Chapter 09-Seismic Design of Steel Structures

Chapter 09-Seismic Design of Steel Structures - Chapter 9...

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409 Chapter 9 Seismic Design of Steel Structures Chia-Ming Uang, Ph.D. Professor of Structural Engineering, University of California, San Diego Michel Bruneau, Ph.D., P.Eng. Professor of Civil Engineering, State University of New York at Buffalo Andrew S. Whittaker, Ph.D., S.E. Associate Professor of Civil Engineering, State University of New York at Buffalo Key-Chyuan Tsai, Ph.D., S.E. Professor of Civil Engineering, National Taiwan University Key words: Seismic Design, Steel Structures, NEHRP Recommended Seismic Provisions, AISC Seismic Provisions, R Factor, Ductility, System Overstrength, Capacity Design, 1994 Northridge Earthquake, Moment-Resisting Frames, Brittle Fracture, Moment Connections, Concentrically Braced Frames, Buckling, Braces, Eccentrically Braced Frames, Links. Abstract: Seismic design of steel building structures has undergone significant changes since the Northridge, California earthquake in 1994. Steel structures, thought to be ductile for earthquake resistance, experienced brittle fracture in welded moment connections. The latest AISC Seismic Provisions reflect the significant research findings that resulted from the Northridge earthquake. This chapter first starts with a description of the seismic design philosophy, the concept of system parameters ( R , C d , and o ) and capacity design. Background information for the seismic requirements in the AISC Seismic Provisions of Moment Frames, Concentrically Braced Frames, and Eccentrically Braced Frames are then presented. Design examples are provided for each of the three structural systems.
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410 Chapter 9
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9. Seismic Design of Steel Structures 411 9.1 Introduction 9.1.1 General Steel is one of the most widely used materials for building construction in North America. The inherent strength and toughness of steel are characteristics that are well suited to a variety of applications, and its high ductility is ideal for seismic design. To utilize these advantages for seismic applications, the design engineer has to be familiar with the relevant steel design provisions and their intent and must ensure that the construction is properly executed. This is especially important when welding is involved. The seismic design of building structures presented in this chapter is based on the NEHRP Recommended Provisions for the Development of Seismic Regulation for New Buildings (BSSC 1997). For seismic steel design, the NEHRP Recommended Provisions incorporate by reference the AISC Seismic Provisions for Structural Steel Buildings (1997b). 9.1.2 NEHRP Seismic Design Concept The NEHRP Recommended Provisions are based on the R -factor design procedure. In this procedure, certain structural components are designated as the structural fuses and are specially detailed to respond in the inelastic range to dissipate energy during a major earthquake. Since these components are expected to experience significant damage, their locations are often selected such that the damage of these components would not impair the gravity load-carrying capacity of the system. Aside from these energy dissipating
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Chapter 09-Seismic Design of Steel Structures - Chapter 9...

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