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Chacón Flores, Rolando Antonio - One of the best experts on this subject based on the ideXlab platform.
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Influencia de la longitud de carga concentrada sobre el coeficiente de pandeo de vigas esbeltas rigidizadas longitudinalmente
'Universidad de Antioquia', 2019Co-Authors: Loaiza Nelson, Graciano Carlos, Chacón Flores, Rolando AntonioAbstract:Currently, one of the most used steel bridge assembly methods is the Incremental Launching Method (ILM). Its practical application consists in passing the bridge assembly through a launching shoe as well as over each support pile. For steel plate girders, a concentrate vertical reaction also known as patch loading is generated over one the flanges when ILM is employed, and depending on the geometrical and material properties of the girder, buckling failure in the web panel may occur. To overcome this type of failure, plate girders are reinforced with longitudinal Stiffeners. Therefore, this paper aims at investigating the effect of the bearing length on the elastic buckling behavior of longitudinally stiffened girder webs subjected to patch loading. Buckling coefficients of longitudinally stiffened girder webs are calculated by means of linear finite element analysis. Furthermore, a parametric analysis is performed to study the influence of other geometric parameters such as the panel aspect ratio and the geometrical properties of the longitudinal Stiffener on the buckling coefficient. The results show that for longitudinally stiffened girder webs the buckling coefficient increases with the loading length. However, this conclusion is considerably affected by other factors such as the position of the Stiffener, and panel aspect ratios.Peer Reviewe
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Influencia de la longitud de carga concentrada sobre el coeficiente de pandeo de vigas esbeltas rigidizadas longitudinalmente
'Universidad de Antioquia', 2019Co-Authors: Loaiza Nelson, Graciano Carlos, Chacón Flores, Rolando AntonioAbstract:Currently, one of the most used steel bridge assembly methods is the Incremental Launching Method (ILM). Its practical application consists in passing the bridge assembly through a launching shoe as well as over each support pile. For steel plate girders, a concentrate vertical reaction also known as patch loading is generated over one the flanges when ILM is employed, and depending on the geometrical and material properties of the girder, buckling failure in the web panel may occur. To overcome this type of failure, plate girders are reinforced with longitudinal Stiffeners. Therefore, this paper aims at investigating the effect of the bearing length on the elastic buckling behavior of longitudinally stiffened girder webs subjected to patch loading. Buckling coefficients of longitudinally stiffened girder webs are calculated by means of linear finite element analysis. Furthermore, a parametric analysis is performed to study the influence of other geometric parameters such as the panel aspect ratio and the geometrical properties of the longitudinal Stiffener on the buckling coefficient. The results show that for longitudinally stiffened girder webs the buckling coefficient increases with the loading length. However, this conclusion is considerably affected by other factors such as the position of the Stiffener, and panel aspect ratios.Peer ReviewedPostprint (published version
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Influence of bearing length on the patch loading resistance of multiple longitudinally stiffened webs
'Wiley', 2017Co-Authors: Loaiza Nelson, Graciano Carlos, Chacón Flores, Rolando Antonio, Casanova EuroAbstract:Incremental launching is one of the common steel bridge assembly methods used nowadays, its practical application consists in passing the bridge assembly through the launching shoes as well as over each support pile. In some cases, when plate girders are used, it is usual to find longitudinal Stiffeners reinforcement in order to prevent web local buckling produced by the vertical reaction acting in the support pile. A considerable number of studies have focused on evaluating the impact of a single Stiffener on the resistance of plate girder subjected to patch loading. However, the effect of multiple longitudinal stiffened plate girders subjected to lengthy compressive load has received little attention. Therefore, this paper aims at studying the influence of load bearing length on the ultimate strength of multiple longitudinally stiffened webs subjected to compressive loads. Patch loading resistance is numerically calculated using a previously validated nonlinear finite element analysis. Subsequently, a parametrical study is conducted to investigate the effect of the aforementioned load length and the relative position and size of the Stiffeners on the ultimate strengthPeer Reviewe
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Influence of bearing length on the patch loading resistance of multiple longitudinally stiffened webs
'Wiley', 2017Co-Authors: Loaiza Nelson, Graciano Carlos, Chacón Flores, Rolando Antonio, Casanova EuroAbstract:Incremental launching is one of the common steel bridge assembly methods used nowadays, its practical application consists in passing the bridge assembly through the launching shoes as well as over each support pile. In some cases, when plate girders are used, it is usual to find longitudinal Stiffeners reinforcement in order to prevent web local buckling produced by the vertical reaction acting in the support pile. A considerable number of studies have focused on evaluating the impact of a single Stiffener on the resistance of plate girder subjected to patch loading. However, the effect of multiple longitudinal stiffened plate girders subjected to lengthy compressive load has received little attention. Therefore, this paper aims at studying the influence of load bearing length on the ultimate strength of multiple longitudinally stiffened webs subjected to compressive loads. Patch loading resistance is numerically calculated using a previously validated nonlinear finite element analysis. Subsequently, a parametrical study is conducted to investigate the effect of the aforementioned load length and the relative position and size of the Stiffeners on the ultimate strengthPeer ReviewedPostprint (published version
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A comparative analysis of longitudinal Stiffener cross-section for slender I-girders subjected to patch loading
'Wiley', 2017Co-Authors: Chacón Flores, Rolando Antonio, Loaiza Nelson, Graciano Carlos, Casanova EuroAbstract:In the construction of traditional composite bridges whose structure consists of plate girders, the concrete slabs of the decks are often casted before launching. These thin-walled webs are occasionally reinforced with longitudinal Stiffeners to increase bending and shear strengths, and for bridges erected by incremental launching, these Stiffeners also provide an enhancement for patch loading resistance. Experimental works have shown that ultimate resistance to patch loading is highly dependent on the size, relative position and shape of the longitudinal Stiffener. Nonetheless, a comparison between those three factors should be carried out in order to establish the optimum configuration of longitudinal stiffening for webs under compressive forces. Hence, this study attempts to compare the increase of ultimate strength of a slender I-girder subjected to concentrated load using open and closed section types of Stiffeners, evaluating three different Stiffeners configurations: i) a single open section Stiffener, ii) multiple open section Stiffeners, and iii) a single closed section Stiffener. The nonlinear computations were performed using a finite element analysis parametric model, where the relative position and size of the Stiffeners are varied to cover a wide range of geometries.Peer ReviewedPostprint (published version
Loaiza Nelson - One of the best experts on this subject based on the ideXlab platform.
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Influencia de la longitud de carga concentrada sobre el coeficiente de pandeo de vigas esbeltas rigidizadas longitudinalmente
'Universidad de Antioquia', 2019Co-Authors: Loaiza Nelson, Graciano Carlos, Chacón Flores, Rolando AntonioAbstract:Currently, one of the most used steel bridge assembly methods is the Incremental Launching Method (ILM). Its practical application consists in passing the bridge assembly through a launching shoe as well as over each support pile. For steel plate girders, a concentrate vertical reaction also known as patch loading is generated over one the flanges when ILM is employed, and depending on the geometrical and material properties of the girder, buckling failure in the web panel may occur. To overcome this type of failure, plate girders are reinforced with longitudinal Stiffeners. Therefore, this paper aims at investigating the effect of the bearing length on the elastic buckling behavior of longitudinally stiffened girder webs subjected to patch loading. Buckling coefficients of longitudinally stiffened girder webs are calculated by means of linear finite element analysis. Furthermore, a parametric analysis is performed to study the influence of other geometric parameters such as the panel aspect ratio and the geometrical properties of the longitudinal Stiffener on the buckling coefficient. The results show that for longitudinally stiffened girder webs the buckling coefficient increases with the loading length. However, this conclusion is considerably affected by other factors such as the position of the Stiffener, and panel aspect ratios.Peer Reviewe
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Influencia de la longitud de carga concentrada sobre el coeficiente de pandeo de vigas esbeltas rigidizadas longitudinalmente
'Universidad de Antioquia', 2019Co-Authors: Loaiza Nelson, Graciano Carlos, Chacón Flores, Rolando AntonioAbstract:Currently, one of the most used steel bridge assembly methods is the Incremental Launching Method (ILM). Its practical application consists in passing the bridge assembly through a launching shoe as well as over each support pile. For steel plate girders, a concentrate vertical reaction also known as patch loading is generated over one the flanges when ILM is employed, and depending on the geometrical and material properties of the girder, buckling failure in the web panel may occur. To overcome this type of failure, plate girders are reinforced with longitudinal Stiffeners. Therefore, this paper aims at investigating the effect of the bearing length on the elastic buckling behavior of longitudinally stiffened girder webs subjected to patch loading. Buckling coefficients of longitudinally stiffened girder webs are calculated by means of linear finite element analysis. Furthermore, a parametric analysis is performed to study the influence of other geometric parameters such as the panel aspect ratio and the geometrical properties of the longitudinal Stiffener on the buckling coefficient. The results show that for longitudinally stiffened girder webs the buckling coefficient increases with the loading length. However, this conclusion is considerably affected by other factors such as the position of the Stiffener, and panel aspect ratios.Peer ReviewedPostprint (published version
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Influence of bearing length on the patch loading resistance of multiple longitudinally stiffened webs
'Wiley', 2017Co-Authors: Loaiza Nelson, Graciano Carlos, Chacón Flores, Rolando Antonio, Casanova EuroAbstract:Incremental launching is one of the common steel bridge assembly methods used nowadays, its practical application consists in passing the bridge assembly through the launching shoes as well as over each support pile. In some cases, when plate girders are used, it is usual to find longitudinal Stiffeners reinforcement in order to prevent web local buckling produced by the vertical reaction acting in the support pile. A considerable number of studies have focused on evaluating the impact of a single Stiffener on the resistance of plate girder subjected to patch loading. However, the effect of multiple longitudinal stiffened plate girders subjected to lengthy compressive load has received little attention. Therefore, this paper aims at studying the influence of load bearing length on the ultimate strength of multiple longitudinally stiffened webs subjected to compressive loads. Patch loading resistance is numerically calculated using a previously validated nonlinear finite element analysis. Subsequently, a parametrical study is conducted to investigate the effect of the aforementioned load length and the relative position and size of the Stiffeners on the ultimate strengthPeer Reviewe
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Influence of bearing length on the patch loading resistance of multiple longitudinally stiffened webs
'Wiley', 2017Co-Authors: Loaiza Nelson, Graciano Carlos, Chacón Flores, Rolando Antonio, Casanova EuroAbstract:Incremental launching is one of the common steel bridge assembly methods used nowadays, its practical application consists in passing the bridge assembly through the launching shoes as well as over each support pile. In some cases, when plate girders are used, it is usual to find longitudinal Stiffeners reinforcement in order to prevent web local buckling produced by the vertical reaction acting in the support pile. A considerable number of studies have focused on evaluating the impact of a single Stiffener on the resistance of plate girder subjected to patch loading. However, the effect of multiple longitudinal stiffened plate girders subjected to lengthy compressive load has received little attention. Therefore, this paper aims at studying the influence of load bearing length on the ultimate strength of multiple longitudinally stiffened webs subjected to compressive loads. Patch loading resistance is numerically calculated using a previously validated nonlinear finite element analysis. Subsequently, a parametrical study is conducted to investigate the effect of the aforementioned load length and the relative position and size of the Stiffeners on the ultimate strengthPeer ReviewedPostprint (published version
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A comparative analysis of longitudinal Stiffener cross-section for slender I-girders subjected to patch loading
'Wiley', 2017Co-Authors: Chacón Flores, Rolando Antonio, Loaiza Nelson, Graciano Carlos, Casanova EuroAbstract:In the construction of traditional composite bridges whose structure consists of plate girders, the concrete slabs of the decks are often casted before launching. These thin-walled webs are occasionally reinforced with longitudinal Stiffeners to increase bending and shear strengths, and for bridges erected by incremental launching, these Stiffeners also provide an enhancement for patch loading resistance. Experimental works have shown that ultimate resistance to patch loading is highly dependent on the size, relative position and shape of the longitudinal Stiffener. Nonetheless, a comparison between those three factors should be carried out in order to establish the optimum configuration of longitudinal stiffening for webs under compressive forces. Hence, this study attempts to compare the increase of ultimate strength of a slender I-girder subjected to concentrated load using open and closed section types of Stiffeners, evaluating three different Stiffeners configurations: i) a single open section Stiffener, ii) multiple open section Stiffeners, and iii) a single closed section Stiffener. The nonlinear computations were performed using a finite element analysis parametric model, where the relative position and size of the Stiffeners are varied to cover a wide range of geometries.Peer ReviewedPostprint (published version
Jingtao Zhang - One of the best experts on this subject based on the ideXlab platform.
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topographical design of Stiffener layout for plates against blast loading using a modified ant colony optimization algorithm
Structural and Multidisciplinary Optimization, 2019Co-Authors: Tangying Liu, Guangyong Sun, Jianguang Fang, Jingtao ZhangAbstract:The stiffened plates are of demonstrable advantages and potential in offering high resistance to such extreme loading scenarios as blast. Since the distribution of the Stiffeners has considerable effect on their performance, its design signifies an important topic of research. However, existing research has mainly focused on empirical design, and the configurations were largely experience based, which limits structural explosion-proof capacity. In order to improve the performance of stiffened plates against blast loading, we introduced here two new structural configurations of stiffened plates. In this study, the modified ant colony optimization (MACO) algorithm which introduces the mass constraint factor to the pheromone update function and integrates the idea of crossover and mutation was used to design the subjected to given working conditions. Specifically, material distribution of Stiffeners is taken to be the design variables, and minimization of the maximum deflection of the center point of the plate to be the design objective under predetermined mass constraints. Compared with the baseline structure, the optimal designs largely improved the explosion-proof performance through distributing Stiffener topology on the plates. The results showed that the optimum designs all present the reinforcement Stiffeners to link with the fixed boundaries against the deformation. Moreover, the optimum designs placed more reinforcement materials in the central regions instead of four angles, and with the increase of the mass fraction, the reinforcement placement gradually extends from the center to the edges. The proposed method and new topological configurations are expected to provide some insights into design for novel protective structures.
Guangyong Sun - One of the best experts on this subject based on the ideXlab platform.
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topographical design of Stiffener layout for plates against blast loading using a modified ant colony optimization algorithm
Structural and Multidisciplinary Optimization, 2019Co-Authors: Tangying Liu, Guangyong Sun, Jianguang Fang, Jingtao ZhangAbstract:The stiffened plates are of demonstrable advantages and potential in offering high resistance to such extreme loading scenarios as blast. Since the distribution of the Stiffeners has considerable effect on their performance, its design signifies an important topic of research. However, existing research has mainly focused on empirical design, and the configurations were largely experience based, which limits structural explosion-proof capacity. In order to improve the performance of stiffened plates against blast loading, we introduced here two new structural configurations of stiffened plates. In this study, the modified ant colony optimization (MACO) algorithm which introduces the mass constraint factor to the pheromone update function and integrates the idea of crossover and mutation was used to design the subjected to given working conditions. Specifically, material distribution of Stiffeners is taken to be the design variables, and minimization of the maximum deflection of the center point of the plate to be the design objective under predetermined mass constraints. Compared with the baseline structure, the optimal designs largely improved the explosion-proof performance through distributing Stiffener topology on the plates. The results showed that the optimum designs all present the reinforcement Stiffeners to link with the fixed boundaries against the deformation. Moreover, the optimum designs placed more reinforcement materials in the central regions instead of four angles, and with the increase of the mass fraction, the reinforcement placement gradually extends from the center to the edges. The proposed method and new topological configurations are expected to provide some insights into design for novel protective structures.
Shijie Zhou - One of the best experts on this subject based on the ideXlab platform.
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creep age forming aa2219 plates with different Stiffener designs and pre form age conditions experimental and finite element studies
Journal of Materials Processing Technology, 2015Co-Authors: Aaron C L Lam, Zhusheng Shi, Haoliang Yang, Li Wan, Catrin M Davies, Jianguo Lin, Shijie ZhouAbstract:a b s t r a c t Creep-age forming (CAF) is one of the relatively new forming techniques that has been proven viable for the production of extra-large integral airframe structures. However, experimental studies on forming stiffened structures under creep-ageing conditions remain scarce. In this work, 200 mm × 48 mm inte- grally stiffened plates of aluminium alloy 2219 have been formed on an end clamp device that has a bending radius of 156 mm and creep-aged at 175 ◦C for 18 h. Three different Stiffener designs, namely the beam stiffened, waffle and isogrid plates, are tested alongside the flat plates. Utilisation of PTFE pocket fillers and intermediate sheets to reinforce and protect Stiffeners during forming operation is found effec- tive as demonstrated by the defect-free formed parts with smooth curvature. Springback of the plates ranged from 12.2 to 15.7% in the experimental studies for different Stiffener designs. Using the CAF mate- rial constants determined for this alloy, corresponding finite element models have been developed and experimentally validated using the measured profiles of the creep-age formed plates. Up to 6.3% differ- ence in springback is observed when forming workpieces with different pre-form age condition alone. © 2014 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND
