摘要
采用有限元分析和试验研究的方法 ,探讨纤维薄板长度对FRP增强钢筋混凝土梁抗弯强度的影响 ,试图找到在满足增强梁抗弯强度前提下的最佳纤维板粘贴长度 ,为该类构件的优化设计奠定理论基础。有限元分析结果表明 ,纤维板粘贴长度不同 ,增强钢筋混凝土梁的应力分布、能量分布及极限承载力等均有较大变化。通过探讨钢筋和纤维板在承载过程中的能量变化 ,推算出纤维板最佳粘贴长度的下限为L/S =0 6 9;通过对试验梁刚度的探讨 ,又求得纤维板最佳粘贴长度的上限为L/S =0 83。上述分析结果在相同条件下进行的 5组 15根增强梁的三点弯曲试验中得到了初步验证。
A finite element analysis and tests are performed to discuss the effect of length of carbon fiber sheet(CFS) on the bending strength of FRP reinforced concrete beams, and discover the most optimal length with their strength enough, which is used for a theory of optimization design of the same type beams. The results of the FEM analyses show that 1) the stress distribution, the energy distribution and the extreme load carrying capacity vary considerably as the length of CFS is changed; 2) the lower limit of the optimal length of fibre sheet L/S =0 69(where L is the length of CFS, and S is the distance between two fulcrums) is calculated by the energy variation of the reinforced bar and fiber sheet when loads are applied on the beams; 3) its upper limit L/S =0 83 is obtained through discussion of the stiffness of the RC beams reinforced by CFS. The above results are verified by the three point bending tests in which five groups of fifteen RC beams reinforced by CFS are carried out.
出处
《工业建筑》
CSCD
北大核心
2003年第4期81-83,71,共4页
Industrial Construction
基金
国家自然科学基金 (项目编号 :19972 0 2 0 )
广东省自然科学基金(项目编号 :990 5 67)资助
