具有短钢筋连接件的超薄轻型组合桥面结构抗剪性能初探
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摘要
钢—超薄UHPC轻型组合桥面板中UHPC层太薄难以采用常规剪力连接件,笔者团队提出一种新型短钢筋剪力连接件替代常规连接件。首先对短钢筋连接件静力抗剪性能进行初步研究,研究方法采用常用静力推出试验方法。共设计3组(5个)短钢筋推出试件,其中焊缝长度包含15、20、30 mm。试验结果表明:试件存在2种破坏模式,分别为焊缝剪断和超高性能混凝土局部破坏模式;短钢筋连接件承载力随着焊缝长度增加而提高;短钢筋连接件抗剪承载力比栓钉更高。然后对实验模型采用ABAQUS有限元软件进行仿真分析。其中短钢筋连接件、钢板和超高性能混凝土均采用C3D8R单元,钢筋网采用C3D2桁架单元进行模拟。计算结果与试验值符合较好。在模型与试验相验证的基础上,进行了不同焊缝长和不同短钢筋直径的静力推出试件的有限元参数分析,探明了焊缝长和短钢筋直径对荷载-滑移曲线的影响规律。
In order to substitute traditional shear connectors linking steel deck and UHPC( ultrahigh performance concrete) in Light Composite Deck System,which is composed of orthotropic bridge deck and UHPC thin layer,an innovative application of short rebar connectors was proposed. Firstly,the shear behavior of the short rebar connectors was preliminarily studied through the static push-out tests.Three groups of five push-out Specimen with short rebar connectors were designed,of which the length of the welding was 15,20,and 30 mm,respectively. The static push-out test results indicated that: there are two failure modes in the tests,which are the welding cut and the partial failure of the super high performance concrete; the ultimate shear bearing capacity of connectors increase with the growth of welding length; short rebar connectors in push-out specimens show higher shear bearing capacity than that of studs. Then the experimental model was simulated and analyzed based on the ABAQUS finite element software. The C3 D8 R element was used in the simulation of short rebar connections,steel plate,and UHPC,and the C3 D2 truss element was used to simulate the rebar mesh. The calculation results agree well with experimental values. Based on the verification of the model and the test,finite element analysis of the statically push-out tests with different welding lengths and different short rebar diameters was performed,and the influence of the two on the load-slip curve was ascertained.
In order to substitute traditional shear connectors linking steel deck and UHPC( ultrahigh performance concrete) in Light Composite Deck System,which is composed of orthotropic bridge deck and UHPC thin layer,an innovative application of short rebar connectors was proposed. Firstly,the shear behavior of the short rebar connectors was preliminarily studied through the static push-out tests.Three groups of five push-out Specimen with short rebar connectors were designed,of which the length of the welding was 15,20,and 30 mm,respectively. The static push-out test results indicated that: there are two failure modes in the tests,which are the welding cut and the partial failure of the super high performance concrete; the ultimate shear bearing capacity of connectors increase with the growth of welding length; short rebar connectors in push-out specimens show higher shear bearing capacity than that of studs. Then the experimental model was simulated and analyzed based on the ABAQUS finite element software. The C3 D8 R element was used in the simulation of short rebar connections,steel plate,and UHPC,and the C3 D2 truss element was used to simulate the rebar mesh. The calculation results agree well with experimental values. Based on the verification of the model and the test,finite element analysis of the statically push-out tests with different welding lengths and different short rebar diameters was performed,and the influence of the two on the load-slip curve was ascertained.
引文
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[2]丁楠.超高性能混凝土对轻型组合桥面结构疲劳寿命的影响研究[D].长沙:湖南大学,2014.
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[9] Kim J S,Kwark J,Joh C,et al. Headed Stud Shear Connector for Thin Ultrahigh-performance Concrete Bridge Deck[J]. Journal of Constructional Steel Research,2015,108:23-30.
[10]修洪亮,王景全,李明.基于梁式试验与推出试验的栓钉连接件荷载—滑移关系对比研究[J].钢结构,2017,32(3):28-35.
[11]邵旭东,周环宇,曹君辉.钢—薄层RPC组合桥面结构栓钉的抗剪性能[J].公路交通科技,2013,30(4):34-64.
[12]李嘉,杨波,邵旭东,等.钢桥面—薄层CRRPC组合结构栓钉连接件抗剪疲劳性能研究[J].土木工程学报,2016(6):67-75.
[13]李杰.钢桥面—超薄UHPC—TPO组合铺装抗弯疲劳试验研究[D].长沙:湖南大学,2016.
[14]张哲,邵旭东,李文光,等.超高性能混凝土轴拉性能试验[J].中国公路学报,2015,28(8).
[15]杨剑. CFRP预应力筋超高性能混凝土梁受力性能研究[D].长沙:湖南大学,2007.
[16]张士红,邵旭东,黄细军,等.轻型组合桥面板中小栓钉连接件的静力及疲劳性能[J].公路交通科技,2016,33(11):111-119.
[17]石亦平. ABQUS有限元分析实例详解[M].北京:机械工业出版社,2012.
[2]丁楠.超高性能混凝土对轻型组合桥面结构疲劳寿命的影响研究[D].长沙:湖南大学,2014.
[3]周环宇.钢—活性粉末混凝土(RPC)组合梁界面受剪分析[D].长沙:湖南大学,2013.
[4]吴佳佳.钢-UHPC轻型组合桥梁结构华夫桥面板的基本性能[D].长沙:湖南大学,2016.
[5]邵旭东.钢—超高性能混凝土轻型组合桥梁结构[M].北京:人民交通出版社,2015.
[6]邵旭东,甘屹东,李嘉,等.钢—超薄UHPC组合桥面板界面抗剪焊接构造研究[J].中国公路学报,2018(11):91-101.
[7]丁发兴,倪鸣,龚永智,等.栓钉剪力连接件滑移性能试验研究及受剪承载力计算[J].建筑结构学报,2014,35(9):98-106.
[8]刘翔.钢—预制带肋混凝土叠合板组合梁抗弯性能理论分析[D].济南:山东大学,2017.
[9] Kim J S,Kwark J,Joh C,et al. Headed Stud Shear Connector for Thin Ultrahigh-performance Concrete Bridge Deck[J]. Journal of Constructional Steel Research,2015,108:23-30.
[10]修洪亮,王景全,李明.基于梁式试验与推出试验的栓钉连接件荷载—滑移关系对比研究[J].钢结构,2017,32(3):28-35.
[11]邵旭东,周环宇,曹君辉.钢—薄层RPC组合桥面结构栓钉的抗剪性能[J].公路交通科技,2013,30(4):34-64.
[12]李嘉,杨波,邵旭东,等.钢桥面—薄层CRRPC组合结构栓钉连接件抗剪疲劳性能研究[J].土木工程学报,2016(6):67-75.
[13]李杰.钢桥面—超薄UHPC—TPO组合铺装抗弯疲劳试验研究[D].长沙:湖南大学,2016.
[14]张哲,邵旭东,李文光,等.超高性能混凝土轴拉性能试验[J].中国公路学报,2015,28(8).
[15]杨剑. CFRP预应力筋超高性能混凝土梁受力性能研究[D].长沙:湖南大学,2007.
[16]张士红,邵旭东,黄细军,等.轻型组合桥面板中小栓钉连接件的静力及疲劳性能[J].公路交通科技,2016,33(11):111-119.
[17]石亦平. ABQUS有限元分析实例详解[M].北京:机械工业出版社,2012.
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