【作者】 艾永明；

【导师】 杨炳成；

【作者基本信息】 长安大学 ， 桥梁与隧道工程， 2007， 硕士

【摘要】 斜拉拱桥是一种新型的组合桥梁结构形式,它结合了斜拉桥与拱桥的优点,不但造型美观,而且结构受力合理。斜拉拱桥由于拉索的作用,增加了结构整体刚度,使斜拉拱桥的跨度相比一般拱桥有了很大提高,使得斜拉拱桥的横向稳定问题更加突出。论文首先在圆弧拱侧倾临界荷载的经典理论基础上,采用能量法,推导了索—拱结构侧倾临界荷载的计算公式,发现由于拉索作用而大大提高了拱的横向稳定性。其次,在给定简化的基础上,推导了下承式圆弧线双肋斜拉拱桥横向稳定临界荷载的实用计算方法,得出了在保向力和非保向力作用下,斜拉拱桥横向稳定临界荷载与各个结构参数变化的关系,掌握了各结构参数对结构横向稳定性的影响程度。最后,为了弥补解析法中位移函数假设上的缺陷所造成的计算偏差,应用空间有限元程序进行数值分析,分别就拉索索力及布置形式、拱轴线形、矢跨比、边界条件、拱肋刚度及内倾角、宽跨比、横撑刚度及布置形式、桥面系刚度及联结形式等结构参数对斜拉拱横向稳定性的影响进行了系统的分析,并给出了这些参数的取值建议。此外,基于工程实际,阐述了斜拉拱在大跨度拱桥施工中的应用。更多还原

【Abstract】 The cable-stayed arch bridge is a kind of new composite bridge structure form with mechanics reasonability and aesthetics appearance, which combines the merits of the cable-stayed bridge and the arch bridge harmoniously. The cables on the cable-stayed arch bridge increase the whole inflexibility of the structure, which raises the spans compared with common arch bridges as to make outstanding to lateral stability.In this thesis, firstly, based on the classical theories of the lateral critical load of the segmental arch, with energy method, an analytical solution for the lateral critical load of the cable-stayed arch bridge is studied, thinking cables improve the lateral stability of the arch greatly. Secondly, on the basis of some simplifications, the practical method for calculating the lateral stability critical load of through segmental double-ribs cable-stayed arch bridge is derived, the relation between the lateral stability critical load, under the conservative loads and the non-orientated conservative loads, and the varies of structure parameters is achieved. The results which can understand the degrees of influence coming from the structure parameters on the lateral stability of the cable-stayed arch bridge are of certain guidance to the practical application. At last, in order to remedy the limitation of the assumed displacement function producing result deviation, using large finite element software ANSYS to do numerical stimulation on the structure parameters such as the force and the arrangement form of stayed cables,the arch axial linetypes of the arch ribs, rise-to-span ratio, boundary condition, the stiffness and the sloping angle of the arch ribs, the stiffness and arrangement form of the lateral brace, width to span ratio, the stiffness and connection form of bridge decks, etc, and putting forward a rationalization value-taking suggestion.In addition, on account of the practical engineering, introduce the applying of the cable-stayed arch bridge in construction.更多还原