摘要
为了研究碳纤维布补强钢筋混凝土梁的动力性能,采用分离式方法建立了碳纤维布补强钢筋混凝土梁的有限元模型,并利用有限元方法对此模型进行了模态分析,得出了补强后钢筋混凝土梁的振动模态,其结果与试验值吻合,并将其与素混凝土梁和未补强钢筋混凝土梁的结果进行比较,发现在梁未开裂前,3种形式梁的自振频率差别不大,在此基础上对其进行了简谐集中荷载作用下的动力响应分析,得出在简谐集中动荷载作用下粘贴碳纤维布补强钢筋混凝土梁底部开裂的极限动荷载幅值—频率曲线。提出,在简谐集中荷载作用下,使补强梁开裂之动载幅值随激励的频率可分为两种区域:其一为在该梁各阶固有频率的约±10%区域是共振区,在此区域开裂荷载幅值很小,接近于零;另一区域为非共振区,在此区域开裂荷载的幅值稍小于静力开裂荷载。
The dynamic behaviour of RC beam strengthened by CFRP-sheets is researched, adopted separate method to establish finite element model of the RC beam strengthened by CFRP-sheets, and used FEM to do medal analysis of the model, have got the vibration modal, and the solution is good accordance with test value. On this base, a dynamic response analysis under harmonic concentrated load is made for the model,have got the curve of the high-point cracking harmonic load value VS frequency in the harmonic concentrated load. Indicate that, under harmonic concentrated load, the stimulated frequency which made the beam cracked is divided two area, one is the resonance area, in which the vibration cracking value is very small that close to zero;the other is non - resonance area, in which the vibration cracking value is slightly smaller than the static cracking value.
出处
《四川建筑科学研究》
北大核心
2008年第2期85-88,共4页
Sichuan Building Science
基金
江苏省自然科学基金资助项目(BK2004064)
