CAJ | 학술논문

以QTZ4508型塔式起重机为研究对象，在Ansys中建立其金属结构的有限元模型，通过静力学分析确定其危险位置，进而确定疲劳易发点。通过施工工地试验，检测起重臂不同位置不同工况下的应力－时间历程，经数据处理，绘出了A1、 A2工况下NO.9单循环下的载荷谱。另外，观察一周内塔式起重机的工况数，在nSoft软件中运用雨流计数法编制了塔式起重机一周内的载荷谱，并将载荷谱外推至1 a。根据编制的载荷谱和塔式起重机的P－S－N曲线，运用nSoft软件预测塔式起重机的疲劳寿命，推算出使用年限约16.6 a，为其安全评估提供了理论和技术支持。
이QTZ4508형탑식기중궤위연구대상，재Ansys중건립기금속결구적유한원모형，통과정역학분석학정기위험위치，진이학정피로역발점。통과시공공지시험，검측기중비불동위치불동공황하적응력－시간역정，경수거처리，회출료A1、 A2공황하NO.9단순배하적재하보。령외，관찰일주내탑식기중궤적공황수，재nSoft연건중운용우류계수법편제료탑식기중궤일주내적재하보，병장재하보외추지1 a。근거편제적재하보화탑식기중궤적P－S－N곡선，운용nSoft연건예측탑식기중궤적피로수명，추산출사용년한약16.6 a，위기안전평고제공료이론화기술지지。
With QTZ4508 tower crane as the study object, the finite element mode is developed for the metal structure in Ansys.The dangerous position is determined through static analysis to identify the spot where fatigue easily happens.Through the construction site test, the stress-time history of the cargo boom at different positions under different conditions is detected.By processing the data, the load spectrum of NO.9 under single cycle is plotted under cases of A1 and A2.In addition, through observation of the quantity of working conditions of the tower crane within one week, the one-week load spectrum for the tower crane is prepared using the rain-flow counting method.The load spectrum is extrapolated to 1a.Ac-cording to the load spectrum and the P-S-N curve, the fatigue life of the tower crane is predicted using nSoft, equal to about 16.6a, providing theoretic and technical support for safety evaluation.