弯剪共同作用下钢筋混凝土梁承载力计算方法的研究  

RESEARCH OF CALCULATED METHOD OF BEARING CAPACITY FOR REINFORCED CONCRETE MEMBER UNDER SHEAR AND BENDING

作　　者：黄靓[1] 徐紫鹏[1] 鲁懿虬[1] 

机构地区：[1]湖南大学土木工程学院,长沙410082

出　　处：《工程力学》2012年第12期302-306,共5页Engineering Mechanics

基　　金：国家985工程项目(521805020003);国家自然科学基金项目(51078132);教育部创新团队(IRT0917)

摘　　要：国内外大量实验现象表明,钢筋混凝土梁在受到弯矩和剪力共同作用的情况下,其抗弯承载力和抗剪承载力具有相关性。GB50010-2002《混凝土结构设计规范》(以下简称"规范")关于梁的设计方法并未考虑两者的相关性。分析表明:在弯剪共同作用下,按《规范》设计的钢筋混凝土梁的可靠指标不能满足GB50068-2001《建筑结构可靠度设计统一标准》的要求。通过对现有试验数据进行分析,该文提出了基于四分之一圆弧模型的建议修正公式和相应的计算方法。修正公式能很好的体现梁抗弯承载力和抗剪承载力之间的相关性,具有明确的物理意义。对修正公式和《规范》公式进行配筋计算和可靠度分析,结果表明:考虑弯剪相关性的修正公式相比《规范》公式,计算模式准确,可靠指标接近《统一标准》的要求。The experiment of reinforced concrete （RC） beams under a combined action of shear and bending indicated that there is a Moment-Shear correlation. The capacity of RC shear-bending components is calculated separately according to the methods of pure shear and bending in GB50010-2002, which will cause low reliability and the demand of GB50068-2001 cannot be satisfied through analysis of existing test data, a modified formula based on 1/4 arc and its calculation method is proposed. The correlation of shear and bending actions is considered in this formula, which have a definite physical meaning. Results show that the computing model of the modified formula is more accurate and its reliability can meet approximately the demand of GB50068-2001.

关 键 词：钢筋混凝土梁 受弯承载力 受剪承载力 相关性 可靠度 计算方法 

分 类 号：TU375[建筑科学—结构工程]