为了明确组合梁中支点处钢梁与混凝土桥面板分离对大跨度恒载组合梁桥受力性能的影响,结合一实际工程,采用板壳-实体有限元方法,分析了中支点处桥面板与钢梁分离及完全结合情况下组合梁受力性能的区别,以及分离段长度变化对整体结构和中支点附近板件受力的影响。研究结果表明：在中支点附近一定范围设立分离段对组合梁整体刚度影响较小,但能减弱该处钢-混间连接刚度,有效减小中支点处混凝土上表面拉应力,进而减缓该处混凝土的开裂问题。对于60 m跨的组合梁,支点处钢-混分离段长度宜设为单跨跨径的11%左右。
Abstract
In order to clarify the influence of the separation of the steel beam and the concrete bridge deck at the middle fulcrum on the mechanical performance of a long-span dead load composite beam bridge, a practical project is analyzed and studied using the shell-solid finite element method. The mechanical performance differences of the composite beam under conditions of separation and complete connection of the bridge deck and the steel beam at the middle fulcrum are examined. Additionally, the influence of changes in the length of the separation section on the overall structure and the stress of the plate near the middle fulcrum is analyzed. The results show that setting a separation section within a certain range near the middle fulcrum has little effect on the overall stiffness of the composite beam. However, it can reduce the stiffness of the steel-concrete connection, effectively decrease the tensile stress on the upper surface of the concrete at the middle fulcrum, and thus alleviate the cracking problem of the concrete. For a 60m span composite beam, the length of the steel-concrete separation section at the fulcrum should be set to about 11% of the single span.
关键词
桥梁工程 /
组合结构 /
桥面连续 /
连接件 /
受力性能 /
合理范围
{{custom_keyword}} /
Key words
bridge engineering /
composite structure /
link-slabs /
connectors /
mechanical performance /
reasonable range
{{custom_keyword}} /
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 刘玉擎. 组合结构桥梁[M].北京:人民交通出版社,2005.
LIU Yuqing.Composite bridges[M].Beijing:China Communications Press,2005.(in Chinese)
[2] 项海帆. 高等桥梁结构理论[M].北京:人民交通出版社,2013.
XIANG Haifan.Theory of higher bridge structure[M].Beijing:China Communications Press,2013.(in Chinese)
[3] 郭瑞,苏庆田,李晨翔,等.后结合预应力组合梁负弯矩区混凝土开裂性能试验[J].同济大学学报(自然科学版),2015,43(3):352-356.
GUO Rui,SU Qingtian,LI Chenxiang,et al.Experimental studies on cracking behavior of post-combined prestressed concrete slab in hogging zone of composite Gider[J].Journal of Tongji University(Natural Science),2015,43(3):352-356.(in Chinese)
[4] 余志武,郭风琪.部分预应力钢-混凝土连续组合梁负弯矩区裂缝宽度试验研究[J].建筑结构学报,2004,25(4):55-59.
YU Zhiwu,GUO Fengqi.Experimental study of crack width in negative bending region of partially prestressed continuous steel-concrete composite beam[J].Journal of Building Structures,2004,25(4):55-59.(in Chinese)
[5] 聂建国,陶慕轩,聂鑫,等.抗拔不抗剪连接新技术及其应用[J].土木工程学报,2015,48(4):7-14,58.
NIE Jianguo,TAO Muxuan,NIE Xin,et al.New technology and application of uplift-restricted and slip-permitted connection[J].China Civil Engineering Journal,2015,48(4):7-14,58.(in Chinese)
[6] 曹沛. 部分结合预应力连续组合梁受力分析[D].上海:同济大学,2017.
CAO Pei.Force analysis of partially prestressed continuous composite beam[D].Shanghai:Tongji University,2017.(in Chinese)
[7] 吕沛文,苏庆田,吴飞,等.部分结合连续组合梁受力分析[J].结构工程师,2019,35(2):66-74.
LÜ Peiwen,SU Qingtian,WU Fei,et al.Analysis of partical-combination continuous composite beam[J].Structural Engineers,2019,35(2):66-74.(in Chinese)
[8] 杨敏捷. 新型连接件在轨道交通组合梁负弯矩区的应用[J].铁道建筑技术,2020,328(8):120-124.
YANG Minjie.Application of new connectors in the negative bending moment zone of rail transit composite beams[J].Railway Construction Technology,2020,328(8):120-124.(in Chinese)
[9] 邵旭东,周银东,曹君辉,等.钢简支梁的新型桥面连续结构抗弯性能试验研究[J].土木工程学报,2019,52(12):80-92.
SHAO Xudong,ZHOU Yindong,CAO Junhui,et al.Experimantal study on flexural behavior of novel continuous deck structure in steel simply-supported beams[J].China Civil Engineering Journal,2019,52(12):80-92.(in Chinese)
[10] 马宝亮,杨展鹏,黎越华,等.带抗拔不抗剪栓钉的钢-混组合梁桥面连续构造理论研究[J].甘肃科学学报,2021,33(4):112-119.
MA Baoliang,YANG Zhanpeng,LI Yuehua,et al.Theoretical study on link slabs of steel-concrete composite beam bridges with uplift-restricted and slip-permitted studs[J].Journal of Gansu Sciences,2021,33(4):112-119.(in Chinese)
[11] 陈松,陈真,郭骞,等.型钢-混凝土组合梁桥面连续的抗裂性能研究[J].公路,2021,66(12):116-122.
CHEN Song,CHEN Zhen,GUO Qian,et al.Study on crack resistance of continuous steel-concrete composite beam bridge deck[J].Highway,2021,66(12):116-122.(in Chinese)
[12] 中华人民共和国交通运输部.公路桥涵设计通用规范:JTG D60—2015[S].北京:人民交通出版社,2015.
Ministry of Transport of the People's Republic of China.General Specifications for Design of Highway Bridge Culverts JTG D60—2015[S].Beijing:China Communication Press,2015.(in Chinese)
[13] 中华人民共和国交通运输部.公路钢筋混凝土及预应力钢筋混凝土桥涵设计规范:JTG 3362—2018[S].北京:人民交通出版社,2018.
Ministry of Transport of the People's Republic of China.Specifications for Design of Highway Reinforced Concrete and Prestressed Concrete Bridge and Culverts:JTG D60—2015[S].Beijing:China Communication Press,2018. (in Chinese)
[14] 戴昌源,苏庆田.钢-混凝土组合桥面板负弯矩区裂缝宽度计算[J].同济大学学报(自然科学版),2017,45(6):806-813.
DAI Changyuan,SU Qingtian.Crack width calculation method of fiber reinforced concrete composite bridge deck[J].Journal of Tongji University(Natural Science),2017,45(6):806-813.(in Chinese)
{{custom_fnGroup.title_cn}}
脚注
{{custom_fn.content}}
PDF(2059 KB)
