The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform

Chung-che Chou - One of the best experts on this subject based on the ideXlab platform.

  • Internal flange stiffened Moment Connections with low-damage capability under seismic loading
    Journal of Constructional Steel Research, 2013
    Co-Authors: Chung-che Chou, Gin-show Liou
    Abstract:

    Abstract This study presents the seismic performance of steel Moment Connections using internal flange stiffeners (IFSs) welded at the face of the wide-flange column and inner side of the beam flange. The objective is to develop a steel Moment Connection that can achieve good seismic performance with low-damage capability during a large earthquake loading and minimize the repair cost. Four large-scale Moment Connections were tested to validate the cyclic performance. One Connection which represented a welded-unreinforced flange-bolted web Connection failed before finishing cyclic tests at a drift of 4%. Three IFS Moment Connections showed excellent performance and low damage after experiencing the AISC seismic load twice up to the target drift of 4%, without strength reduction. The specimens were also modeled using the computer program ABAQUS to further verify the effectiveness of the IFS in transferring beam Moment to the column and to investigate potential sources of Connection failure.

  • Seismic rehabilitation performance of steel side plate Moment Connections
    Earthquake Engineering & Structural Dynamics, 2009
    Co-Authors: Chung-che Chou, Keh-chyuan Tsai, Yuang-yu Wang, Chih-kai Jao
    Abstract:

    Moment Connections in an existing steel building located in Kaohsiung, Taiwan were rehabilitated to satisfy seismic requirements based on the 2005 AISC seismic provisions. Construction of the building was ceased in 1996 due to financial difficulties and was recommenced in 2007 with enhanced Connection performance. Steel Moment Connections in the existing building were constructed by groove welding the beam flanges and bolting the beam web to the column. Four Moment Connections, two from the existing steel building, were cyclically tested. A non-rehabilitated Moment Connection with bolted web-welded flanges was tested as a benchmark. Three Moment Connections rehabilitated by welding full-depth side plates between the column face and beam flange inner side were tested to validate the rehabilitation performance. Test results revealed that (1) the non-rehabilitated existing Moment Connection made by in situ welding process prior to 1996 had similar deformation capacity as contemporary Connection specimens made by laboratory welding process, (2) all rehabilitated Moment Connections exhibited excellent performance, exceeding a 4% drift without fractures of beam flange groove-welded joints, and (3) presence of the full-depth side plates effectively reduced beam flange tensile strain near the column face by almost half compared with the non-rehabilitated Moment Connection. The Connection specimens were also modeled using the non-linear finite element computer program ABAQUS to further confirm the effectiveness of the side plate in transferring beam Moments to the column and to investigate potential sources of Connection failure. A design procedure was made based on experimental and analytical studies.

  • Performance evaluation of steel reduced flange plate Moment Connections
    Earthquake Engineering & Structural Dynamics, 2007
    Co-Authors: Chung-che Chou
    Abstract:

    This study details a new Moment Connection that overcomes difficulties in achieving field-weld quality and eliminates steel beam buckling encountered in steel Moment Connections. This study presents cyclic test and finite element analysis results of full-scale subassemblies using steel reduced flange plates (RFPs) to connect steel beam flanges and the column without any other direct Connection. Since the RFP Connection is designed as strong column-strong beam-weak RFPs, the RFP functions as a structural fuse that eliminates weld fractures and beam buckling. Test and analytical results show that (1) the Connections transferred the entire beam flexural strength to the column and reached an interstorey drift of 4% with minor strength degradation, (2) failure of the Connections was owing to buckling or fracturing of the RFP and not of the beam, and (3) the RFP Connection subassembly, modelled using the nonlinear finite element computer program ABAQUS, exhibited hysteretic behaviour similar to that of the flange plate (FP) Moment Connection subassembly. The inelastic buckling force of the RFP was also evaluated by nonlinear regression analyses performed on a nonlinear model that relates buckling force to RFP geometries. Copyright © 2007 John Wiley & Sons, Ltd.

  • Cyclic performance of a type of steel beam to steel-encased reinforced concrete column Moment Connection
    Journal of Constructional Steel Research, 2002
    Co-Authors: Chung-che Chou, Chia-ming Uang
    Abstract:

    Abstract Two full-scale subassemblies with steel-encased reinforced concrete (SRC) columns and steel beams were tested to evaluate the seismic performance of the Connection details. For ease of construction, continuity plates were eliminated and less transverse reinforcement than that specified in the NEHRP seismic provisions was used in the Connection region. The reduced beam section was introduced to reduce the shear demand on the Connection. In addition, two doubler plates were placed away from the column web to enhance the Connection shear resistance. This study showed that: (1) the stringent requirement for the transverse reinforcement could be relaxed; (2) the offset doubler plates were able to resist a significant amount of Connection shear; and (3) the inner concrete strut could be mobilized in the two-sided Moment Connection, but not in the one-sided Moment Connection.

Chia-ming Uang - One of the best experts on this subject based on the ideXlab platform.

Maryam Tabbakhha - One of the best experts on this subject based on the ideXlab platform.

  • numerical study of slotted web reduced flange Moment Connection
    Journal of Constructional Steel Research, 2012
    Co-Authors: Shervin Maleki, Maryam Tabbakhha
    Abstract:

    Abstract Reduced Beam Section (RBS) and Slotted Beam Web (SBW) are two types of seismic resistant Moment Connections that were introduced after the 1994 Northridge earthquake. These Connections have been tested under cyclic loading and have had acceptable performance. In this paper, a new hybrid Connection is introduced that is composed of RBS and SBW and is named Slotted-Web–Reduced-Flange (SWRF). Nonlinear finite element analyses are performed on SWRF under cyclic loading. It is shown that the new Connection in some cases performs better than its RBS and SBW predecessors. The effects of panel zone strength, continuity plates and slot length are also investigated.

  • Numerical study of Slotted-Web–Reduced-Flange Moment Connection
    Journal of Constructional Steel Research, 2012
    Co-Authors: Shervin Maleki, Maryam Tabbakhha
    Abstract:

    Abstract Reduced Beam Section (RBS) and Slotted Beam Web (SBW) are two types of seismic resistant Moment Connections that were introduced after the 1994 Northridge earthquake. These Connections have been tested under cyclic loading and have had acceptable performance. In this paper, a new hybrid Connection is introduced that is composed of RBS and SBW and is named Slotted-Web–Reduced-Flange (SWRF). Nonlinear finite element analyses are performed on SWRF under cyclic loading. It is shown that the new Connection in some cases performs better than its RBS and SBW predecessors. The effects of panel zone strength, continuity plates and slot length are also investigated.

Chih-kai Jao - One of the best experts on this subject based on the ideXlab platform.

  • Seismic rehabilitation performance of steel side plate Moment Connections
    Earthquake Engineering & Structural Dynamics, 2009
    Co-Authors: Chung-che Chou, Keh-chyuan Tsai, Yuang-yu Wang, Chih-kai Jao
    Abstract:

    Moment Connections in an existing steel building located in Kaohsiung, Taiwan were rehabilitated to satisfy seismic requirements based on the 2005 AISC seismic provisions. Construction of the building was ceased in 1996 due to financial difficulties and was recommenced in 2007 with enhanced Connection performance. Steel Moment Connections in the existing building were constructed by groove welding the beam flanges and bolting the beam web to the column. Four Moment Connections, two from the existing steel building, were cyclically tested. A non-rehabilitated Moment Connection with bolted web-welded flanges was tested as a benchmark. Three Moment Connections rehabilitated by welding full-depth side plates between the column face and beam flange inner side were tested to validate the rehabilitation performance. Test results revealed that (1) the non-rehabilitated existing Moment Connection made by in situ welding process prior to 1996 had similar deformation capacity as contemporary Connection specimens made by laboratory welding process, (2) all rehabilitated Moment Connections exhibited excellent performance, exceeding a 4% drift without fractures of beam flange groove-welded joints, and (3) presence of the full-depth side plates effectively reduced beam flange tensile strain near the column face by almost half compared with the non-rehabilitated Moment Connection. The Connection specimens were also modeled using the non-linear finite element computer program ABAQUS to further confirm the effectiveness of the side plate in transferring beam Moments to the column and to investigate potential sources of Connection failure. A design procedure was made based on experimental and analytical studies.

Shervin Maleki - One of the best experts on this subject based on the ideXlab platform.

  • numerical study of slotted web reduced flange Moment Connection
    Journal of Constructional Steel Research, 2012
    Co-Authors: Shervin Maleki, Maryam Tabbakhha
    Abstract:

    Abstract Reduced Beam Section (RBS) and Slotted Beam Web (SBW) are two types of seismic resistant Moment Connections that were introduced after the 1994 Northridge earthquake. These Connections have been tested under cyclic loading and have had acceptable performance. In this paper, a new hybrid Connection is introduced that is composed of RBS and SBW and is named Slotted-Web–Reduced-Flange (SWRF). Nonlinear finite element analyses are performed on SWRF under cyclic loading. It is shown that the new Connection in some cases performs better than its RBS and SBW predecessors. The effects of panel zone strength, continuity plates and slot length are also investigated.

  • Numerical study of Slotted-Web–Reduced-Flange Moment Connection
    Journal of Constructional Steel Research, 2012
    Co-Authors: Shervin Maleki, Maryam Tabbakhha
    Abstract:

    Abstract Reduced Beam Section (RBS) and Slotted Beam Web (SBW) are two types of seismic resistant Moment Connections that were introduced after the 1994 Northridge earthquake. These Connections have been tested under cyclic loading and have had acceptable performance. In this paper, a new hybrid Connection is introduced that is composed of RBS and SBW and is named Slotted-Web–Reduced-Flange (SWRF). Nonlinear finite element analyses are performed on SWRF under cyclic loading. It is shown that the new Connection in some cases performs better than its RBS and SBW predecessors. The effects of panel zone strength, continuity plates and slot length are also investigated.