摘要
为了消除铰缝病害对装配式空心板桥的不利影响,提出了一种采用浅铰缝的横向预应力装配式空心板桥方案。通过对一跨跨径13 m的空心板桥足尺模型的试验和非线性有限元分析,研究荷载作用下的桥梁受力性能。试验结果表明,浅铰缝结合面法向黏结强度为弱侧混凝土轴心抗拉强度的40%;结合面的切向黏结强度为弱侧混凝土轴心抗压强度的1.1%。试验过程中铰缝和新旧混凝土结合面保持完好,空心板先于铰缝破坏失效。采用浅铰缝的横向预应力装配式空心板桥的破坏模式为空心板破坏,铰缝不再是空心板桥受力的薄弱环节。有限元计算结果表明,横向预应力大大减小了铰缝结合面的法向拉应力。空心板桥的浅铰缝结合面发生的是剪切破坏而不是弯拉破坏。参数分析结果表明,施加横向预应力时,预应力不宜小于预应力钢筋强度标准值的45%。
In order to eliminate the adverse effect of shear key disease on prefabricated voided slab bridges,scheme for an transverse prestressed voided slab bridge with partial-depth shear key is proposed.The full scale model experiment and nonlinear finite element analysis of a 13 m-span voided slab bridge are carried out to study the mechanical performance of the bridge under load.The test results show that the normal bond strength of the partial-depth shear key junction surface is 40%of the tensile strength of the weak side concrete.The tangential bond strength of the junction surface is 1.1%of the compressive strength of the concrete axis on the weak side.The shear key and the junction surface between old and new concrete remain well during the test,and the failure of the voided slab comes before the shear key.The failure mode of the transverse prestressed prefabricated voided slab bridge with partial-depth shear key is the voided slab failure,and the shear keys are no longer the weak part of the voided slab bridge.The finite element calculation results show that the transverse prestressed greatly reduces the normal tensile stress of the shear key junction surface.Shear failure rather than flexural failure occurs in partial-depth shear key junction surface of voided slab bridges.The results of parameter analysis show that when applying transverse prestressed,the value of the prestressed should not be less than 45%of the standard strength of prestressed reinforcement.
作者
陈茂榕
李学红
曹小龙
陈康明
黄宛昆
CHEN Maorong;LI Xuehong;CAO Xiaolong;CHEN Kangming;HUANG Wankun(Xiamen R&B Baicheng Co.,Ltd.,Xiamen 361009,China;Anhui Kaiyuan Highway and Bridge Co.,Ltd.,Hefei 230088,China;College of Civil Engineering,Fuzhou University,Fuzhou 350108,China)
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2024年第4期703-713,共11页
Journal of Guangxi University（Natural Science Edition）
基金
国家自然科学基金项目(52078137)
福州大学科研启动项目(XRC-23020)。
关键词
装配式空心板桥
浅铰缝
横向预应力
受力性能
足尺模型试验
有限元分析
prefabricated voided slab bridge
partial-depth shear key
transverse prestressed
mechanical performance
full-scale model experiment
finite element analysis
