摘要
通过两组钢筋混凝土简支梁在相同条件下预先加载至开裂后采用受拉边粘贴钢板或粘贴碳纤维布,受压边增大截面的加固试验,对比两种情况下的梁的跨中挠度、原受拉钢筋应变、新增钢板或碳纤维应变、原梁顶混凝土应变及新增混凝土顶面应变随弯矩的变化,分析其加固效果.结果表明:粘贴钢板加固与粘贴碳纤维加固相比,前者对截面各新旧材料受力和梁的刚度改善程度明显高于后者;前者对抗弯能力提高方面也明显优于后者;后者适合用于梁的抗裂加固,而不适合用于提高抗弯能力及变形能力加固;涂抹法粘贴钢板加固在抑制裂缝开展方面不如粘贴碳纤维加固;对适筋梁,纤维的高强度难于得到发挥.
The effects of two strengthening methods were analysised based on comparing the midspan deflections and the strain changes of original tensile reinforcement,later bonded steel plate or CFRP,original concrete superface and later added concrete superface with bending moment,through two groups of reinforcement testing that simple supported RC beams were preloaded to cracking under the same conditions,and then reinforced by bonding steel plate or CFRP on the tensile side and increasing section area on the pressure side.The results show that the strengthening of bonding steel plate is obviously superior to bonding CFRP in the improvements of the old and new material stress,the beam stiffness and the bending capacity,so the latter is fit for anti-cracking reinforcement,not for the strengthening of increasing bending capacity or resistance to deformation capacity.On the other side,the strengthening of bonding steel plate by daubing is inferior to bonding CFRP in inhibiting cracks development.As to the balanced-reinforced beam,the high strength of fiber is hardly play.
出处
《应用基础与工程科学学报》
EI
CSCD
2011年第1期36-43,共8页
Journal of Basic Science and Engineering
基金
国家自然科学基金(50808085)
关键词
桥梁工程
钢筋混凝土梁
对比试验
粘钢加固
粘纤维加固
bridge engineering
RC beam
contrast experiment
strengthening bonded steel plate
strengthening bonded CFRP
