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Robert Tremblay - One of the best experts on this subject based on the ideXlab platform.

  • detailed component modelling of a self centering energy dissipative brace system
    4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, 2014
    Co-Authors: Jeffrey Erochko, Constantin Christopoulos, Robert Tremblay
    Abstract:

    The self-centering energy-dissipative (SCED) brace is a new steel Bracing Member that provides damping to a structure and a re-centering capability, reducing or eliminating residual building deformations after major seismic events. Recently, the SCED concept has been extended through the design and construction of a new enhanced-elongation telescoping SCED (or T-SCED) brace that allows for self-centering behaviour over a range that is two times as large as the range that could be achieved by the original SCED Bracing system. Pre- vious prototype tests of SCED and T-SCED braces have shown that the simplified estimates of the initial brace stiffness that were previously used do not predict the results from the proto- type tests well. To accurately model the mechanics of these new systems, a new software tool has been developed that is able to represent the detailed behaviour of SCED braces to deter- mine realistic brace stiffness and the effect of construction tolerances on the brace behaviour. In this paper, the inner workings of the software tool are described and its analysis results are compared to the test results from the two previous experimental studies to demonstrate the software's ability to model SCED and T-SCED behaviour accurately.

  • self centering energy dissipative Bracing system for the seismic resistance of structures development and validation
    Journal of Structural Engineering-asce, 2008
    Co-Authors: Constantin Christopoulos, Robert Tremblay, Martin Lacerte
    Abstract:

    Buildings designed according to modern seismic codes are expected to develop a controlled ductile inelastic response during major earthquakes, implying extensive structural damage after a design level earthquake, along with possibly substantial residual deformations. To address this drawback of traditional yielding systems, a new Bracing system that can undergo large axial deformations without structural damage while providing stable energy dissipation capacity and a restoring force has recently been developed. The proposed Bracing Member exhibits a repeatable flag-shaped hysteretic response with full recentering capabilities, therefore eliminating residual deformations. The mechanics of this new system are first explained, the equations governing its design and response are outlined, and one embodiment of the system, which combines a friction dissipative mechanism and Aramid tensioning elements, is further studied. Results from component tests, full-scale (reduced length) quasi-static axial tests, and quasi-static and dynamic seismic tests on a full-scale frame system are presented. Experimental results confirm the expected self-centering behavior of the self-centering energy dissipative (SCED) Bracing system within the target design drift. Results also confirm the validity of the design and behavior equations that were developed. It is concluded that the proposed SCED concept can represent a viable alternative to current braced frame systems because of its attractive self-centering property and because the simplicity of the system allows it to be scaled to any desired strength level.

  • seismic testing and performance of buckling restrained Bracing systems
    Canadian Journal of Civil Engineering, 2006
    Co-Authors: Robert Tremblay, P Bolduc, R Neville, Ronald H Devall
    Abstract:

    This paper describes a subassemblage seismic test program performed on six buckling-restrained braces (BRBs). Two different brace core segment lengths and two different buckling-restraining mechanisms were examined. The applied loading histories included a qualifying quasi-static cyclic test with stepwise incremental displacement amplitudes and a dynamically applied seismic loading. A test was also carried out on a conventional Bracing Member for comparison purposes. The concrete-filled tube specimens exhibited satisfactory performance under the quasi-static loading protocol, regardless of the length of the core segment. Strain hardening and frictional responses resulted in brace axial forces significantly exceeding the core yield capacity. The steel BRB system exhibited good performance under the quasi-static and dynamic loading sequences, provided that the clearance between the brace core and the buckling-restrained mechanism was kept to a minimum. The dynamic loading protocol was less severe for low-cy...

Masahiro Kurata - One of the best experts on this subject based on the ideXlab platform.

Martin Lacerte - One of the best experts on this subject based on the ideXlab platform.

  • self centering energy dissipative Bracing system for the seismic resistance of structures development and validation
    Journal of Structural Engineering-asce, 2008
    Co-Authors: Constantin Christopoulos, Robert Tremblay, Martin Lacerte
    Abstract:

    Buildings designed according to modern seismic codes are expected to develop a controlled ductile inelastic response during major earthquakes, implying extensive structural damage after a design level earthquake, along with possibly substantial residual deformations. To address this drawback of traditional yielding systems, a new Bracing system that can undergo large axial deformations without structural damage while providing stable energy dissipation capacity and a restoring force has recently been developed. The proposed Bracing Member exhibits a repeatable flag-shaped hysteretic response with full recentering capabilities, therefore eliminating residual deformations. The mechanics of this new system are first explained, the equations governing its design and response are outlined, and one embodiment of the system, which combines a friction dissipative mechanism and Aramid tensioning elements, is further studied. Results from component tests, full-scale (reduced length) quasi-static axial tests, and quasi-static and dynamic seismic tests on a full-scale frame system are presented. Experimental results confirm the expected self-centering behavior of the self-centering energy dissipative (SCED) Bracing system within the target design drift. Results also confirm the validity of the design and behavior equations that were developed. It is concluded that the proposed SCED concept can represent a viable alternative to current braced frame systems because of its attractive self-centering property and because the simplicity of the system allows it to be scaled to any desired strength level.

Constantin Christopoulos - One of the best experts on this subject based on the ideXlab platform.

  • detailed component modelling of a self centering energy dissipative brace system
    4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, 2014
    Co-Authors: Jeffrey Erochko, Constantin Christopoulos, Robert Tremblay
    Abstract:

    The self-centering energy-dissipative (SCED) brace is a new steel Bracing Member that provides damping to a structure and a re-centering capability, reducing or eliminating residual building deformations after major seismic events. Recently, the SCED concept has been extended through the design and construction of a new enhanced-elongation telescoping SCED (or T-SCED) brace that allows for self-centering behaviour over a range that is two times as large as the range that could be achieved by the original SCED Bracing system. Pre- vious prototype tests of SCED and T-SCED braces have shown that the simplified estimates of the initial brace stiffness that were previously used do not predict the results from the proto- type tests well. To accurately model the mechanics of these new systems, a new software tool has been developed that is able to represent the detailed behaviour of SCED braces to deter- mine realistic brace stiffness and the effect of construction tolerances on the brace behaviour. In this paper, the inner workings of the software tool are described and its analysis results are compared to the test results from the two previous experimental studies to demonstrate the software's ability to model SCED and T-SCED behaviour accurately.

  • cast structural yielding fuse
    2008
    Co-Authors: Constantin Christopoulos, Jeffrey Alan Packer, Michael Gray
    Abstract:

    A yielding fuse device is provided for use in association with a brace Member in a Bracing assembly for a structural frame. The device includes arms or elements that yield flexurally when a Bracing Member moves in an axial direction, with the Bracing assembly under either tension or compression loading conditions. The device of the present invention is particularly useful as a mass customized cast device. The device is well suited for seismic Bracing applications.

  • self centering energy dissipative Bracing system for the seismic resistance of structures development and validation
    Journal of Structural Engineering-asce, 2008
    Co-Authors: Constantin Christopoulos, Robert Tremblay, Martin Lacerte
    Abstract:

    Buildings designed according to modern seismic codes are expected to develop a controlled ductile inelastic response during major earthquakes, implying extensive structural damage after a design level earthquake, along with possibly substantial residual deformations. To address this drawback of traditional yielding systems, a new Bracing system that can undergo large axial deformations without structural damage while providing stable energy dissipation capacity and a restoring force has recently been developed. The proposed Bracing Member exhibits a repeatable flag-shaped hysteretic response with full recentering capabilities, therefore eliminating residual deformations. The mechanics of this new system are first explained, the equations governing its design and response are outlined, and one embodiment of the system, which combines a friction dissipative mechanism and Aramid tensioning elements, is further studied. Results from component tests, full-scale (reduced length) quasi-static axial tests, and quasi-static and dynamic seismic tests on a full-scale frame system are presented. Experimental results confirm the expected self-centering behavior of the self-centering energy dissipative (SCED) Bracing system within the target design drift. Results also confirm the validity of the design and behavior equations that were developed. It is concluded that the proposed SCED concept can represent a viable alternative to current braced frame systems because of its attractive self-centering property and because the simplicity of the system allows it to be scaled to any desired strength level.

Konstantinos A Skalomenos - One of the best experts on this subject based on the ideXlab platform.