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Failure Mode of Orthotropic Two-way Composite Slab under Concentrated Load
Yulin Zhan,Wenfeng Huang,Yu Qiao,Zhouyuan Xu,Renda Zhao 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.12
Ordinary reinforced concrete two-way slabs generally suffer from punching failure under concentrated loads, which is a brittle failure and unfavorable to the structures. The composite slabs with steel sheets and PBL (perfobond rib) shear connectors have been applied for reducing the damage to bridge decks from vehicles. Although it is widely used on bridges, the failure mode of the orthotropic two-way composite slabs has rarely been studied when subject to concentrated loads. Accordingly, static loading tests with concentrated forward central load was carried out on 4 two-way composite slabs, in which the effects of the thickness of steel bottom sheets and concrete plates and spacing of PBL shear connectors on mechanical properties were investigated. The test results show that about 12% of the ultimate bearing capacity decreases when the perfobond ribs are spaced farther apart from 180 mm to 240 mm or the thickness of steel bottom sheets is reduced from 10 mm to 8 mm. And the bearing capacity drops by 38.2% when the thickness of concrete plates decreases by 30 mm. The steel-concrete composite slabs exhibit clear bidirectional force characteristics during the loading process, with the main forced direction being along the perfobond ribs, which is related to the stiffness ratio of the two directions. The two-way composite slabs have high bearing capacity and ductility, with obvious signs before failure. The specimens continue to bear the load after local punching failure of concrete near the loading point, which shows the features of both bending and punching failure. Based on the test results, a bending punching failure mode is proposed, which provides a new approach for the calculation of ultimate bearing capacity. An analytical calculation method for ultimate bearing capacity of orthotropic two-way composite slabs based on the failure mode above is derived with yield line theory and plastic theory, which is in excellent agreement with the tested results.
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THE PROBLEM SEVING ENERGY ABOUT INDUCTION MOTOR BY VECTOR CONTROL
Jiaju WU,Niubao WANG,Chenggong ZHAN,Yian ZHANG,Wenfeng ZENG 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
In this article we disscuss energy saving problems, about Induction motor by vector control system based on siip -angular frequency control type. We should consider comprehensive factors such as load current,velocity and so on in order to optimum energy saving effects.
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EFFECT OF METHANOL ADDITION ON COMBUSTION AND EMISSIONS CHARACTERISTICS ON A TURBOCHARGED GDI ENGINE
Hong Chen,Jiakun Du,Yuhuai Li,Wenfeng Zhan,Jian Wu,Fangxi Xie,Guangquan Wu 한국자동차공학회 2022 International journal of automotive technology Vol.23 No.5
To enrich the knowledge and understanding of the application effect of methanol fuel in the current engine, the influence of methanol-gasoline blended fuel containing 10 %, 20 % and 30 % methanol addition (M10, M20 and M30) on the engine performance, combustion and emissions were studied on a turbocharged and direct injection engine with original control system and control parameters. The results showed that at the conditions with low speed, the peak heat release rate and cylinder pressure were decreased by the use of blended fuel while it shown an increased peak combustion pressure and heat release rate at high speed. Meanwhile, the combustion center of blended fuel was obviously different from gasoline and its optimal value, and the combustion variation was increased at low load. The fuel consumption lifted continuously with the increase of methanol addition ratio, and the equivalent fuel consumption of M10 and M20 also was higher than that of pure gasoline. For NOx emissions, although it has been improved continuously for M10, M20 and M30 under the higher engine load, the higher emissions were obtained for M10 and M20 at lower load. In addition, compared with gasoline fuel, the whole particle distribution curve and number concentration was significantly deteriorated with methanol addition.
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Interfacial behavior of segmental concrete-filled Basalt FRP tube under cyclic loading
Yuehan Sun,Kailai Deng,Yulin Zhan,Wenfeng Huang,Chao Yin 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.40 No.1
A segmental concrete-filled basalt fiber-reinforced polymer (BFRP) tube was proposed, whose lightweight characteristic promoted convenient bridge column transportation and construction. A special connecting component between the adjacent BFRP segments ensured effective transfer of sectional forces. Four specimens, including three segmental specimens and one comparative integral concrete-filled BFRP tube, were tested to investigate the mechanical performance of the BFRP tube under cyclic loading. Damage patterns, load-deformation response, and strain development were observed, showing that the segmental concrete-filled BFRP tube presented satisfactory load-carrying and deformation capacities. Further, the connecting component effectively guaranteed a satisfactory hysteretic performance. Based on the test results, the overall load-carrying capacity was mainly determined by the moment resistance of the interface. Furthermore, the segmental structure weakened the confining effect on the core concrete, though applying multiple stirrups could compensate for the reduced confining effect. Finally, design methods were proposed for the connecting component.
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Lai Kaichang,Chen Hong,Du Jiakun,Zhan Wenfeng,Li Yuhuai,Xie Fangxi 한국자동차공학회 2023 International journal of automotive technology Vol.24 No.4
The effects of air and exhaust gas recirculation (EGR) dilution of a spark ignition engine fueled with methanol under different loads were studied by experiment in this paper. Such as ignition delay, combustion center (CA50), IMEP, break thermal efficiency (BTE) and other parameters were investigated to assess the combustion performance. And discussed in depth the balance between NOx emissions and economic performance represented by brake specific fuel consumption (BSFC). The results showed that combustion progress such as ignition delay, combustion duration and CA50 were more sensitive on the changes of EGR, introducing EGR under the same dilution rate prolonged combustion process. Air-EGR dilution showed the best improvement of IMEP and break thermal efficiency, except the optimal area, increasing EGR rate will decreased IMEP and BTE. Air-EGR dilution strategy showed the best improvement on BSFC than air dilution than EGR dilution. Under light load and high load, when the lowest BSFC was obtained, NOx emissions were less than 0.5 g/kWh with air-EGR dilution strategy.
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