Accession Number : ADA299140

Title :   Seismic Retrofit of Existing Concrete Frame Structures Using Viscoelastic Damping Devices: A Research-in-Progress Update.

Descriptive Note : Interim rept.,

Corporate Author : CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN IL

Personal Author(s) : Hayes, John R., Jr. ; Dausman, Elizabeth M. ; Umbright, Brian L. ; Foutch, Douglas A. ; Wood, Sharon L.

PDF Url : ADA299140

Report Date : JUL 1995

Pagination or Media Count : 32

Abstract : The U.S. Army and Air Force have large inventories of concrete frame buildings built before the 1971 San Francisco earthquake, when seismic provisions in U.S. building codes were enhanced. Consequently, many of these buildings may not safely withstand the ground motions associated with large intensity earthquakes. The U.S. Army Construction Engineering Research Laboratories (USACERL) has developed a program to provide improved technologies for mitigating seismic hazards in older military buildings. This study investigated the effectiveness of a nonintrusive rehabilitation technique involving the addition of viscoelastic damping devices to a concrete structure. A one-third scale model of a concrete building was built and placed on the USACERL shaking table. The building was earthquake-tested using two sizes of dampers, and with no dampers in place. Preliminary observations showed that the model with dampers sustained only minimal damage. More detailed analysis continues.

Descriptors :   *BUILDINGS, *EARTHQUAKE ENGINEERING, *RETROFITTING, *STRUCTURAL ENGINEERING, HAZARDS, SIZES(DIMENSIONS), SCALE MODELS, VISCOELASTICITY, INTENSITY, DAMPING, CONCRETE, GROUND MOTION, SEISMIC WAVES, INVENTORY, AIR FORCE FACILITIES, FRAMES, REHABILITATION, SEISMOLOGY, SHAKING, VIBRATORS(MECHANICAL).

Subject Categories : Construction Equipment, Materials & Supplies
      Seismology

Distribution Statement : APPROVED FOR PUBLIC RELEASE