Seismic retrofit of historic nonductile concrete building with brick masonry infills. 158,000 sf.
Royce Hall, a five-story UCLA landmark concrete-and-masonry-infill building, was seismically strengthened to preserve its significant historic value. The goal was to ensure that a major earthquake would not damage the museum-quality brick masonry and delicate interior fabric. Weidlinger Associates assisted the engineer of record by setting the design criteria; modeling all beams, columns and wall; and performing three-dimensional computer analyses of the building. Nondestructive in-situ testing determined the properties of the masonry infills, which were used in nonlinear finite element analyses to determine the allowable drifts. The nonlinear properties of the concrete shear walls were obtained from moment-curvature analysis. Seismic strengthening was achieved by adding new shear walls to limit displacement and story drift. During installation of the new seismic-resisting system, the existing systems were modified without damage to the historic fabric.
Completion Date: 1997 Location: Los Angeles, California Owner or Client: University of California Prime Consultant(s): Barton Phelps & Associates