基于非線性能量反應譜的鉛芯橡膠支座隔震系統(tǒng)研究
發(fā)布時間：2018-08-24 15:12
【摘要】：地震輸入結構的能量絕大部分由基礎隔震系統(tǒng)消耗。為了在確保罕遇地震作用下結構安全,同時充分發(fā)揮基礎隔震系統(tǒng)效能,研究者必須精確快速地預測基礎隔震系統(tǒng)的地震反應。本文采用Bouc-Wen非線性滯回模型模擬基礎隔震系統(tǒng),對基于Bouc-Wen非線性滯回模型的能量譜,以及應用非線性能量譜進行橡膠支座隔震系統(tǒng)的反應分析方法進行了研究,其研究工作如下： 1)采用Bouc-Wen非線性滯回模型模擬基礎隔震系統(tǒng),建立單自由度基礎隔震結構模型,基于龍格庫塔方法推導能量反應時程分析和非線性能量譜公式,并便用Matlab編寫時程和能量譜分析計算程序。 2)使用20條地震波計算我國抗震規(guī)范規(guī)定的Ⅱ類場地、第三組設計地震分組,設計基本地震加速度為0.30g地區(qū)的隔震建筑,在遭遇罕遇地震時,隔震周期T=ls-6s對應的總滯回耗能譜EY(T)、總阻尼耗能譜ED(T)、總輸入能譜E1(T)和延性需求譜μ’(T),并給出其統(tǒng)計結果。 3)提出鉛芯橡膠基礎隔震系統(tǒng)延性系數(shù)μ’與能量指標RY/E1的關系μ'=μ'(EY/EI),建立相應數(shù)據(jù)庫。 4)結合我國現(xiàn)行抗震規(guī)范,建立一種基于能量譜的隔震結構反應預測和驗算方法。 5)以一個7層的鉛芯橡膠支座基礎隔震結構為例,進行非線性多自由度時程分析,時程分析結果與基于能量譜的隔震結構反應預測和驗算結果進行對比,結果表明本文建立能量譜及其反應預測和驗算方法是有效和可靠的。
[Abstract]:In order to ensure the safety of the structure under rare earthquakes and give full play to the effectiveness of the base isolation system, researchers must accurately and quickly predict the seismic response of the base isolation system. Based on the energy spectrum of Bouc-Wen nonlinear hysteretic model and the response analysis method of rubber bearing isolation system with nonlinear energy spectrum, the research work is as follows:
1) The Bouc-Wen nonlinear hysteretic model is used to simulate the base-isolated system, and the single-degree-of-freedom base-isolated structure model is established. Based on Runge-Kutta method, the energy response time-history analysis and nonlinear energy spectrum formula are deduced.
2) Twenty seismic waves are used to calculate the class II sites stipulated in the code for seismic resistance of China. The third group is divided into design seismic groups. The isolated buildings with basic seismic acceleration of 0.30g are designed. When encountering rare earthquakes, the total hysteretic energy spectrum EY (T), total damping energy spectrum ED (T), total input energy spectrum E1 (T) and ductility demand spectrum mu'(T) corresponding to the isolation period T=ls-6s are calculated. And its statistical results are given.
3) The relationship between ductility coefficient of lead rubber base isolation system and energy index RY/E1 is proposed and the corresponding database is established.
4) Based on the current seismic code of our country, a method for predicting and checking the response of isolated structures based on energy spectrum is established.
5) Taking a 7-storey lead rubber bearing base isolation structure as an example, the nonlinear multi-degree-of-freedom time-history analysis is carried out. The results of time-history analysis are compared with those of response prediction and checking calculation based on energy spectrum. The results show that the energy spectrum and its response prediction and checking method are effective and reliable.
【學位授予單位】：湖南大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU352.12
本文編號：2201211
[Abstract]:In order to ensure the safety of the structure under rare earthquakes and give full play to the effectiveness of the base isolation system, researchers must accurately and quickly predict the seismic response of the base isolation system. Based on the energy spectrum of Bouc-Wen nonlinear hysteretic model and the response analysis method of rubber bearing isolation system with nonlinear energy spectrum, the research work is as follows:
1) The Bouc-Wen nonlinear hysteretic model is used to simulate the base-isolated system, and the single-degree-of-freedom base-isolated structure model is established. Based on Runge-Kutta method, the energy response time-history analysis and nonlinear energy spectrum formula are deduced.
2) Twenty seismic waves are used to calculate the class II sites stipulated in the code for seismic resistance of China. The third group is divided into design seismic groups. The isolated buildings with basic seismic acceleration of 0.30g are designed. When encountering rare earthquakes, the total hysteretic energy spectrum EY (T), total damping energy spectrum ED (T), total input energy spectrum E1 (T) and ductility demand spectrum mu'(T) corresponding to the isolation period T=ls-6s are calculated. And its statistical results are given.
3) The relationship between ductility coefficient of lead rubber base isolation system and energy index RY/E1 is proposed and the corresponding database is established.
4) Based on the current seismic code of our country, a method for predicting and checking the response of isolated structures based on energy spectrum is established.
5) Taking a 7-storey lead rubber bearing base isolation structure as an example, the nonlinear multi-degree-of-freedom time-history analysis is carried out. The results of time-history analysis are compared with those of response prediction and checking calculation based on energy spectrum. The results show that the energy spectrum and its response prediction and checking method are effective and reliable.
【學位授予單位】：湖南大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU352.12
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，本文編號：2201211
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