可靠度分析既有鋼筋混凝土結構物之損傷情況

• Main Author: 洪漢昌
• Other Authors: 梁明德
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/06941546973558079963

碩士 === 國立海洋大學 === 河海工程學系 === 91 === The main objective of this article is to study the damage state prediction of existing reinforced concrete (RC) structures using structural system failure probability. Firstly, the Gang-xi viaduct in Keelung, Taiwan, is used as a case study. Based on the experimental results through the samples obtained from viaduct, the failure probability of every damage model such as carbonation, chloride ion content, concrete compressive strength and concrete cracks is calculated according to every damage model. An approximate method of structural system reliability analysis is used to predict the failure probability of the whole structure. The predicted result is compared with that result calculated by the wide reliability bounds method. Secondly, the existing RC Bei-huo thermopower plant is employed as another case study. The experimental results are based upon the specimens cored from the plant. The failure probability of every damage model such as carbonation, chloride ion content, concrete compressive strength, and corrosion current of steel in concrete is estimated. The failure probability of the plant system is calculated by quick numerical integration method. The assessed result is compared with that result obtained from the narrow reliability bounds method. The present study shows: (1) Both the approximate method of structural system reliability and the quick numerical integration method analyzed the failure probability for existing RC structures are feasible and reliable. (2) The system failure probability of the existing RC structure is major influenced by the maximum failure probability of damage model. The larger the failure probability of damage model, the greater the influence is.