混凝土受弯构件裂缝控制的可靠度分析

Reliability analysis on crack control of concrete flexural members

裂缝控制是混凝土构件正常使用极限状态设计中的重要内容,我国对混凝土构件裂缝控制的可靠度水平进行分析和验证,但这些工作采用的分析方法存在理论上的缺陷,且多数是以个别典型情况为例验证裂缝控制的可靠度水平,结论并不全面。为全面、准确地揭示我国混凝土构件裂缝控制的可靠度水平,以混凝土受弯构件为研究对象,采用无量纲的形式系统分析了各种情况下我国混凝土构件裂缝控制的可靠度水平,并分析了主要的影响因素。结果表明:我国目前对三级钢筋混凝土受弯构件可靠度水平的控制较为适中,对其他构件可靠度水平的控制偏于保守。

Crack control is an important item in serviceability limit state design of concrete members. Some reliability analyses on crack control of concrete members have been conducted, but the method taken in these jobs is unreasonable in theory, and the results based on individual special case are not comprehensive enough. In order to comprehensively and accurately reveal the reliability level of crack control of concrete members in our country, the concrete flexural members are used to analyze the reliability under different by the dimensionless form, and the major influence factors are concluded. The result shows that it is appropriate for reliability control of third Grade-3 reinforced concrete flexural members, but conservative for reliability control of other members at present.