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为研究拱肋核心混凝土时效与施工过程共同作用所引起的屈曲前变形对钢管混凝土桁式拱肋稳定承载力的影响,建立四肢桁式钢管混凝土拱桥单拱肋的有限元模型,同时考虑时效作用与施工过程,对其出平面稳定承载力进行分析.采用UMAT对ABAQUS进行二次开发,以考虑时效作用影响及施工过程中加载龄期的变化.在此基础上,考虑长细比、含钢率等参数的影响,对四肢桁式钢管混凝土拱的出平面徐变稳定承载力进行参数分析.分析表明,兼顾施工过程影响后,在本文分析参数范围内,时效作用可使四肢桁式钢管混凝土拱的出平面稳定承载力最多降低22.5%,该影响随着长细比的增大、含钢率的降低及持荷等级的提高而增大,在设计中应予以考虑.
In order to study the effect of pre-buckling deformation on the stability bearing capacity of CFST arch ribs caused by the interaction between the aging of the rib core concrete and the construction process, a finite element model of single-arch rib of CFST arch bridge with four limbs is established, taking into account the aging effect And the construction process, the stability of its plane bearing capacity is analyzed.Using the UMAT ABAQUS secondary development, in order to consider the effect of aging effect and the loading process of the construction period changes.On this basis, consider the slenderness ratio, steel Rate and other parameters of the four-legged CFST arch arched stability analysis of the parameters of the plane.The analysis shows that taking into account the impact of the construction process, the parameters in the analysis of this article, the effect of aging can make four limbs CFST Arch stability of the plane out of the maximum capacity reduction of 22.5%, the effect of slenderness ratio increases, the reduction of steel content and load level increases and should be considered in the design.