1. Aisc Specifications

Modern Steel Construction July 2013: Page 17 Menu. steelwise A brief overview of what’s new in the 2nd Edition AISC Seismic Design Manual.

SEISMIC UpgRaDE By Cynthia j. DunCan anD leigh arBer, P.e. EaRLIER ThIS yEaR, AISC introduced the 2nd Edition of the Seismic Design Manual.

Built upon the 2010 AISC Seismic Provisions for Structural Steel Buildings, the new Seismic Design Manual provides addi-tional discussion and design examples and demonstrates the application of that standard. It is organized as follows: ➤ Part 1: General Design Considerations ➤ Part 2: Analysis ➤ Part 3: Systems not Specifically Detailed for Seismic Resistance ➤ Part 4: Moment Frames ➤ Part 5: Braced Frames ➤ Part 6: Composite Moment Frames ➤ Part 7: Composite Braced Frames and Shear Walls ➤ Part 8: Diaphragms, Collectors and Chords ➤ Part 9: Provisions and Standards ➤ Part 10: Engineered Damping Systems Part 9 includes the 2010 AISC Seismic Provisions and the 2010 AISC Prequalified Connections for Special and Intermediate Steel Moment Frames for Seismic Applications. Some topics in the new edition are expanded from the 1st Edition while others, such as analysis and composite systems, are new. There are several other changes as well.

In addition to the burgundy cover, one of the obvious updates is the inclusion of both load and resistance factor design (LRFD) and allow-able strength design (ASD) methods throughout the design examples. There was also a concerted effort by the committee responsible for the maintenance of the Seismic Design Manual to incorporate expanded discussion for each chapter, as well as expanded explanatory text and figures in the design examples themselves.

Aisc Specifications

As part of this effort the 2nd Edition Seismic Design Manual illustrates more of the seismic design and detailing concepts and also offers alternatives in design that readers can consider in their own projects. For example, the special moment frame connection design example illustrates full design checks for doubler and continu-ity plates and their required welds, as shown in Figure 1. As an alternative, the example calculates the next largest column for which this extra panel zone detailing would not be required, so that readers can understand the options available and choose the best one for each application. In addition, by including step-by-step descriptions and citing the applicable sections and equations from the AISC Specification for Structural Steel Build-ings and the AISC Seismic Provisions used in each example, the new Seismic Design Manual will prove to be an effective refer-ence for designers. Note: For weld backing requirements, see anSi/aiSC 358 Chapter 3.

Figure 1: SMF panel zone detailing from Seismic Design Manual example 4.3.4. Duncan ( duncan@aisc.org ) is director of engineering and Leigh arber ( arber@aisc.org ) is a senior engineer, both with aiSC. July 2013 MODERN STEEL CONSTRUCTION 17 Issue Articles steelwise SEISMIC UPGRADE Cynthia J DunCan & Leigh Arber Visit Article:.