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Erschienen in:
2009 | OriginalPaper | Buchkapitel
Study on Curvature Modal Shapes of the Damage Reinforced Concrete Beams
verfasst von : Gang Xue, Xiaoyan Guo, Zhenhua Dong
Erschienen in: Computational Structural Engineering
Verlag: Springer Netherlands
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The basic principle of curvature modal is discussed, and a mathematical comparison between the vibration mode relative variable quantity and the modal curvature is given. Dynamic test is carried on 9 pieces of RC beams, in which the beam is subjected to an increasing static load in the middle to introduce cracks. After each load step, unloading, and an experimental dynamic monitoring is performed on the beam. Test data is analyzed by means of the system of Data Acquisition Signal Process, and the displacement modal is obtained. The curvature modal is gained from the displacement modal with second order differentiation method.The results show that curvature modal can identify the damage of RC simple-supported beam more accurately, and it is more sensitive to tiny damage. Based on the concept of function total differential, the error transmission formulas from vibration mode to the curvature mode are derived.