摘要
由于预应力束施工定位与设计存在偏差,有效预应力不足,导致部分大跨度预应力混凝土桥主梁跨中出现不同程度下挠,且桥梁下挠在整个服役期内不稳定。为分析定位偏差对有效应力的影响,提出以竖弯为主、平弯为辅的空间预应力束数字模型解译方法,编写基于数据库和插值函数驱动的大跨度桥梁任意断面预应力束定位服务程序。结果表明:大跨度桥梁预应力束定位角度偏差增加1°,预应力损失增量增加10.9%;通过研究解译方法得到的预应力束曲线与模型曲线吻合良好,提取的定位数据满足施工要求。研究成果在昌景黄(南昌—景德镇—黄山)铁路等多个铁路桥梁建设中得到应用。
Due to deviations in the positioning and design of prestressed tendons during construction,insufficient effective prestressing has resulted in varying degrees of deflection in the mid-span of some long-span prestressed concrete bridges,and the deflection is unstable throughout the entire service life of the bridge.To analyze the impact of positioning deviation on effective stress,a digital model interpretation method for spatial prestressed tendons with vertical bending as the main method and horizontal bending as the auxiliary method was proposed.A database and interpolation function driven program for prestressed tendon positioning service of long-span bridges at any section was developed.The results show that the deviation of the positioning angle of prestressed tendons in long-span bridges increases by 1°,and the increment of prestressed loss increases by 10.9%.The prestressed tendon curve obtained through the study of interpretation methods is in good agreement with the model curve,and the extracted positioning data meets the construction requirements.The research results have been applied to the construction of many railway bridges such as the Changjinghuang(Nanchang-Jingdezhen-Huangshan)railway.
作者
苗永抗
宋树峰
MIAO Yongkang;SONG Shufeng(China Railway Design Corporation,Tianjin 300308,China)
出处
《铁道建筑》
北大核心
2023年第11期6-10,共5页
Railway Engineering
基金
中国科协第五届青年人才托举项目(2019QNRC001)
中国国家铁路集团有限公司科技研究开发计划(K2022G009)。
关键词
铁路桥梁
预应力束定位
模型解译
语言编程
施工应用
railway bridge
pre-stress position
model interpretation
language programming
construction application
