下承式钢管混凝土刚架系杆拱桥抗震性能研究与优化
发布时间：2018-07-20 19:34
【摘要】：近年来,钢管混凝土拱桥由于承载能力高、施工速度快、经济美观等特点在我国得到了飞速的发展。钢管混凝土拱桥设计规范颁布不久,规范指导下的桥梁设计抗震性能未知,因此有必要研究钢管混凝土拱桥设计参数对其抗震性能的影响,并通过优化设计参数来提高钢管混凝土拱桥的抗震性能。本文首先利用ANSYS程序建立了某下承式钢管混凝土刚架系杆拱桥的三维有限元模型,以此为基础,通过控制变量法对矢跨比、拱肋内倾角、含钢率、横撑布置数量和墩柱刚度等设计参数分别进行调整,建立相应的三维有限元模型,对比分析其自振特性和对地震响应的敏感性。其次,根据钢管混凝土刚架系杆拱桥纵向一阶面内反对称弯曲基本振型周期关于拱墩线刚度比的关系曲线,将其拟合成二次多项式,估算出初步设计中的自振频率。拟合结果表明适当降低墩柱刚度可大幅度提高拱肋纵向面内弯曲振型的自振周期,减小地震响应。再次,基于多指标决策的离差最大化法,编制了可供设计人员计算评价抗震设计方案的MATLAB程序,对抗震设计参数方案进行客观排序,以期达到最优化抗震性能的目的。数值计算结果表明修改矢跨比和内倾角对结构的抗震性能均有明显改善;评价设计参数时,下部结构的地震响应指标权重系数较大,拱脚和墩柱处的内力变化较大,需要重点关注墩底和拱脚截面的内力,加强局部设计。最后对钢管混凝土拱桥设计规范中抗震设计参数的取值提出了一些建议。
[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.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U448.22;U442.55
[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.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U448.22;U442.55
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