An Analytical Study on the Structural Performance Evaluation of the Multistage Overturing Movable Gate

Choi, Jin Woo; Joo, Hyung Joong; Kim, Jung Min; Lee, Kyu Shick; Yoon, Soon-Jong

doi:10.7781/kjoss.2013.25.6.613

Cited by 6 publications

(5 citation statements)

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“…Representative forms of moveable weir installation technology include rubber weirs, hydraulic flip gates, open/close-type water gates, and hinge-type automatic water gates [1,[8][9][10][11]. A moveable weir is valuable not only for the purpose of using and controlling a river, but also in other areas of water Representative forms of moveable weir installation technology include rubber weirs, hydraulic flip gates, open/close-type water gates, and hinge-type automatic water gates [1,[8][9][10][11]. A moveable weir is valuable not only for the purpose of using and controlling a river, but also in other areas of water resource management [1,3,5,10].…”

Section: Introductionmentioning

confidence: 99%

“…Such conditions include exposure to winter and long-term freezing, repeated freeze-thaw cycles, summer heat and repeated dry-wet cycles, and long-term exposure to high temperatures. With repeated drywet cycles and long-term exposure to high temperatures, there is a high possibility of fracture at the bond interface because of the thermal expansion coefficient differences between the GFRP material Representative forms of moveable weir installation technology include rubber weirs, hydraulic flip gates, open/close-type water gates, and hinge-type automatic water gates [1,[8][9][10][11]. A moveable weir is valuable not only for the purpose of using and controlling a river, but also in other areas of water resource management [1,3,5,10].…”

Section: Introductionmentioning

confidence: 99%

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Mechanical and Fracture Properties of Steel/GFRP Hybrid Panels for an Improved Moveable Weir after Exposure to Accelerated Natural Environmental Conditions

et al. 2019

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This study evaluated the performance of a hybrid panel in an improved moveable weir after exposure to accelerated environmental climate conditions. When exposed to a river environment, corrosion problems on improved moveable weir steel panels can occur. To address this, a hybrid panel with structure layering glass fiber-reinforced polymer (GFRP) panels on both sides of the steel panel was used. The steel was, therefore, not exposed to the outside. However, this hybrid panel is a structure that uses a mixture of two materials with different properties and there is the possibility of performance degradation when the GFRP composite material, i.e., the structure that wraps around the bond interface, and the steel panel are exposed to a river environment. Thus, we evaluated the durability of the hybrid panels by repeated exposure to long-term high temperatures, dry–wet environmental cycling, long-term freezing, and freeze–thaw cycling in an accelerated climate deterioration environment. In the flexural tests, the surface processing of the steel panel was shown to be important, with sand-blasted test specimens showing higher flexural strength. For the control specimens, the flexural strength decreased as the thickness of the GFRP panels increased. However, for the sand-blasted specimens, the flexural strength increased as the thickness of the GFRP panels increased. After exposure to accelerated climate deterioration, the flexural strength tests showed that the residual strength increased with panel thickness and that the residual strengths were greater for specimens incorporating sand-blasted steel panels. The results of our testing show that hybrid panels incorporating sand-blasted steel were adequate for use in improved moveable weirs.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanical and Fracture Properties of Steel/GFRP Hybrid Panels for an Improved Moveable Weir after Exposure to Accelerated Natural Environmental Conditions

et al. 2019

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“…Movable weirs, developed in the 1980s, are used to control the flow characteristics of rivers or obstruct flow to retain the required water levels via variation in their height and/or position. 1 –3 When rivers are controlled by fixed concrete weirs, silt tends to deposit upstream due to the reduced flow velocity; this generates problems such as flooding, water flow capacity degradation, and water pollution. 4 Also fixed concrete weirs lose most of their functionality over time.…”

Section: Introductionmentioning

confidence: 99%

“…However, the strength of rubber weirs is insufficient. 2 –5 Improved movable weirs resolve the shortcomings of rubber weirs and tipping gates, 8 –10 using a combination of airbags and a stainless steel gates 2 –6 (Figure 1); however, steel, used in almost all of the components other than the airbags, tend to corrode in river environments (Figure 2). One of the steel components in question is a clamping plate.…”

Section: Introductionmentioning

confidence: 99%

Fracture and long-term aging characteristics of GFRP clamping plates for improved movable weirs

Oh¹,

Park

2018

Polymers and Polymer Composites

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In this study, the durability of movable weirs was improved by replacing steel clamping plates with glass fiber-reinforced polymer (GFRP) material. Because the clamping plates of movable weirs are always in contact with water, the service life of weirs is reduced due to corrosion. Other environmental conditions also degrade movable weirs, such as exposure to continuous inundation, dry environments, repeated dry and wet conditions, and chemical environments. This study evaluated the absorption, fracture, and long-term aging properties of GFRP clamping plates for improved movable weirs. Absorption increased with immersion time in 60°C tap water, sodium sulfate (Na2SO4) solution, or calcium chloride (CaCl2) solution. However, the total absorption for 50 days and 100 days exposure was low, less than 0.50% and 0.62%, respectively. In fracture load tests, the GFRP clamping plates showed the largest reduction in strength after exposure to the CaCl2 solution; 70% and 67% of the control load were retained for exposures of 50 days and 100 days, respectively. After exposure to both tap water and the Na2SO4 solution, the GFRP clamping plates showed residual strengths of 77% and 69% after 50 days and 100 days exposure, respectively. The GFRP clamping plates showed 74% and 71% residual strength after exposure to repeated freeze–thaw environments for 50 days and 100 days, respectively, and 80% residual strength after exposure to all other environments for 50 days or 100 days. Both vertical and horizontal cracks were generated before fracture after exposure to an environment involving direct contact with moisture. Without moisture, only horizontal cracks were generated before fracture.

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“…Therefore, such weirs have been replaced by movable ones [1,2,5,7]. Movable weirs are required not only for the purposes of using and controlling rivers but also in various fields such as water resource management and water-friendly space composition and for small hydraulic power plants [4][5][6][7][8][9][10][11][12]. Movable weirs installed in rivers are largely classified into three types: a rubber weir using the air supply/discharge method, a hydraulic steel flipping gate, and a mixed air bag and steel plate gate improved movable weir [2,[4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Sulfate and Calcium Chloride Resistance of Steel/Glass Fiber-Reinforced Polymer Hybrid Panel for Improved Movable Weir Application

Lee

Yoo

Park

2017

International Journal of Polymer Science

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This study evaluated the performance of a hybrid panel that can overcome the current problem of corrosion of the steel panels of improved movable weirs when they are exposed to a sulfate and calcium chloride environment such as sea water. A hybrid panel with glass fiber-reinforced polymer (GFRP) layers on both sides of a steel panel means that the central panel is not exposed to the external elements, which can avoid corrosion problems. In this study, to maximize the hybrid panel’s strength and durability, the moisture absorption characteristics and the durability in an accelerated environment were evaluated. The test results were considered to indicate no durability issues as the final absorption ratio was approximately 2.0% or less in all environments. Also, from the accelerated deterioration test results when the steel panel processed by sand blasting was applied in all accelerated deterioration environments, it satisfied the residual strength level of 65% or more. However, in the case without surface processing, upon exposure to MgSO4 solution, it did not satisfy the standard residual strength level of 65%. These results show that sand blasting on the surface of a steel panel is adequate for hybrid panels for improved movable weirs.

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An Analytical Study on the Structural Performance Evaluation of the Multistage Overturing Movable Gate

Cited by 6 publications

References 1 publication

Mechanical and Fracture Properties of Steel/GFRP Hybrid Panels for an Improved Moveable Weir after Exposure to Accelerated Natural Environmental Conditions

Mechanical and Fracture Properties of Steel/GFRP Hybrid Panels for an Improved Moveable Weir after Exposure to Accelerated Natural Environmental Conditions

Fracture and long-term aging characteristics of GFRP clamping plates for improved movable weirs

Sulfate and Calcium Chloride Resistance of Steel/Glass Fiber-Reinforced Polymer Hybrid Panel for Improved Movable Weir Application

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