建筑结构学报2024，Vol.45Issue(1)：192-201,10.DOI:10.14006/j.jzjgxb.2022.0750
长度30m先张预应力混凝土组合工字梁受弯性能足尺试验研究
Full-scale experiment research on flexural behaviour of 30 m pre-tensioning prestressed concrete composite Ⅰ-girder
摘要
Abstract
To investigate the flexural behavior of pre-tensioning prestressed concrete composite Ⅰ-girder,two full-scale 30 m models were designed,one was a single Ⅰ-girder and the other was a composite Ⅰ-girder with a concrete deck.Then,static bending loading tests were performed.The friction loss of prestressed,load versus deflection relationship,failure modes,crack distribution and crack width were investigated during the tests.The applicability of the design methods of JTG 3362-2018,GB 50010-2010,ACI 318-14 and Eurocode 2 specification were discussed based on the experimental result.The results show that the frictional forces are developed in the tensioning of the draped strands when the 16Mn plate-type bend device is used,and the friction coefficient is about 0.25.After combing the concrete deck,the cracking load,reinforcement yield load and flexural ultimate load of the Ⅰ-girder are increased by 23.8％,11.6％and 11.2％respectively,and the stiffness and ductility are also improved.The flexural load capacity of normal section of the composite Ⅰ-girder can be safely designed using four specifications mentioned above.JTG 3362-2018,Eurocode 2 and GB 50010-2010 are conservative in calculating the cracking moment,and can accurately calculate the maximum crack width,pre-cracking stiffness and post-cracking stiffness of the composite I-girder,respectively.关键词
桥梁工程/混凝土工字梁/先张法/足尺模型/静力试验/受弯性能Key words
bridge engineering/concrete Ⅰ-girder/pre-tensioning method/full-scale model/static test/flexural behavior分类
建筑与水利引用本文复制引用
封博文,刘永健,杨俊宇,闫新凯..长度30m先张预应力混凝土组合工字梁受弯性能足尺试验研究[J].建筑结构学报,2024,45(1):192-201,10.基金项目
陕西省交通运输厅科研项目(15-24K),中央高校基本科研业务专项(300102219310). （15-24K）
