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Mechanisms of thermally induced deflection of a long-span cable-stayed bridge
Zhou, Yi,Sun, Limin,Peng, Zhijian Techno-Press 2015 Smart Structures and Systems, An International Jou Vol.15 No.3
Variation of temperature is a primary environmental factor that affects the behavior of structures. Therefore, understanding the mechanisms of normal temperature-induced variations of structural behavior would help in distinguishing them from anomalies. In this study, we used the structural health monitoring data of the Shanghai Yangtze River Bridge, a steel girder cable-stayed bridge, to investigate the mechanisms of thermally induced vertical deflection ($D_T$) at mid-span of such bridges. The $D_T$ results from a multisource combination of thermal expansion effects of the cable temperature ($T_{Cab}$), girder temperature ($T_{Gir}$), girder differential temperature ($T_{Dif}$), and tower temperature ($T_{Tow}$). It could be approximated by multiple linear superpositions under operational conditions. The sensitivities of $D_T$ of the Shanghai Yangtze River Bridge to the above temperatures were in the following order: $T_{Cab}$ > $T_{Gir}$ > $T_{Tow}$ > $T_{Dif}$. However, the direction of the effect of $T_{Cab}$ was observed to be opposite to that of the other three temperatures, and the magnitudes of the effects of $T_{Cab}$ and $T_{Gir}$ were found to be almost one order greater than those of $T_{Dif}$ and $T_{Tow}$. The mechanisms of the thermally induced vertical deflection variation at mid-span of a cable-stayed bridge as well as the analytical methodology adopted in this study could be applicable for other long-span cable-stayed bridges.
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Zhou Yi,Zhao Chao,Zhong Xingu,Wang Langke,Luo Tianye 한국강구조학회 2024 International Journal of Steel Structures Vol.24 No.1
A fi lled thin-walled tube is an excellent energy absorption device, and its performance is closely related to the fi lled core material. In this paper, a porous metal-high performance concrete interpenetrating phase composites (PMCIPC) fi lling core material is proposed, which takes porous nickel as the matrix and high-performance concrete as the reinforcing element, trying to improve the energy absorption of thin-walled tube. Axial quasi-static compression tests were carried out on empty tube, PMCIPC and fi lled tube. Based on the experimental results, the eff ects of wall thickness and aspect ratio on the deformation and energy absorption performance of the fi lled tube were studied by numerical simulation. The results show that the larger wall thickness increases the energy absorption of the empty tube and the fi lled tube. The PMCIPC fi lling further improves the energy absorption capacity, and for the empty tubes with smaller wall thickness, the PMCIPC signifi cantly increases the crushing force effi ciency. When the aspect ratio (L/D) is 3.7, the deformation mode of the fi lled tube is Euler instability, and the performance begins to decrease sharply. Finally, a theoretical model is established to predict the mean crushing force of the fi lled tubes. The model results are in good agreement with the experimental results. This study provides eff ective guidance for the design of thin-walled structures with high energy absorption effi ciency.
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부산 해양 · 수산 관광지에 대한 중국관광객의 기대 및 만족도 연구
이주예 ( Zhouyi Li ),장영수 ( Young-soo Jang ),박정아 ( Jeong-a Park ) 한국수산경영학회 2018 수산경영론집 Vol.49 No.4
Busan is a representative of ocean cities in South Korea, which attracts many Chinese tourists. As a number of Chinese tourists increase, Chinese tourists’ evaluations of sightseeing resources in Busan appear extremely important. However, there are few researches on Chinese tourists’ evaluations of sightseeing in Busan. The purpose of this paper is to analyze Chinese tourists’ evaluations of Busan tourism. Chinese tourists who travel to Busan are chosen as research objects and several aspects including marine, fisheries and general tourism are investigated to evaluate the tourists’ overall satisfaction of the tourism in Busan. IPA analysis, factor analysis multiple regression analysis are used for the research. The results are as follows. Chinese tourists’ evaluations of the importance and performance level of variables on Busan tourism were significantly different (total 19 of 25 variables) and the performance was lower than importance. This means the outputs of the various Busan tourism elements do not live up to their expectations. The findings show that Chinese visitors have high satisfaction on infrastructures of fisheries tourism (e.g. cleanness of aquatic product tourism facilities and sanitary state on fishery products), but low satisfaction in terms of the contents (e.g. unique cooking method experience of seafood and traditional seafood cooking consumption). The factors of fisheries tourism (e.g. product services of fisheries tourism and the attractiveness of seafood in Busan) never affect their satisfaction and intention to revisit and recommend the city.
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Gecko's Ground Reaction Forces on Level/Vertical/Inverted Surfaces
Aihong Ji(지아홍),Zhendong Dai(대젠동),Zhouyi Wang(왕주이),Jintong Wang(왕진통) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Geckos can run even on an inverted surfaces with exceptional speed, strength and agility for their size, representing in many respects an ideal model system for the study of terrestrial locomotion. By measuring the ground reaction force(GRF)s generated by animals when walking upright, climbing vertically or walking on an. inverted surface, we can understand animals adhesion mechanism and locomotion dynamics. We used a sensors array to measure the GRFs. When geckos walked on vertical and inverted surfaces, the lateral force and the fore-aft force play an important role.
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Mei Jin,Zhiming Liu,Wen Zhang,Haixin Dong,Fang Zhou,Jianfeng Yu,Xinpeng Wang,Zhouyi Guo 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.8
Graphene oxide nanosheet (NGO) was covalently functionalized with positively charged, branched polyethylenimine (bPEI) via an amide bond, coated with serum proteins by electrostatic interaction. Operating as a newly fashioned, multifunctional nanocarrier, the processed NGO showed promise for use in combined gene therapy, chemotherapy, photothermal therapy, bioimaging and as a biosensor of cancer cells. Our current research is focused on the systematic studies of mechanisms of cancer cellular uptake, subcellular location, cytotoxicity and the cellular exclusion of the NGO–bPEI nanocarriers. It was observed that NGO–bPEI accumulated in the mitochondria and that long-term retention of NGO–bPEI led to a decrease in mitochondrial membrane potential while levels of reactive oxygen species increased. The mitochondrial effects associated with long-term retention of NGO–bPEI have potential as a synergistic enhancer of the cytotoxic effects of anti-cancer drugs or genes in human lung carcinoma (A549) cells. This work demonstrated the utility of NGO–bPEI-based multifunctional nanocarriers while detailing the mechanism at the cellular level and providing guidance for further research in cancer therapy.
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