【摘要】：由于懸索橋具有卓越的跨越能力,現(xiàn)在已經(jīng)成為在高烈度山區(qū)高速公路大跨橋梁中極具競爭力的橋型。然而傳統(tǒng)PC橫梁懸索橋橋塔重量和剛度都比較大,在地震荷載作用下容易發(fā)生破壞,特別是橫梁的抗剪驗算不容易通過。波形鋼腹板PC組合梁具有結(jié)構(gòu)自重輕、剛度小、抗剪承載力高、地震荷載作用下的內(nèi)力響應(yīng)小等優(yōu)點,較符合高烈度地區(qū)懸索橋橋塔橫梁的受力需求,而現(xiàn)在波形鋼腹板PC組合梁抗震性能的研究幾乎沒有涉及懸索橋橋塔橫梁應(yīng)用的研究內(nèi)容。所以有必要研究這種結(jié)構(gòu)在地震荷載作用下的受力特點。本論文進行了這方面的探討和研究,具體研究內(nèi)容和成果如下:以某單跨鋼桁梁懸索橋為工程背景,在考慮加勁梁與橋塔連接處縱向阻尼器作用,以及樁土之間相互作用的基礎(chǔ)上建立相應(yīng)的懸索橋有限元模型。橋塔分別擬定2道橫梁、3道橫梁、4道橫梁三種不同的橫梁方案,每一種方案分為波形鋼腹板PC組合梁及PC箱梁兩種類型,一共6個不同的橋塔模型,運用時程分析法計算不同橫梁類型以及不同橫梁數(shù)量橋塔在地震荷載的內(nèi)力響應(yīng)。選擇地震荷載作用下內(nèi)力響應(yīng)最優(yōu)的3道橫梁方案,運用截面抗震分析軟件XTRACT分析橋塔不同橫梁材料上、中、下橫梁的屈服彎矩,結(jié)合同一模型不同荷載工況下橋塔的內(nèi)力響應(yīng),對比波形鋼腹板PC組合橫梁橋塔與PC箱梁橋塔的極限承載力和破壞過程。運用有限元軟件ANSYS建立不同頂?shù)装搴穸炔煌瑢捒绫鹊?個模型,計算得出頂?shù)装寮袅禂?shù)。通過對比分析剪力滯系數(shù)的大小和分布規(guī)律,了解幾何構(gòu)造對波形鋼腹板PC組合橫梁剪力滯系數(shù)的影響,再結(jié)合施工現(xiàn)場應(yīng)變計測試數(shù)據(jù)校核有限元計算結(jié)果。計算分析結(jié)果表明:在相同地震荷載作用下,波形鋼腹板PC組合橫梁橋塔的最不利彎矩和剪力都明顯小于PC橫梁橋塔的結(jié)果;隨著橋塔橫梁數(shù)量的增加,下、中橫梁的最不利彎矩和剪力呈現(xiàn)出逐步增加的趨勢;上橫梁的最不利彎矩和剪力呈現(xiàn)出逐步減小的趨勢;波形鋼腹板PC組合梁橫梁橋塔相對于普通PC橫梁橋塔可以提高橋塔初次發(fā)生破壞的荷載強度,有效提高橋塔的抗震極限承載力;波形鋼腹板PC組合梁頂?shù)装搴穸仍酱?剪力滯效應(yīng)曲線也就越趨于平均;外側(cè)腹板區(qū)域的剪力滯系數(shù)隨著梁寬度的增加而迅速提高,內(nèi)側(cè)腹板區(qū)域的剪力滯系數(shù)隨著梁寬度的增加而減小;
[Abstract]:Because of its excellent span ability, suspension bridge has become a very competitive bridge type in high intensity mountain highway long span bridge. However, the weight and stiffness of the traditional PC suspension bridge tower are both large, and it is easy to damage under the earthquake load, especially the calculation of the shear resistance of the beam is not easy to pass. The PC composite beam with corrugated steel web plate has the advantages of light weight, small stiffness, high shear capacity and small internal force response under earthquake load, which is more suitable for the stress requirement of the tower beam of suspension bridge in high intensity area. However, the seismic behavior of PC composite beams with corrugated steel webs has hardly been studied in the application of suspension bridge tower beams. Therefore, it is necessary to study the stress characteristics of this structure under earthquake load. The research contents and results are as follows: taking a single span steel truss suspension bridge as the engineering background, the effect of longitudinal damper at the connection between stiffened beam and tower is considered. Based on the interaction between pile and soil, the finite element model of suspension bridge is established. Two beams, three beams, four beams, three different beam schemes are drawn up, each of which is divided into two types: PC composite beam with corrugated steel webs and PC box girder. There are six different tower models. Time history analysis method is used to calculate the internal force response of different beam types and the number of beams under earthquake load. In this paper, three beams with optimum internal force response under earthquake load are selected, and the yield moment of the upper, middle and lower beams of the bridge tower is analyzed by using the cross-section seismic analysis software XTRACT. Combined with the internal force response of the tower under different load conditions of the same model, the ultimate bearing capacity and failure process of the PC composite crossbeam tower with corrugated steel webs and the PC box girder bridge tower are compared. By using finite element software ANSYS, six models with different thickness and width / span ratio of roof and bottom plate are established, and the shear lag coefficient of top and bottom plate is calculated. By comparing and analyzing the magnitude and distribution of shear lag coefficient, the influence of geometric structure on shear lag coefficient of PC composite beam with corrugated steel web plate is understood, and the finite element calculation results are checked with the test data of strain gauge in construction site. The results show that under the same earthquake load, the most unfavorable bending moment and shear force of the PC composite beam tower with corrugated steel web are obviously smaller than those of the PC beam tower. With the increase of the number of bridge tower beams, the most unfavorable moment and shear force of the middle beam increase gradually, the most unfavorable moment and shear force of the upper beam gradually decrease. Corrugated steel web PC composite beam tower can increase the initial failure load strength of the tower compared with the common PC beam tower and effectively improve the ultimate seismic bearing capacity of the tower. The larger the thickness of the top and bottom plate of the PC composite beam with corrugated steel web, the more average the shear lag effect curve is. The shear lag coefficient of the lateral web region increases rapidly with the increase of the beam width, and the shear lag coefficient of the inner web region decreases with the increase of the beam width.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U442.55;U448.25

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