公路梁橋高阻尼隔震橡膠支座適用性研究
發(fā)布時間：2018-07-26 06:22
【摘要】：近年來,中國新建橋梁陸續(xù)開始采用減隔震支座,其中高阻尼隔震橡膠支座(HDR)既具有良好的耗能能力又經濟環(huán)保,同時安裝及檢修更換方便,具有廣闊的發(fā)展前景。目前,學者們對高阻尼隔震橡膠支座的工作機理、設計參數、計算公式、耐久性等方面進行了大量的理論和試驗研究,并取得了一些很有價值的研究成果。但高阻尼隔震橡膠支座在實際工程中的應用還很少,對該類支座參數的選擇及設計尚不完善,不利于高阻尼隔震橡膠支座的推廣和應用。本論文依托陜西省交通運輸廳科研項目(13-21K):梁式橋抗震構造措施的優(yōu)化研究,主要結合公路橋涵標準圖,通過數值模擬建立有限元模型,一方面采用不同等級地震時程對不同橋梁進行了動力時程分析,研究了標準跨徑的箱梁和T梁在不同橋墩高度、場地土類型、地震烈度和特征周期變化條件下,采用高阻尼隔震橡膠支座后橋梁結構的地震響應變化規(guī)律,研究結果表明:高阻尼隔震橡膠支座的采用使得中墩和邊墩共同受力,一起分擔地震作用。隨著橋墩高度5m~40m的變化,橋梁結構的支座位移、墩底彎矩整體上呈先增大后減小的規(guī)律,當橋墩高度較低時增幅較大,隨著墩高的增加增幅趨緩。隨著場地土類型I~IV的變化,橋梁結構的支座位移、墩底彎矩等地震響應值不斷增大。隨著地震烈度6度~9度的變化,橋梁結構的支座位移、墩底彎矩等地震響應值也不斷增大。另一方面根據已有支座參數表的計算結果表明,高烈度區(qū)軟弱場地土條件下,支座位移普遍超過支座的容許位移,部分甚至超過了極限位移。鑒于以上支座位移超限現(xiàn)象,本論文以支座位移值為控制目標,首先對超限支座增加支座剛度,然后結合限位裝置與連梁裝置控制過大位移的發(fā)生,完善高阻尼隔震橡膠支座參數選用表。本論文研究成果預期能夠促進已有支座抗震規(guī)范的不斷完善,同時滿足實際工程的設計要求,適應我國目前減隔震支座發(fā)展的需要,為高阻尼隔震橡膠支座的抗震設計提供參考。
[Abstract]:In recent years, newly built bridges in China have started to adopt shock isolation bearings, among which (HDR) with high damping isolation rubber bearings not only has good energy dissipation capacity but also is economical and environmental friendly. At the same time, it is convenient to install, repair and replace, and has a broad prospect of development. At present, scholars have carried out a lot of theoretical and experimental studies on the working mechanism, design parameters, calculation formulas and durability of high damping rubber bearings, and some valuable research results have been obtained. However, the application of high damping isolation rubber bearings in practical engineering is still few, and the selection and design of such bearing parameters are not perfect, which is not conducive to the popularization and application of high damping isolation rubber bearings. Based on the research project of Shaanxi Provincial Transportation Department (13-21K): the optimization of seismic construction measures of beam bridges, the finite element model is established by numerical simulation combined with the standard map of highway bridges and culverts. On the one hand, the dynamic time-history analysis of different bridges is carried out by using different earthquake time histories, and the box girder and T-beam with standard span are studied under the conditions of different piers height, site soil type, earthquake intensity and periodic variation of characteristic. The seismic response of bridge structure with high damping isolation rubber bearing is studied. The results show that the adoption of high damping isolation rubber bearing makes the middle pier and side pier bear the same force and share the earthquake action together. With the change of pier height 5m~40m, the support displacement and bending moment of bridge structure increase first and then decrease. When the height of pier is lower, the increase is larger, and the increase is slower with the increase of pier height. With the change of site soil type I~IV, the seismic response values of bridge structure such as support displacement, pier bottom bending moment and so on are increasing. With the change of seismic intensity of 6 degrees and 9 degrees, the support displacement of bridge structure, the bending moment of pier bottom and other seismic response values are also increasing. On the other hand, according to the calculation results of the existing support parameter tables, it is shown that under the condition of soft soil in the high intensity region, the displacement of the bearing generally exceeds the allowable displacement of the bearing, and some even exceeds the limit displacement. In view of the phenomenon that the displacement of the above support exceeds the limit, this paper takes the displacement value of the support as the control target, firstly increases the stiffness of the support, then combines the limit device and the connecting beam device to control the occurrence of the excessive displacement. Improve the selection of high damping rubber bearing parameters. The research results of this paper are expected to promote the continuous improvement of the existing seismic code for bearings, and to meet the design requirements of practical projects, and to meet the needs of the development of seismic isolation bearings in China at present. It provides a reference for the seismic design of high damping rubber bearing.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U442.55;U443.361
本文編號：2145144
[Abstract]:In recent years, newly built bridges in China have started to adopt shock isolation bearings, among which (HDR) with high damping isolation rubber bearings not only has good energy dissipation capacity but also is economical and environmental friendly. At the same time, it is convenient to install, repair and replace, and has a broad prospect of development. At present, scholars have carried out a lot of theoretical and experimental studies on the working mechanism, design parameters, calculation formulas and durability of high damping rubber bearings, and some valuable research results have been obtained. However, the application of high damping isolation rubber bearings in practical engineering is still few, and the selection and design of such bearing parameters are not perfect, which is not conducive to the popularization and application of high damping isolation rubber bearings. Based on the research project of Shaanxi Provincial Transportation Department (13-21K): the optimization of seismic construction measures of beam bridges, the finite element model is established by numerical simulation combined with the standard map of highway bridges and culverts. On the one hand, the dynamic time-history analysis of different bridges is carried out by using different earthquake time histories, and the box girder and T-beam with standard span are studied under the conditions of different piers height, site soil type, earthquake intensity and periodic variation of characteristic. The seismic response of bridge structure with high damping isolation rubber bearing is studied. The results show that the adoption of high damping isolation rubber bearing makes the middle pier and side pier bear the same force and share the earthquake action together. With the change of pier height 5m~40m, the support displacement and bending moment of bridge structure increase first and then decrease. When the height of pier is lower, the increase is larger, and the increase is slower with the increase of pier height. With the change of site soil type I~IV, the seismic response values of bridge structure such as support displacement, pier bottom bending moment and so on are increasing. With the change of seismic intensity of 6 degrees and 9 degrees, the support displacement of bridge structure, the bending moment of pier bottom and other seismic response values are also increasing. On the other hand, according to the calculation results of the existing support parameter tables, it is shown that under the condition of soft soil in the high intensity region, the displacement of the bearing generally exceeds the allowable displacement of the bearing, and some even exceeds the limit displacement. In view of the phenomenon that the displacement of the above support exceeds the limit, this paper takes the displacement value of the support as the control target, firstly increases the stiffness of the support, then combines the limit device and the connecting beam device to control the occurrence of the excessive displacement. Improve the selection of high damping rubber bearing parameters. The research results of this paper are expected to promote the continuous improvement of the existing seismic code for bearings, and to meet the design requirements of practical projects, and to meet the needs of the development of seismic isolation bearings in China at present. It provides a reference for the seismic design of high damping rubber bearing.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U442.55;U443.361
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