Life-Cycle Bearing Capacity for Pre-Stressed T-beams Based on Full-Scale Destructive Test  

作　　者：Yushan Ye Tao Gao Liankun Wang Junjie Ma Yingchun Cai Heng Liu Xiaoge Liu 

机构地区：[1]China Construction Seventh Engineering Division Corp.,Ltd.,Zhengzhou,450004,China [2]School of Water Conservancy and Transportation,Zhengzhou University,Zhengzhou,450001,China

出　　处：《Structural Durability & Health Monitoring》2025年第1期145-166,共22页结构耐久性与健康监测（英文）

摘　　要：To investigate the evolution of load-bearing characteristics of pre-stressed beams throughout their service life and to provide a basis for accurately assessing the actual working state of damaged pre-stressed concrete T-beams,destructive tests were conducted on full-scale pre-stressed concrete beams.Based on the measurement and ana-lysis of beam deflection,strain,and crack development under various loading levels during the research tests,combined with the verification coefficient indicators specified in the codes,the verification coefficients of bridges at different stages of damage can be examined.The results indicate that the T-beams experience complete,incom-plete linear,and non-linear stages during the destructive test process.In the complete linear elastic stage,both the deflection and bottom strain verification coefficients comply with the specifications,indicating a good structural load-bearing capacity no longer adheres to the code’s requirements.In the non-linear stage,both coefficients exhi-bit a sharp increase,resulting in a further decrease in the structure’s load-bearing capacity.According to the pro-visions of the current code,the beam can be in the incomplete linear stage when both values fall within the code’s specified range.The strain verification coefficient sourced from the compression zone at the bottom of theflange is not recommended for assessing the bridge’s load-bearing capacity.

关 键 词：Pre-stressed T-beams whole process destructive test bearing capacity verification coefficient 

分 类 号：U45[建筑科学—桥梁与隧道工程]