A cast modular bracing system for steel special concentrically braced frames

K. M. Ward; R. B. Fleischman; G. Federico

doi:10.1016/j.engstruct.2012.05.025

A cast modular bracing system for steel special concentrically braced frames

K. M. Ward, R. B. Fleischman, G. Federico

Civil and Architectural Engineering and Mechanics

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

A Cast Modular Ductile Bracing System (CMDB) is under development as an alternative to special concentrically braced frames. The CMDB system introduces cast components at the ends and center of the brace in an attempt to produce a system with reliable strength, stiffness, and deformation capacity. A cruciform cross-section has been chosen for the cast component geometry, which is specially detailed to enhance energy dissipation and increase low cycle fatigue life thereby reducing the likelihood of fracture. In this paper, capacity design parameters are established that describe the axial strength and flexural strength of the cast components relative to the main hollow structural section member. These parameters are varied in 2D finite element models to understand the nature of the system and identify the best performing designs. 3D FE models of the CMDB system and a typical special concentrically braced frame, in combination with fracture indices, are used to compare the expected low cycle fatigue life of the two systems.

Original language	English (US)
Pages (from-to)	104-116
Number of pages	13
Journal	Engineering Structures
Volume	45
DOIs	https://doi.org/10.1016/j.engstruct.2012.05.025
State	Published - Dec 2012

Keywords

Cast steel
Concentrically braced frames
Finite element analysis
Seismic design

ASJC Scopus subject areas

Civil and Structural Engineering

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10.1016/j.engstruct.2012.05.025

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title = "A cast modular bracing system for steel special concentrically braced frames",

abstract = "A Cast Modular Ductile Bracing System (CMDB) is under development as an alternative to special concentrically braced frames. The CMDB system introduces cast components at the ends and center of the brace in an attempt to produce a system with reliable strength, stiffness, and deformation capacity. A cruciform cross-section has been chosen for the cast component geometry, which is specially detailed to enhance energy dissipation and increase low cycle fatigue life thereby reducing the likelihood of fracture. In this paper, capacity design parameters are established that describe the axial strength and flexural strength of the cast components relative to the main hollow structural section member. These parameters are varied in 2D finite element models to understand the nature of the system and identify the best performing designs. 3D FE models of the CMDB system and a typical special concentrically braced frame, in combination with fracture indices, are used to compare the expected low cycle fatigue life of the two systems.",

keywords = "Cast steel, Concentrically braced frames, Finite element analysis, Seismic design",

author = "Ward, {K. M.} and Fleischman, {R. B.} and G. Federico",

note = "Funding Information: This research was supported by NSF Grant No. CMS-0324664. Supplemental support was provided by the American Institute of Steel Construction (AISC) and the Steel Founder{\textquoteright}s Society of America (SFSA). The writers are grateful for this support. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the writers and do not necessarily reflect the views of the National Science Foundation. ",

year = "2012",

month = dec,

doi = "10.1016/j.engstruct.2012.05.025",

language = "English (US)",

volume = "45",

pages = "104--116",

journal = "Engineering Structures",

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AU - Ward, K. M.

AU - Fleischman, R. B.

AU - Federico, G.

N1 - Funding Information: This research was supported by NSF Grant No. CMS-0324664. Supplemental support was provided by the American Institute of Steel Construction (AISC) and the Steel Founder’s Society of America (SFSA). The writers are grateful for this support. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the writers and do not necessarily reflect the views of the National Science Foundation.

PY - 2012/12

Y1 - 2012/12

N2 - A Cast Modular Ductile Bracing System (CMDB) is under development as an alternative to special concentrically braced frames. The CMDB system introduces cast components at the ends and center of the brace in an attempt to produce a system with reliable strength, stiffness, and deformation capacity. A cruciform cross-section has been chosen for the cast component geometry, which is specially detailed to enhance energy dissipation and increase low cycle fatigue life thereby reducing the likelihood of fracture. In this paper, capacity design parameters are established that describe the axial strength and flexural strength of the cast components relative to the main hollow structural section member. These parameters are varied in 2D finite element models to understand the nature of the system and identify the best performing designs. 3D FE models of the CMDB system and a typical special concentrically braced frame, in combination with fracture indices, are used to compare the expected low cycle fatigue life of the two systems.

AB - A Cast Modular Ductile Bracing System (CMDB) is under development as an alternative to special concentrically braced frames. The CMDB system introduces cast components at the ends and center of the brace in an attempt to produce a system with reliable strength, stiffness, and deformation capacity. A cruciform cross-section has been chosen for the cast component geometry, which is specially detailed to enhance energy dissipation and increase low cycle fatigue life thereby reducing the likelihood of fracture. In this paper, capacity design parameters are established that describe the axial strength and flexural strength of the cast components relative to the main hollow structural section member. These parameters are varied in 2D finite element models to understand the nature of the system and identify the best performing designs. 3D FE models of the CMDB system and a typical special concentrically braced frame, in combination with fracture indices, are used to compare the expected low cycle fatigue life of the two systems.

KW - Cast steel

KW - Concentrically braced frames

KW - Finite element analysis

KW - Seismic design

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ER -

A cast modular bracing system for steel special concentrically braced frames

Abstract

Keywords

ASJC Scopus subject areas

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