摘要
石家庄与济南客运专线济南黄河公路和铁路两用特大型桥为公铁两用桥,其采用刚性悬索加劲弦钢桁梁的结构形式和钢桁梁带加劲弦顶推滑移施工技术。选取该桥施工中受力最大的典型节点进行现场应力试验。对节点可能出现较大应力的区域布置应力传感器,现场监测节点在不利施工工况下的应力,并将试验结果与有限元分析结果进行对比。试验分析结果表明,在千斤顶起顶过程中,由于实际起顶位置与原定起顶位置存在一定偏差,以及三片桁架并不完全同步起顶等施工原因,从而导致在千斤顶起顶工况下某些节点局部区域应力水平短时间内较高,在最不利施工工况下,试验节点的测点最大实测应力值达329MPa,接近材料的屈服强度330MPa,节点整体应力状态满足结构强度要求。
In this paper,the stress distributions of the key joints in the most unfavourable case during construction were analysed for the highway-railway combined bridge across the Yellow river between Shijiazhuang and Jinan.The pushing sliding technology was firstly used for the construction of the huge continuous steel truss bridge with rigid suspension cable stiffening chords in China.Firstly,the typical joints subjected to the maximum reactive force during the bridge construction were selected to conduct the mechanical testing on site.The stress sensors were arranged in some positions of the joints,at which the finite element analysis had predicted larger stresses.Then,the stress values were measured by the resistance strain gauge,and the test results were compared with the finite element analysis results.Due to the deviation between the actual lifting position and the planned lifting position,as well as the synchronization issue of the three-truss lifting,the local stress level of some joints is relatively high in a short period.In the most unfavourable case,the maximum measured stress reachs 329 MPa,which is close to the yield strength of 330 MPa.According to the test results,under the most unfavourable condition,the stress of the key joints can meet the structural strength requirement.
作者
李兆峰
牛忠荣
丁仕洪
方继
王利亚
LI Zhaofeng;NIU Zhongrong;DING Shihong;FANG Ji;WANG Liya(School of Civil Kngineering,Hefei University of Technology,Hefei 230009,China;Steel Structure Engineering Co.,Ltd.of CTCE Group 4,Hefei 230022,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2020年第2期182-190,共9页
Journal of Building Structures
基金
国家自然科学基金项目(11272111)
关键词
连续钢桁梁
顶推滑移
整体式节点
现场试验
强度
continuous steel truss bridge
pushing sliding
integral joint
field test
strength
作者简介
李兆峰,出生于1988年,男,工学博士,主要从事力学分析方法研究。email:lzhaofeng88@163.com;通信作者:牛忠荣,出生于1957年,男,工学博士,教授,主要从事力学分析方法研究。email:niu-zr@hfut.edu.cn。
