Numerical and experimental study on bridge beam-end fastener's static characteristics in urban rail transit
In order to explore the simply-supported bridge beam-end fastener's static characteristics in urban rail transit,ef-forts are made to measure and collect the data of the stress and the strain on the double-layer elastic fastener at the U-shaped bridge beam end on rail transit's elevated line.Then,the analysis is conducted on the changing law of the force exerted on the fastener forces:both the 2D and 3D finite-element models are set up(with the double-layer elastic fastener's nonlinear stiffness taken into consideration;conservatively ignoring the effects of the wheel load eccentricity and the lateral force).Next,the analsy-is is conducted on the force on the fastener changing with the beam end's rotation and misalignment.The effects of such parame-ters as the cantilever's length and the fastener's stiffness are also explored,The results show that the force exerted on the fasten-er varies linearly with the beam end's rotation and misalignment.The longer the cantilever and the greater the fastener's stifiness are,the greater the force exerted on the fastener will be.The maximum upward force exerted on the fastener is close to the initial preload;a large upward force repeatedly applied on the beam-end fastener over time contributes to the bolt's loosening and the spring bar's dropout.
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