報告書番号

382006

タイトル（和文）

鉛直地震動による建物の応答特性－鉄筋コンクリート１０階建構造物の地震観測結果の検討－

タイトル（英文）

RESPONSE CHARACTERISTICS OF BUILDINGS AGAINST VERTICAL SEISMIC FORCE -VERTICAL RESPONSE OBSERVATION OF TEN-STORIED BUILDING DURING NEAR SOURCED EARTHQUAKES-

概要 （図表や脚注は「報告書全文」に掲載しております）

原子力構造物をはじめ重要な構造物に対し，上下動振動に関する地震応答に大きな関心が寄せられ，特に，内陸性の地震動による震害例から上下方向の地震動成分に対する構造物の観測が望まれているが，構造物の応答観測例は以外と少ない。本報告は鉛直地震動による構造物の上下応答観測の具体例を示し，鉛直応答解析モデル化の方法の１例を提案したものである。観測した建物は高さ４０ｍ，巾２２ｍ，奥行２２ｍの鉄骨コンクリート構造であり，杭基礎（くい長さ２４ｍ）で砂層地盤に支持してある。その結果，■地表の地震動成分の水平振巾と上下振巾の比は，おおよそ１：０．５であった。■建物の上下応答が認められ，基礎と屋上の間で１．９倍であった。■上下動記録には構造物の水平成分から派生する上下成分を多く含む。■上下動の共振振動数は，質点系モデルや棒のたて振動として，鉛直剛性の異るコアと柱に分けて取扱うことで，実用上説明できた。

概要 （英文）

THE RESPONES CHARACTERISTICS OF THE STRUCTURES SUCH AS THE NUCLEAR POWER PLANT AGAINST THE VERTICAL VIBRATIONS CAUSED BY THE SEISMIC FORCE HAVE BECOME THE GREAT CONCERNS OF EARTHQUAKE ENGINEERS. WE THE RESEARCH STAFFS OF CRIEPI HAVE CONDUCTED EARTHQUAKE OBSERVATION OF THE STRUCTURE USING AN ACTUAL STEEL FRAMED AND REINFORCED CONCRETE BUILDING(A BUILDING OF ABOUT 40 METERS HIGH)IN ORDER TO OBTAIN THE OBSERVATIONAL DATA OF THE RESPONSE CHARACTERISTICS OF THIS BUILDINGAGAINST THE VERTICAL SEISMIC FORCE. THE REPORT SHOWS THE RESULT OF THEACTUAL VERTICAL RESPONSES OF THE BUILDING AGAINST VERTICAL SEISMIC FORCE, AND MAKES A PROPOSAL CONCERNING THE MODEL FOR THE DYNAMIC ANALYSIS OF THE VERTICAL RESPONSES OF THE STRUCTURE. THE RESULTS ARE AS FOLLOWS.1)THE AMPLITUDE OF THE MAXIMUM ACCELERATION OF THE VERTICAL COMPONENT (OF THE SEISMIC FORCE)ON THE SURFACE OF THE GROUND WAS ABOUT 0.5 TIMES THAT OF THE HORIZONTAL COMPONENT.2)THE VERTICAL RESOPOSE OF THE BUILDINGTO THE VERTICAL SEISMIC FORCE WAS RECOGNIZED, AND THE AVERAGE RESPONSEAT THE BASE OF THE BUILDING WAS 2.6 TIMES THAT AT THE TIP OF THE PILE(-24M),WHILE THE ONE AT THE BASE WAS 1.9 TIMES THAT AT THE ROOF OF THE BULIDING ON AVERAGE.3)THE VERTICAL VIBRATION OF THE BUILDING INCLUDED THE COMPONENT RESULTING FROM THE INTERACTION BETWEEN THE GROUND AND THE BUILDING,AND THE RESONANT FREQUENCY OF SUCH COMPONENT WAS 5.5HZ.4)THE VERTICAL RESONANT VIBRATION OF THE BUILDING CAN BE EXPLAINED PRACTICALLY BY TREATING IT AS THE VERTICAL VIBRATION OF THE MODEL OF THE LUMPED MASS SYSTEMS OR THE ELASTIC BAR THAT VARIES DEPENDING ON THE VERTICAL RIGIDITY OF THE STRUCTURES SUCH AS THE CENTRAL CORE PART AND THE CIRCUMFERENTICAL COLUMN PART.

報告者

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