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Title: Base isolation: Fresh insight

Base isolation: Fresh insight The objective of the research is a further development of the engineering concept of seismic isolation. Neglecting the transient stage of seismic loading results in a widespread misjudgement: The force of resistance associated with velocity is mostly conceived as a source of damping vibrations, though it is an active force at the same time, during an earthquake type excitation. For very pliant systems such as base isolated structures with relatively low bearing stiffness and with artificially added heavy damping mechanism, the so called `damping`` force may occur even the main pushing force at an earthquake. Thus, one of the two basic pillars of the common seismic isolation philosophy, namely, the doctrine of usefulness and necessity of a strong damping mechanism, is turning out to be a self-deception, sometimes even jeopardizing the safety of structures and discrediting the very idea of seismic isolation. There is a way out: breaking with damping dependancy.
Authors:
Publication Date:
OSTI Identifier:OSTI ID: 10181073
Report Number(s):BCS--9214754
ON: DE93040225; CNN: Grant BCS-9214754
Resource Type:Technical Report
Resource Relation:Other Information: PBD: 15 Jul 1993
Research Org:Seismic Risk Evaluation Scientific Consulting Co., Los Angeles, CA (United States)
Sponsoring Org:National Science Foundation, Washington, DC (United States)
Country of Publication:United States
Language:English
Subject: 42 ENGINEERING; SEISMIC ISOLATION; SHOCK ABSORBERS; MATHEMATICAL MODELS; SOIL-STRUCTURE INTERACTIONS; DAMPING; GROUND MOTION; SHEAR 420200; FACILITIES, EQUIPMENT, AND TECHNIQUES