CAJ | 학술논문

基于疲劳和静载作用下混凝土损伤失效机理的一致性，以及混凝土的宏观变形取决于内部微裂纹扩展的基本原理，理论上分析了疲劳变形曲线与静载应力-应变曲线之间的对应关系，并进行了试验验证。结果表明，疲劳变形曲线第二阶段终点的最大变形为材料常数，与应力水平的大小和加载历史无关，且与静载作用下混凝土的峰值应变相当；疲劳变形曲线第三阶段与静载曲线的软化段有一定的对应关系，混凝土疲劳破坏时的最大应变与单调加载软化段中最大疲劳应力对应的应变相等。研究结果为从本质上揭示疲劳变形的演化规律提供参考。
기우피로화정재작용하혼응토손상실효궤리적일치성，이급혼응토적굉관변형취결우내부미렬문확전적기본원리，이론상분석료피로변형곡선여정재응력-응변곡선지간적대응관계，병진행료시험험증。결과표명，피로변형곡선제이계단종점적최대변형위재료상수，여응력수평적대소화가재역사무관，차여정재작용하혼응토적봉치응변상당；피로변형곡선제삼계단여정재곡선적연화단유일정적대응관계，혼응토피로파배시적최대응변여단조가재연화단중최대피로응력대응적응변상등。연구결과위종본질상게시피로변형적연화규률제공삼고。
This paper summed up the development process and mechanism of deformation for concrete subjected to fatigue or static load. Based on principle that the failure mechanisms for concrete should be consistent, and the deformation of concrete depends on the development of inner microcracks, the correspondence relationship between curves of fatigue deformation and static stress-stress curve was theoretically analyzed, it is also verified by experimentation at last. As it turned out, the maximum deformation on the end of the second stage of fatigue deformation curve is constant, which is equal to the strain peak value under static bending load, point and it is irrelative to stress level and loading history. The maximum strain value of the fatigue failure equals to that of corresponding maximum fatigue stress in the softened stress-strain under static load. It offers a useful reference for study on the intrinsic evolution law of fatigue deformation.