【摘要】 研究了疲劳加载历史对碳纤维混凝土断裂能及断裂韧度的影响规律 ,对三点弯曲梁预先施加等幅和变幅疲劳荷载 ,然后通过稳定的断裂试验测得各试件的荷载—加载点位移全曲线及荷载—裂纹嘴张开位移全曲线。最后与未加疲劳荷载的准静载试验测得的碳纤维混凝土断裂参数作了对比。试验结果证明 :当预疲劳荷载的幅值超过某一特定值后 ,碳纤维混凝土的断裂参数降低 ,即碳纤维混凝土的断裂参数是与循环加载幅值有关的物理量。更多还原

【Abstract】 This paper reports the results of an experimental study of the effect of cyclic loading history on the fracture toughness and fractrue energy of carbon fiber reinforced concrete equal and variety range cyclic loading is carried out and then the load displacement diagrams and the load crack mouth opening displacement diagrams are all obtained by means of three point bend test on notched beams,by comparison with the results of quasistatic test where no preload is applied.It is found that the fracture strength of carbon fiber reinforced concrete noticeably decreased if the preloading strength is greater than a certain threshold value. So it is concluded that the fracture parameters are dependent on the loading history.更多还原