Finite Element Analysis of Damaged and FRP-repaired PC Piles for Landing Stage Structures using OpenSees Software

• Main Authors: Hung-Ru Chen, 陳泓儒
• Other Authors: 鄭全桓
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/20691019776657728128

碩士 === 國立暨南國際大學 === 土木工程學系 === 96 === Corrosion and deterioration of concrete piles are common problems for wharf structures. Wave impacts, cyclic wetting and drying due to tidal action, and high concentration of chlorine ions result in accelerated deterioration of marine concrete piles. Retrofit schemes for corroded marine concrete piles are similar to those for reinforced concrete (RC) columns. Among the popular retrofit methods, FRP jacketing has been attracting intensive interests in research as well as in practical application. Despite the rapid development of research and application of FRP jacketing for RC column retrofit, study on FRP jacketing for marine concrete piles is rare. As the corrosion condition facing marine piles is much different from that for RC columns, the effectiveness of the retrofit technique for corroded marine piles needs to be re-examined. A case of corrosion of prestressed concrete (PC) piles supporting landing stage structures in a harbor of Taiwan was investigated. A series of 7 reduce-scaled PC pile specimens simulating the corroded and the FRP-repaired PC piles were tested to investigate the lateral load-carrying behavior of the PC piles for the landing stage structures. The present thesis presents the analytical study on the experiments. The forced-based finite fiber element (FFE) model that has been built in the OpenSees software framework is employed. Each specimen is modeled by a forced-based FFE, which consists of 8 controlled cross sections. Each of the controlled sections is sub-divided into a number of fibers that represent the stress-strain behavior of the constituent materials, concrete or reinforcing steel, of the cross section. Two models for stirrup-confined concrete and three models for FRP-confined concrete are used and evaluated to model the uniaxial stress-strain behavior of concrete. By using OpenSees cyclic static analyses of the force-based FFE are conducted to analytically simulate the cyclic tests of the pile specimens. The analytical results are compared with the experimental curves to validate the analytical models.