At present those should be urgent to solve in the field of engineering for truss structures,which are research structural damage,performance reducing and reasonably evaluate structural safety conditions. In order to improve efficiency and reliability for damage diagnosis,rate of change in elemental modal strain energy is presented as dynamic index for damage locations of beam-type truss structures. The numerical simulation example of a beam-type truss structure indicates that the damage location and severity in structures,with single damage,lighter ones and multiple ones,can be detected efficiently by rate of change in elemental modal strain energy with only the first order mode. The results indicate that the proposed method based on modal strain energy can accurately identify the damage location of truss structures with the noisy modal data. Furthermore,damage degree can be derived from the amplitude value rate of change in modal strain energy for the detected damage element. Compared to such indexes as modal strain energy change,modal curvature change and rate of change in modal curvature etc,the effectiveness and advantage are shown for the dynamic index of rate of change in elemental modal strain energy.
Beam-type truss structure Damage identification Modal curvature Modal strain energy change Rate of change in elemental modal strain energy
Yong-Mei Li Jin-Xin Zhao Guo-Fu Sun Bo-Yan Yang Xi-Yuan Zhou
Beijing Key Lab of Earthquake Engineering and Strvctural Retrofit,Beijing University of Technology,B Beijing Key Lab of Earthquake Engineering and Strvctural Retrofit,Beijing University of Technology,B The Key Laboratory of Urban Security and Disaster Engineering,Ministry of Education,Beijing Universi The Key Laboratory of Urban Security and Disaster Engineering,Ministry of Education,Beijing Universi