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对GB50010-2002《混凝土结构设计规范》(以下简称“规范”)剪扭构件承载力计算公式以及黄靓建议的公式进行了可靠度对比分析。结果表明,对于安全等级为二级的剪扭构件,当发生脆性的剪型破坏时,规范公式的受剪可靠指标和受扭可靠指标均值分别为3.23和3.25,不能满足GB50068-2001《建筑结构可靠度设计统一标准》(以下简称《统一标准》)3.7的要求;当发生延性的扭型破坏时,规范公式的受剪可靠指标和受扭可靠指标分别为4.02和2.88,亦不能满足3.2的可靠指标要求;随着扭剪比的变化,规范公式的可靠指标变化幅度较大,受扭和受剪可靠指标之间相差较大,出现不平衡现象。黄靓建议的公式的可靠指标比规范公式高,对于两种破坏类型,可靠指标都在3.6附近,并克服了规范公式可靠指标不平衡的缺点,但对于剪型破坏亦不满足《统一标准》3.7的可靠指标要求。对此,该文把黄靓等人的直线模型再次缩进,提出钢筋混凝土剪扭构件修正公式并作了可靠度分析,结果表明该文修正公式的可靠指标均值在3.75附近,能满足《统一标准》的要求。
The comparative analysis of the reliability of GB50010-2002 Concrete Structure Design Code (hereinafter referred to as “Code”) shear bearing member bearing capacity formula and Huang Liang suggested formula. The results show that for the shear-torsion members with two-level safety grade, the average of the scored shear strength index and the torsion reliability index of the standard formula is 3.23 and 3.25, respectively, when brittle shear failure occurs, which can not meet the requirements of GB50068-2001 “Building Structure Reliability unified design standard ”(hereinafter referred to as the“ uniform standard ”) 3.7 requirements; when the ductile torsional damage occurs, the standard formula of the shear-resistant index and torsional reliability index were 4.02 and 2.88, respectively, can not meet the 3.2 With the change of twist-shear ratio, the reliable index of the canonical formula changes greatly, and the difference between the reliable index of torsion and shearing is larger, and the imbalance phenomenon appears. The reliability index of the formula proposed by Huang Liang is higher than that of the standard formula. For both types of damage, the reliability index is around 3.6, and the shortcoming of the imbalance of the reliable index of the standard formula is overcome. However, the scissors type destruction does not satisfy the “unified standard” 3.7 reliable indicator requirements. In this paper, Huang Liang et al. Reclassified a straight-line model and proposed a modified formula for shear-torsion members of reinforced concrete. The reliability analysis results show that the mean value of the reliable index of the revised formula is around 3.75, Standard "requirement.