[パネル講演2]地盤・土木構造物の減衰特性(パネル討論会 : 構造物の動設計と減衰値(建築,土木,機械の実例))

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This paper describes an overview of damping characteristics of soil and civil engineering structures from laboratory tests, in-situ /field tests, shaking tables tests and forced vibration tests, and also its modeling for seismic response analyses. (1) The damping ratio(h) of various soil (sand, clay, gravel and rock), and concrete obtained from laboratory tests were summarized. They exhibit non-linear properties, and the h-γ relationships of soils are verified, and various models of soil are proposed for seismic response analyses of ground and civil engineering structures. (2) Damping ratio of cohesive soil ground, sandy ground and loam were about 1 〜 3%, 3 〜 5% and 5 〜 10% at low strain level, respectively. (3) The damping characteristics of civil engineering structures (PWR and BWR Nuclear Plants, Dam, Bridges, Buildings) obtained from forced vibration tests, microtremor measurements, and earthquake observations were summarized. These data are very useful for seismic response analysis of ground and civil engineering structures.
一般社団法人日本機械学会の論文
2002-01-11