国内外混凝土构件裂缝控制安全度设置水平的比较  

Comparison of safety level of Chinese and foreign crack control of concrete members

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,武汉430072

出　　处：《建筑结构》2011年第2期124-127,共4页Building Structure

基　　金：中央高校基本科研业务费专项资金资助(092)

摘　　要：根据已收集到的国内外混凝土结构设计规范关于裂缝宽度计算公式的有关规定,对裂缝宽度计算公式的保证率及其荷载效应组合等进行了比较,并初步研究了《混凝土结构设计规范》(GB50010—2002)裂缝宽度计算公式的安全度设置水平。提出了以等效保证率作为衡量频遇组合或准永久组合下裂缝宽度计算公式的安全度评判指标的建议。在此基础上,对我国规范GB50010—2002的裂缝宽度计算公式提出了两点修订建议:将裂缝宽度公式的计算保证率由95%降为82%,相应的受弯构件受力特征系数由2.1降为1.7;除吊车荷载外,其他构件可考虑采用频遇组合代替标准组合进行裂缝宽度计算。According to the crack-width formula in Chinese and foreign concrete structure design codes,the calculation guarantee rate of flexural crack-width formula,load combination etc.,were compared,and the safety level of flexural crack-width formula in GB50010—2002 was preliminarily studied.A new concept named equivalent guarantee rate was created as an index to evaluate the safety level of flexural crack-width calculation under frequent combination and quasi-permanent combination.Two revised suggestions about flexural crack-width formula in GB50010—2002 were presented： the calculation guarantee rate of flexural crack-width formula should be lowered from 95% to 82%,correspondingly the value of characteristic coefficient in flexural crack-width formula should be lowered from 2.1 to 1.7;except crane beams,the flexural crack-width should be calculated under frequent combination in place of characteristic combination.

关 键 词：混凝土构件 裂缝宽度 等效保证率 频遇组合 准永久组合 

分 类 号：TU375.02[建筑科学—结构工程]