Cyclic behavior of moment frames with conventional or slit Infills

2021 ◽  
Vol 178 ◽  
pp. 106494
Author(s):  
Zahra Ahmadi ◽  
Ali Akbar Aghakouchak ◽  
Seyyed Rasoul Mirghaderi
Keyword(s):  
Cyclic Behavior ◽  
Moment Frames

Permissible Parameter Ranges of Access Hole Geometries for WUF-W Connections

2017 ◽  
Vol 33 (2) ◽  
pp. 687-707 ◽  
Author(s):  
Sang Whan Han ◽  
Nam Hun Kim
Keyword(s):  
Seismic Behavior ◽  
Three Dimensional ◽  
Nonlinear Finite Element ◽  
Cyclic Behavior ◽  
Finite Element Analyses ◽  
Moment Frames ◽  
Access Hole ◽  
Special Moment Frames ◽  
Flat Portion ◽  
Parameter Ranges

The welded unreinforced flange-welded web (WUF-W) connection is one of seven prequalified connections for special moment frames (SMF) specified in AISC 358-10 (2010). Previous studies reported that the cyclic behavior of WUF-W connections was strongly affected by weld access hole geometry, and some WUF-W connections did not satisfy the requirements for SMF connections. For investigating in detail the effect of access hole configurations on the cyclic behavior of WUF-W connections, this study conducts three-dimensional nonlinear finite element analyses. This study shows that the seismic behavior of WUF-W connections are strongly affected by two configuration parameters, access hole slope and length of flat portion. To satisfy the requirement for SMF connections, this study proposes a range of the access hole slope and length of flat portion for WUF-W connections considering different span-to-depth ratios, beam depths, and material types.

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 Cyclic Behavior of Bolted Extended End-Plate Moment Connections with Different Sizes of End Plate and Bolt Stiffened by a Rib Plate

2018 ◽  
Vol 4 (1) ◽  
pp. 200 ◽  
Author(s):  
Abbas Haghollahi ◽  
Reza Jannesar
Keyword(s):  
Cyclic Loading ◽  
Numerical Study ◽  
Equivalent Plastic Strain ◽  
Cyclic Behavior ◽  
Moment Frames ◽  
Moment Connections ◽  
Element Analysis ◽  
Inertia Moment ◽  
End Plate ◽  
Extended End Plate

This paper presents a numerical study on the behavior of prequalified Bolted Extended End Plate (BEEP) moment connections when are affected by cyclic loading. Specimens were six four-bolt extended end-plate connections consist of H-shaped columns and I-shaped beams with different geometry as well as different end-plate size and bolt diameter; three of them were stiffened by a triangular rib plate welded to the top and bottom of the beam flanges, and others remained unstiffened. They were modeled in ABAQUS software and their cyclic behavior was evaluated using finite element analysis. Responses of specimens were examined by presenting their equivalent plastic strain, stress distribution, and moment-rotation hysteretic curves. Results revealed that with the increase of beam height and inertia moment in equal story drift rotations, the reduction of connection strength occurred earlier due to the occurrence of local buckling in the beam web and flange after subjecting to cyclic loading. By comparing moment-rotation hysteretic responses of specimens, it was found out that in unstiffened BEEP connections with thinner end-plate, the use of single vertical rib stiffener can slightly improve their cyclic behavior, but in connections with thicker end plate, it showed no considerable effect. It was concluded that the BEEP connections whose dimensions are not based on the tenth code of the Iranian national building regulations, cannot satisfy the criteria of AISC seismic provisions for both special and intermediate steel moment frames, although they experienced no local beam web and flange buckling.

Cyclic Behavior of Replaceable Shear Fuse Connections for Steel Moment Frames

2019 ◽  
Vol 145 (12) ◽  
pp. 04019156 ◽  
Author(s):  
Paul W. Richards ◽  
Shannon S. Oh
Keyword(s):  
Cyclic Behavior ◽  
Moment Frames ◽  
Steel Moment Frames

Performance of Precast Concrete Moment Frames Subjected to Column Removal: Part 1, Experimental Study

PCI Journal ◽  
2017 ◽  
Vol 62 (5) ◽  
Author(s):  
H. S. Lew ◽  
Joseph A. Main ◽  
Yihai Bao ◽  
Fahim Sadek ◽  
Vincent P. Chiarito ◽  
...  
Keyword(s):  
Experimental Study ◽  
Precast Concrete ◽  
Moment Frames ◽  
Column Removal

Cyclic Behavior of Unstiffened Double Split-Tee Beam-to-Column Connection

2008 ◽  
Vol 17 (3) ◽  
pp. 474-475
Author(s):  
Yukihiro HARADA ◽  
Kazumasa EBATO ◽  
Junpei YAGI
Keyword(s):  
Cyclic Behavior

Effects of Fling Step and Forward Directivity on Seismic Response of Buildings

2006 ◽  
Vol 22 (2) ◽  
pp. 367-390 ◽  
Author(s):  
Erol Kalkan ◽  
Sashi K. Kunnath
Keyword(s):  
Seismic Response ◽  
Ground Motions ◽  
High Amplitude ◽  
Moment Frames ◽  
Steel Moment Frames ◽  
Damage Potential ◽  
Near Fault ◽  
Forward Directivity ◽  
Fling Step ◽  
Far Fault

This paper investigates the consequences of well-known characteristics of near-fault ground motions on the seismic response of steel moment frames. Additionally, idealized pulses are utilized in a separate study to gain further insight into the effects of high-amplitude pulses on structural demands. Simple input pulses were also synthesized to simulate artificial fling-step effects in ground motions originally having forward directivity. Findings from the study reveal that median maximum demands and the dispersion in the peak values were higher for near-fault records than far-fault motions. The arrival of the velocity pulse in a near-fault record causes the structure to dissipate considerable input energy in relatively few plastic cycles, whereas cumulative effects from increased cyclic demands are more pronounced in far-fault records. For pulse-type input, the maximum demand is a function of the ratio of the pulse period to the fundamental period of the structure. Records with fling effects were found to excite systems primarily in their fundamental mode while waveforms with forward directivity in the absence of fling caused higher modes to be activated. It is concluded that the acceleration and velocity spectra, when examined collectively, can be utilized to reasonably assess the damage potential of near-fault records.

Cyclic behavior of beams rehabilitated by reinforced concrete layers

2021 ◽  
Author(s):  
Sabahattin Aykaç ◽  
Eray Özbek ◽  
Ali Tugrul Tankut
Keyword(s):  
Reinforced Concrete ◽  
Cyclic Behavior
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