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介绍了体外预应力桥梁的有限元分析方法,基于ANSYS二次开发了体外预应力桥梁有限元分析模块,能够计入材料与几何非线性影响,可用于分析体外预应力结构的极限承载力和局部受力特征。利用开发的模块,建立体外预应力桥梁的有限元模型,利用Solid65结合Solid45单元模拟混凝土,利用Link8模拟预应力束。在此基础上,通过对体内束和体外束的不同比例的配束方案的体外预应力混凝土桥梁力学性能分析,研究配束方案对极限承载能力的影响。分析结果表明,适当配置有粘结预应力对改善体外预应力桥梁的极限承载能力有较大的作用,可增加混凝体塑性变形的范围。因此,可选用适当的体外束和体内束的配合比,以获得更好的力学性能。
The finite element analysis method of external prestressed bridge is introduced. Based on ANSYS, the external prestressed bridge finite element analysis module is developed. It can take into account the influence of material and geometrical nonlinearity. It can be used to analyze the ultimate bearing capacity of external prestressed structure and the local Force characteristics. The finite element model of prestressed external bridge was established by using the developed module. The concrete was simulated by Solid65 combined with Solid45 element, and the prestressed beam was simulated by Link8. Based on this, the influence of the cabling plan on the ultimate bearing capacity was studied by analyzing the mechanical properties of externally prestressed concrete bridges with different proportions of in-vivo and in-vitro beams. The analysis results show that proper pre-bonding with prestressed concrete structures has a great effect on improving the ultimate bearing capacity of external prestressed bridges, and can increase the range of plastic deformation. Therefore, the appropriate combination of in vitro beam and in vivo beam can be chosen to obtain better mechanical properties.