- 摘 要
-
(湖南大學土木工程學院，長沙 410082)
［摘要］ 為了判斷結構能否采用隔震技術，提出了名義剛度比的定義，即上部結構名義水平剛度與隔震層水平剛度之比。通過理論分析計算，得出不同基本周期的上部結構減震系數(shù)隨名義剛度比的變化曲線，曲線變化趨勢表明減震系數(shù)隨著名義剛度比的增加逐漸減小，當減震系數(shù)達到0.5以下時，隔震結構名義剛度比不宜小于17。為驗證減震系數(shù)隨名義剛度比變化曲線的合理性，進行了振動臺激振試驗，試驗對象為一個9層框架結構模型，根據(jù)設定的減震目標，由減震系數(shù)隨名義剛度比的變化曲線得到隔震結構的最小名義剛度比，對隔震層水平剛度設計后進行振動臺激振試驗。試驗結果表明，結構減震效果明顯，符合預期減震目標，減震系數(shù)隨名義剛度比的變化曲線可為隔震結構設計提供參考。
［關鍵詞］名義剛度比； 減震系數(shù)； 振動臺試驗； 隔震結構； 地震反應
中圖分類號：TU352 文獻標識碼：A文章編號：1002-848X(2021)12-0075-04
Application range of isolation structure based on nominal stiffness ratio
SHANG Shouping, LI Xiaoyu
(College of Civil Engineering, Hunan University，Changsha 410082，China)
Abstract: In order to determine whether seismic isolation technology can be used in a structure, the definition of nominal stiffness ratio was proposed, which is the ratio of the nominal horizontal stiffness of the superstructure to the horizontal stiffness of the isolation layer. Through theoretical analysis and calculation, it was obtained that the damping coefficient curve of superstructure with different basic periods changes alone with the nominal stiffness ratio, and the curve shows that the damping coefficient decreases obviously with the increase of the nominal stiffness ratio. When the damping coefficient reaches below 0.5, the nominal stiffness ratio should not be less than 17. To verify the rationality of damping coefficient curve, the vibration test of shaking table was carried out, the experimental object is a nine-story frame structure model, according to the set damping target, the minimum nominal stiffness ratio of isolation structure was obtained from damping coefficient curve, after designing the horizontal stiffness of the isolation layer, the vibration test of shaking table was carried out. The test results show that the damping effect is obvious, which is in line with the expected damping target, damping coefficient curve can provide a reference for the design of isolation structure.
Keywords:nominal stiffness ratio； damping coefficient； shaking table test； isolation structure； earthquake response
*國家十二五科技支撐計劃（2015BAL03B01）。
作者簡介：尚守平，教授，博士生導師，Email:sps@hnu.edu.cn。
