CAJ | 학술논문

为研究钢桥面板顶板与竖向加劲肋连接角焊缝的疲劳性能，采用机械型振动疲劳试验机对制作的9个试件进行等幅疲劳加载，并通过名义应力和热点应力2种方法对试件焊缝疲劳性能进行评价。试验结果表明：疲劳荷载作用下，试件疲劳裂纹开展路径均从焊趾处萌生、沿焊趾开展、最终垂直于焊趾沿板横向往两侧对称扩展。采用名义应力法时，试验结果均位于JSSC-G疲劳强度为50 MPa的S-N曲线上方；采用热点应力法时，试验结果均位于Eurocode 3规范疲劳强度为100 MPa的S-N曲线上方。建议本试验构件疲劳细节的角焊缝疲劳强度取名义应力50 MPa、热点应力100 MPa。
위연구강교면판정판여수향가경륵련접각한봉적피로성능，채용궤계형진동피로시험궤대제작적9개시건진행등폭피로가재，병통과명의응력화열점응력2충방법대시건한봉피로성능진행평개。시험결과표명：피로하재작용하，시건피로렬문개전로경균종한지처맹생、연한지개전、최종수직우한지연판횡향왕량측대칭확전。채용명의응역법시，시험결과균위우JSSC-G피로강도위50 MPa적S-N곡선상방；채용열점응역법시，시험결과균위우Eurocode 3규범피로강도위100 MPa적S-N곡선상방。건의본시험구건피로세절적각한봉피로강도취명의응력50 MPa、열점응력100 MPa。
In order to study the fatigue performance of a steel bridge deck and a vertical stiffener connection fillet weld, a mechanical vibration fatigue testing machine was used to test nine specimens with constant amplitude fatigue loading, and the fatigue performance of the welds of the specimens was evaluated with two methods, the nominal stress and hot spot stress methods. The test results show that, under the fatigue load, the specimens’ fatigue crack initiation occurs on the weld toe, and then the cracks grow along the weld toe and finally extend in bilateral symmetrical manner along the plate transverse, which is perpendicular to the weld edge. With the nominal stress method, the test results are above the S-N curve in JSSC-G, which has a fatigue strength of 50 MPa. With the hot spot stress method, the test results are above the S-N curve in Eurocode 3 specification, which has a fatigue strength of 100 MPa. The results suggest that the fatigue strength of the fillet weld of the test specimens’ fatigue details should be set at 50 MPa for nominal stress and 100 MPa for hot spot stress.