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Seismic Evaluation of Steel Joints for UCLA Center for Health Science Westwood Replacement Hospital
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The Northridge earthquake of January 17, 1994, dramatically demonstrated that welded moment connections in Special Moment Resisting Frames (SMRF) were susceptible to damage during earthquakes. This damage initiated the requirements for qualifying cyclic tests of beam-to-column connections. The purpose of these requirements is to provide evidence that moment connections satisfy the code requirements of strength and inelastic rotations. Realizing this fact, John A. Martin, Inc. engineers initiated a study to evaluate experimentally the response of the moment connections of the UCLA Center for Health Science Westwood replacement hospital. The JAMA moment connection utilized a variety of concepts including bottom haunch, top cover plate, beam web stiffener, and reduced beam section (RBS). In this concept, the cross section of the beam is intentionally reduced within a segment to produce an intended plastic hinge zone, located within the beam span away from the column face. While the bottom haunch and the top cover plate substantially reduces the seismic demand at the face of the column by the added strength and stiffness. The buckling of the web at the plastic hinge region is effectively postponed via the horizontal web stiffeners.
Report No. CCEER-00-5