| 1. |
- Heistermann, Christine, et al.
(författare)
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Influence of execution tolerances for friction connections in circular and polygonal towers for wind converters
- 2017
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Ingår i: Advanced steel construction. - : Hong Kong Institute of Steel Construction. - 1816-112X. ; 13:4, s. 343-360
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Tidskriftsartikel (refereegranskat)abstract
- Friction connections with long open slotted holes have been proven to be a competitive alternative to the conventional flange connections in steel tubular towers for wind energy converters. As full-scale tests are not available, results of Finite Element Analysis (FEA) of the real-scale tower geometry are used in this paper to investigate the influence of tower cross section shape, execution tolerance (gap between the shells) and length of the connection on the bending resistance. Buckling behaviour of the shell in the vicinity of the friction connection in circular and polygonal towers is compared. The friction connection is thoroughly examined and recommendations for execution tolerances are given. The influence of two types of the execution tolerances on the connection strength is considered: inward bended "fingers", leading to inclined gaps, and a parallel gap created by different tower diameters.
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| 2. |
- Iqbal, Naveed, et al.
(författare)
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Axial Force And Deformation Of A Restrained Steel Beam In Fire : Description and validation of a simplified analytical procedure
- 2016
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Ingår i: Advanced steel construction. - 1816-112X. ; 12:2, s. 174-193
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Tidskriftsartikel (refereegranskat)abstract
- Structural fire design is exceedingly adopting the performance based approach. There are evidentadvantages of this approach compared to the prescriptive methods from codes. An analytical procedure, based on thereal performance, must accurately predict the beam behaviour in fire. The study presented here proposes one suchsimplified analytical procedure aim to predict the real behaviour of a restrained steel beam. The proposed analyticalprocedure is validated through FE Analysis using FE models validated through test results. The study also attempts toestablish the importance of using semi-rigid connection strength with respect to accurately predicting the behaviorof the restrained beam at catenary stage.
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| 3. |
- Iqbal, Naveed, et al.
(författare)
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Axial force and deformation of a restrained steel beam in fire: Description and validation of a simplified analytical procedure
- 2016
-
Ingår i: Advanced steel construction. - : Hong Kong Institute of Steel Construction. - 1816-112X. ; 12:2, s. 174-193
-
Tidskriftsartikel (refereegranskat)abstract
- Structural fire design is exceedingly adopting the performance based approach. There are evident advantages of this approach compared to the prescriptive methods from codes. An analytical procedure, based on the real performance, must accurately predict the beam behaviour in fire. The study presented here proposes one such simplified analytical procedure aim to predict the real behaviour of a restrained steel beam. The proposed analytical procedure is validated through FE Analysis using FE models validated through test results. The study also attempts to establish the importance of using semi-rigid connection strength with respect to accurately predicting the behaviour of the restrained beam at catenary stage.
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| 4. |
- Lopes, Fernanda, et al.
(författare)
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Sub-frames with reverse channel connections to cft composite columns –experimental evaluation
- 2015
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Ingår i: Advanced steel construction. - : Hong Kong Institute of Steel Construction. - 1816-112X. ; 11:1, s. 111-126
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents the experimental results of the investigation on the coupled joint-structure behaviour of the composite sub-frame, using the reverse channel connections between an I-beam and the concrete filled tube (CFT) columns. This experimental programme includes seven full-scale tests: three tests at ambient temperature and four tests under heating-cooling curves. The parametric study was dedicated to: temperature-time curve and channel wall thickness (8, 10 and 12 mm). The main objective of these tests is to provide experimental information on the behaviour of the reverse channel joints and its influence on the structure under a heating-cooling fire. The restraining effects from the unaffected part of surrounding structure induce highly variable loading histories on the joints during fire; therefore the investigation on coupled joint-structure behaviour should lead to a realistic prediction of progressive collapse of the structure.
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| 5. |
- Spremic, Milan, et al.
(författare)
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Push-out experiments of headed shear studs in group arrangements
- 2013
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Ingår i: Advanced steel construction. - 1816-112X. ; 9:2, s. 139-160
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Tidskriftsartikel (refereegranskat)abstract
- Precast concrete slabs connected to the steel beams by headed shear studs arranged in groups may be used in high-rise office buildings to speed up construction process and improve quality by increasing the grade of industrialization. The paper presents experimental research performed on push-out tests at the Faculty of Civil Engineering University in Belgrade. The main goal has been to investigate possible reductions of shear stiffness and strength of five group arrangements consisting always of four headed shear studs, the shank diameter 16 mm and 100 mm height. A shape of group arrangement and its orientation to the applied load, and distance between the studs were variables considered. Intention was to have as small as possible holes in precast concrete slabs so the distance between studs was lower than minimum required in Eurocode 4. Comparison is made with results obtained on specimen with uniformly distributed shear studs, according to requirements of the standard arrangement. Material characteristics were obtained and push-out tests were preformed in procedures that fully comply with Eurocode 4.
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| 6. |
- Tran, Anh Tuan, et al.
(författare)
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Influence of cold-formed angle on high strength steel material properties
- 2019
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Ingår i: Advanced steel construction. - : The Hong Kong Institute of Steel Construction. - 1816-112X. ; 15:4, s. 316-322
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Tidskriftsartikel (refereegranskat)abstract
- This paper describes a study of the S650 high strength steel material properties including the effect of cold-formed angle. Coupon specimens with different cold-formed angles (90°, 100°, 120°, 140°, 160° and 180°) and different thicknesses (4 mm and 6 mm) were examined. Relationships between cold-formed angle and yield stress as well as tensile stress of the material were determined, based on the tensile coupon test results. Yield and tensile stresses assessed by considering the influence of the cold-formed angles were compared with those without considering this influence. Analyses revealed that both yield and tensile stresses decreased with increasing cold-formed angle. Ductile-damage material models available in the finite element analysis software ABAQUS were used to simulate tensile coupon tests. The experimental and numerical results showed good agreements.
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| 7. |
- Tran, Anh Tuan, et al.
(författare)
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Resistance of cold-formed high strength steel angles
- 2019
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Ingår i: Advanced steel construction. - : The Hong Kong Institute of Steel Construction. - 1816-112X. ; 15:3, s. 242-251
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Tidskriftsartikel (refereegranskat)abstract
- This paper describes a study of the behaviour of cold-formed high strength steel angles. Thirty-six specimens with different cold-formed angles (90°, 100°, 120°, 140°, 160°, and 170°) and different thicknesses (4 mm and 6 mm) were considered. The initial geometric imperfections of the specimens were determined using the 3D laser scanning method. The magnitudes of these geometric imperfections for torsional and torsional-flexural buckling and flexural buckling analyses were proposed. The commercial finite element analysis (FEA) programme ABAQUS with shell elements S4R was used for finite element analyses. Different material strengths in corner and flat parts along with different proof stresses (0.2%, 0.01%, and 0.006%) were considered in the numerical models. The experimental and FEA results showed good agreement. Influence of cold-formed angle on non-dimensional slenderness and reduction factor curves of the 4 mm thick columns with 90° and 120° cold-formed angles was analysed.
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