劲性骨架混凝土拱桥施工阶段的非线性稳定分析

论述了钢管混凝土作为劲性骨架施工的钢筋混凝土拱桥的行为特点,此类桥的结构在施工过程中,历经三种状态①劲性骨架状态,②劲性骨架的一部分杆件被混凝土包裹的状态,③钢筋混凝土拱业已形成之后的成桥状态.用荷载增量法并考虑几何非线性和材料非线性影响以及施工加载历程,建立了3种计算模型,对用劲性骨架法施工的跨度为313m的拱桥各施工阶段稳定性进行了分析研究.指出了各种计算模型的适用范围.

NON-LINEAR STABILITY ANALYSIS OF CONCRETE ARCH BRIDGE WITH STIFF SKELETON OF CONCRETE-FILLED STEEL TUBES DURING CONSTRUCTION

This paper discusses the construction charateristics of a reinforced concrete areh bridge with stiff skeleton of concretefilled steel tubes. The structural features of the arch bridger go through three stages during construction: 1 ) stiff skeleton composed of concrete-filled steel tubes, 2) some members of the stiff skeleton being covered with concrete, 3) concrete arch completed . With the use of load incremental method, in consideration of the effects of geometrical and material non-linearity and the various loading during construction, be computation models are proposed to analyze the stability for every construction stage of a conrete arch bridge with stiff reinforcement, its span being 313m. The adaptable ranges of the different proposed computation models are also presented.