设计一个比例为1∶4的4层钢管混凝土带楼板的空间框架结构模型,通过柱端钢管切口损伤来模拟震后钢管混凝土框架结构损伤,进行脉冲激励模态试验,得到健康状态和损伤状态结构的模态参数。数值模拟对应试验工况下的损伤位置和损伤程度并得...设计一个比例为1∶4的4层钢管混凝土带楼板的空间框架结构模型,通过柱端钢管切口损伤来模拟震后钢管混凝土框架结构损伤,进行脉冲激励模态试验,得到健康状态和损伤状态结构的模态参数。数值模拟对应试验工况下的损伤位置和损伤程度并得到相应的模态参数。通过交叉模型交叉模态(Cross Model Cross Mode,简称CMCM)方法对钢管混凝土框架结构进行损伤识别研究,验证CMCM方法的可行性和有效性。展开更多
提出了一种用交叉模型交叉模态(Cross Model Cross Mode,CMCM)方法与L1正则化结合的损伤识别方法。首先介绍了CMCM方法的基本原理,以及L2正则化与L1正则化的特点。然后通过一个实验室的钢框架结构对提出的方法进行了验证。结果表明,CMC...提出了一种用交叉模型交叉模态(Cross Model Cross Mode,CMCM)方法与L1正则化结合的损伤识别方法。首先介绍了CMCM方法的基本原理,以及L2正则化与L1正则化的特点。然后通过一个实验室的钢框架结构对提出的方法进行了验证。结果表明,CMCM方法与L2正则化结合容易造成非损伤单元的误判,而在CMCM方法中使用L1正则化则能更准确地识别结构的损伤。即使仅用第一阶测量模态,用L1正则化技术求解CMCM方程也能很准确地识别框架结构的损伤。展开更多
In the study of finite element model updating or damage detection,most papers are devoted to undamped systems.Thus,their objective has been exclusively restricted to the correction of the mass and stiffness matrices.I...In the study of finite element model updating or damage detection,most papers are devoted to undamped systems.Thus,their objective has been exclusively restricted to the correction of the mass and stiffness matrices.In contrast,this paper performs the model updating and damage detection for damped structures.A theoretical contribution of this paper is to extend the cross-model cross-mode(CMCM) method to simultaneously update the mass,damping and stiffness matrices of a finite element model when only few spatially incomplete,complex-valued modes are available.Numerical studies are conducted for a 30-DOF(degree-of-freedom) cantilever beam with multiple damaged elements,as the measured modes are synthesized from finite element models.The numerical results reveal that applying the CMCM method,together with an iterative Guyan reduction scheme,can yield good damage detection in general.When the measured modes utilized in the CMCM method are corrupted with irregular errors,assessing damage at the location that possesses larger modal strain energy is less sensitive to the corrupted modes.展开更多
文摘设计一个比例为1∶4的4层钢管混凝土带楼板的空间框架结构模型,通过柱端钢管切口损伤来模拟震后钢管混凝土框架结构损伤,进行脉冲激励模态试验,得到健康状态和损伤状态结构的模态参数。数值模拟对应试验工况下的损伤位置和损伤程度并得到相应的模态参数。通过交叉模型交叉模态(Cross Model Cross Mode,简称CMCM)方法对钢管混凝土框架结构进行损伤识别研究,验证CMCM方法的可行性和有效性。
文摘提出了一种用交叉模型交叉模态(Cross Model Cross Mode,CMCM)方法与L1正则化结合的损伤识别方法。首先介绍了CMCM方法的基本原理,以及L2正则化与L1正则化的特点。然后通过一个实验室的钢框架结构对提出的方法进行了验证。结果表明,CMCM方法与L2正则化结合容易造成非损伤单元的误判,而在CMCM方法中使用L1正则化则能更准确地识别结构的损伤。即使仅用第一阶测量模态,用L1正则化技术求解CMCM方程也能很准确地识别框架结构的损伤。
基金the National High-Tech Research and Development Program of China("863")(Grant No.2006AA09Z331)the China National Science Fund for Distinguished Young Scholars(Grant No.50325927)the National Natural Science Foundation of China(Grant No.50739004)
文摘In the study of finite element model updating or damage detection,most papers are devoted to undamped systems.Thus,their objective has been exclusively restricted to the correction of the mass and stiffness matrices.In contrast,this paper performs the model updating and damage detection for damped structures.A theoretical contribution of this paper is to extend the cross-model cross-mode(CMCM) method to simultaneously update the mass,damping and stiffness matrices of a finite element model when only few spatially incomplete,complex-valued modes are available.Numerical studies are conducted for a 30-DOF(degree-of-freedom) cantilever beam with multiple damaged elements,as the measured modes are synthesized from finite element models.The numerical results reveal that applying the CMCM method,together with an iterative Guyan reduction scheme,can yield good damage detection in general.When the measured modes utilized in the CMCM method are corrupted with irregular errors,assessing damage at the location that possesses larger modal strain energy is less sensitive to the corrupted modes.
