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Short Courses

SC1

Nonlinear Structural Analysis Methods Used in Modern Steel Design

 

Tuesday, March 22 | 1:00 p.m. - 5:00 p.m.

Speaker: Barry T. Rosson, PE, PhD - Florida Atlantic University 


$275 members* | $400 non-members (Add $50 if purchased on-site.) *The following qualify for Member pricing: 
AISC, CISC, NSBA, IMCA, SSRC, NISD. Registration is required for this short course.

Per Chapter C of AISC’s Specification for Structural Steel Buildings, second-order effects, geometric imperfections, and stiffness reductions due to inelasticity and residual stresses must be considered. Modern-day software programs are capable of analyzing these conditions, but designers who use them need to have a fundamental understanding of how these nonlinear analyses are completed, which elements of structural behavior are included and which are neglected, and the degree to which various methods of analysis have inherent limitations that can affect solution accuracy and consistency.

This course will provide an overview of:

  • Modeling geometric imperfections directly versus with notional loads

  • Equilibrium in the deformed configuration using an incremental second-order analysis approach versus the approximate amplification methods in Appendix 8

  • Elastic critical load analysis versus alternate methods to determine effective length factors

  • Inelastic behavior and analysis of steel beams and frames

  • Analysis of alternating loads that produce shakedown and incremental collapse conditions

 

4 PDH credits

SC2

Workshop: Designing Cross-frames & Diaphragms for Steel Bridges

 

Tuesday, March 22 | 1:00 p.m. - 5:00 p.m.

Speakers: Devin Altman, PE | Ronnie Medlock | Brandon Cheval 


FREE with conference registration | $275 members* | $400 non-members (Add $50 if purchased on-site). *The following qualify for Member pricing: AISC, CISC, NSBA, IMCA, SSRC, NISD. Registration is required for this short course.

Cross-frames and diaphragms are important steel bridge components as they provide stability to primary longitudinal girders and improve lateral or torsional stiffness and strength of the bridge system during construction and in-service. In horizontally curved bridges they transfer forces between adjacent girders to provide equilibrium; in straight bridges they have been historically designed to transmit wind loads. 

Over the last few years, the steel bridge industry has seen a general increase in the size of cross-frames used in steel I-girder bridges across the country, in terms of both the individual member sizes and the connections themselves, resulting in significant inefficiencies. On a cost per pound basis, the cost to fabricate cross-frames can be the most expensive part of any steel girder bridge project.

This workshop will review the design history of cross-frames, and then provide guidance to designers so that they can make better choices regarding cross-frame layouts, type, members, connections as well as loads, analysis, and design.  The workshop will walk through design decisions for cross-frames in bridges that are straight with low skew, straight and heavily skewed, horizontally curved, and horizontally curved with skewed supports.  For each bridge type the following topics will be presented: efficient cross-frame and framing plan layout decisions, analysis considerations, stability requirements, design loads, member design, and connection design.  Fabrication techniques for cross-frames and diaphragms will also be discussed, explaining why certain decisions will result in more efficient fabrication of cross-frames.