关键词: 裂缝控制, 可靠度指标, 蒙特卡洛法, 钢衬钢筋混凝土管道

Abstract: In view of the insufficient research on crack control standard of steel lined reinforced concrete penstocks in hydropower project, a new reliability calculation method is established based on the combination of Monte Carlo method and crack width calculation formula provided in Dong Zhe-ren method. According to the parameters from practical engineer examples and model tests, the reliability indexes of present crack control standard for steel reinforced concrete penstocks in corresponding Chinese codes are calculated, and the main influential factors are analyzed. Finally it is found that the present reliability level of crack control for steel lined reinforced concrete penstocks is a little lower, but still in an allowable range. Meanwhile the crack width limit, protection layer thickness and the effective reinforcement ratio have significant influence on the reliability level of crack control standards.

Key words: crack control, reliability index, Monte Carlo method, steel lined reinforced concrete penstock