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Damage Identification in Simply Supported Bridge Based on Rotational-Angle Influence Lines Method 被引量:11
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作者 Yu Zhou Shengkui Di +2 位作者 Changsheng Xiang Wanrun Li Lixian Wang 《Transactions of Tianjin University》 EI CAS 2018年第6期587-601,共15页
To locate and quantify local damage in a simply supported bridge, in this study, we derived a rotational-angle influence line equation of a simply supported beam model with local damage. Using the diagram multiplicati... To locate and quantify local damage in a simply supported bridge, in this study, we derived a rotational-angle influence line equation of a simply supported beam model with local damage. Using the diagram multiplication method, we introduce an analytical formula for a novel damage-identification indicator, namely the diff erence of rotational-angle influence linescurvature(DRAIL-C). If the initial stiff ness of the simply supported beam is known, the analytical formula can be effectively used to determine the extent of damage under certain circumstances. We determined the effectiveness and anti-noise performance of this new damage-identification method using numerical examples of a simply supported beam, a simply supported hollow-slab bridge, and a simply supported truss bridge. The results show that the DRAIL-C is directly proportional to the moving concentrated load and inversely proportional to the distance between the bridge support and the concentrated load and the distance between the damaged truss girder and the angle measuring points. The DRAIL-C indicator is more sensitive to the damage in a steel-truss-bridge bottom chord than it is to the other elements. 展开更多
关键词 Rotational-angle influence lines Damage identification Simply supported bridge curvature. Moving load Anti-noise property
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