铰缝损伤对装配式空心板桥受力性能影响研究  

Influence of Hinge Joint Damage on the Structural Performance of Precast Hollow Slab Bridge

作　　者：刘旭政[1,2] 郭维 吴刚 荆伟伟[3] Liu Xuzheng;Guo Wei;Wu Gang;Jing Weiwei(School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China;National Experimental Teaching Demonstration Center of Civil Engineering,East China Jiaotorg University,Nanchang 330013,China;Jiashan Transportation Bureau,Jiaxing 314100,China)

机构地区：[1]华东交通大学土木建筑工程学院,江西南昌330013 [2]华东交通大学土木工程国家实验教学示范中心,江西南昌330013 [3]嘉善县交通运输局,浙江嘉兴314100

出　　处：《华东交通大学学报》2021年第3期23-30,共8页Journal of East China Jiaotong University

基　　金：国家自然科学基金(52068026,51468019);浙江省交通运输厅科技计划项目(2021034)。

摘　　要：在役装配式空心板桥横向联系受设计、施工及运营各因素的影响,易出现铰缝损伤病害。为研究铰缝损伤对空心板桥结构性能的影响,论文根据现场空心板桥铰缝病害调研结果对铰缝损伤位置、损伤长度和损伤程度3种损伤类型分布特点进行统计分析;采用梁格法建立空心板桥有限元模型,对比分析了铰缝在不同损伤工况及类型下(长度、深度和位置)对结构受力性能影响。研究结果表明:①铰缝损伤位置越靠近跨中对于梁板受力的影响越大。②随着铰缝损伤长度增加,中板单侧损伤下活载弯矩增幅呈线性递增,而边板单侧损伤和中板双侧损伤均会导致梁板产生“单板受力”效应,其“单板受力”临界长度分别为0.6L和0.7L。③损伤长度或损伤深度二者之一较小时,活载作用下梁板弯矩和挠度变化很小;当损伤长度和损伤深度均较大时,活载作用下的梁板弯矩和挠度增幅明显。④20 m标准空心板的中板单板受力时抗弯承载能力不满足规范要求,边板单板受力时抗弯承载能力和抗裂验算不满足规范要求。研究结果为空心板铰缝损伤下的结构安全评估及管养提供有益参考。The horizontal connections of the existing precast hollow slab bridges are prone to hinge joint damage due to the design,construction,and operation environment.To study the influence of hinge damage on the structural performance,the statistical analysis on three damage types,including damage position,length,and extent,was studied based on the field inspection results of hinge damage of precast hollow slab bridges.Using the grillage method,a series of finite element models of precast hollow slab bridges were established to study and analyze the influence on the structural performance with various damage conditions.The research results show that:①The closer the damage position is to the middle span,the greater the influence on structural forces.②With the increment of damage length,the bending moments of the middle slab increase linearly with the unilateral hinge damage condition under live load.The side slab with unilateral hinge damage and middle slab with bilateral hinge damage will result in the single slab bearing,and the critical damage length is 0.6L and 0.7L respectively.③The change of slab’s moment and deflection is small when the damage length or depth is small under live load.And the bending moment and deflection increase greatly under live load when the damage length and depth are both large.④Under the single slab bearing condition,the bending bearing capacity of the middle slab of standard 20 m length does not meet the code requirements,and neither the bending bearing capacity nor the crack check meets the code requirements.The research results can give useful suggestions for the safety assessment and maintenance of precast hollow slab bridges with hinge joints damage.

关 键 词：装配式空心板桥 铰缝病害 梁格模型 单板受力 结构验算 

分 类 号：U443[建筑科学—桥梁与隧道工程]