超高性能混凝土组合箱梁弯曲性能有限元分析

Finite Element Analysis of Ultra High Performance Concrete Composite Box Girder

摘要:

采用有限元方法对4种超高性能混凝土（UHPC）混凝土组合箱形截面简支梁（全截面C60、顶板替代为UHPC、底板替代为UHPC、全截面UHPC）的弯曲性能进行研究.分析前，为验证ANSYS软件对UHPC材料模型模拟的准确性，对1根矩形UHPC混凝土组合梁开展试验对比分析.根据对比分析结果确定建模方法，得到4种组合箱梁的应力分布、受力性能，总结了相应类型结构的特点.综合考虑材料性能的利用率、裂缝发展模态、极限承载力和经济性，提出相应的设计建议.

Abstract:

Finite element analysis method was used in the research to check the mechanical characteristic of the 4 kinds of UHPCconcrete composite box girders(C60 concrete total crosssection, only UHPC roof, only UHPC bottoms and UHPC total crosssection). The accuracy of ANSYS analyzing and calculating for complex model should be verified before by using the test and the contrastive analysis of a rectangular UHPCconcrete composite beam. The ANSYS modeling method is determined by the result of comparative analysis in the same time. The stress distribution, bearing performance of 4 kinds of box girder were studied in the research. The structural behavior was summarized. The utilization of material properties, ultimate bearing capacity, strain distribution and economy should be considered, and some design advices were also given in the paper.