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Loading capacity evaluation of composite box girder with corrugated webs and steel tube slab
He, Jun,Liu, Yuqing,Xu, Xiaoqing,Li, Laibin Techno-Press 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.50 No.4
This paper presents a type of composite box girder with corrugated webs and concrete filled steel tube slab to overcome cracking on the web and reduce self-weight. Utilizing corrugated steel web improves the efficiency of prestressing introduced into the top and bottom slabs due to the accordion effect. In order to understand the loading capacity of such new composite structure, experimental and numerical analyses were conducted. A full-scale model was loaded monotonically to investigate the deflection, strain distribution, loading capacity and stiffness during the whole process. The experimental results show that test specimen has enough loading capacity and ductility. Based on experimental works, a finite element (FE) model was established. The load-displacement curves and stress distribution predicted by FE model agree well with that obtained from experiments, which demonstrates the accuracy of proposed FE model. Moreover, simplified theoretical analysis was conducted depending on the assumptions which were confirmed by the experimental and numerical results. The simplified analysis results are identical with the tested and numerical results, which indicate that simplified analytical model can be used to predict the loading capacity of such composite girder accurately. All the findings of present study may provide reference for the application of such structure in bridge construction.
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Loading capacity evaluation of composite box girder with corrugated webs and steel tube slab
Jun He,Yuqing Liu,Xiaoqing Xu,Laibin Li 국제구조공학회 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.50 No.4
This paper presents a type of composite box girder with corrugated webs and concrete filled steel tube slab to overcome cracking on the web and reduce self-weight. Utilizing corrugated steel web improves the efficiency of prestressing introduced into the top and bottom slabs due to the accordion effect. In order to understand the loading capacity of such new composite structure, experimental and numerical analyses were conducted. A full-scale model was loaded monotonically to investigate the deflection, straindistribution, loading capacity and stiffness during the whole process. The experimental results show that test specimen has enough loading capacity and ductility. Based on experimental works, a finite element (FE) model was established. The load-displacement curves and stress distribution predicted by FE model agreewell with that obtained from experiments, which demonstrates the accuracy of proposed FE model. Moreover, simplified theoretical analysis was conducted depending on the assumptions which were confirmed by the experimental and numerical results. The simplified analysis results are identical with the tested and numerical results, which indicate that simplified analytical model can be used to predict the loading capacity of such composite girder accurately. All the findings of present study may provide reference for the application of such structure in bridge construction.
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Inertia matching analysis of a 5-DOF hybrid optical machining manipulator
Yixuan Kong,Gang Cheng,Feng Guo,Wei Gu,Laibin Zhang 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.10
Inertia matching means the ratio of the mechanical load inertia is converted to each actuator shaft to motor inertia, which is guaranteed within a reasonable range. At present, inertia matching is widely applied to tandem manipulators and CNC machine tools. However, the researches on the inertia matching of large load inertia optical machining manipulators have not been paid sufficient attention. We took the 5-DOF hybrid optical machining manipulator as the research object, established inverse dynamics model based on virtual work principle, and expressed the algebraic relationship between the joint-reflected inertia (JRI) coefficient and the ratio of load inertia. We also determined the inertia matching range of the machining manipulator by analyzing the mechanical system’s resonance frequency, energy matching efficiency and other factors qualitatively and quantitatively, as well as combining the load inertia ratio with dynamic precision characteristics. Finally, according to the derivation results, we analyzed the inertia matching rules of the 5-DOF hybrid optical machining manipulator with different structural parameters in certain machining tasks. In addition, the JRI coefficient and inertia matching principle proposed in this paper can be widely applied to other machining manipulators’ selection of driving equipment under different machining targets, and can also be used to evaluate the selection results.
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