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Larry A Fahnestock - One of the best experts on this subject based on the ideXlab platform.

  • full scale cyclic rotation and shear load testing of double web with top and Seat Angle beam column connections
    Journal of Structural Engineering-asce, 2020
    Co-Authors: Thierry Beland, Robert Tremblay, Eric M Hines, Larry A Fahnestock
    Abstract:

    AbstractPartially restrained beam-column connections such as bolted double web with top and Seat Angle connections can be used in the gravity load system of steel buildings to develop secondary mom...

  • cyclic flexural testing of concentrically braced frame beam column connections
    Journal of Structural Engineering-asce, 2011
    Co-Authors: Christopher D Stoakes, Larry A Fahnestock
    Abstract:

    This research investigates the cyclic flexural behavior and performance of concentrically braced frame beam-column connections in the context of evaluating the reserve lateral load-resisting capacity in concentrically braced frames. Eight beam-column connections with gusset plates, employing double Angle and end plate details, were studied using full-scale experiments to determine their flexural strength, stiffness, and ductility. In this paper, the effects of connection parameters, such as end plate thickness, Angle thickness, bolt configuration, weld type and size, and supplementary Seat Angle, are evaluated. The global connection behavior and performance are quantified using normalized moment versus story drift data. In comparison to a baseline double Angle detail, all connection variations increased the strength and stiffness. The end plate variations resulted in larger increases in strength, but drift capacity was limited by bolt fracture. The double Angle variations increased the strength by smaller...

Christopher D Stoakes - One of the best experts on this subject based on the ideXlab platform.

  • cyclic flexural testing of concentrically braced frame beam column connections
    Journal of Structural Engineering-asce, 2011
    Co-Authors: Christopher D Stoakes, Larry Alan Fahnestock
    Abstract:

    This research investigates the cyclic flexural behavior and performance of concentrically braced frame beam-column connections in the context of evaluating the reserve lateral load-resisting capacity in concentrically braced frames. Eight beam-column connections with gusset plates, employing double Angle and end plate details, were studied using full-scale experiments to determine their flexural strength, stiffness, and ductility. In this paper, the effects of connection parameters, such as end plate thickness, Angle thickness, bolt configuration, weld type and size, and supplementary Seat Angle, are evaluated. The global connection behavior and performance are quantified using normalized moment versus story drift data. In comparison to a baseline double Angle detail, all connection variations increased the strength and stiffness. The end plate variations resulted in larger increases in strength, but drift capacity was limited by bolt fracture. The double Angle variations increased the strength by smaller...

  • cyclic flexural testing of concentrically braced frame beam column connections
    Journal of Structural Engineering-asce, 2011
    Co-Authors: Christopher D Stoakes, Larry A Fahnestock
    Abstract:

    This research investigates the cyclic flexural behavior and performance of concentrically braced frame beam-column connections in the context of evaluating the reserve lateral load-resisting capacity in concentrically braced frames. Eight beam-column connections with gusset plates, employing double Angle and end plate details, were studied using full-scale experiments to determine their flexural strength, stiffness, and ductility. In this paper, the effects of connection parameters, such as end plate thickness, Angle thickness, bolt configuration, weld type and size, and supplementary Seat Angle, are evaluated. The global connection behavior and performance are quantified using normalized moment versus story drift data. In comparison to a baseline double Angle detail, all connection variations increased the strength and stiffness. The end plate variations resulted in larger increases in strength, but drift capacity was limited by bolt fracture. The double Angle variations increased the strength by smaller...

Larry Alan Fahnestock - One of the best experts on this subject based on the ideXlab platform.

  • cyclic flexural testing of concentrically braced frame beam column connections
    Journal of Structural Engineering-asce, 2011
    Co-Authors: Christopher D Stoakes, Larry Alan Fahnestock
    Abstract:

    This research investigates the cyclic flexural behavior and performance of concentrically braced frame beam-column connections in the context of evaluating the reserve lateral load-resisting capacity in concentrically braced frames. Eight beam-column connections with gusset plates, employing double Angle and end plate details, were studied using full-scale experiments to determine their flexural strength, stiffness, and ductility. In this paper, the effects of connection parameters, such as end plate thickness, Angle thickness, bolt configuration, weld type and size, and supplementary Seat Angle, are evaluated. The global connection behavior and performance are quantified using normalized moment versus story drift data. In comparison to a baseline double Angle detail, all connection variations increased the strength and stiffness. The end plate variations resulted in larger increases in strength, but drift capacity was limited by bolt fracture. The double Angle variations increased the strength by smaller...

Bo Yang - One of the best experts on this subject based on the ideXlab platform.

  • experimental tests of different types of bolted steel beam column joints under a central column removal scenario
    Engineering Structures, 2013
    Co-Authors: Bo Yang
    Abstract:

    Several structural collapse incidents indicate that failure usually started from beam–column joints when exposed to abnormal loads. If the connections are sufficiently robust and there is adequate axial restraint from adjoining structures, catenary action usually forms and gives rise to alternate load paths when affected columns are severely damaged, resulting in large deformations in adjoining beams and slabs. This paper presents seven experimental tests of the performance of common types of bolted steel beam–column joints under a central-column-removal scenario. The joint types including web cleat, top and Seat Angle, top and Seat with web Angle (TSWA) (8 mm Angle), fin plate, flush end plate, extended end plate and TSWA(12 mm Angle) are studied under the central-column-removal scenario. This study provides the behaviour and failure modes of different connections, including their abilities to deform in catenary mode. The test results indicate that the web cleat connection has the best performance in the development of catenary action, and the flush end plate, fin plate and TSWA connections could also deform in a ductile manner and develop catenary action prior to failure. It is worthy to note that tensile capacities of beam–column joints after undergoing large rotations usually control the failure mode and the formation of catenary action. A new tying resistance expression is proposed to consider the effect of large rotation. If large rotation is not considered in the design stage, the joints with poor rotation capacities would fail to achieve the design tying resistances. The test results also demonstrate that the rotation capacities of beam–column joints based on the experimental results in this study were much higher than the recommended values.

  • robustness of bolted Angle connections against progressive collapse experimental tests of beam column joints and development of component based models
    Journal of Structural Engineering-asce, 2013
    Co-Authors: Bo Yang
    Abstract:

    AbstractSeveral structural collapse incidents indicate that failure usually starts from beam-column joints exposed to abnormal loads, especially for steel and composite structures. If the connections are sufficiently robust and there is adequate axial restraint from adjoining structures, catenary action forms in the beams and slabs, causing alternate load paths when affected columns are severely damaged, and resulting in large deformations in the beams and slabs. This paper presents experimental results of bolted-Angle beam-column joints under a middle column–removal scenario. Three types of connections—including (1) web cleat, (2) top and Seat Angle, and (3) top and Seat with web Angle connections—were investigated, and three Angle thicknesses (8, 10, and 12 mm) were tested. The results of the nine experimental tests conducted demonstrate the ductility and load-carrying capacities of these three connection types with different Angle thicknesses in catenary action mode. When the Angle thickness increases,...

Zhang Hao - One of the best experts on this subject based on the ideXlab platform.

  • Experimental evaluation of the full-range behaviour of steel beam-to-column connections
    2020
    Co-Authors: Yan Shen, Rasmussen Kim, Jiang Luli, Zhu Chen, Zhang Hao
    Abstract:

    The paper summarises recent experimental research undertaken at the University of Sydney on determining the full-range behaviour of steel beam-to-column connections. Three series of tests were conducted on three different types of connections including bolted extended end-plate connections, top-and-Seat Angle connections and double web Angle connections. The tests were continued well into the post-ultimate range until complete failure of the connection, obtaining the connection’s full-range behaviour comprising the initial linear response, non-linear behaviour resulting from gradual yielding of connection components, ultimate state, and post-ultimate softening and fracture behaviour. The failure modes were observed and analysed for the tested connection types. Moreover, for the top-and-Seat Angle connections and double web Angle connections, multiple tests were conducted on nominally identical connections to examine the variability of the connection behaviour, which stems from the random variation in geometric and material properties.The Australian Research Counci

  • Full-range behaviour of top-and-Seat Angle connections
    2020
    Co-Authors: Yan Shen, Rasmussen Kim, Jiang Luli, Zhang Hao
    Abstract:

    This paper presents recent research carried out at the University of Sydney on the full-range behaviour of top-and-Seat Angle connections. A total of 18 tests were conducted, covering two connection configurations and three loading conditions, including bending, combined bending and compression, and combined bending and tension. The highlights of the experimental programme include: a) all connections were tested to their complete failure, thereby investigating the full-range behaviour of the connections, including initial stiffness, ultimate bending strength, ductility and failure mode, as well as the detailed behaviour of the top flange cleat component; and b) multiple tests were carried out on nominally identical connections to examine the variability of joint behaviour, providing valuable information for estimating the uncertainties in joint properties due to the random variation in geometrical and material properties, including imperfections introduced during fabrication. Based on the experimental results, conclusions were drawn on the applicability and accuracy of the Eurocode 3 Part 1-8 provisions for calculating the initial stiffness and ultimate strength of top-and-Seat Angle connections. Results showed that the Eurocode 3 model significantly underestimates the connection strength by over 80%, due to the conservative strength prediction of the top flange cleat component. To overcome this limitation, a new mechanical model was developed for the top flange cleat component to more accurately predict its full-range behaviour, from initial linearity to complete failure. The model reflects the real deformation pattern of a flange cleat by capturing the development of four plastic hinges in the cleat, while remaining simple and applicable to hand calculation. The model was applied to the tested connections, showing a conservative and reasonably accurate strength prediction with substantial improvement from the current Eurocode 3 model.The Australian Research Counci

  • Experimental investigation of full-range action-deformation behaviour of top-and-Seat Angle and web Angle connections
    'Hong Kong Institute of Steel Construction', 2018
    Co-Authors: Jiang Luli, Rasmussen Kim, Zhang Hao
    Abstract:

    Web Angle connections are usually categorized as a type of pinned connection whose moment resisting capacity is assumed negligible. Hence, there is a lack of experimental data in regard to the moment-rotation behavior of this type of connection. Experimental databases for top-and-Seat Angle connections are more readily available in the literature. However, experimental tests of nominally identical connections are very limited. Also, most experimental studies on steel connections focus on the elastic behavior up to the yield point. This paper presents 36 experimental tests on the full-range action-deformation behavior of top-and-Seat Angle connections (18 tests) and web Angle connections (18 tests). The joints were subjected to three loading conditions, i.e. bending only, combined bending and compression, and combined bending and tension. To investigate the full-range joint behavior, tests were conducted well into the post-ultimate range to complete failure including fracture. Nominally identical tests were conducted to investigate the uncertainties in joint properties, providing statistical models for joint properties and behavior. The full-range action-deformation test results for each group of tests are reported in this paper. A digital image correlation (DIC) system was used to monitor the deformation of critical components. Images captured during experiments were processed using Dantec software to generate the time-based deformation indices, which can be used to calibrate/validate finite element (FE) models. By comparing the experimental ultimate moment capacity and the design moment capacity based on Eurocode 3, it was found that the moment resisting capacities of top-and-Seat Angle connections are underestimated in Eurocode 3. The test results also indicate that the moment capacity of web Angle connection is non-negligible.The Australian Research Counci

  • Full-range behaviour of semi-rigid steel connections
    'Hong Kong Institute of Steel Construction', 2018
    Co-Authors: Zhu Chen, Yan Shen, Rasmussen Kim, Jiang Luli, Zhang Hao
    Abstract:

    The paper summarises recent research programs undertaken at the University of Sydney on determining the full-range behaviour of steel connections including post-peak softening and fracture. The overall context of this work is to produce models based on the Component Method for the moment-rotation behaviour of joints that are sufficiently simple and accurate that they can be implemented in beam-element based finite element models of steel frames, so as to be able to predict the strength of steel frames by Geometric and Material Nonlinear Analysis with Imperfections (GMNIA), or "advanced" analysis, accounting for the nonlinear behaviour and strength of connections. The paper first summarises three series of tests conducted on bolted moment end-plate connections, top-and-Seat Angle connections and web Angle connections. The tests were continued well into the post-ultimate range to capture the softening and fracture behaviour. Secondly, the paper summarises the Generalised Component Method which includes elastic, inelastic and softening springs to describe the full-range behaviour of each component and the complete joint model. Having set out the equilibrium and compatibility equations, the Method is applied to the connections used for the experimental investigation, demonstrating reasonable agreement. Conclusions are drawn about the suitability of the Generalised Component Method for predicting the full-range behaviour of bolted moment end plate connections. The suitability of the Method for use in designing steel frames by advanced analysis is also discussed.The Australian Research Counci