CAJ | 학술논문

为研究桥式起重机箱型主梁的在随机疲劳载荷下的疲劳特性，采用有限元软件，对其在五种典型工况下结构的静力特性进行了分析。分析结果显示，该主梁结构在其1／2跨附近的腹板与下盖板角焊缝处以及横向加筋板与腹板连接处焊趾处两个位置易产生应力集中，形成疲劳裂纹。采用多载荷步瞬态分析的方法确定该起重机主梁在完整工作循环下的应力热点区域关键节点的应力变化曲线及相应的载荷谱。基于有限元分析结果，利用FE-safe软件计算其在各载荷时间历程下的疲劳寿命分析，并结合统计数据估算其疲劳寿命。
위연구교식기중궤상형주량적재수궤피로재하하적피로특성，채용유한원연건，대기재오충전형공황하결구적정력특성진행료분석。분석결과현시，해주량결구재기1／2과부근적복판여하개판각한봉처이급횡향가근판여복판련접처한지처량개위치역산생응력집중，형성피로렬문。채용다재하보순태분석적방법학정해기중궤주량재완정공작순배하적응력열점구역관건절점적응력변화곡선급상응적재하보。기우유한원분석결과，이용FE-safe연건계산기재각재하시간역정하적피로수명분석，병결합통계수거고산기피로수명。
The fatigue property of the bridge crane girder under random fatigue load is researched in the paper , and the static characteristics in five typical structural conditions were analyzed by finite element software .The results showed it is easy to be stress concentration and cause fatigue cracks , in fillet weld seat between web plate near the 1/2 cross and low cover plate , and the connection welded toes between transverse stiffened thin plate and web plate .Stress key node ’ s stress curve and its corresponding load spectrum of the crane main gird-er are determined by multi load step transient analysis .The FE-safe software is used to calculate the fatigue life under various load time based on the results of finite element analysis .Finally, according to statistics , the fa-tigue life of crane girder is estimated .