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组合梁相较于一般截面梁具有吊装重量轻、布置灵活、自重较轻等优势。混凝土组合梁因其具有良好的经济性常用于吊装困难的大跨桥梁的上部结构。因构成组合梁所使用材料的性能有所不同,收缩徐变差造成的影响不可忽略。本文阐述了一种分析在组合结构中考虑收缩徐变影响的方法,即利用显式数值积分格式将收缩徐变的影响在数值计算的每一个增量步中分别计算。本文利用ABAQUS通用有限元程序进行组合梁收缩徐变效应的模拟,结果表明,收缩徐变对组合梁受拉区混凝土和钢筋的应力影响较大,而受压区混凝土受其影响相对较小。
Compared with the general cross-section beam beam has the advantages of light weight, flexible layout, light weight and other advantages. Because of its good economy, concrete composite beams are commonly used in the superstructure of large-span bridges with difficult lifting. Due to the different properties of the materials used to form the composite beam, the effects of shrinkage and creep should not be neglected. In this paper, a method of analyzing the effect of shrinkage and creep in a composite structure is described. The effect of shrinkage and creep is calculated separately in each increment step of numerical calculation by using the explicit numerical integration scheme. In this paper, the general finite element program of ABAQUS is used to simulate the shrinkage and creep effect of composite beams. The results show that the shrinkage and creep have a greater influence on the stress of concrete and steel bars in the tension zone of the composite beam, while the concrete in compression zone is relatively less affected.