Aseismic Roof Isolation System Built with Steel Oval Elements: Exploratory Study

Author:

Villaverde Roberto1,Aguirre Manuel2,Hamilton Charles1

Affiliation:

1. Department of Civil and Environmental Engineering, University of California, Irvine, CA 92697

2. Instituto de Ingeniería, Universidad Nacional Autónoma de México, 04510 Mexico, D.F., Mexico

Abstract

Presented herein are the details of and results from an experimental study conducted to assess the feasibility and effectiveness of a proposed roof isolation system whose purpose is to reduce earthquake damage in buildings. The proposed isolation system entails the detachment of a building's roof from the rest of the building through the insertion of sliding bearings and the attachment of oval-shaped steel elements between the building's roof and the structure below. The objective is to form a simple resonant oscillator with a building's roof and these oval elements, with the roof providing the mass of the oscillator and the oval elements its spring and damper. An additional intention is to make the steel oval elements undergo a large number of inelastic deformation cycles and dissipate, as a result, a large portion of the energy transmitted to a building during an earthquake. The study involves the testing of a small steel frame on a shaking table alternatively with and without the proposed roof isolation system and a comparison of the story drifts and floor accelerations attained in each case. In the conducted tests, the suggested isolation technique effectively reduces the seismic response of the frame. It is concluded, thus, that the proposed roof isolation system has the potential for the development of an inexpensive and effective way to reduce earthquake damage in some buildings and merits further study.

Publisher

SAGE Publications

Subject

Geophysics,Geotechnical Engineering and Engineering Geology

Reference17 articles.

1. Device for Control of Building Settlement and for Seismic Protection

2. Antiseismic structure: damper-equipped elastic frame

3. Aguirre, M., and Chicurel, R., 1976. Absorción de energı́a por flexión plástica,Memoria del II Congreso de la ANIAC, Academia Nacional de Ingenierı́a, Monterrey, N.L., Mexico, pp. 617–631.

4. Aguirre, M., and Sánchez, A. R., 1989. Pruebas de elementos disipadores de energı́a sı́smica,Construcción y Tecnologı́a, Instituto Mexicano del Cemento y del Concreto,I(10), 7–18.

5. Aguirre, M., and Sánchez, A. R., 1990. Disipadores de energı́a sı́smica,Construcción y Tecnologı́a, Instituto Mexicano del Cemento y del Concreto,III(27), 15–19.

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