Shear-wall retrofit

Article Abstract:

A dual wall-frame system was used to improve the earthquake resistance of Pacific Gas and Electric Co.'s San Francisco headquarters and protect its terracotta facade. The retrofitting technique results in two or more parallel walls connected by shear yielding coupling beams and/or flexurally yielding frame beams. With this design, plastic deformation is distributed vertically throughout the building instead of being concentrated on a few floors. Damage to weaker walls is reduced since the beams are designed to fail before plastic action begins to develop at the walls.

Buildings and facilities, Office buildings, Maintenance and repair, PCG, Walls, Pacific Gas and Electric Co.

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Historic upgrades in San Francisco

Article Abstract:

The San Francisco Civic Center complex was adversely affected by the 1989 Loma Prieta earthquake. Most the buildings damaged were historical landmarks. However, the said natural disaster paved the way for the state government to initiate restoration and rehabilitation projects aimed at upgrading these historic buildings. The historic buildings to be upgraded to withstand seismic activities include the San Francisco City Hall, the State Supreme Court, a civic auditorium, the Main Public Library and an opera house.

Remodeling and renovation, Historic buildings, Historic sites, San Francisco, California, City halls, Loma Prieta Earthquake, 1989

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Corps begins work on California dam

Article Abstract:

The US Army Corps has started the construction of the Seven Oaks Dam in California in Sept. 1995 to help control the flow of the Santa Ana River during the rainy season. Since the dam is located near the San Andreas fault, it has been designed to withstand a magnitude 8 earthquake or a vertical displacement of 1.3 meters. Clay and gravel have also been added to the granite in the region to address rock fracture and erosion in high runoff conditions.

Design and construction, Dams, Earth dams

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