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锈蚀钢筋混凝土梁的抗剪承载力分析模型
余波1,2,3, 陈冰1,2,3, 刘阳1,2,3
1.广西大学 土木建筑工程学院;2.工程防灾与结构安全教育部重点实验室;3.广西防灾减灾与工程安全重点实验室, 南宁 530004
摘要:
锈蚀钢筋混凝土梁的传统抗剪承载力模型大多属于经验模型,考虑的影响因素不全面且缺乏严密的理论推导,导致计算精度有限。基于修正压力场理论,建立了可以综合考虑钢筋锈蚀对临界斜裂缝倾角、梁有效抗剪截面积、配筋率、配箍率等关键因素影响的锈蚀钢筋混凝土梁的抗剪承载力模型,通过与85组试验数据和现有模型的对比分析,验证了模型的适用性和计算精度。结果表明,该模型具有严密的理论基础,考虑的影响因素全面,计算精度较高、离散性较小。
关键词:  钢筋混凝土梁  锈蚀  抗剪承载力  临界斜裂缝倾角  剪跨比  修正压力场理论
DOI:10.11835/j.issn.1674-4764.2018.06.018
分类号:TU375.1
基金项目:国家自然科学基金(51368006、51678165、51668008)
Shear strength model of corroded reinforced concrete beams
Yu Bo1,2,3, Chen Bing1,2,3, Liu Yang1,2,3
1.School of Civil Engineering and Architecture;2.Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education;3.Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Guangxi University, Nanning 530004, P. R. China
Abstract:
The accuracy of traditional shear strength models for corroded reinforced concrete (RC)beam are far from satisfactory, since these models generally belong to the empirical methods which are lack of theoretical basis and do not take into account the various influential factors comprehensively. Hence, a shear strength model of corroded RC beam which takes into account the influences of corrosion on key factors including the critical diagonal crack angle, the effective shear cross-sectional area, the reinforcement ratio and the stirrup ratio was established based on the modified compression field theory (MCFT). The accuracy of the proposed model was validated by comparing with 85 sets of experimental data and several existing models. Analysis results show that the proposed model is of good accuracy and small discreteness.
Key words:  reinforced concrete beam  corrosion  shear strength  critical crack angle  shear span ratio  modified compression field theory
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