A study on the failure probability of the code for the concrete strength acceptance

• Main Authors: Yen-Lin Huang, 黃彥霖
• Other Authors: Jen-rong Lee
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/01327336587003853773

碩士 === 國立高雄第一科技大學 === 營建工程研究所 === 102 === This study was intended to find out the changes in the overall structure properties when a reinforced concrete structure is subject to the influence of concrete strength. Monte Carlo method was introduced to simulate structure strength models of various acceptance strengths with compliance with acceptance criteria specified in structural concrete construction code and the probability of the critical cross-sectional strength smaller than design strength. The distribution of structure properties specified in standards was obtained. The possible range of influence for the reduced concrete acceptance strength was estimated using cross section stress analysis. Then the probability of critical cross-sectional strength smaller than design strength was multiplied by the percentage of the range under influence to the cross-sectional area of structure member to determine possibility of structure system failure due to reduced acceptance strength of concrete. The result indicated significant changes in overall structure properties as the structure was vulnerable to compromised construction control level when the acceptance strength of concrete was lower than design strength. The critical configuration in this study was based on the concrete structural design code and structural concrete construction code. However, the simulation result suggested that the strength at the critical cross section was smaller than design strength by more than 29 %. This indicates that there may still be many changes even with the acceptance procedure conforming to the code. Sensitivity analysis was performed on the variables that might have influence on structure. It was found that the compressive strength of concrete had little influence on structure, whereas the influence of variables related to reinforcement bars was significant on structure. Therefore, more consideration may be required for factors influencing reinforcement bars when conducting RC structure design.