發(fā)電大橋高墩斜交橋抗震性能及參數(shù)影響分析
發(fā)布時間：2018-11-04 14:49
【摘要】：高墩斜交橋是山區(qū)公路上的常見橋型,但由于高墩斜交橋的上部結(jié)構(gòu)是斜交和下部結(jié)構(gòu)的高墩都有自身的受力特殊性,兩個特殊性組合在一起其地震反應(yīng)比一般的斜交橋要復(fù)雜。而現(xiàn)有高墩斜交橋抗震理論抗震和規(guī)范中對高墩斜交橋的抗震規(guī)定也比較空白。本文主要以發(fā)電大橋斜交橋為基礎(chǔ)進行抗震研究,主要做了以下工作：(1)以發(fā)電大橋為工程實例,選取橋墩最高的一聯(lián),運用有限元軟件Midas-civil建立發(fā)電大橋斜交橋的三維有限元模型,對發(fā)電大橋進行反應(yīng)譜分析,得出在E1地震作用和E2地震作用下,發(fā)電大橋內(nèi)力和支座位移滿足要求。(2)對發(fā)電大橋進行時程分析,將反應(yīng)譜分析中的不同地震烈度轉(zhuǎn)換成不同峰值的EI波,研究在不同地震烈度EI波作用下橋梁的地震反應(yīng),得出在設(shè)計常遇和罕遇地震烈度下的El Centro波作用下,發(fā)電大橋內(nèi)力和位移滿足抗震要求。(3)對發(fā)電大橋進行彈塑性分析,采用Midas-civil里的彈塑性纖維模型,對發(fā)電大橋的橋墩進行抗震彈塑性分析,在抗震設(shè)計E1地震作用和E2地震作用下,發(fā)電大橋各墩底截面混凝土和鋼筋滿足抗震要求,都在彈性狀態(tài)下,而當?shù)卣鹆叶葹?.30g的El Centro波作用下四個橋墩墩底截面會出現(xiàn)不同程度的裂縫,鋼筋也有部分屈服,矮墩的屈服狀態(tài)更明顯。(4)建立單跨斜交橋基本模型,以單一變量研究斜交橋在地震力作用下的受力與墩高、跨度、斜度參數(shù)變量的關(guān)系,從模型中提取斜交橋的墩底內(nèi)力,并對數(shù)據(jù)進行繪圖分析得出了隨著參數(shù)變化橋梁地震內(nèi)力的變化趨勢。同時對單跨模型還進行了以雙參數(shù)變化研究斜交橋在地震作用下受力與墩高、跨度、斜度三個參數(shù)兩兩組合同時變化變量的關(guān)系,得出對橋梁地震內(nèi)力的敏感性參數(shù)大小排序為墩高、斜交角度、跨徑。(5)建立兩跨斜交橋基本模型,以單一變量研究斜交橋在地震力作用下的受力與墩高、跨度、斜度參數(shù)變量的關(guān)系,從模型中提取斜交橋的墩底內(nèi)力,并對數(shù)據(jù)進行繪圖分析得出了隨著參數(shù)變化橋梁地震內(nèi)力的變化趨勢。參數(shù)分析中內(nèi)力變化趨勢與工程實例發(fā)電大橋高矮墩地震內(nèi)力情況可得出高墩斜交橋比一般斜交橋?qū)Φ卣鸱磻?yīng)更敏感。
[Abstract]:The skew bridge with high piers is a common bridge type on mountain highway. However, the superstructure of the skew bridge with high piers has its own particularity of force, because the superstructure of the skew bridge with high piers and the high piers of the substructure have their own characteristics. Combined with two particularities, the seismic response is more complex than that of the general skew bridge. However, the seismic regulation of high pier skew bridge is blank in the seismic theory and code of the existing high pier skew bridge. The main work of this paper is to study the earthquake resistance of the skew bridge of power generation bridge. The main work is as follows: (1) taking the power generation bridge as an engineering example, the highest pier of the bridge is selected. The finite element software Midas-civil is used to establish the three-dimensional finite element model of the oblique bridge of power generation bridge, and the response spectrum of the bridge is analyzed. The results show that under the action of E1 earthquake and E2 earthquake, The internal force and support displacement of the power generation bridge meet the requirements. (2) the time-history analysis of the power generation bridge is carried out, and the different seismic intensity in the response spectrum analysis is converted to the EI wave with different peak values. The seismic response of the bridge under the action of EI wave with different seismic intensity is studied. It is concluded that the internal force and displacement of the power generation bridge can meet the seismic requirements under the action of the El Centro wave under the design frequency and rare earthquake intensity. (3) the elastic-plastic analysis of the power generation bridge is carried out. The elastoplastic fiber model of Midas-civil is used to analyze the aseismic elastoplastic behavior of the pier of the power generation bridge. Under the seismic design of E1 earthquake and E2 earthquake, the concrete and reinforcement at the bottom section of the pier of the power generation bridge can meet the seismic requirements. When the seismic intensity is 0.30g El Centro wave, there will be cracks in the bottom section of the four piers, and the steel bar will yield partly. The yield state of short pier is more obvious. (4) the basic model of single-span skew bridge is established, and the relationship between the stress of skew bridge under seismic force and the parameter variables of pier height, span and slope is studied with a single variable. The internal forces at the pier bottom of the skew bridge are extracted from the model, and the variation trend of the seismic internal forces along with the change of the parameters is obtained by drawing and analyzing the data. At the same time, the single span model is used to study the relationship between the stress of skew bridge under earthquake and the combination of three parameters of pier height, span and slope. It is concluded that the order of the sensitive parameters for the seismic internal force of the bridge is pier height, oblique angle, span. (5) the basic model of the two-span skew bridge is established, and the single variable is used to study the force, pier height and span of the skew bridge under the action of seismic force. Based on the relationship of slope parameter variables, the internal forces of piers bottom of skew bridge are extracted from the model, and the variation trend of seismic internal forces of the bridge with the variation of parameters is obtained by drawing and analyzing the data. The variation trend of internal force in parameter analysis and the seismic internal force of high pier and short pier of power generation bridge can be concluded that the high pier skew bridge is more sensitive to seismic response than the general skew bridge.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：U442.55
本文編號：2310152
[Abstract]:The skew bridge with high piers is a common bridge type on mountain highway. However, the superstructure of the skew bridge with high piers has its own particularity of force, because the superstructure of the skew bridge with high piers and the high piers of the substructure have their own characteristics. Combined with two particularities, the seismic response is more complex than that of the general skew bridge. However, the seismic regulation of high pier skew bridge is blank in the seismic theory and code of the existing high pier skew bridge. The main work of this paper is to study the earthquake resistance of the skew bridge of power generation bridge. The main work is as follows: (1) taking the power generation bridge as an engineering example, the highest pier of the bridge is selected. The finite element software Midas-civil is used to establish the three-dimensional finite element model of the oblique bridge of power generation bridge, and the response spectrum of the bridge is analyzed. The results show that under the action of E1 earthquake and E2 earthquake, The internal force and support displacement of the power generation bridge meet the requirements. (2) the time-history analysis of the power generation bridge is carried out, and the different seismic intensity in the response spectrum analysis is converted to the EI wave with different peak values. The seismic response of the bridge under the action of EI wave with different seismic intensity is studied. It is concluded that the internal force and displacement of the power generation bridge can meet the seismic requirements under the action of the El Centro wave under the design frequency and rare earthquake intensity. (3) the elastic-plastic analysis of the power generation bridge is carried out. The elastoplastic fiber model of Midas-civil is used to analyze the aseismic elastoplastic behavior of the pier of the power generation bridge. Under the seismic design of E1 earthquake and E2 earthquake, the concrete and reinforcement at the bottom section of the pier of the power generation bridge can meet the seismic requirements. When the seismic intensity is 0.30g El Centro wave, there will be cracks in the bottom section of the four piers, and the steel bar will yield partly. The yield state of short pier is more obvious. (4) the basic model of single-span skew bridge is established, and the relationship between the stress of skew bridge under seismic force and the parameter variables of pier height, span and slope is studied with a single variable. The internal forces at the pier bottom of the skew bridge are extracted from the model, and the variation trend of the seismic internal forces along with the change of the parameters is obtained by drawing and analyzing the data. At the same time, the single span model is used to study the relationship between the stress of skew bridge under earthquake and the combination of three parameters of pier height, span and slope. It is concluded that the order of the sensitive parameters for the seismic internal force of the bridge is pier height, oblique angle, span. (5) the basic model of the two-span skew bridge is established, and the single variable is used to study the force, pier height and span of the skew bridge under the action of seismic force. Based on the relationship of slope parameter variables, the internal forces of piers bottom of skew bridge are extracted from the model, and the variation trend of seismic internal forces of the bridge with the variation of parameters is obtained by drawing and analyzing the data. The variation trend of internal force in parameter analysis and the seismic internal force of high pier and short pier of power generation bridge can be concluded that the high pier skew bridge is more sensitive to seismic response than the general skew bridge.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：U442.55
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