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NEW EARTHQUAKE DEVICES INSTALLED IN SAN FRANCISCO BUILDING

 NEW EARTHQUAKE DEVICES INSTALLED IN SAN FRANCISCO BUILDING
 SAN FRANCISCO, Feb. 10 /PRNewswire/ -- A Wells Fargo Bank branch office opens its doors for business here today in what is the first building in the United States to be retrofitted with a series of locally invented devices designed to help minimize damage and preserve a structure's integrity during an earthquake.
 Seven of the devices -- known as Added Damping and Stiffness (ADAS) elements -- have been installed in the framework of the two- story, reinforced-concrete Wells Fargo building at One California Street. The patented ADAS concept was jointly developed by Bechtel Corp. and CounterQuake Corp. of Redwood City. The earthquake retrofit design for the building was a joint effort of CounterQuake and the Dames & Moore engineering firm, with the latter serving as engineer of record and lead consultant on the project.
 The ADAS elements are similar to the 200-plus devices that have already been installed in two office buildings in Mexico City, according to Dr. William H. White, an engineering manager and principal engineer at Bechtel Corp. The ADAS concept was patented by White and Bechtel.
 "We see the ADAS system as the answer for countless buildings throughout California and for similar earthquake-prone areas," said White. "Wells Fargo, true to its pioneering spirit, has sprinted well ahead of the pack by installing this state-of-the-art system on its premises."
 Dr. Roger E. Scholl, president of CounterQuake, explained that the main purpose of the ADAS elements is to reduce earthquake damage while providing a degree of protection beyond minimum code standards. The devices consist of a series of large X-shaped plates that are made of common ductile mild steel. The plates are designed to remain elastic for wind loads but to yield and dissipate energy during earthquakes. The elements have no mechanically moving parts and require no maintenance. ADAS elements are specifically designed for reinforced concrete and steel structures, rather than for unreinforced masonry buildings.
 In a reference to recent international political developments, Scholl praised those involved in this first-of-a-kind installation.
 "Although U.S. science and innovation have taken a bashing in recent months, this is an excellent example of how our nation's technology is still very much attuned to solving the problems of today," he said.
 Extensive earthquake simulation testing of the ADAS system was conducted at the University of Michigan and at the University of California at Berkeley in 1987 and 1988, prior to the first production of the elements in 1990, Scholl said.
 The California Street building had suffered moderate damage during the 1989 Loma Prieta earthquake. A study performed in mid-1991 by Thomas R. Varner of the Earthquake Engineering Group of Dames & Moore revealed that the structure would likely experience extensive damage during a severe earthquake emanating from either the San Andreas or Hayward faults. As a result of the study, Wells Fargo retained Dames & Moore last August to design a seismic upgrade for the building.
 Thomas Bender, vice president and division manager of retail facilities management for Wells Fargo, said the bank's requirements were that the structure be ready for occupancy by February of this year, and that the new seismic design provide a level of damage control during a major earthquake over and above the minimum life safety requirements of the local building code.
 A Dames & Moore structural design team -- consisting of Cynthia Perry, Eduardo Fierro, Dr. Hassan Sedarat and Varner -- said they chose ADAS as a solution for the building for two reasons:
 -- Reduced damage during a major quake since critical deformations of structures are less severe with such devices, and
 -- Reduced cost, since other methods would have required a foundation retrofit that would have affected a parking structure beneath the building.
 Stoltz Metals of Oakland fabricated the ADAS devices used in the Wells Fargo project, while Meddco Metals of Hayward fabricated the steel. Dinwiddie Construction Co., a leading San Francisco builder, was the general contractor.
 -0- 2/10/92
 NOTE: Photos of the ADAS elements are available by calling the number below.
 /CONTACT: Jeff Berger of Bechtel, 415-768-0326/ CO: Bechtel ST: California IN: CST SU: PDT


RM -- SF012 -- 8360 02/10/92 14:03 EST
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Publication:PR Newswire
Date:Feb 10, 1992
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