摘要
为了解不同钢筋连接形式下混凝土桥面板湿接缝的抗弯性能,以某高速公路连续梁桥为背景进行研究。设计制作带湿接缝的桥面板试件(1组直钢筋焊接试件、1组直钢筋搭接试件、5组环形钢筋搭接试件),通过纯弯试验研究其裂缝发展、破坏形态、开裂荷载、破坏荷载及混凝土与钢筋应变的变化规律。结果表明:新旧混凝土结合面最先开裂,是整个试件的薄弱面,设计中应加强;不同钢筋连接方式试件的破坏荷载从大到小依次为环形钢筋搭接>直钢筋搭接>直钢筋焊接;环形钢筋搭接试件的承载力随着搭接长度的增加逐渐增加;对于两端有水平约束的桥面板结构,在临界破坏状态时呈现板结构+膜结构的两体系受力状态。
To compare the flexural behavior of wet joint of concrete bridge deck with different steel bar connections, the research was conducted based on a continuous girder bridge in highway. A series of bridge deck specimens (1 set of specimens with welded straight steel bar, 1 set of specimens with lapped straight steel bar, and 5sets of specimens with lapped ring steel bar) were designed and prepared to perform pure bending tests so as to study the cracking development, failure mode, cracking load, failure load, and change law of strain of concrete and steel bar. The results show that the new-old concrete interface, as a weak site of entire specimen, cracks firstly, thus should be strengthened in design. The failure load of specimens with different steel bar connections varies significantly, and is sequentially in following order: the specimens with lapped ring steel bar > specimens with lapped straight steel bar > specimens with welded straight steel bar. In addition, the loading capacity of the specimen will increase as the lapped length of ring steel bar increases. For concrete bridge deck with horizontal restrains at both ends, two internal forces of slab and membrane structures will occur in a critical failure state.
作者
申雁鹏
郭文龙
韩之江
樊天望
SHEN Yan-peng;GUO Wen-long;HAN Zhi-jiang;FAN Tian-wang(Shanxi Transportation Research Institute,Taiyuan 030006,China;Shanxi Key Laboratory of Disaster Prevention and Mitigation of Bridge Engineering,Taiyuan 030006,China;Nanchang Urban Planning & Design Institute,Nanchang 330038,China)
出处
《桥梁建设》
EI
CSCD
北大核心
2019年第3期34-39,共6页
Bridge Construction
基金
国家自然科学基金项目(51708384)
山西省交通科技计划项目(2017-1-22)
山西省应用基础研究项目(201801D221216)~~
关键词
混凝土结构
桥面板
湿接缝
钢筋连接
纯弯破坏
抗弯承载力
模型试验
concrete structure
bridge deck
wet joint
steel bar connection
bending failure
flexural capacity
model test
作者简介
申雁鹏,1984-,男,高级工程师,2007年毕业于南阳理工学院结构工程专业,工学学士,2010年毕业于重庆交通大学结构工程专业,工学硕士。研究方向:大跨度桥梁健康监测,混凝土桥梁火损测试与评估,E-mail:289502715@qq.com;郭文龙,1982-,男,高级工程师,2008年毕业于长安大学道路桥梁与渡河工程专业,工学学士,2011年毕业于长安大学桥梁与隧道工程专业,工学硕士。研究方向:桥梁结构力学行为,E-mail:392594485@qq.com;韩之江,1968-,男,教授级高工,1996年毕业于西安公路交通大学交通土建工程专业,工学学士。研究方向:桥梁结构设计与检测,E-mail:sxjk-qls@163.com;樊天望,1990-,男,助理工程师,2014年毕业于同济大学建筑与土木工程专业,工学学士,2017年毕业于同济大学建筑与土木工程专业,工学硕士。研究方向:桥梁结构设计,E-mail:1070377313@qq.com
