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Telecommunications Facilities Earthquake Readiness Since San Fernando

by Larry Wong, Pacific Bell, San Ramon, United States,



Document Type: Proceeding Paper

Part of: Lifeline Earthquake Engineering

Abstract:

The vertical rack architecture of telecommunication offices showed some weaknesses during the San Fernando earthquake in 1970. Efforts have been made since then to improve performance of offices. Older equipment were fitted with overhead braces and auxiliary framing reinforcements were developed. The development of digital switches to replace analog switches created the opportunity for new equipment packaging. Cabinets were used instead of upright racks with stiffer frames to reduce stress to equipment Free standing designs were developed so overhead ironwork would not be necessary. The miniaturization of electronics and development of integrated circuits allow reduction in size of packaging and of mass.

Subject Headings: Earthquakes | Communication systems | Equipment and machinery | Structural design | Seismic design | Structural reliability | Load and resistance factor design | California | United States

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