钢筋混凝土无腹筋梁受剪承载力计算模型误差分析

发布时间：2018-01-13 15:06

本文关键词：钢筋混凝土无腹筋梁受剪承载力计算模型误差分析　出处：《建筑结构学报》2014年09期 　论文类型：期刊论文

【摘要】：为提高钢筋混凝土无腹筋梁受剪承载力计算的准确性,收集国内外743根矩形截面无腹筋简支梁的剪切试验数据,对GB 50010—2010《混凝土结构设计规范》、JTG D62—2004《公路钢筋混凝土及预应力混凝土桥涵设计规范》、美国规范ACI 318-11、欧洲规范EN 1992-1-1:2004和Zsutty拟合式的受剪承载力计算式进行误差分析。结果表明:对于集中荷载作用下无腹筋梁的受剪承载力,Zsutty拟合式预测结果的误差较小;纵筋配筋率较低时,GB 50010—2010和ACI 318-11公式的计算结果偏于不安全;EN 1992-1-1:2004公式较好地考虑了尺寸效应的影响。对于均布荷载作用下无腹筋梁的受剪承载力,ACI 318-11精确公式的预测效果较理想,而GB 50010—2010中的公式误差较大。基于计算模型误差分析结果,进一步探讨了我国规范公式的合理性,并通过试验数据的非线性拟合得到无腹筋梁受剪承载力的建议计算式。建议计算式采用统一表达式,能较好地预测集中荷载和均布荷载作用下无腹筋梁的受剪承载力。
[Abstract]:In order to improve the accuracy of calculation of shear capacity of reinforced concrete beams without web reinforcement, the shear test data of 743 simply supported beams with rectangular section without web reinforcement were collected at home and abroad. JTG D62-2004 < Design Code for reinforced concrete and Prestressed concrete Bridges and culverts of Highway ") is given for GB50010-2010" Code for Design of concrete structures ". American standard ACI 318-11. The error analysis of the shear capacity calculated by the fitting formulas of en 1992-1-1: 2004 and Zsutty is carried out in European Code. The results show that:. For the shear capacity of beams without web reinforcement under concentrated load. The error of Zsutty fitting prediction is small. The calculation results of GB50010-2010 and ACI 318-11 formula are not safe when the reinforcement ratio of longitudinal reinforcement is low. En 1992-1-1: 2004 formula takes into account the effect of size effect. The shear capacity of beams without webs under uniform load is considered. The accurate formula of ACI 318-11 has good prediction effect, but the formula error in GB50010-2010 is large. Based on the result of error analysis of calculation model. The rationality of the formula in China is further discussed, and the suggested formula for calculating the shear capacity of beams without webs is obtained by nonlinear fitting of test data. It can better predict the shear capacity of beams without webs under concentrated load and uniform load.
【作者单位】：湖南大学土木工程学院;中南林业科技大学土木工程与力学学院;
【基金】：国家自然科学基金项目(51338004,51078133) 住房和城乡建设部科技研发项目(2013-K4-21) 湖南省住房和城乡建设厅科技项目(KY201318) 湖南省重点学科建设项目(2013ZDXK009)
【分类号】：TU375
【正文快照】： 270引言钢筋混凝土构件斜截面剪切破坏机理较为复杂,其受剪承载力计算尚无统一的表达式。不同的理论模型、试验数据和工程习惯导致各国规范公式之间存在较大差异。按规范公式设计钢筋混凝土梁,其受剪承载力可靠性指标主要取决于计算模型的合理性,偏于保守的受剪承载力设计方法

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