型钢-混凝土组合加固装配式空心板梁桥铰缝破坏模式及工作性能研究
|
摘要
为解决装配式空心板梁桥铰缝失效而产生单板受力难题,采用型钢-混凝土组合加固(顶板加固法)装配式空心板梁桥铰缝,以浙江省高速公路某13m装配式空心板梁桥为背景,对加固后铰缝破坏模式及工作性能进行研究。采用有限元软件分别建立铰缝局部(试件)有限元模型和空心板梁整体有限元模型,分析破坏状态下铰缝试件的应力特性和裂缝发展情况,计算跨中偏载作用下空心板梁的挠度特性、应力特性以及荷载横向分布系数变化规律。结果表明:型钢-混凝土组合加固能改变铰缝的传力方式,加固后铰缝破坏模式由弯剪破坏变为弯曲破坏;型钢-混凝土组合加固能显著改善铰缝的工作性能,提高空心板梁桥的承载能力以及加载刚度,促进多片板梁的协调变形,有效减小加载区域板梁与邻近板梁的荷载横向分布系数差异,避免出现单板受力;加固后的装配式空心板梁桥荷载横向分布系数理论计算建议采用刚接板梁法。
The failure of hinge joints in assembled hollow slab bridge will lead to the load bearing condition in which loads are carried by single slabs.To study the failure mode and working performance of hinge joints strengthened by combined use of section steel and concrete,a 13 m long assembled hollow slab bridge on an expressway in Zhejiang Province was taken as the study background.The finite element software was used to establish the local model of the hinge joint(specimen)and the overall model of the hollow slab bridge,to check the stress property of the hinge joint specimen and the propagation of cracks under the damaged condition as well as the property of deflection and stress and the variation law of the transverse distribution coefficient of loads in the hollow slab bridge under the mid-span eccentric loading condition.The results show that using section steel and concrete to strengthen the hinge joints can change the way of force transmission,and the failure mode of hinge joints is changed from bending-shearing failure to bending failure after strengthening.The combined use of steel section and concrete to strengthen hinge joints can markedly ameliorate the working performance of the hinge joints,improve the load bearing capacity and load applying stiffness of the hollow slab bridge,promote the coordinated deformation of multiple slabs,effectively reduce the difference between the load transverse distribution coefficients of slabs in the load applying area and the adjacent slabs,and avoid dumping loads to single slabs.It is suggested to use the rigid-connected slab method to the theoretical calculation of the load transverse distribution coefficient of assembled hollow slab bridge after strengthening.
The failure of hinge joints in assembled hollow slab bridge will lead to the load bearing condition in which loads are carried by single slabs.To study the failure mode and working performance of hinge joints strengthened by combined use of section steel and concrete,a 13 m long assembled hollow slab bridge on an expressway in Zhejiang Province was taken as the study background.The finite element software was used to establish the local model of the hinge joint(specimen)and the overall model of the hollow slab bridge,to check the stress property of the hinge joint specimen and the propagation of cracks under the damaged condition as well as the property of deflection and stress and the variation law of the transverse distribution coefficient of loads in the hollow slab bridge under the mid-span eccentric loading condition.The results show that using section steel and concrete to strengthen the hinge joints can change the way of force transmission,and the failure mode of hinge joints is changed from bending-shearing failure to bending failure after strengthening.The combined use of steel section and concrete to strengthen hinge joints can markedly ameliorate the working performance of the hinge joints,improve the load bearing capacity and load applying stiffness of the hollow slab bridge,promote the coordinated deformation of multiple slabs,effectively reduce the difference between the load transverse distribution coefficients of slabs in the load applying area and the adjacent slabs,and avoid dumping loads to single slabs.It is suggested to use the rigid-connected slab method to the theoretical calculation of the load transverse distribution coefficient of assembled hollow slab bridge after strengthening.
引文
[1]金辉,徐岳,郑求才,等.型钢-混凝土组合加固技术在空心板桥中的应用[J].桥梁建设,2017,47(1):114-118.
[2]陈淮,张云娜.施加横向预应力加固装配式空心板桥研究[J].公路交通科技,2008,25(10):58-62.
[3]李宏江,赵尚传,李万恒,等.既有装配式梁桥横向连接构造评价技术进展[J].中外公路,2014,34(2):124-128.
[4]王银辉,罗征,周怀治,等.型钢-混凝土组合加固装配式板梁桥铰缝试验[J].中国公路学报,2015,28(9):38-45.
[5]叶见曙,刘九生,俞博,等.空心板混凝土铰缝抗剪性能试验研究[J].公路交通科技,2013,30(6):33-39.
[6]赵秋,陈美忠,陈孔生.开孔钢板铰缝连接构造推出试验与数值模拟[J].沈阳建筑大学学报(自然科学版),2017,33(4):596-605.
[7]项贻强,邢骋,邵林海,等.铰接预应力混凝土空心板梁桥的空间受力行为及加固分析[J].东南大学学报(自然科学版),2012,42(4):734-738.
[8]于天来,李海生,赵云鹏,等.装配式铰接板桥的铰缝损伤评价[J].桥梁建设,2016,46(4):51-54.
[9]韩保勤.单板受力桥梁铰缝注胶加固法及效果评价指标[J].世界桥梁,2015,43(4):84-87.
[10]李胜利,石鸿帅,毋光明,等.声发射技术在混凝土空心板桥裂缝检测中的应用[J].桥梁建设,2017,47(5):83-88.
[11]陈悦驰,吴庆雄,陈宝春.装配式空心板桥铰缝破坏模式有限元分析[J].工程力学,2014,31(S1):51-58.
[2]陈淮,张云娜.施加横向预应力加固装配式空心板桥研究[J].公路交通科技,2008,25(10):58-62.
[3]李宏江,赵尚传,李万恒,等.既有装配式梁桥横向连接构造评价技术进展[J].中外公路,2014,34(2):124-128.
[4]王银辉,罗征,周怀治,等.型钢-混凝土组合加固装配式板梁桥铰缝试验[J].中国公路学报,2015,28(9):38-45.
[5]叶见曙,刘九生,俞博,等.空心板混凝土铰缝抗剪性能试验研究[J].公路交通科技,2013,30(6):33-39.
[6]赵秋,陈美忠,陈孔生.开孔钢板铰缝连接构造推出试验与数值模拟[J].沈阳建筑大学学报(自然科学版),2017,33(4):596-605.
[7]项贻强,邢骋,邵林海,等.铰接预应力混凝土空心板梁桥的空间受力行为及加固分析[J].东南大学学报(自然科学版),2012,42(4):734-738.
[8]于天来,李海生,赵云鹏,等.装配式铰接板桥的铰缝损伤评价[J].桥梁建设,2016,46(4):51-54.
[9]韩保勤.单板受力桥梁铰缝注胶加固法及效果评价指标[J].世界桥梁,2015,43(4):84-87.
[10]李胜利,石鸿帅,毋光明,等.声发射技术在混凝土空心板桥裂缝检测中的应用[J].桥梁建设,2017,47(5):83-88.
[11]陈悦驰,吴庆雄,陈宝春.装配式空心板桥铰缝破坏模式有限元分析[J].工程力学,2014,31(S1):51-58.