CAJ | 학술논문

为开展预应力碳纤维增强复合材料（CFRP）布加固混凝土受弯构件时对正截面裂缝影响的研究，设计制作了配筋率不同的2组共计8根试验梁。在承受40％极限荷载的基础上利用预应力CFRP 布对试验梁正截面进行加固，并完成其静载试验，获得混凝土受弯构件在前期加载和加固后的二次受力过程中弯曲段裂缝分布、裂缝宽度和高度的试验数据。在试验数据的基础上，通过理论分析，提出了与《混凝土结构设计规范》相协调的预应力 CFRP 布加固负载混凝土梁弯曲段裂缝平均间距和最大裂缝宽度的计算公式。研究结果表明：二次受力过程中，预应力 CFRP 布能有效抑制裂缝的开展，且随着预拉应力的增加，裂缝平均间距和裂缝宽度均减小。
위개전예응력탄섬유증강복합재료（CFRP）포가고혼응토수만구건시대정절면렬봉영향적연구，설계제작료배근솔불동적2조공계8근시험량。재승수40％겁한하재적기출상이용예응력CFRP 포대시험량정절면진행가고，병완성기정재시험，획득혼응토수만구건재전기가재화가고후적이차수력과정중만곡단렬봉분포、렬봉관도화고도적시험수거。재시험수거적기출상，통과이론분석，제출료여《혼응토결구설계규범》상협조적예응력 CFRP 포가고부재혼응토량만곡단렬봉평균간거화최대렬봉관도적계산공식。연구결과표명：이차수력과정중，예응력 CFRP 포능유효억제렬봉적개전，차수착예랍응력적증가，렬봉평균간거화렬봉관도균감소。
In order to study the effect of reinforced concrete flexural members with prestressed carbon fiber reinforced polymer (CFRP) sheet on cross-section cracks ,two groups of eight test beams with different reinforcement ratios were designed .Based on bearing 40% ultimate load , the cross-section test beams were strengthened with prestressed CFRP sheet ,and the static load test was completed to obtain test data of bending crack distribution ,crack width and height of concrete flexural members in the early stage of loading and being strengthened after second loading .Based on the test data , through theoretical analysis ,calculation formulae of average crack spacing and maximum crack width of concrete beam strengthened with prestressed CFRP sheet were put forward ,which coordinated with Code f or Design of Concrete Structures .The study results show that in the process of second loading ,prestressed CFRP sheet can effectively suppress the development of crack ,and with increasing of the prestressed tensile stress , the average crack spacing and crack width decrease .