摘要
嘉绍跨海大桥北副航道桥为(70+120+120+70)m预应力混凝土连续刚构结构,该桥上部结构采用挂篮双悬臂浇筑法施工。结合该桥箱梁截面宽、节段重等特点,悬臂施工挂篮采用菱形挂篮,菱形挂篮由主桁架、底模平台及吊挂系统、内(外)模吊挂及走行系统、后锚固、内(外)模、施顶系统等组成,挂篮重约86.7t。在挂篮设计过程,分析菱形挂篮各构件的传力机理,采用MI-DAS 2010有限元软件建立挂篮有限元模型,分析了最不利工况下挂篮各构件的受力和变形情况,并进行了挂篮抗倾覆计算,结果均满足规范要求。
The north auxiliary shipping channel bridge of the Jiashao Sea-Crossing Bridge is a prestressed concrete continuous rigid-frame structure with span arrangement （70 ＋ 120 ＋ 120 ＋ 70） m and the superstructure of the bridge was constructed by the form travelers by the two-side cantilever casting method. In the light of the characteristics that the box girder of the bridge was wide and a segment of the girder was heavy, the form travelers to be used for the cantilever con-struction were designed as the diamond-shape travelers, of which a traveler, weighing about 86.7 t, was made up of the main truss, bottom form platform and its suspending system, suspending and traveling systems of the internal and external forms, rear anchorage, internal and external forms and jacking system. In the design of the form travelers, the load transferring mechanism of different components of the travelers was analyzed, the software MIDAS 2010 was used to build up the finite element model for the travelers, the forces and deformation of the components under the worst load case were analyzed and the overturning resistance of the travelers was calculated. The results of the analysis and calculation proved that all components of the travelers could satis-fy the relevant requirements in the codes.
出处
《桥梁建设》
EI
CSCD
北大核心
2013年第2期116-120,共5页
Bridge Construction
关键词
连续刚构
箱形梁
挂篮
设计
有限元法
continuous rigid-frame structure
box girder
form traveler
design
finite ele-ment method
作者简介
赵金祥1970-，男，高级工程师1992年毕业于长沙铁道学院铁道工程专业，工学学士。研究方向：桥梁E-mail：zjx999@126．com
