考虑使用状态应力的铁路40 m跨度预应力混凝土简支箱梁的碳化寿命预测  

Prediction of Carbonation Service Life for 40 m Span Railway Prestressed Concrete Simply Supported Box Girders Considering Stress in Service State

作　　者：李杰[1] 蔺鹏臻[2] LI Jie;LIN Pengzheng(Key Laboratory of Road&Bridge and Underground Engineering of Gansu Province,Lanzhou Jiaotong University,Lanzhou 730070,China;School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学甘肃省道路桥梁与地下工程重点实验室,兰州730070 [2]兰州交通大学土木工程学院,兰州730070

出　　处：《铁道建筑》2021年第1期47-50,共4页Railway Engineering

基　　金：国家自然科学基金(11790281,51878323);中国铁路总公司科技研究开发计划(2017G010-C)。

摘　　要：在已有随机碳化模型基础上引入修正工作应力影响系数,运用碳化寿命准则和可靠度指标方法,给出了长期恒载应力状态下混凝土结构碳化寿命预测方法,并利用该方法对浩吉(浩勒报吉—吉安)铁路一桥梁的40 m跨度预应力混凝土简支箱梁进行了碳化寿命预测。结果表明,在一般大气环境中该简支箱梁碳化寿命由顶板1/4跨截面控制,预测结果为112年,与桥梁的耐久性设计基准期100年接近,满足耐久性要求。该预测方法比较合理。Based on the existing random carbonation model,the modified working stress influence coefficient was introduced,and the carbonation life criterion and reliability index method were used to predict the carbonation life of concrete structure under long-term dead load stress.The carbonation life of a 40 m span prestressed concrete simply supported box girder bridge on Haolebaoji-Ji’an railway was predicted by using this method.The results show that in general atmospheric environment,the carbonation life of the simply supported box girder is controlled by 1/4 cross section of the roof,and the prediction result is 112 years,which is close to the durability design reference period of 100 years and meets the durability requirements.The prediction method is reasonable.

关 键 词：铁路桥梁 碳化寿命 理论分析 可靠度 箱梁 耐久性 修正工作应力影响系数 

分 类 号：U448.13[建筑科学—桥梁与隧道工程]