独塔混合梁斜拉桥成桥状态的影响参数分析

Analysis of Impacting Parameters about Finished Dead State of Hybrid Girder Cable-stayed Bridge with Single Tower

关键词:  斜拉桥  混合梁  成桥状态  结构自重  临时荷载  结构刚度  收缩徐变

Key words:  cable-stayed bridge  hybrid girder  finished dead state  dead-weight of structure  temporary load  structural stiffness  creep and shrinkage

摘要:

以广州东沙大桥独塔边跨带辅助墩的混合梁双索面斜拉桥为例,采用对比分析的方法,定量分析结构自重、临时荷载、结构刚度、混凝土收缩徐变这些因素对混合梁斜拉桥成桥状态的影响。得知主梁结构自重、施工临时荷载、混凝土收缩徐变对桥的索力、主梁挠度、主梁应力影响较大,其中临时荷载的影响尤为明显,而结构刚度的影响较小。在建桥施工过程中应对这些参数进行严格管理和控制,要准确模拟,修正在施工过程中各种影响成桥目标的参数偏差对成桥目标的影响,确保成桥后结构受力和线型满足设计要求。

Abstract:

This paper take Dongsha Bridge of side span with subsidiary piers which is hybrid girder cable stayed bridge with single tower and double cable planes project in Guangzhou as the background.The influences of dead weight of structure, temporary load, structural stiffness, creep and shrinkage in concrete effect on finished dead state of hybrid girder cable-stayed bridge were analysed.We can see that the dead weight of main beam, temporary load, creep and shrinkage in concrete have greater effect in the cable force, main beam deflection, the main beam stress, the impact of temporary load is particularly evident.But the structural rigidity has less effect.Construction of the bridge in the course of these parameters should carry out stringent management and control.In order to meet the design reguirements, it is a necessity to simulate and to correct the parameter error in the construction process.