Design of Semi-Continuous Braced Frames

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Design of Semi-Continuous Braced Frames

CONTENTS:
  • PRINCIPLES OF SEMI-CONTINUOUS DESIGN
  • CONNECTIONS
  • DESIGN FOR THE ULTIMATE LIMIT STATE
  • DESIGN FOR THE SERVICEABILITY LIMIT STATE
  • DESIGN PROCEDURES

In a semi-continuous frame the degree of continuity between the beams and
columns is greater than that assumed in simple design, but less than that assumed
in continuous design. The degree of continuity can be chosen to produce the most
economic balance between the primary benefits associated with these two
traditional alternatives.

This document presents a method of analysis and design which permits
semi-continuous braced steel frames to be designed by hand. The method is only
marginally more complex than that for simple design, and the connection details
are straightforward (and therefore inexpensive). Connection forces and moments
can be chosen so that column stiffening is not required. Despite this economy of
both design effort and fabrication costs, when compared with simple design, it is
possible to achieve:
  • reduced beam depths
  • C reduced beam weights
Orthodox building frames generally comprise an assembly of beams and columns.
The connections between the beams and columns are traditionally assumed to be
either pinned, or able to achieve full moment continuity. Alternatively, it may be
assumed that the connections transmit some moment, whilst permitting some
relative rotation between the beam and column. The design and detailing of the
connections, and the frame design method, must reflect the assumptions made
about connection behaviour.

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