基于OpenSees非規(guī)則橋梁高墩抗震延性分析
發(fā)布時間：2018-10-18 09:34
【摘要】：我國西部地區(qū)受地形地貌的影響，修建公路和鐵路基礎(chǔ)設(shè)施時不得不建造眾多的高墩大跨橋梁，這些橋梁屬于典型的非規(guī)則橋梁，目前并無相關(guān)抗震規(guī)范可以直接應(yīng)用。對此類橋梁的抗震延性研究較少，遠遠達不到實際工程的需要。為了分析橋梁高墩在地震作用下的延性行為，，本論文主要做了以下一些工作： 通過OpenSees軟件建立了三個基于彈塑性纖維梁柱單元的墩柱模型，主要采用增量動力分析方法對墩柱模型的地震響應(yīng)特點進行了研究，非線性靜力推倒法作部分對比分析，得出墩柱在不同地震波激勵下的延性表現(xiàn)具有較大差異性，采用增量動力分析法評價墩柱位移延性能力較為精確。 由于實際橋梁結(jié)構(gòu)墩柱的墩頂受到上部結(jié)構(gòu)的一定程度約束作用，建立一個大跨連續(xù)剛構(gòu)橋的彈塑性有限元模型�？紤]到長周期地震波與普通地震波頻譜特性的明顯區(qū)別，因此對大跨連續(xù)鋼構(gòu)橋輸入三條普通地震波和兩條長周期地震波，分別分析了順橋向和橫橋向地震激勵下，長周期地震波和普通地震波對墩柱延性行為的影響。 結(jié)果表明：連續(xù)剛構(gòu)橋在順橋向和橫橋向長周期地震波激勵下盡管加速度峰值比普通地震波低很多，結(jié)構(gòu)就已進入相應(yīng)的屈服狀態(tài)和極限狀態(tài)。順橋向分別輸入長周期地震波和普通地震波時，墩柱的延性表現(xiàn)有著明顯的區(qū)別，而橫橋向輸入這些地震波時墩柱延性表現(xiàn)并無明顯的差別。
[Abstract]:Under the influence of topography and geomorphology, many long-span bridges with high piers have to be built in the construction of highway and railway infrastructure in western China. These bridges belong to the typical irregular bridges, and there are no relevant seismic codes to be directly applied at present. The research on seismic ductility of this kind of bridges is few and far from the need of practical engineering. In order to analyze the ductility behavior of high pier under earthquake, this paper mainly does the following work: through OpenSees software, three pier column models based on elastoplastic fiber Liang Zhu element are established. The characteristics of seismic response of pier model are studied by means of incremental dynamic analysis method. The nonlinear static push-down method is used for partial comparative analysis. It is concluded that the ductility of pier column under different seismic wave excitation is quite different. The incremental dynamic analysis method is used to evaluate the displacement ductility of piers. Because the pier top of bridge structure is restrained by superstructure to some extent, an elastic-plastic finite element model of long-span continuous rigid frame bridge is established. Considering the obvious difference between long-period seismic waves and ordinary seismic waves, three ordinary seismic waves and two long-period seismic waves are input to long-span continuous steel bridges. The effect of long period seismic wave and ordinary seismic wave on ductility behavior of pier column. The results show that the structure of the continuous rigid frame bridge has entered the corresponding yield state and limit state even though the peak acceleration is much lower than that of the normal seismic wave under the excitation of long period seismic wave along the bridge and the transverse bridge. The ductility of the pier column is obviously different from that of the normal seismic wave when the long period seismic wave is inputted along the bridge direction, but there is no obvious difference in the ductility performance of the pier column when the seismic wave is input to the transverse bridge direction.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441.3
[Abstract]:Under the influence of topography and geomorphology, many long-span bridges with high piers have to be built in the construction of highway and railway infrastructure in western China. These bridges belong to the typical irregular bridges, and there are no relevant seismic codes to be directly applied at present. The research on seismic ductility of this kind of bridges is few and far from the need of practical engineering. In order to analyze the ductility behavior of high pier under earthquake, this paper mainly does the following work: through OpenSees software, three pier column models based on elastoplastic fiber Liang Zhu element are established. The characteristics of seismic response of pier model are studied by means of incremental dynamic analysis method. The nonlinear static push-down method is used for partial comparative analysis. It is concluded that the ductility of pier column under different seismic wave excitation is quite different. The incremental dynamic analysis method is used to evaluate the displacement ductility of piers. Because the pier top of bridge structure is restrained by superstructure to some extent, an elastic-plastic finite element model of long-span continuous rigid frame bridge is established. Considering the obvious difference between long-period seismic waves and ordinary seismic waves, three ordinary seismic waves and two long-period seismic waves are input to long-span continuous steel bridges. The effect of long period seismic wave and ordinary seismic wave on ductility behavior of pier column. The results show that the structure of the continuous rigid frame bridge has entered the corresponding yield state and limit state even though the peak acceleration is much lower than that of the normal seismic wave under the excitation of long period seismic wave along the bridge and the transverse bridge. The ductility of the pier column is obviously different from that of the normal seismic wave when the long period seismic wave is inputted along the bridge direction, but there is no obvious difference in the ductility performance of the pier column when the seismic wave is input to the transverse bridge direction.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441.3
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