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Buckling Modes of Cold-Formed Thin-Walled Steel Beams Under Different Impact Positions
Chang Wu,Junwei Duan,Renhong Wang,Ziheng Yang 한국강구조학회 2023 International Journal of Steel Structures Vol.23 No.1
This paper aims to study the buckling mode of cold-formed thin-walled channel steel beams under different impact positions. The impact test of the thin-walled channel steel beams was carried out using a drop hammer to obtain the acceleration of the measuring point and the buckling mode of the member. The experimental results and ANSYS/LS-DYNA numerical simulation results are compared and analyzed. The results show that the acceleration curve change trend obtained from the test is similar to numerical simulation. The difference between the acceleration obtained by numerical simulation and the maximum value obtained by test accounts for 5.86% of the simulated value. Therefore, the dynamic response results of cold-formed thin-walled channel steel beams under numerical simulation can be effectively verified by the test. Numerical simulation methods are used to analyze the dynamic response of two groups of members under impact at different positions and the corresponding buckling modes. The results show that the buckling of the members at 1/2, 1/3, and 1/4 of the flange of the impact member is similar to the O-I mode under the same conditions. The buckling mode is half-O mode when the midpoint of the intersection line between flange and web is impacted. The buckling mode is U-shaped when the midpoint of the intersection line between flange and the curling edge is impact.
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International Logistics: Does It Matter in Foreign Trade?
HE, Yugang,CHOI, Baek-Ryul,WU, Renhong,WANG, Yinhui Korea Distribution Science Association 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.2
Economic globalization provides a good channel for the development of foreign trade around the world. Due to this background, this paper sets the Organization for Economic Co-operation and Development (OECD) countries as a sample to explore the importance of international logistics in foreign trade. An annual panel data from 2000 to 2017 will be used to conduct an empirical estimation under the panel unit root test and the fixed effect model. Foreign trade is treated as an explained variable and international logistics is treated as explanatory variables. The findings show that international logistics have a positive spillover effect on export trade and the speed of international logistics development has a regulatory effect on the relationship between both of them, which presents a U-shaped curve. When the speed of international logistics development is slow, an increase of it restrains the positive spillover effect of international logistics on export trade. However, when it rises to a certain extent, this increase releases the positive spillover effect of international logistics on export trade. As can be seen by the evidence that this paper provides, the impact of international logistics on foreign trade is dynamic. Moreover, this paper also puts forward some corresponding measures about the relationship between both of them.
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( Yugang He ),( Baek-ryul Choi ),( Renhong Wu ),( Jingnan Wang ) 이화여자대학교 통일학연구원 2020 Journal of peace and unification Vol.10 No.2
This paper contributes to the present research stream by exploring the effect of China’s OFDI over the period 2003-2019 in the case of Korean peninsula. On account of the auto-regressive distributed lag model and Granger causality approach of vector error correction, an inference is drawn that China’s OFDI significantly contributes to the economic growth in Korean peninsula whenever in the short run and long run. However, this kind of contribution is asymmetric in which the contribution of China’s OFDI to North Korea’s economic growth is greater than that of South Korea. Moreover, the long-run causality results originate the bi-directional causality between China’s OFDI and economic growth in Korean peninsula.
ScienceON
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