体外索加固开裂预应力混凝土连续箱梁桥的效果分析  

Analysis of the Effect of External Cable Reinforcement on Cracked Prestressed Concrete Continuous Box Beam Bridges

作　　者：陈叶 CHEN Ye

机构地区：[1]福建省建筑科学研究院有限责任公司、福建省绿色建筑技术重点实验室,福建福州350108

出　　处：《福建建设科技》2023年第5期91-94,共4页Fujian Construction Science & Technology

摘　　要：通过在箱梁内部施加体外索的方法,对跨中底板带有横向裂缝的变截面预应力混凝土箱梁桥进行加固,对比分析了施加预应力时及加固前后两次荷载试验桥梁关键断面的裂缝、挠度及应变的实测值与理论计算值之间的关系,结果表明体外预应力的方法能够有效地约束跨中底板横向裂缝的发展,可以用于跨中底板横向裂缝加固。By applying external cables inside the box girder,a variable cross-section prestressed concrete box girder bridge with transverse cracks in the mid span bottom plate was reinforced.The relationship between the measured values of cracks,deflection,and strain of the key section of the bridge during the application of prestress and the two load tests before and after reinforcement and the theoretical calculation values was coMPared and analyzed.The results showed that the external prestress reinforcement method can effectively constrain the development of transverse cracks in the mid span bottom plate,It can be used for reinforcing transverse cracks in the mid span bottom plate.

关 键 词：体外索 加固 连续箱梁桥 底板横向裂缝 

分 类 号：U445.72[建筑科学—桥梁与隧道工程]