某T形刚构桥体外预应力加固效果评价

发布时间：2018-04-15 10:20

本文选题：T形刚构桥 + 体外预应力　；参考：《中外公路》2015年04期

【摘要】：该文对某T形刚构桥体外预应力加固效果进行评价分析,首先依据桥梁竣工图纸建立有限元计算模型,分析研究桥梁结构在各类荷载组合作用下的应力与变形;然后根据加固设计方案,对比分析T构施加体外预应力前后的正应力、主应力、变形及强度验算。计算表明:体外预应力加固技术能有效增大T构截面的应力储备,控制T构悬臂端变形;加固后T构的静载试验结果表明实测桥梁刚度大于理论计算值,实测悬臂段挠度小于理论计算值;长期健康监测结果表明桥面标高稳定,牛腿处下挠趋势减缓,桥面线形较平顺;理论分析、静载试验和长期监测结果验证了体外预应力加固技术的可行性与有效性。
[Abstract]:In this paper, the external prestressing reinforcement effect of a T-shaped rigid frame bridge is evaluated and analyzed. Firstly, the finite element calculation model is established according to the completed drawing of the bridge, and the stress and deformation of the bridge structure under various load combinations are analyzed and studied.Then according to the reinforcement design, the normal stress, principal stress, deformation and strength of T structure before and after external prestressing are compared and analyzed.The calculation results show that the external prestressing reinforcement technique can effectively increase the stress reserve of T-section and control the deformation of T-structure cantilever end, and the static load test results show that the measured bridge stiffness is larger than the theoretical calculated value.The measured deflection of the cantilever section is less than the theoretical calculation value, the long-term health monitoring results show that the elevation of the bridge deck is stable, the downward deflection trend of the corbel leg is slowed down, and the line shape of the bridge deck is relatively smooth.The results of static load test and long-term monitoring verify the feasibility and effectiveness of external prestressing reinforcement technology.
【作者单位】：华南理工大学土木与交通学院;华南理工大学亚热带建筑科学国家重点实验室;广东省公路勘察规划设计研究院股份有限公司;
【基金】：广东省公路管理局科技项目(编号:粤公研2009-14) 华南理工大学亚热带建筑科学国家重点实验室开放研究项目(编号:2011KB14)
【分类号】：U445.72

【参考文献】