【作者】 杨锋；

【导师】 刘寒冰； 焦明伟；

【作者基本信息】 吉林大学 ， 交通运输工程， 2012， 硕士

【摘要】 斜拉桥是一种组合体系桥梁，其造型美观、气势宏伟，结构跨越能力大、稳定性能好。由于其诸多优点，斜拉桥在过去的50多年间，取得了飞速发展，使其成为跨径200m～800m范围内最有竞争力的桥梁结构形式之一。独塔斜拉桥有着良好的技术性与经济性，是斜拉桥方案成立条件下首先考虑采用的结构形式，在中小跨度桥梁中具有极强的竞争力。本文依托鹤大高速公路小沟岭至抚松段牡丹江红石斜拉桥的设计，详细介绍了桥梁的总体设计与方案比选，利用有限元方法进行了桥梁的静力分析与稳定性分析，根据计算结果验算了桥梁结构强度、刚度。1、根据本桥实际的地形、地貌、水文条件，选择装配式预应力混凝土连续T梁、预应力混凝土连续箱梁桥、中承式钢管混凝土拱桥与独塔单索面混凝土斜拉桥四种桥型进行经济技术比选，综合各方面因素，斜拉桥优势明显，本桥推荐采用斜拉桥方案。2、研究斜拉桥方案总体布设控制因素，选定斜拉桥塔、梁、墩的总体布置方案，拟定总体设计参数及各细部尺寸。本桥方案最终为独塔单索面混凝土斜拉桥，跨径2×165m等跨对称布置，单柱式桥塔、主梁采用单箱五室混凝土箱梁，结构体系为塔、墩、梁固结体系。3、利用有限元方法将结构离散为平面杆系模型，进行桥梁静力分析与稳定性分析。通过计算与分析，桥梁承载能力验算、抗裂性验算、持久状况和短暂状况的应力验算、结构刚度等结果均完全满足现行桥梁规范的要求。其中持久状况主梁正应力是设计中的控制因素，结构的进一步优化与跨度的增大应从提高主梁抗压强度与减轻主梁自重两方面采取措施。4、根据桥梁结构第一类稳定分析结果，桥梁的一阶失稳模态为主塔的平面外屈曲，最不利工况为施工中最大双悬臂状态，结构的最小稳定安全系数为13.971，结构的失稳概率较小。本文的分析计算结果可为设计提供依据，也可供相近桥梁设计参考。更多还原

【Abstract】 Cable-stayed bridge is a kind of combination system bridge, it’s modelling is beautifuland magnificent. The structure have great spanning capacity and good stability. Because ofit’s many advantages, cable-stayed bridge has made rapid development in the past50years,to make it became one of the most competitive bridge structure in range of span200m~800m. Single tower cable-stayed bridge with good technical and economic performance, isthe first consider structural form under the conditions of cable-stayed bridge project wasestablished, is extremely competitive in the medium and small span bridge.This paper relies on the Mudanjiang Hongshi Cable-stayed Bridge design of the HeDahighway Xiaogouling to Fusong segment, detailing the overall design and scheme selection,using the finite element method for bridge static analysis and the stability analysis, checkingthe bridge structural strength and stiffness according to the calculation result in design.1、According to the bridge actual topography, geomorphology, hydrology condition,selecting assembly of continuous prestressed concrete T beam, prestressed concretecontinuous box girder bridge, half-through concrete filled steel tubular arch bridge andsingle tower cable-stayed bridge with single cable plane four kinds bridge to take economicand technical comparison and selection. The cable-stayed bridge project have obviouslyadvantage in various factors, this bridge is recommend for the cable-stayed bridge.2、Study of cable-stayed bridge project overall arrangement of control factors, selectedtower, girder, pier general layout scheme, to make overall design parameters and the size ofthe details. The bridge program finally for single tower and single cable plane cable-stayedconcrete bridge, span2x165m cross symmetry layout, single-pole bridge tower, girder ofsingle box five compartment concrete box girder, structural system for pier tower girderconsolidation system. 3、By using finite element method, the structure is divided into the plane frame model,to take static analysis and stability analysis of bridge. Through calculation and analysis, thebridge bearing capacity, crack resistance checking calculation, stress calculation of persistentsituation and transient status, structure stiffness results are fully meet the current bridgespecifications. The lasting condition of normal stress in the main girder is the controllingfactors of design, structure is optimized further and the increase of span should improve thecompressive strength and reduce the weight of main girder.4、According to the first class stability analysis results of the bridge structure, the firstorder buckling mode is mainly tower out-of-plane buckling, the most unfavorable conditionsfor the construction of the longest double cantilever structure. The minimum safety factor is13.971, the structure instability probability is very low.In this paper, the analysis and calculation results can provide a basis for the bridgedesign, also can be similar bridge design reference.更多还原