tube with small and great taper angles, respectively. A new collapse mode, inward folding, was observed in the experiments. An energy absorption stability factor was defined to evaluate the anti-crushing efficiency of the triangular frusta tube. With greater taper angles, the energy absorption stability factor is much closer to 1, denoting more stable deformation style. It is concluded that frusta structures with taper angles effectively enhance the anti-crushing efficiency and stability of thin-walled triangular tubes.
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Load carrying capacity of CFRP retrofitted broken concrete arch
Peng Wang,Meirong Jiang,Hailong Chen,Fengnian Jin,Jiannan Zhou,Qing Zheng,Hualin Fan 국제구조공학회 2017 Steel and Composite Structures, An International J Vol.23 No.2
To reuse a broken plain concrete (PC) arch, a retrofitting method was proposed to ensure excellent structural performances, in which carbon fiber reinforced polymers (CFRPs) were applied to repair and strengthen the damaged PC arch through bonding and wrapping techniques. Experiments were carried out to reveal the deformation and the load carrying capacity of the retrofitted composite arch. Based on the experiments, repairing and strengthening effects of the CFRP retrofitted broken arch were revealed. Simplified analysing model was suggested to predict the peak load of the CFRP retrofitted broken arch. According to the research, it is confirmed that absolutely broken PC arch can be completely repaired and reinforced, and even behaves more excellent than the intact PC arch when bonded together and strengthened with CFRP sheets. Using CFRP bonding/wrapping technique a novel efficient composite PC arch structure can be constructed, the comparison between rebar reinforced concrete (RC) arch and composite PC arch reveals that CFRP reinforcements can replace the function of steel bars in concrete arch.
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