【摘要】：近年來,鋼管混凝土拱橋由于承載能力高、施工速度快、經(jīng)濟美觀等特點在我國得到了飛速的發(fā)展。鋼管混凝土拱橋設(shè)計規(guī)范頒布不久,規(guī)范指導(dǎo)下的橋梁設(shè)計抗震性能未知,因此有必要研究鋼管混凝土拱橋設(shè)計參數(shù)對其抗震性能的影響,并通過優(yōu)化設(shè)計參數(shù)來提高鋼管混凝土拱橋的抗震性能。本文首先利用ANSYS程序建立了某下承式鋼管混凝土剛架系桿拱橋的三維有限元模型,以此為基礎(chǔ),通過控制變量法對矢跨比、拱肋內(nèi)傾角、含鋼率、橫撐布置數(shù)量和墩柱剛度等設(shè)計參數(shù)分別進行調(diào)整,建立相應(yīng)的三維有限元模型,對比分析其自振特性和對地震響應(yīng)的敏感性。其次,根據(jù)鋼管混凝土剛架系桿拱橋縱向一階面內(nèi)反對稱彎曲基本振型周期關(guān)于拱墩線剛度比的關(guān)系曲線,將其擬合成二次多項式,估算出初步設(shè)計中的自振頻率。擬合結(jié)果表明適當(dāng)降低墩柱剛度可大幅度提高拱肋縱向面內(nèi)彎曲振型的自振周期,減小地震響應(yīng)。再次,基于多指標(biāo)決策的離差最大化法,編制了可供設(shè)計人員計算評價抗震設(shè)計方案的MATLAB程序,對抗震設(shè)計參數(shù)方案進行客觀排序,以期達到最優(yōu)化抗震性能的目的。數(shù)值計算結(jié)果表明修改矢跨比和內(nèi)傾角對結(jié)構(gòu)的抗震性能均有明顯改善;評價設(shè)計參數(shù)時,下部結(jié)構(gòu)的地震響應(yīng)指標(biāo)權(quán)重系數(shù)較大,拱腳和墩柱處的內(nèi)力變化較大,需要重點關(guān)注墩底和拱腳截面的內(nèi)力,加強局部設(shè)計。最后對鋼管混凝土拱橋設(shè)計規(guī)范中抗震設(shè)計參數(shù)的取值提出了一些建議。
[Abstract]:In recent years, concrete filled steel tubular arch bridge has been developed rapidly in China because of its high bearing capacity, fast construction speed and beautiful economy. Shortly after the promulgation of the design code for concrete-filled steel tubular arch bridge, the seismic performance of the bridge under the guidance of the code is unknown, so it is necessary to study the influence of the design parameters of the concrete filled steel tube arch bridge on its seismic performance. The seismic performance of CFST arch bridge is improved by optimizing design parameters. In this paper, a 3D finite element model of a through concrete filled steel tube rigid frame tied arch bridge is established by using ANSYS program. Based on this model, the ratio of rise-span, the inclination of arch rib and the steel content are controlled by variable method. The design parameters such as the number of transverse brace arrangement and the stiffness of pier column were adjusted respectively and the corresponding three-dimensional finite element model was established. The natural vibration characteristics and the sensitivity to earthquake response were compared and analyzed. Secondly, according to the relationship curve between the basic mode period of antisymmetric bending and the ratio of stiffness to stiffness of arch piers in the longitudinal first order plane of concrete-filled steel tubular rigid frame tied arch bridge, the quadratic polynomial is synthesized and the natural vibration frequency in the preliminary design is estimated. The fitting results show that the natural vibration period of longitudinal bending mode can be greatly increased and the seismic response can be reduced by properly reducing the stiffness of pier column. Thirdly, based on the deviation maximization method of multi-index decision-making, a MATLAB program for designers to calculate and evaluate the seismic design scheme is developed, and the objective ranking of seismic design parameters is carried out in order to achieve the purpose of optimizing seismic performance. The results of numerical calculation show that the modified rise-span ratio and the internal inclination can obviously improve the seismic performance of the structure, and when evaluating the design parameters, the weight coefficient of the seismic response index of the substructure is large, and the internal force at the arch foot and pier column changes greatly. Attention should be paid to the internal forces at the bottom of the piers and the arch section, and the local design should be strengthened. Finally, some suggestions on the seismic design parameters of CFST arch bridge design code are put forward.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U448.22;U442.55

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本文編號：2134546