CAJ | 학술논문

针对超高性能水泥基复合材料和基体砂浆，采用三点弯曲梁进行不同种类纤维、不同尺寸以及不同初始缝高比的静载断裂试验。并且在静载断裂试验的基础上进行初步动态断裂试验。依据双K断裂准则计算断裂参数，分析初始缝高比和不同种类纤维对断裂韧度的影响。研究动态断裂作用下超高性能水泥基复合材料承载能力和刚度的退化规律。试验结果表明：随着初始缝高比的增大，超高性能水泥基复合材料和基体砂浆的起裂断裂韧度表现为不变的趋势，失稳断裂韧度增加。进口纤维在改善极限荷载和增韧效果方面作用明显，国产纤维极限荷载的改善效果优于增韧效果。经过动态断裂作用的超高性能水泥基复合材料承载能力和刚度均有所下降；不带裂缝试件在整个疲劳过程中刚度退化不明显，带裂缝试件在疲劳过程中刚度退化过程可描述为：快-慢-快三个过程。
침대초고성능수니기복합재료화기체사장，채용삼점만곡량진행불동충류섬유、불동척촌이급불동초시봉고비적정재단렬시험。병차재정재단렬시험적기출상진행초보동태단렬시험。의거쌍K단렬준칙계산단렬삼수，분석초시봉고비화불동충류섬유대단렬인도적영향。연구동태단렬작용하초고성능수니기복합재료승재능력화강도적퇴화규률。시험결과표명：수착초시봉고비적증대，초고성능수니기복합재료화기체사장적기렬단렬인도표현위불변적추세，실은단렬인도증가。진구섬유재개선겁한하재화증인효과방면작용명현，국산섬유겁한하재적개선효과우우증인효과。경과동태단렬작용적초고성능수니기복합재료승재능력화강도균유소하강；불대렬봉시건재정개피로과정중강도퇴화불명현，대렬봉시건재피로과정중강도퇴화과정가묘술위：쾌-만-쾌삼개과정。
Using the three-point bending beams with different kinds of fiber,different specimens sizes and different initial seam height ratio has carried on the static load fracture experiments,which directed at engineered cementitious composites and matrix.And on the basis of the static load fracture tests conducted preliminary dynamic fracture test.Based on the double-K fracture criterion to calculate the fracture parameters and analyz the initial seam height ratio and the influence of different kinds of fiber on fracture toughness.Moreover,study bear-ing capacity and stiffness degradation law of engineered cementitious composites under dynamic fracture load.Experimental results showed that with the increase of initial seam height ratio,engineered cementitious composites and matrix the initial fracture toughnessKiniIC showed the same trend,and unstable fracture toughnessKiniIC increase of instability.Imported fiber in improvement of ultimate load and toughening effect obviously,the improvement of the domestic fiber limit load effect was better than that of toughening effect.Through dynamic fault-ing load engineered cementitious composites bearing capacity and stiffness were declined.Without fracture specimen rigidity degeneration was not obvious in the whole process of fatigue,and fracture specimens in the process of fatigue stiffness degradation process can be de-scribed as fast-slow-fast three process.