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挠度控制是混凝土受弯构件正常使用极限状态设计中的重要内容,已有研究对混凝土受弯构件挠度控制的可靠度水平进行了分析和验证,但所采用的分析方法存在理论上的缺陷,且大多是以个别典型情况为例验证挠度控制的可靠度水平。为准确地揭示混凝土受弯构件挠度控制的可靠度水平,采用无量纲形式系统分析了各种情况下混凝土受弯构件挠度控制的可靠度水平,并分析了主要影响因素。结果表明,GB 50153—2008《工程结构可靠性设计统一标准》对钢筋混凝土受弯构件、不允许出现裂缝的预应力混凝土受弯构件的可靠度控制较为适中,对允许出现裂缝的预应力混凝土受弯构件的控制略显保守,可适当调整。可变作用效应的相对数值对构件挠度控制的可靠度影响显著,且可变作用效应相对越大,挠度控制的可靠度水平越高。
Deflection control is an important part of the design of the limit state of normal bending of concrete flexural members. The reliability of the deflection control of concrete flexural members has been studied and verified. However, there are theoretical defects in the analytical methods Mostly based on a few typical cases, the reliability of deflection control is verified. In order to accurately reveal the reliability of the deflection control of concrete flexural members, the degree of reliability of concrete flexural members under various conditions was analyzed by using dimensionless form system, and the main influencing factors were analyzed. The results show that for GB 50153-2008, “Unified Design Standard for Reliability of Engineering Structure” is more appropriate for the reliability control of prestressed concrete flexural members that do not allow cracks, and for prestressed concrete that allows cracks, Bending member control slightly conservative, may be appropriate adjustments. The relative value of variable effect has a significant effect on the reliability of component deflection control, and the greater the variable effect, the higher the reliability of deflection control.