Seismic Design of Ordinary Structural Steel Systems (Recording)

For times when special or intermediate systems are not required, ordinary steel moment frames or braced frames are often an economical solution. Limited inelastic behavior is expected in ordinary steel systems and they are designed for higher seismic forces when compared to special, higher ductility systems. Due to this expected behavior, the heights of the ordinary systems are generally limited to 35 ft. or for single story structures up to about 60 ft. Even with these limitations, many projects in high-seismic areas can be designed using ordinary systems, avoiding the rigorous detailing and analysis requirements required for special and intermediate steel systems.

The seminar discusses ordinary moment frame (OMF) and ordinary concentrically braced frame (OCBF) steel systems based on ASCE 7-10 and the AISC Seismic Provisions (AISC 341-10) requirements including:

• ASCE 7 height limitations for ordinary steel systems including how to apply the exceptions to Table 12.2-1
• AISC Seismic Provisions that apply to all ordinary systems including the required axial strength of columns and slenderness ratio limitations
• Ordinary Moment Frame provisions including required strength and detailing requirements for the moment connections
• Ordinary Concentrically Braced Frame provisions including how to determine the required strength of brace connections and special requirements for V- or Inverted V


SPEAKER:
Jason Ericksen, S. E. is a licensed structural engineer in Illinois and has worked as a consulting engineer in the Chicago area in the commercial building and nuclear industry. Jason served as the Director of the American Institute of Steel Construction’s Steel Solutions Center where he was in charge of making sure that all engineering questions about the design and construction of structural steel buildings were answered correctly. Subsequently, Jason worked with S.K. Ghosh Associates Inc., where he provided technical support through publications, seminars, peer reviews, computer programs, and code interpretations and comparisons. Jason is currently Technology director at ATMI Precast, a full-service precast concrete manufacturer providing a complete range of structural and architectural panels across a broad spectrum of project types, from mid-rise office to residential and parking.