Abstract
To identify the damaged beams in large-scale spatial structure, a damage indicator based on virtual axial strain calculated from mode shape vectors was proposed. The damage detection process was performed based on the dynamic simulation flowchart. Firstly, random signals were used for excitation and the damage was simulated by decreasing beam elasticity modulus. Then, the NEWMARK-β precision direct integral method was appreciated for calculating time history response. Finally, the frequency-domain decomposition method only using output response signal was selected for modal parameter estimation. A double-layer grid structure was taken as example for verifying the damage detection method. Results indicate that the proposed indicator was insensitive to environmental noise and capable of localizing multiple damaged members in space structure without the baseline data.
Highlights
Large-scale lightweight grid structures provide no obstacle view. ey are widely used in civil engineering structures, such as sport stadium, exhibition mall, shopping center, and airport roof
Numerous damage detection indicators and damage detection algorithms were proposed to detect, localize, and quantify damage scenarios, and many key structures were instrumented with the structural health monitoring system
By calculating node displacement vectors from mode shapes to construct strain along the axis and by comparing strains with the adjacent beams to localize the damaged beams based on monitoring the abnormal value of virtual axial strain, here, a user-defined program based on MATLAB/Simulink platform was developed, and a doublelayer grid structure was taken as example to demonstrate its feasibility
Summary
Large-scale lightweight grid structures provide no obstacle view. ey are widely used in civil engineering structures, such as sport stadium, exhibition mall, shopping center, and airport roof. Oyarzo-Vera and Chouw [3] conducted damage identification of unreinforced masonry panels using vibration-based techniques, and the outcomes demonstrated that vibration-based damage detection in unreinforced masonry structures can be satisfactorily performed. Dynamic parameters such as natural frequency, damping ratio, modal shape, strain mode shape, modal strain energy, and flexibility matrix were fully developed for damage detection. By calculating node displacement vectors from mode shapes to construct strain along the axis and by comparing strains with the adjacent beams to localize the damaged beams based on monitoring the abnormal value of virtual axial strain, here, a user-defined program based on MATLAB/Simulink platform was developed, and a doublelayer grid structure was taken as example to demonstrate its feasibility
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