報告書番号

U86038

タイトル（和文）

積層ゴムと弾塑性ダンパーで支持された実在免震構造物の振動特性－常時微動観測と起振実験による小変位領域の特性評価－

タイトル（英文）

VIBRATION CHARACTERISTICS OF THE SEISMICALLYISOLATED BUILDING SUPPORTED BY THE ELASTOMERS AND THE ELASTO-PLASTIC DAMPERS.-EVALUATION OF VIBRATION CHARACTERISTICS IN SMALL VIBRATION AMPLITUDE BASED ON

概要 （図表や脚注は「報告書全文」に掲載しております）

〔目的〕当初ではＦＢＲ等の耐震設計の合理化とコスト低減効果を目標として免震設計に関する研究を実施中である。免震機構の成立性を評価するためには，免振機構の要素単体実験のみならず実際の免振構造物の振動特性の把握と地震観測に基づく実証データの蓄積を図ることが不可欠である。このような背景を踏まえ，■奥村組が筑波研究所内に建設した，積層ゴムと弾塑性ダンパーから成る免震機構に支持された免震構造物（４階建，総重量２２５０トン）を対象に，各種振動実験を実施し，現在，地震観測を実施中である。本報告は，小変位領域の基本的な振動特性を把握することを目的として実施した常時微動観測，起振実験についてまとめたものであり，これらの実験結果より，免振構造物が小変位領域でも剛体的挙動を示し，建物を剛体と考

概要 （英文）

AS THE SEISMIC ISOLATION CONCEPT HAS RECENTLY BECOME THE CENTER OF WIDE INTEREST WITH THE HOPE OF COST REDUCTION AND STANDERDIZATION OF STRUCTURES SUCH AS NUCLEAR POWER PLANTS,A VARIETY OF SEISMIC ISOLATION DEVICES HAVE BEEN DEVELOPED. IN ORDER TO APPLY THESEISMIC ISOLATION DEVICES TO AN IMPORTANT STRUCTURE,ACCUMULATION OF DATA ON THE RELIABILITY OF THESE DEVICES IS ESSENTIAL. THEREFORE,CLOSE EXPERIMENTAL STUDIES ON LINEAR AND NONLINEAR BEHAVIOR OF A BASE ISOLATED BUILIDING CONSTRUCTED BY OKUMURA CORPORATION AT TSUKUBA SCIENCE CITY WERE MADE. THE ISOLATION DEVICE CONSISTS OF LAMINATED ELASTOMERIC RUBBER BEARINGS AND STEEL DAMPERS. THE FOLLOWING TESTS AND OBSERVATION WERE PERFORMED. (1)STATIC LOADING TESTS ON THE ISOLATION DEVICE ELEMENT (2)STATIC LOADING TESTS ON THE BASE ISOLATED BUILDING (3)FORCED VIBRATION TESTS ON THE BASE ISOLATED BUILDING (4)FREE VIBRATION TESTS ON THE BASE ISOLATED BUILDING (5)MICROTREMOR OBSERVATION OF THE ISOLATION BUILDING THE OBSERVATION OF EARTHQUAKE RESPONSES OF THE BUILDING HAS BEEN UNDER WAY SINCE SEPTEMBER IN 1986. THIS PAPER DESCRIBES MAJOR TEST RESULTS OF THE FORCED VIBRATION TESTS CONDUCTED ON THE BASE ISOLATED BUILDING. IN ADDITION,THE RESULTS OF THE OBSERVATION OF MICROTREMORE ARE COMPARED WITH THE ABOVE MENTIONED TEST RESULTS. FROM THESE RESULTS,THE BASE ISOLATED BUILDING SHOWS RIGID MODE IN SMALL VIBRATION AMPLITUDE. THE BEHAVIOR OF THE BASE ISOLATED BUILDING CAN BE EXPLAINED BY USING RIGID ANALYTICAL MODEL.

報告者

キーワード