无黏结PC空心板桥力学性能试验研究Ⅰ:工作性能  

Research on Mechanical Properties of Unbonded PC Hollow Slab Bridge I:Functionality

作　　者：向宝山 周栓科 李晓斌[2] XIANG Bao-shan;ZHOU Shuan-ke;LI Xiao-bin(Sichuan Expressway Construction&.Development Group Co.Ltd.,Chengdu 610041,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]四川高速公路建设开发集团有限公司,成都市610041 [2]西南交通大学土木工程学院,成都市610031

出　　处：《公路》2025年第4期129-134,共6页Highway

摘　　要：某无黏结预应力混凝土(PC)空心板桥已经运营20余年,出现了老化并伴随铰缝脱落、开裂和麻面露筋等各类病害,这给该桥后期运营带来了安全隐患。为了研究该桥的整体受力状态,评价结构的工作性能,在桥址原位开展静载试验和动载试验。试验结果表明,桥体横向传力性能不足,各板之间受力不协调,直接接触车辆的空心板受载量更高;空心板老化受损后,强度和刚度均出现了退化,桥体跨中截面在有障碍和无障碍行车中测得的冲击系数也都超过理论值,动力响应放大效应显著。An unbonded prestressed concrete(PC)hollow-slab bridge that has exceeded 20 years in service has exhibited signs of aging,including joint detachment,cracking,and exposed reinforcement due to pitting corrosion.These conditions have raised potential safety concerns for the bridge's operation.To investigate the bridge's overall stress state and to evaluate the structural performance,static and dynamic load tests are conducted on-site.The results indicated inadequate lateral load transfer and inharmonious stress between the slabs,with those in direct contact with vehicles experiencing increased loading.The aging and damage to the hollow slabs have resulted in the degradation of both strength and stiffness.Furthermore,the impact coefficients measured at the mid-span section of the bridge under both obstacle-free and obstructed traffic conditions aref of und to exceed theoretical values,indicating a significant amplification of dynamic response.

关 键 词：桥梁工程 空心板桥 无黏结预应力混凝土 老化受损 工作性能 横向传力 动力响应放大效应 

分 类 号：U445.71[建筑科学—桥梁与隧道工程] U441.5[交通运输工程—道路与铁道工程]