中外混凝土规范裂缝控制标准的可靠度分析与比较  

Comparison analysis of reliability of crack control criteria for Chinese and foreign concrete design specifications

作　　者：李扬[1] 侯建国[1] 

机构地区：[1]武汉大学土木建筑工程学院,湖北武汉430072

出　　处：《中南大学学报（自然科学版）》2013年第9期3786-3792,共7页Journal of Central South University:Science and Technology

基　　金：中央高校基本科研业务费专项资金资助项目(20102100101000092)

摘　　要：通过引入模糊示性函数的蒙特卡洛方法,对我国规范GB 50010—2002,GB 50010—2010以及欧洲规范EN1992-1-1:2004和美国规范ACI 318—08裂缝控制标准基于耐久性要求的模糊可靠指标βw进行计算分析和比较。分析结果表明:与GB 50010—2002规范中的βw相比,GB 50010—2010规范中的βw在潮湿大气环境下和氯离子侵蚀环境下均下降50%;与EN 1992-1-1:2004规范中的βw相比,GB 50010—2010规范中的βw在潮湿大气环境下和氯离子侵蚀环境下分别偏高305%和146%;与ACI 318—08规范中的βw在潮湿大气环境下和氯离子侵蚀环境下相比,GB 50010—2010规范中的βw分别偏高462%和55%。从合理的安全度设置水平角度出发,建议针对GB 50010—2010规范,可将普通潮湿大气环境下的裂缝宽度限值从当前的0.2 mm提高至0.25 mm,或将裂缝宽度计算保证率从当前的95%降为90%。The fuzzy reliability indexes based on durability of concrete crack control criteria for both damp air environment and chloride environment given by GB 50010—2002,GB 50010—2010,EN 1992-1-1:2004 and ACI 318— 08 were calculated and compared by applying the Monte Carlo method with fuzzy indicator function.The calculation results indicate that for damp air environment and chloride environment,the reliability indexes of GB 50010—2010 are 50% lower than that of GB 50010—2002;For damp air environment and chloride environment,the reliability indexes of GB 50010—2010 are respectively 305% and 146% higher than that of EN 1992-1-1:2004,as well as 462% and 55% higher than that of ACI 318—08.Considering the rational safety level,the crack width limit should be increased from present 0.2 mm to 0.25 mm or the crack width calculation guarantee rate should be lowered from present 95% to 90% for crack control criteria given by GB 50010—2010 for damp air environment.

关 键 词：混凝土裂缝控制 可靠度指标 安全度设置水平 保证率 裂缝宽度限值 

分 类 号：TU375.1[建筑科学—结构工程]