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Experimental Study on the Motion Process of Radial Retractable Roof Structures
JinYu Lu,Jie Liao,Gan-Ping Shu,Tao Zhang 한국강구조학회 2016 International Journal of Steel Structures Vol.16 No.4
In recent years, the use of retractable roofs is increasing to meet the demand of holding big-scale events. This article introduces a class of radial retractable roofs based on the foldable bar structure (FBS) mechanism. A radial retractable roof structure whose moveable section consisted of 6 segments and 6 rigid linkages was designed with appropriate parameters. An experimental study of a radial retractable roof was carried out. A scale model with a 3 metre diameter was constructed to study the roof deflection and vibration during the deployment process under four different load cases. Furthermore, based on the multi-flexible body dynamics theory, an ADAMS-ANSYS co-simulation was applied to simulate the motion process of the radial retractable roof structure. The experimental results were consistent with the numerical simulations. This indicates that the dynamic and fluctuation phenomena of structural behaviour are universal. The structural vibration was increased with the increase of external loads, and the vibration amplitude increased significantly when the roof was starting and braking. With the closing of the movable roof, the deflection of the fixed roof increased significantly. In the motion process, the bending moment of the fixed roof gradually increases, while that of the moving roof varies little. Vertical vibration is significant in the motion process by reason of the complex wheel-rail contact.
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JinYu Lu,XuDong Qiao,Jie Liao,Yi Tang 한국강구조학회 2016 International Journal of Steel Structures Vol.16 No.4
Numerous experimental and finite element studies have shown that steel plate shear walls with slits have several beneficial characteristics, such as good ductility and excellent energy dissipation capacity, which make them a feasible lateral load resisting and energy dissipation system for high-rise buildings in high seismic regions. The width of the flexural links between slits has a significant effect on the mechanical behavior and hysteretic performance of steel plate shear walls with slits. This paper presented two kinds of steel plate shear walls with non-uniform spacing slits (SPWNS) and investigated their performance under low-cycle loading based on tests and finite element software. The study mainly focused on the ultimate bearing capacity, the lateral stiffness, the energy dissipation capacity and the ductility of SPWNS. The results from numerical analysis and test study were compared with each other. The ultimate bearing capacity and the lateral stiffness of traditional steel plate shear walls with uniform spacing slits (SPWUS) were similar to that of SPWNS. In contrast, the ductility and the energy dissipation capacity of SPWUS were much higher.
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Volunteering and psychological wellbeing in college students in China
Geng Yun,Huang Chien‐Chung,Deng Guosheng,Cheung Shannon P.,Liao Jinyu 한국사회복지학회 2022 Asian Social Work and Policy Review Vol.16 No.2
This study used data from 1871 college students across China to examine the relations among volunteering and PWB in 2020. Results of regression analysis indicate that volunteering had positive effects on the PWB of the students. Students whose motivation to volunteer was public interest had greater PWB, regardless of the degree to which they also reported private gain as a motivation. The significant interaction results indicate that students whose volunteer motivation included both public interest and private gains and who had high frequency of volunteering were more likely to have higher PWB. Policy and practice implications were discussed.
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