CAJ | 학술논문

以灌河大桥为工程背景，建立了结构精细有限元模型和多尺度有限元模型，并进行全桥环境振动试验，以获取结构的实测动力特性。基于两阶段响应面方法，分别对多尺度模型与精确有限元模型之间的误差和初步修正后多尺度模型与实际结构之间的误差进行修正，并将修正后结果与实测值进行比较。结果表明：经过两阶段响应面模型修正后的计算结果与实测结果吻合较好，最大频率相对误差不超过8％，模态保证准则MAC值基本在90％以上，说明两阶段响应面方法能够较好地进行多尺度模型修正，保证修正后的模型参数仍然具有其物理意义；修正后的有限元模型可以进一步应用于多尺度损伤识别及损伤预后，服务于桥梁健康监测及安全评估。
이관하대교위공정배경，건립료결구정세유한원모형화다척도유한원모형，병진행전교배경진동시험，이획취결구적실측동력특성。기우량계단향응면방법，분별대다척도모형여정학유한원모형지간적오차화초보수정후다척도모형여실제결구지간적오차진행수정，병장수정후결과여실측치진행비교。결과표명：경과량계단향응면모형수정후적계산결과여실측결과문합교호，최대빈솔상대오차불초과8％，모태보증준칙MAC치기본재90％이상，설명량계단향응면방법능구교호지진행다척도모형수정，보증수정후적모형삼수잉연구유기물리의의；수정후적유한원모형가이진일보응용우다척도손상식별급손상예후，복무우교량건강감측급안전평고。
Based on the engineering background of the Guanhe Bridge, a composite cable-stayed bridge, the accurate finite element ( FE) model and the multi-scale finite element ( MFE) model was established.The actual dynamic characteristics is obtained based on the visual inspection and ambient vibration testing.Then based on two-phase response surface methods, the error between the MFE model and the accurate FE model will be updated firstly, and the error between the updated MFE mod-el and the bridge will be updated later and the results between the updated model and the measure-ments.It can be concluded that the results from the updated MFE model based on the two-phase re-sponse surface methods are in good agreement with the measurements, with the maximum error is less than 8%and the values of MAC being above 90%.Which above that the two-phase response surface methods are suitable for MFE model updating, and the parameters of the MFE model still keep their physical significance after updating.It can be used to multi-scale damage detection and multi-scale damage prognosis, and employed for bridge health monitoring and safety evaluation.