scholarly journals Cyclic Behavior of Steel Beam to CFT Column Connections with Gusset Plates

2019 ◽  
Vol 2019 ◽  
pp. 1-16 ◽  
Author(s):  
Peng Wang ◽  
Zhan Wang ◽  
Jianrong Pan ◽  
Yanjun Zheng ◽  
Deming Liu
Keyword(s):  
Failure Modes ◽  
Plastic Hinge ◽  
Hysteretic Behavior ◽  
Cyclic Behavior ◽  
Element Analysis ◽  
Gusset Plates ◽  
Numerical Studies ◽  
Story Drift ◽  
Risk Areas ◽  
Cft Column

Beam-brace-CFT (concrete-filled tubular) column connections provide excellent performance in resisting seismic loads in high-risk areas. However, the load transmission mechanism of this type of connection still remains unclear, and there is a lack of study on it. Therefore, in this paper, the mechanical behavior of beam-brace-CFT column (BBC) connections penetrated by gusset plates was evaluated through experiments and finite element analysis to resolve this issue. The failure modes, strength, stiffness, ductility, and energy dissipation of this type of connection were studied. Experiment results indicated that the gusset plates in BBC (beam-brace-CFT) connections could effectively move the plastic hinge on beam away from the column face, reduce the strain concentration between the beam end and column face, and notably improve the hysteretic behavior; the plastic rotation was able to achieve at least 4% story drift angle before 20% strength degradation. Numerical studies were carried out and validated by experiment results, and then the influence of the weld length and strengthening methods were investigated; some improvement of design suggestions was proposed.

scholarly journals Experimental Study on Hysteretic Behavior of the Overlapped K-Joints with Concrete Filled in Chord

2019 ◽  
Vol 9 (7) ◽  
pp. 1456 ◽  
Author(s):  
Wenwei Yang ◽  
Ruhao Yan ◽  
Yaqi Suo ◽  
Guoqing Zhang ◽  
Bo Huang
Keyword(s):  
Plastic Deformation ◽  
Energy Dissipation ◽  
Cyclic Loading ◽  
Bearing Capacity ◽  
Failure Modes ◽  
The United States ◽  
Hysteretic Behavior ◽  
Tensile Failure ◽  
Element Analysis ◽  
Better Than

Due to the insufficient radial stiffness of the steel tube, the cracking of the weld and the plastic deformation of the string often occur under the cyclic loading of the hollow section pipe joint. In order to avoid such a failure, the overlapped K-joints were strengthened by pouring different concrete into the chords. Furthermore, to explore the detailed effect of filling different concrete in a chord on the hysteretic behavior of the overlapped K-joints, six full-scale specimens were fabricated by two forms, which included the circular chord and braces, the square chord and circular braces, and the low cyclic loading tests, which were carried out. The failure modes, hysteretic curves and skeleton curves of the joints were obtained, and the bearing capacity, ductility and energy dissipation of the joints were evaluated quantitatively. The results showed that plastic failure occurs on the surface of the chord of the joints without filling concrete, while the failure mode of the joints filled with concrete in the chords was the tensile failure of the chords at the weld of the brace toe, and the compressive braces had a certain buckling deformation; The strengthening measures of concrete filled with chord can effectively improve the mechanical properties of the K-joints, the delay of the plastic deformation of the chord, and improve the bearing capacity of the K-joints. Contrarily, the ductility coefficient and the energy dissipation ratio of K-joints decreased with the concrete filled in the chord. The hysteretic behavior of the K-joints with a circular chord and brace was slightly better than that of the K-joints with a square chord and circular brace, and the hysteretic behavior of the K-joints strengthened with fly ash concrete, which was better than that of the K-joints strengthened with ordinary concrete. The results of ANSYS (a large general finite element analysis software developed by ANSYS Company in the United States) analysis agreed well with the experimental results.

Analytical study of the seismic performance of all-steel buckling-restrained braces with H-shaped cores

2020 ◽  
Author(s):  
Ali Mansouri ◽  
Ghasem Moosavi
Keyword(s):  
Seismic Performance ◽  
Analytical Study ◽  
Failure Modes ◽  
Axial Strain ◽  
Cyclic Behavior ◽  
Design Parameters ◽  
Element Analysis ◽  
Buckling Restrained Brace ◽  
Influential Parameters ◽  
Compression Member

The seismic performance of an H-shaped core buckling-restrained brace (HBRB) is evaluated through detailed finite element analysis. The numerical model is validated against available experimental data and a parametric study is carried out to investigate the effect of influential parameters on the cyclic behavior and failure modes of HBRB. Several design parameters including the yielding length ratio, the constrained length, the presence of stiffeners and their thicknesses, the length of the transition region and the gap size are considered in the parametric investigation. Based on the analysis results reducing the yielding length of HBRB increases its post-yield stiffness and the axial strain and stress of the H-section core. Since buckling of the unconstrained region was observed in HBRBs with insufficient stiffener thickness, an analytical method is proposed for evaluating the sufficiency of stiffeners by estimating the critical buckling load of HBRB as a three-segment stepped compression member.

Comparative Analysis on Seismic Performance of Steel Frame with Different Forms of Symmetric Enhanced Nodes

2013 ◽  
Vol 790 ◽  
pp. 247-251
Author(s):  
Li Ting Dong ◽  
Yan Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Comparative Analysis ◽  
Energy Dissipation ◽  
Seismic Performance ◽  
Failure Modes ◽  
Hysteretic Behavior ◽  
Structural Form ◽  
Element Analysis ◽  
Energy Dissipation Capacity

Based on node test and finite element analysis results of four different structural form enhanced nodes,failure modes,hysteretic behavior,bearing capacity,ductility and energy dissipation capacity of nodes are analyzed comprehensively and comparatively for more in-depth exploration about the seismic performance of symmetric enhanced nodes.The results showed that all the symmetric enhanced nodes have full hysteretic curve and energy dissipation capacity. On the whole,The flange-plate reinforced node exhibit better seismic performance.

scholarly journals Seismic behavior of precast reinforced concrete column-to-foundation grouted duct connections

2021 ◽  
Author(s):  
Lorenzo Hofer ◽  
Mariano Angelo Zanini ◽  
Flora Faleschini ◽  
Klajdi Toska ◽  
Carlo Pellegrino
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Precast Concrete ◽  
Plastic Hinge ◽  
Hysteretic Behavior ◽  
Cyclic Behavior ◽  
Experimental Program ◽  
Reinforced Concrete Column ◽  
Cyclic Lateral Load ◽  
Concrete Elements

AbstractThe paper shows the results of an experimental campaign aimed at investigating the cyclic behavior of a column-to-foundation joint for precast concrete elements. The tested connection is realized adopting corrugated steel ducts embedded into the foundation, in which column protruding rebars are anchored by grouting high performance mortar. The experimental program consists in testing six full-scale reinforced concrete square-section columns subject to quasi-static cyclic lateral load with a constant axial compression. A preliminary series of bond tests was carried out to define some experimental variables, i.e., longitudinal rebar diameter and anchorage length. Results of the precast joints are compared with those of two reference cast-in-place specimens with the same geometric characteristics, showing similar hysteretic behavior, energy dissipation and ductility values. Lastly, the plastic hinge height is computed for all the specimens based on experimental concrete strains, and compared to current codes formulations.

scholarly journals Cyclic Behavior of Steel Beam-to-Column Moment Connections Using Different Sizes of Flange Plates and Reinforced by a Single Rib Plate

2018 ◽  
Vol 4 (1) ◽  
pp. 138
Author(s):  
Abbas Haghollahi ◽  
Hassan Ahmadi
Keyword(s):  
Numerical Study ◽  
Plastic Hinge ◽  
Equivalent Plastic Strain ◽  
Cyclic Behavior ◽  
Bottom Flange ◽  
Moment Frames ◽  
Moment Connections ◽  
Element Analysis ◽  
Beam Geometry ◽  
Special Moment Frames

This paper presents a numerical study on the behavior of connection between steel I-beam and H-column when are affected by cyclic loading. The connection used the flange plates to connect the beam flanges to the column flange. They were welded to the top and bottom flange plates and created a welded flange plate (WFP) connection. Specimens were six models of WFP connections with different beam geometry and flange plate sizes which were modeled and their cyclic behavior were investigated using finite element analysis in ABAQUS program. Three of them were reinforced by a vertical triangular top and bottom rib plates, and others remained unreinforced. The results showed that reinforcement with a vertical triangular rib plate attached to the top and bottom flange plates can improve cyclic behavior of WFP connections.  By using a rib plate, the equivalent plastic strain was increased and showed better plastic hinge formation compared to those with no vertical rib plate. Those models with IPB beam sections had the best cyclic behavior compared to those with IPE beam sections and satisfied the acceptance criteria of AISC seismic provisions for intermediate and special moment frames. We concluded that those WFP connections which did not satisfy the criteria of AISC seismic provisions for special moment frames, can be upgraded by a vertical triangular rib plate in order to be used in special moment frames.

scholarly journals Experimental investigation of pultruded GFRP connections

2021 ◽  
Vol 274 ◽  
pp. 03013
Author(s):  
Daler Aripov ◽  
Ivan Kuznetsov ◽  
Marat Salakhutdinov
Keyword(s):  
Literature Analysis ◽  
Considerable Influence ◽  
Element Analysis ◽  
Gusset Plates ◽  
Numerical Studies ◽  
Numerical Predictions ◽  
Present Design ◽  
Strength And Deformation ◽  
Frame Construction ◽  
Steel Bolts

At present, design and construction of all-FRP structures with the use of GFRP are developing. All-FRP frame structures use bolted connections to form nodes between the elements, particularly steel bolts. This research focuses on the use of FRP pultruded plates instead of chords and webs. Frame construction nodes are formed by adjoining frame elements at different angles to the chords through gusset plates. In accordance with the literature analysis, a small number of tests have been carried out to investigate connections at angles to the pultrusion direction the pultrusion direction. Both experimental and numerical studies made with pultruded plates and L-shape FRP profiles have demonstrated that the plates have considerable influence on the strength and deformation of joints so that the joints failure mode involves mainly the bolted plate. These results were then compared against numerical predictions obtained using Ansys for finite-element analysis.

scholarly journals Analysis of the Seismic Performance of Site-Bolted Beam to Column Connections in Modularized Prefabricated Steel Structures

2017 ◽  
Vol 2017 ◽  
pp. 1-18 ◽  
Author(s):  
Xuechun Liu ◽  
Xiaoxiong Cui ◽  
Zhiwei Yang ◽  
Xinxin Zhan
Keyword(s):  
Plastic Deformation ◽  
Failure Mode ◽  
Seismic Performance ◽  
Plastic Hinge ◽  
Ductile Failure ◽  
Steel Structures ◽  
Hysteretic Behavior ◽  
Element Analysis ◽  
Skeleton Curve ◽  
Moderate Earthquake

This paper proposes a site-bolted connection that is suitable for modularized prefabricated steel structures. Excellent ductility is achieved by various structural measures. Six connection specimens with different parameters were subjected to quasi-static loading tests and finite element analysis (FEA) to determine the seismic performance of the proposed connection (e.g., hysteretic behavior, skeleton curve, ductility, and failure mode). The results of the tests and FEA showed that the connection underwent sufficient plastic deformation under cyclic loading and that its ultimate rotation angle could reach 0.09 rad. A clear plastic hinge formed on the beam before the connection failed, which suggests a ductile failure mode. The connection exhibited a wide hysteresis loop, which indicated good seismic performance. The results also showed that the connection does not slip under small earthquakes and could dissipate energy through slippage in the connection region under a moderate earthquake and through slippage in the connection region as well as plastic deformation at the beam end under a severe earthquake. The number of bolts was the main parameter that affected the seismic performance of the connection. The test and FEA results demonstrated that all six specimens had excellent seismic and ductile performance and an exceptional plastic rotation capacity.

scholarly journals Cyclic Behavior and Modeling of Bolted Glulam Joint with Cracks Loaded Parallel to Grain

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Jing Zhang ◽  
Zhi-Fang Liu ◽  
Yong Xu ◽  
Mai-Li Zhang ◽  
Liu-Cheng Mo
Keyword(s):  
Failure Modes ◽  
Damping Ratio ◽  
Three Dimensional ◽  
Material Model ◽  
Elastic Stiffness ◽  
Hysteretic Behavior ◽  
Cyclic Behavior ◽  
Equivalent Viscous Damping ◽  
Energy Dissipated ◽  
Initial Cracks

Under varying humidity and temperature conditions, with the constraint of metal fasteners to wood shrinkage, cracks along the bolt lines are generally observed in bolted glulam joints. A three-dimensional (3D) numerical model was established in software package ANSYS to investigate the cyclic behavior of bolted glulam joints with local cracks. A reversed cyclic loading was applied in the parallel-to-grain direction. The accuracy of numerical simulation was proved by comparison with full-scale experimental results. Typical failure modes were reproduced in the numerical analysis with the application of wood foundation zone material model and cohesive zone material model. The effect of crack number and length on the hysteretic behavior of bolted glulam joints was quantified by a parametric study. It was found that initial cracks impair the peak capacity and elastic stiffness of bolted glulam joints significantly. More decrease in capacity was observed in joints with more cracks, and longer cracks affect elastic stiffness more dramatically. Moreover, with the existence of initial cracks, the energy dissipated and equivalent viscous damping ratio of bolted joints are reduced by 24% and 13.3%, respectively.

Experimental Research on Out-of-Plane Cyclic Behavior of Steel-Plate Composite Walls

2016 ◽  
Vol 10 (01) ◽  
pp. 1650001 ◽  
Author(s):  
Yue Yang ◽  
Jingbo Liu ◽  
Xin Nie ◽  
Jiansheng Fan
Keyword(s):  
Failure Modes ◽  
Shear Failure ◽  
Steel Plate ◽  
Plate Thickness ◽  
Steel Plates ◽  
Hysteretic Behavior ◽  
Cyclic Behavior ◽  
Shear Span ◽  
Out Of Plane ◽  
Composite Walls

Three steel-plate composite walls were tested under reversal loads. The primary purpose of this experiment was to investigate the out-of-plane behavior of steel-plate composite walls under seismic actions, including the failure modes, hysteretic behavior, strength, and stiffness while emphasizing the effects of shear span, connection details, and thickness of the steel plates. All specimens showed some pinching effect in the hysteresis loops. Both shear failure and flexural failure occurred in the tests depending on the shear span and steel plate thickness of the specimens. All surface steel plates of the specimens remained unbuckled before yielding during the loading process, which indicated that the ratio of connector spacing to surface steel plate thickness adopted for the specimens satisfied the requirement of yielding before buckling. The test results also showed that the tie bars contributed significantly to the out-of-plane shear strength of the steel-plate composite walls.

Finite Element Analysis for Unstiffened Overlapped CHS KK-Joints Welded in Different Ways

2010 ◽  
Vol 163-167 ◽  
pp. 299-306 ◽  
Author(s):  
Xiu Li Wang ◽  
Wen Wei Yang ◽  
Lei Zou
Keyword(s):  
Finite Element ◽  
Failure Modes ◽  
Low Frequency ◽  
Steel Structure ◽  
Structure Design ◽  
Hysteretic Behavior ◽  
Ultimate Capacity ◽  
Element Analysis ◽  
Finite Element Software ◽  
Better Than

The question whether hidden weld of unstiffened overlapped CHS (circular hollow sections) KK-joints is welded or un-welded is not clearly mentioned in China's steel structure design codes (GB50017-2003) .This paper mainly analyzes the influence of chord-to-brace diameter ratio β, diameter-to- ply ratio γ and brace-to-chord ply ratio τ to the ultimate bearing capacity of the joints with the hidden weld welded and un-welded. The influence of welded and un-welded hidden welds of the joints on hysteretic behavior under low frequency loading is analyzed , and hysteretic curve of the joints are obtained by the finite element software ANSYS. Side brace or opposite brace of the hidden weld of the joints has little influence on the failure modes and ultimate capacity of the joints. Hysteretic behavior of the joints with the hidden weld un-welded is much better than that of the welded.

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