A Simple Methodology for the Seismic Passive Control of Irregular 3D Frames Using Friction Dampers
This chapter presents a simple performance-based design methodology of an analysis/redesign type for sizing and allocating friction dampers within existing 3D irregular framed structures in order to control seismic performance. The methodology allows the
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A Simple Methodology for the Seismic Passive Control of Irregular 3D Frames Using Friction Dampers Yael Daniel, Oren Lavan, and Robert Levy
Abstract This chapter presents a simple performance-based design methodology of an analysis/redesign type for sizing and allocating friction dampers within existing 3D irregular framed structures in order to control seismic performance. The methodology allows the determination of brace stiffness of all added damping devices, under a constant predetermined slip displacement, using analysis tools only. The methodology allows the design of an irregular framed structure of any type and is nondependent of the type of irregularity. Using this methodology, fully stressed design solutions are obtained in an example of a linear 3D setback frame undergoing an ensemble of ground motions.
19.1 Introduction Seismic design of structures is a very intriguing and important issue in the field of structural engineering. Severe earthquakes are not a very common event and are random in nature, making them hard to predict and design for, and once they occur, life-threatening situations and major structural destruction are likely to happen. When seismic structural protection had begun, life safety was the leading guide for design. However, in modern design, the emphasis has shifted to performancebased design, as modern seismic design philosophies acknowledge the economical
Y. Daniel • O. Lavan () Faculty of Civil and Environmental Engineering, Technion – Israel Institute of Technology, Haifa 32000, Israel e-mail: [email protected]; [email protected] R. Levy Department of Structural Engineering, Faculty of Engineering Sciences, Ben-Gurion University of the Negev, P.O.Box 653, Beer-Sheva 84105, Israel e-mail: [email protected] O. Lavan and M. De Stefano (eds.), Seismic Behaviour and Design of Irregular and Complex Civil Structures, Geotechnical, Geological and Earthquake Engineering 24, DOI 10.1007/978-94-007-5377-8__19, © Springer ScienceCBusiness Media Dordrecht 2013
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benefits of such designs. Structural performance is highly related to damage states within the structure. The most commonly used method of damage analysis in structures is the use of damage indices (DIs). A rich description of DIs may be found in the state-of-the-art review of Williams and Sexsmith (1995). Some response measures often associated with damage are drifts and energy dissipation, and structural performance can be efficiently achieved by controlling these parameters. When considering different irregularities of structures (either vertical irregularities, such as setback structures or horizontal asymmetric irregularities) undergoing ground motions, special attention has to be given to the behavior of the structure due to these irregularities, such as large torsional effects. Many works regarding different aspects of these phenomena can be found in the extensive reviews of Rutenberg and De Stefano 1997; De Stefano and Pintucchi 2008 as well as references within. One way to control
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