Frame and Brace Action Forces on Steel Corner Gusset Plate Connections in Buckling-Restrained Braced Frames

2012 ◽  
Vol 28 (2) ◽  
pp. 531-551 ◽  
Author(s):  
Chung-Che Chou ◽  
Jia-Hau Liu
Keyword(s):  
Axial Strain ◽  
Free Edge ◽  
Braced Frames ◽  
Element Analysis ◽  
Gusset Plate ◽  
Braced Frame ◽  
Test Frame ◽  
Force Components ◽  
Buckling Restrained Braced Frames ◽  
Plate Connections

This work presents test and finite element analysis results for a steel buckling-restrained braced frame (BRBF). The objectives are to evaluate the forces of frame and brace actions on the corner gusset plate and to develop a method that considers both actions in design. The BRBF test frame exhibited excellent performance up to a drift of 2% with a maximum axial strain of 1.7% in the buckling-restrained brace. Without free-edge stiffeners, the corner gusset plate buckled at a significantly lower strength than that predicted by the American Institute of Steel Construction (AISC) specifications ( AISC 2005a ). By idealizing the corner gusset plate as a strut, a strut model can be used to determine the forces resulting from frame action, which are on the same order as the brace forces. Considering the stress distributions and force components from the frame and brace actions, the maximum stresses in the gusset tips are used as an additional design parameter for sizing gusset connections.

Seismic Design of Gusset Plate Connections in Concentrically Braced Frames

2018 ◽  
Vol 763 ◽  
pp. 141-148
Author(s):  
Yao Cui ◽  
Wei Zhang ◽  
Jia Chen Zhang ◽  
Qi Tang
Keyword(s):  
Seismic Design ◽  
Axial Load ◽  
Finite Element Models ◽  
Braced Frames ◽  
Concentrically Braced Frames ◽  
Gusset Plates ◽  
Gusset Plate ◽  
Braced Frame ◽  
Concentrically Braced ◽  
Plate Connections

In concentrically braced frames (CBF), gusset plates as the connected members are subjected to forces not only from brace but also from frame action. When the braced frame is deformed, the beam-column connection will deform, and the deformation of beam-column connection either “open” or “close” as the brace under “compression” or “tension”. Therefore, the design of gusset plate should consider the effect of such frame action, in addition of the brace axial load. Six finite element models were developed using ABAQUS to investigate the force distribution of gusset plate under the two actions. It is noted that force in gusset plate can be divided into two parts and frame action is so small that can be neglected during brace buckling.

Development of a Hybrid Simulation Computational Model for Steel Braced Frames

2018 ◽  
Vol 763 ◽  
pp. 609-618
Author(s):  
Ali Imanpour ◽  
Robert Tremblay ◽  
Martin Leclerc ◽  
Romain Siguier
Keyword(s):  
Computational Model ◽  
Hybrid Simulation ◽  
Structural Testing ◽  
Frame Structure ◽  
Axial Stiffness ◽  
Braced Frames ◽  
Element Analysis ◽  
Braced Frame ◽  
Concentrically Braced Frame ◽  
Dynamic Hybrid

Hybrid simulation is an economical structural testing technique in which the critical part of the structure expected to respond in the inelastic range is tested physically whereas the rest of the structure is modelled numerically using a finite element analysis program. The article describes the development of a computational model for the hybrid simulation of the seismic collapse of a steel two-tiered braced frame structure due to column buckling. The column stability response in multi-tiered braced frames is first presented using a pure numerical model of the braced frame studied. The development of the hybrid simulation computational model is then discussed. Effects of initial out-of-straightness imperfections and axial stiffness, P-Delta analysis approach, and gravity analysis technique on the hybrid simulation results are evaluated using a numerical hybrid simulation model. Finally, the results of a continuous pseudo-dynamic hybrid simulation of the seismic response of the steel multi-tiered concentrically braced frame are presented. The test showed that failure of columns by instability is a possibility and can lead to collapse of multi-tiered braced frames, as was predicted by numerical analysis. Furthermore, suitable modeling methods are proposed for hybrid simulation of steel braced frame structures.

Repair Method and Finite Element Analysis for Corroded Gusset Plate Connections Bonded to CFRP Sheets

2021 ◽  
Vol 147 (1) ◽  
pp. 04020310
Author(s):  
Ngoc Vinh Pham ◽  
Takeshi Miyashita ◽  
Kazuo Ohgaki ◽  
Yuya Hidekuma ◽  
Takuya Harada
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Analysis ◽  
Gusset Plate ◽  
Repair Method ◽  
Cfrp Sheets ◽  
Plate Connections

scholarly journals Damage Concentration Effect of Multistory Buckling-Restrained Braced Frames

2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
Hanqin Wang ◽  
Yulong Feng ◽  
Jing Wu ◽  
Qing Jiang ◽  
Xun Chong
Keyword(s):  
Statistical Correlation ◽  
Concentration Effect ◽  
Braced Frames ◽  
Braced Frame ◽  
Factors Affecting ◽  
Residual Drift ◽  
Moment Resisting ◽  
Distribution Parameters ◽  
Buckling Restrained Braced Frames ◽  
Parametric Analyses

Due to the low postyield stiffness of buckling-restrained braces (BRBs), multistory buckling-restrained braced frames (BRBFs) subjected to earthquakes are prone to lateral deformations and damage concentrations at certain stories, which is deemed a damage concentration effect (DCE). A series of nonlinear pushover analyses and response history analyses are conducted to investigate the key factors affecting the DCE of BRBFs. Two comparisons of the DCE are performed for different types of structures and different beam-to-column connections in the main frame (MF). These comparisons show that BRBFs equipped with BRBs as the main earthquake resistance system have a more serious DCE than the traditional moment-resisting frame or conventional braced frame and that the MF stiffness significantly affects the structural residual displacement and DCE. Then, parametric analyses are performed to investigate the influence of two stiffness distribution parameters (in the horizontal and vertical directions) on the DCE of a 6-story BRBF dual system designed according to the Chinese seismic code. The results show that increasing the MF stiffness and avoiding abrupt changes in the BRB stiffness between stories can effectively mitigate the DCE of BRBFs. Finally, the correlations between various damage performance indices are analyzed. A low statistical correlation between the peak and residual drift responses can be observed in BRBFs. Therefore, it is recommended that the DCE be considered in BRBF design.

scholarly journals FINITE ELEMENT ANALYSIS OF PUNCHING SHEAR-UNBALANCED MOMENT INTERACTIONS AT EDGE COLUMN-FLAT PLATE CONNECTIONS

2021 ◽  
pp. 1-10
Author(s):  
I Ketut Sudarsana ◽  
I Gede Gegiranang Wiryadi ◽  
I Gede Adi Susila
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Flat Plate ◽  
Free Edge ◽  
Shear Capacity ◽  
Punching Shear ◽  
Element Analysis ◽  
Concrete Damage ◽  
Plate Connections ◽  
The Moment

The unbalance moments at the edge connections of flat plate structures induced by lateral forces (i.e. an earthquake) may not always act in parallel directions of the building axes. Most research studied the unbalanced moments in one direction, a few of them in biaxial directions, and none of them in incline directions. This paper presents the results of a nonlinear finite element analysis on punching shear capacity at edge column-slab connections subjected to three directions of the unbalanced moments namely perpendicular, incline 45°, and parallel to the slab free edge in combination with the shear force. A 3-D numerical analysis of ten isolated edge column-plate connections was conducted by applying an appropriate element size, mesh, and calibrated material parameters of the concrete damage plasticity (CDP) model in ABAQUS. the connections were subjected to ten variations of the moment to shear (M/V) ratios. The results show that the punching shear capacity decreases exponentially for the unbalanced moment acting perpendicular and parallel to the slab free edge, and linearly for unbalanced moment incline 45° as the increase in M/V ratio. The M-V interaction at the edge connections depends on the unbalanced moment directions which are slightly different from the ACI 318 code.

Cyclic Performance of Braces with Different Support Connections in Special Concentrically Braced Frames

2018 ◽  
Vol 763 ◽  
pp. 694-701 ◽  
Author(s):  
Pratik Patra ◽  
P.C. Ashwin Kumar ◽  
Dipti Ranjan Sahoo
Keyword(s):  
Cyclic Behavior ◽  
Cyclic Performance ◽  
Braced Frames ◽  
Concentrically Braced Frames ◽  
Gusset Plates ◽  
Gusset Plate ◽  
Concentrically Braced Frame ◽  
Concentrically Braced ◽  
Out Of Plane ◽  
Plate Connections

Gusset plate connections between the steel braces and the supporting frame members play an important role in the performance of special concentrically braced frames (SCBFs) under earthquake loading conditions. Extensive studies have been conducted on SCBFs in which the gusset plate connections are designed to ensure the out-of-plane buckling of steel braces. However, research on the cyclic behavior of gusset plate connections allowing the in-plane buckling of braces is very limited. An experimental investigation has been carried out in this study to investigate the cyclic performance of the in-plane buckling of gusset-brace assemblies. Tests showed that the gusset plate connections detailed for in-plane buckling of braces provided performance at par with those detailed for the out-of-plane deformation arrangement. A numerical comparative study on three types of connection arrangements has also been conducted, namely, a) out-of-plane buckling of braces using gusset plates, b) in-plane buckling of braces using knife plates, and c) direct connection of braces without using any gusset plates. Braces made of hollow steel sections having constant slenderness ratio and width-to-thickness ratio are used in all the numerical models. The main parameters compared are the energy dissipation capacity, displacement ductility, patterns of failure, and the sequence of yielding in the components. Both test and analysis results are used to quantify the performances of gusset plate connections in order to achieve an efficient and reliable concentrically braced frame systems.

Experimental and numerical studies on Seismic Performance of The SCFST Column Eccentrically Braced Frames

2020 ◽  
pp. 136943322095060
Author(s):  
Ya-Peng Wu ◽  
Zhi-Hua Chen ◽  
Ting Zhou ◽  
Xian-Dong Chen ◽  
Xiao-Dun Wang
Keyword(s):  
Finite Element ◽  
Energy Dissipation ◽  
Damage Mechanism ◽  
Steel Tube ◽  
Braced Frames ◽  
Static Properties ◽  
Element Analysis ◽  
Eccentrically Braced Frames ◽  
Braced Frame ◽  
Concentrically Braced Frame

The quasi-static experiments and finite element analysis of three groups of special-shaped concrete-filled steel tube (SCFST) column chevron braced frames (two groups of eccentrically braced frames and one group of concentrically braced frame) were carried out. The differences of quasi-static mechanical properties between the three groups frame were compared. The damage mechanism of the concentrically and eccentrically braced frames was significantly different, and the eccentrically braced frame could significantly improve the energy-dissipation ability and ductility. When the single limb of columns was connected by double-steel-plate, the stiffness of eccentrically braced structure could be improved around 10.4% and showed better energy-dissipation capacity. The finite element simulation was built on the basis of experiments, and parametric analysis was examined. The analysis results showed that section forms of the SCFST column and the thickness of brace have significant impacts on the quasi-static properties of such type of structure.

Sign in / Sign up

Export Citation Format

Share Document