地铁预应力U形梁非线性数值分析  

Nolinear numeric analysis for prestresed concrete U-shaped beam of subway

作　　者：安亚文[1] 郑七振[1] 张素珍[1] 

机构地区：[1]上海理工大学环境与建筑学院,上海200093

出　　处：《水资源与水工程学报》2014年第1期195-199,共5页Journal of Water Resources and Water Engineering

摘　　要：随着城市轨道交通的迅速发展,预应力混凝土U形梁由于其自身的优点得到了广泛的运用。我国对于U形梁的使用先后出现在了上海地铁6号线,广州地铁2号线以及南京地铁2号线中。但由于U形梁空间受力复杂,还未形成相关的设计依据。本文以实际工程为背景,基于ANSYS有限元软件对U形梁进行了非线性弹塑性分析。对U形梁在不同荷载工况下的挠度,混凝土以及钢筋强度进行了分析。并且对于1.0倍跨中弯矩荷载下的挠度值与实验值进行了对比。最后得到3.37倍跨中弯矩荷载为极限承载能力值,与2.0倍设计荷载值相比偏于安全。通过本文的研究,希望为以后U形梁的设计理论提供依据。With the rapid development of city rail transit,prestressed concrete U-shaped beam has been widely applied because of its own advantages. The U-shaped beam has been applied in shanghai subway line 6,guangzhou subway line 2 and Nanjing subway line 2. However the spatial stress of U-shaped beam is complex,there isn’t relative design criterion in our country. based on actual engineering as a background,the paper usd ANSYS finite element software to analyze the nolinear elastoplastic behavior of Ushaped beam. It also analyzed the deflection strength of reinforce and concrete of U-shaped beam under different load conditions. The value of deflection is compared with experimental value under 1. 0 time span moment load. Finally,3. 37 times span moment load is taken as the ultimate bearing capacity value. Compared with 2. 0 times design load,the value is safer. The result can provide the basis for the design theory of U-shaped beam.

关 键 词：轨道交通 U形梁 ANSYS 非线性 极限承载能力 

分 类 号：TU378[建筑科学—结构工程]