摘要
在建立研究相邻裂缝间"局部"曲率非线性分析模型的基础上,选取基于黏结-滑移理论的最大裂缝间距2Lb和最小裂缝间距Lb之间部分作为研究对象,对10根外贴复合纤维增强材料加固梁的跨中挠度进行了模拟。模拟结果与实测结果的对比表明,该模型能较好地预测构件的变形性能;裂缝的分布情况对变形虽有一定影响,但并不十分显著,因此,在实用上由弯矩-"平均"曲率关系计算构件的变形是合理的。
A model consisting of a system of nonlinear differential equations,named ＂block model＂,was constructed to study the ＂local＂ curvature between two adjacent cracks.Utilizing this model,the deflections at the midspan in 10 RC beams bonded with external CFRP were simulated when the distance between two consecutive cracks was the maximum crack spacing 2Lb and minimum crack spacing Lb,which could be obtained from cracking analysis based on bond stress and slip.Comparisons between the simulated midspan deflection and that of experiment indicate that the proposed nonlinear model is able to predict the deformability behavior of RC beams strengthened with external CFRP sheets.Furthermore,the results indicate that the crack distribution has little influence on deflection of beam,so the traditional approach called moment-＂average＂ curvature is reasonable to calculate the deflection of beam in practice.
出处
《工业建筑》
CSCD
北大核心
2013年第8期79-82,89,共5页
Industrial Construction
基金
国家自然基金项目(51208183)
河南省教育厅自然科学研究项目(2010A560008)
河南理工大学博士基金资助项目(B2009-37)
