Shake table assessment of gusset plate connection behaviour in concentrically braced frames

Salawdeh, Suhaib; English, Jack; Goggins, Jamie; Elghazouli, A.Y.; Hunt, Alan; Broderick, Brian

doi:10.1016/j.jcsr.2017.07.022

Cited by 23 publications

(4 citation statements)

References 15 publications

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“…The gusset plate rotation and out of plane buckling phenomenon was also observed in this study (see Figure 3). Similar observations are reported by other researchers (Okazaki et al, 2012;Hsiao et al, 2013;Salawdeh et al, 2017). (Zhang et al, 2011).…”

Section: Mathematical Model For Chevron Effectsupporting

confidence: 92%

“…It is worth noting that the chevron effect model does not consider any stiffening effect of the gusset plate for the beam. This assumption relies on the results of several experimental tests revealing the out-of-plane bending of the gusset plate when the compression brace buckles (Zhang et al, 2011;Lumpkin et al, 2012;Okazaki et al, 2012;Hsiao et al, 2013;Salawdeh et al, 2017). The mentioned mathematical model will be discussed, and its performance will be studied and compared with finite element model results in the following sections.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the Performance of a Mathematical Model to Analyze Concentrically Braced Frame Beams with V-Type Bracing Configurations

Hadad,

Fortney

2020

Eng J

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The chevron effect and the corresponding mathematical model used to predict the beam shear force and bending moment demands on beams in concentrically braced frames with V- or inverted V-type (also known as chevrons) configurations is studied in this paper. The common analysis approach considers beam span, work point location, and a concentrated force representing the unbalanced vertical forces of the braces while ignoring any local effects resulting from the brace connection geometry. The assumptions and load distribution mechanisms in the connection region that have been discussed in earlier literature are presented, and the performance of the mathematical model based on chevron effect (CE method) is examined by comparing its results with the results of a net vertical force method (NVF) in addition to those obtained by finite element analysis. The analysis procedure recently proposed for beams in chevron concentrically braced frames is used to design the beams in a group of 20 beam-gusset assemblies. The results revealed the presence of the chevron effect in chevron beams. It also showed the CE method is able to estimate the beam maximum shear force and bending moment. Additionally, the stress distribution along the gusset-to-beam interface is studied.

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Section: Mathematical Model For Chevron Effectsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Investigation on the Performance of a Mathematical Model to Analyze Concentrically Braced Frame Beams with V-Type Bracing Configurations

Hadad,

Fortney

2020

Eng J

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“…As one of the most efficient earthquake-resistant steel structural systems, the concentrically braced frames (CBFs) are widely used in seismic regions. In the past few decades, many studies [1][2][3][4][5][6][7][8][9], focusing on the seismic performance of CBFs, were conducted. As directly related to the structural damage, the peak inter-storey drift is of main concern in these studies, while less attention has been paid to the post-earthquake condition of CBFs.…”

Section: Introductionmentioning

confidence: 99%

Shake Table Testing of Self‐Centring Concentrically Braced Frames

Goggins¹,

Jiang

Broderick

et al. 2021

ce papers

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The self‐centring system presented in this paper is a novel damage control technique designed to improve the resilience of concentrically braced frames (CBF) under seismic action. Namely, traditional CBFs can undergo large residual drifts following an earthquake event which can limit the opportunity for cost‐effective repair of the structure. Additionally, the gusset plates connecting the brace members to beams and/or columns can experience substantial rotations as a result of the compression buckling of the bracing members. Through the utilisation of post‐tensioning strands placed between flanges of beams, the novel self‐centring concentrically braced frame (SC‐CBF) system can return the frame to its original position after significant inelastic deformations experienced during large earthquakes, resulting in minimum residual drifts. In this paper, shake table testing of the aforementioned SC‐CBF system subjected to realistic earthquake loading is presented. The research is carried out as part of the H2020 “Seismology and earthquake engineering research infrastructure alliance for Europe” SERA project. Four sets of bracing configurations, incorporating varying square hollow section (SHS) braces and gusset plates were utilised in the shake table testing. Uniaxial loading with varying shake table accelerations was executed and the structural response evaluated using data from strain gauges (SG), load cells (LC), displacement transducers and accelerometers. The measured results provide information on the important parameters such as the tensile and compressive strength of the braces, post‐buckling capacity, gusset plate strains and post‐tensioning force. These findings are then presented and the crucial local and global response performance emphasised.

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“…13,14 Brace fracture prior to system failure is considered as the desired controlling failure mode of the braced frames. Details of 3-dimensional full and large-scale testing of braced frame systems [15][16][17] and numerical studies 18 have all concluded that the balanced design criteria can be used to a wide range of geometries, sizes, and types of gusset plate connections as well as demand-tocapacity ratios of brace elements, for obtaining highly inelastic lateral drift capacity.…”

mentioning

confidence: 99%

Numerical and experimental investigations on inelastic cyclic performance of mid‐span gusset plate connections

Kumar

Sahoo

2018

Earthq Engng Struct Dyn

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Summary The design and detailing of gusset plate connections greatly influence the seismic performance of a special concentrically braced frame (SCBF). Recently, a balanced design approach has been proposed in order to develop significant inelastic deformation from multiple yield mechanisms and to delay the failure of connections of SCBF system. Although extensive studies have been conducted on the corner gusset plate connections of SCBFs, research on the detailing of mid‐span beam gusset plates is rather limited. This study aims at investigating the required free length for the detailing of the mid‐span gusset plates with different brace slenderness ratios. A nonlinear finite element analysis has been conducted for a braced frame with 4 different values of linear clearance in the mid‐span gusset plates and 2 values of brace slenderness ratios. In all simulation models, the corner gusset plates have been designed using balanced design approach and detailed using an elliptical clearance of 8 times the gusset plate thickness. An experimental study has also been conducted on 2 gusset plate sub‐assemblages having similar brace slenderness ratio but with 2 different values of linear clearance in the middle gusset plates. The lateral drift capacity corresponding to the brace fracture and the level of damage are found to be dependent on the detailing of the gusset plates. Based on the results of numerical and experimental studies, the required free length has been recommended for the detailing of middle gusset plates of SCBFs of different brace slenderness ratios.

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Shake table assessment of gusset plate connection behaviour in concentrically braced frames

Cited by 23 publications

References 15 publications

Investigation on the Performance of a Mathematical Model to Analyze Concentrically Braced Frame Beams with V-Type Bracing Configurations

Investigation on the Performance of a Mathematical Model to Analyze Concentrically Braced Frame Beams with V-Type Bracing Configurations

Shake Table Testing of Self‐Centring Concentrically Braced Frames

Numerical and experimental investigations on inelastic cyclic performance of mid‐span gusset plate connections

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