A cast modular bracing system for steel special concentrically braced frames

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

Research output: Contribution to journalArticlepeer-review

9 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 languageEnglish (US)
Pages (from-to)104-116
Number of pages13
JournalEngineering Structures
Volume45
DOIs
StatePublished - Dec 1 2012

Keywords

  • Cast steel
  • Concentrically braced frames
  • Finite element analysis
  • Seismic design

ASJC Scopus subject areas

  • Civil and Structural Engineering

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