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U.S. DESIGN OF STRUCTURES WITH DAMPING SYSTEMS Kit MIYAMOTO1 , Robert D. HANSON2 1Marr Shaffer & Miyamoto, Inc., 1450 Halyard Drive, West Sacramento 95691, USA E-mail: kit@msm1.com 2University of Michigan, 2926 Saklan Indian Drive, Walnut Creek 94595, USA ABSTRACT: Many applications of damper devices in both new and existing buildings in both United States and Japan have resulted from extensive damper device development efforts. The increased usage of this technology has created a demand for design guidance and building codes to specify their use in the United States. This paper provides a case study using code type design procedures. A two-story police headquarters in Vacaville, California with an area of 3,716m2 (40,000ft2) is summarized. This new building was designed with damping system following the 2000 NEHRP procedures as described in a companion paper. 1. Introduction This paper presents an earthquake design procedure and a case study of the Vacaville Police Headquarters. The earthquake design “goal” of this essential facility is to provide an immediate occupancy performance for a 475-year return seismic event. However, the project requirement is to keep the construction cost within typical code conformed buildings. The combination of Special Moment Resisting Frames (SMRF) and Fluid Viscous Dampers (FVDs) are used as the lateral force resistance system. This system as described by Gimmel, Lindorfer, and Miyamoto, (2002) results in cost efficiency and superior seismic performance. The 2000 NEHRP (FEMA, 2000) guideline was used to design the project, since it is considered to be a state-of-the-art procedure for seismic damping devices. This project becomes the first structure in the United States to use this advanced procedure. 2. Building Description The project is located in Vacaville, California, which is within a region of many active faults and high seismic activity. The structure is a 2-story, 40,000ft2 (3,716m2) steel framed structure. The roof is composed of metal deck and WF beams, and the floor is composed of 21/2-inch (6.4cm) lightweight concrete over 3-inch (7.6cm) metal deck and steel composite beams. The exterior finish is lightweight architectural finish over nonstructural metal stud walls. See figure 1 for architectural rendering. See figure 2 for the second floor structural plan. A perimeter SMRF is provided along the longitudinal direction. For the transverse direction, one-bay SMRF is provided at each column line. The location and quantity of SMRF is the same for the roof plan. A 24-inch (61.0cm) deep pad foundation is provided at WF columns. ©SEWC2002, Yokohama, Japan