Abstract

Info

Title:: Prestress loss identification of continuous rigid frame bridge based on long term deformation monitoring data

Author(s):: YUAN Zhuo-ya ; SHI Xiong-wei ; MIAO Jian-bao ; XU Bing ; FENG Wei; 1. School of Highway, Changan University, Xi’an 710064, Shaanxi, China; 2. Xi’an Highway Research Institute, Xi’an 710065, Shaanxi, China; 3. China Communications Construction Company Limited Northwest Co. Ltd. Xi’an 710065, Shaanxi, China

Keywords:: bridge engineering; loss identification of prestress; influence matrix; continuous rigid frame; effective prestress

Abstract:: In order to grasp the prestressed state of the existing continuous rigid frame bridge, the new idea of damage assessment of the prestressed state was put forward based on long-term deformation monitoring data. The relationship between long-term deflection and concrete shrinkage creep was established though finite element analysis. Combined with influence matrix, the effective prestress equation based on deflection data identification of health monitoring was established and verified. At the same time, based on statistical analysis of monitoring data, the damages of a continuous rigid frame bridge were identified. The results show that compared with the completed bridge state, the average loss of roof effective prestress was 0.61% and the average loss of bottom plate effective prestress was 0.33%. The structure was in good condition. This can be used as reference for the identification of prestressed loss of similar continuous rigid frame bridge.