Durability and Service Life Prediction of Existing Reinforced Concrete Bridges

• Main Authors: Han-Tung Chang, 張翰東
• Other Authors: Jiang-Jhy Chang
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/45143460529925178186

碩士 === 國立臺灣海洋大學 === 河海工程學系 === 96 === Both the durability problem and service life prediction of reinforced concrete(RC) structures are very important in civil engineering all over the world. The corrosion of RC structures due to chloride ion penetration into concrete is occurred damage in long-term and load-bearing-capacity is not strengthened enough. The main propose of this article is to analyze rust-expansion-cracking life-time and load-bearing-capacity life-time after the corrosion of steel in concrete. The service life of RC structures can be divided into three stages, carbonation or initiation period , depassivation period and corrosion or propagation period . The theoretical models of rust-expansion-cracking and load-bearing-capacity are used to predict the service-life of RC structures by using probability and reliability index. To verify the serviceability of theoretical models, the data of field test of the Shi-yuan viaduct, Wann-fwu bridge, Chorng-ching viaduct were used as illustrative examples. When the reliability index is 1.0, their rust-expansion-cracking life-time and load-bearing-capacity life-time are 58, 33, and 57 years and 78, 147, and 116 years, respectively. The results of this study may be applied to predicting the service life, repair, strengthening, and demolition of RC bridges or structures.