预应力碳纤维布加固混凝土梁刚度计算方法研究

摘要

通过15根碳纤维布加固梁的受弯性能试验,对加固梁的刚度性能进行了研究,分析了初始荷载和碳纤维布预应力对刚度的影响.并采用解析方法推导了预应力碳纤维布加固具有初始荷载混凝土梁的刚度计算公式.与试验结果的比较分析表明,公式具有较高精度,且形式上与钢筋混凝土梁公式较为一致,容易为工程设计人员接受,可供工程加固设计应用.%Fifteen reinforced concrete beams strengthened with carbon fiberglass reinforced plastic (CFRP) sheets were experimentally investigated to research the stiffness of the beams,and the effect of the initial load and pre-stressing of CFRP on stiffness of the beams was studied.A calculation method of the stiffness of the RC beams strengthened with pre-stressed CFRP sheets was proposed,after analyzing the method for calculating the stiffness of RC beams,which took into account the effects of pre-stressing force and initial load.It has been testified that the formulas are in agree with the result of experiments and can be available for reference in design.