【摘要】 为研究初始开裂对碳纤维布(CFRP)加固砌体结构的影响,选取2条天然波和1条人工波,对2个1/4比例缩尺的两层两开间带构造柱CFRP加固砌体结构模型进行了模拟地震振动台试验,并比较试验结果.对比试验结果,随着输入地震峰值加速度的增加,碳纤维布加固开裂砌体结构模型的相对位移、加速度放大系数的变化幅度均小于碳纤维布加固未开裂砌体结构模型,且前者的层间位移角更小;试验表明,碳纤维布能够有效减小砌体结构的刚度退化,提高砌体结构的抗震性能,初始裂缝的存在使得碳纤维布在加固砌体结构时能够更加有效地发挥其加固性能.更多还原

【Abstract】 To study the influence of the initial cracks on the carbon fiber reinforced plastic(CFRP)reinforced masonry structure,shaking table tests of two 1/4scaled two-story and two-bay masonry structures involving constructional columns which was strengthened by CFRP laminates were carried out under the excitations of two natural earthquake records and another artificial one,and comparing the experimental results.Comparison of experimental results indicates that with the increase of input earthquake peak acceleration,CFRP-strengthened masonry structures with initial cracks yielded less variation of relative displacement and acceleration amplification ratio than the model without initial crack;meanwhile,its interstory displacements are smaller.Experiment indicates the CFRP laminates can reduce the stiffness degradation of masonry structures and improve seismic performance of masonry structures;for the reinforced masonry structures,the presence of initial cracks makes CFRP exert its reinforcement performance more effectively.更多还原