CAJ | 학술논문

选用桁架结构作为研究对象，应用应变模态分析方法对桁架结构的损伤进行检测。由位移模态振型推导应变模态进而用应变模态差值作为桁架结构损伤检测指标，提出了一种基于3σ准则的损伤阈值。通过应变模态差值与损伤阈值的对比来判别损伤有无并对损伤进行定位，用损伤前后应变差值的突变大小来初步确定桁架结构的损伤程度。对一具体桁架结构的单处和多处不同程度损伤工况，结合有限元软件进行了数值模拟。实际桁架的损伤检测实验验证了该方法的有效性。
선용항가결구작위연구대상，응용응변모태분석방법대항가결구적손상진행검측。유위이모태진형추도응변모태진이용응변모태차치작위항가결구손상검측지표，제출료일충기우3σ준칙적손상역치。통과응변모태차치여손상역치적대비래판별손상유무병대손상진행정위，용손상전후응변차치적돌변대소래초보학정항가결구적손상정도。대일구체항가결구적단처화다처불동정도손상공황，결합유한원연건진행료수치모의。실제항가적손상검측실험험증료해방법적유효성。
Taking the truss structure as the research object,strain modal analysis is used to identify the damage of the truss structure. The strain modal can be deduced from displacement model shapes,then the difference of strain modal is used to be truss structural damage detection index,and the damage threshold based on the 3σ criteria is presented. Through the strain mode difference and damage threshold of contrast to determine whether there is damage and locate it,furthermore preliminary determine the extent of the truss structure with the size of the strain difference between before and after injury. The damage conditions of single damage and multiple damages in different degree of a practical truss structure,are numerically simulated with finite element software numerical simulations respectively. Furthermore further experiment research,by applying this method to actual truss damage detection,proves the effectiveness of the proposed method.