Falling-off Prevention and Anti-overturning Mechanical Property Analysis and Application of New Type of Ball Steel Bearing
The study proposed a new type of falling-off prevention and anti-overturning ball steel bearing device for bridges under earthquake and extreme eccentric load conditions.The traditional bridge falling-off prevention measures(e.g.,blocking blocks and anti-falling chains)have problems of poor structural reliability,easy damage,high construction cost,and aesthetic impact.Meanwhile,the existing studies on bearings mainly focus on the performance of falling-off prevention,with less research on the anti-overturning performance.To solve these issues,taking the typical urban ultra-wide cantilevered steel beam as a study case,the new type of spherical steel bearing with both falling-off prevention and anti-overturning functions was designed based on the structural seismic and anti-overturning analysis.The bearing was equipped with shear pins,lateral steel blocks and anchor rods on the basis of traditional ball steel bearings.It improved the falling-off prevention performance through multiple defense lines,and utilized the flexible buffering and customizable horizontal resistance to ensure the stability and safety of the bearing under earthquake and extreme eccentric loads.The study verified the significant effects of the new type of bearing on controlling displacement of main beam,reducing internal forces at pier bottom,and improving anti-overturning ability through parameter sensitivity analysis,seismic falling-off prevention performance analysis,and anti-overturning performance analysis.The result indicates that after adopting the new type of falling-off prevention ball steel bearing,the main beam displacement and main pier internal force are both controlled within a reasonable range,avoiding the risk of falling-off and adjacent collision.Simultaneously,the anti-overturning performance of bridge is significantly improved.In addition,the bearing also has the advantages of simple structure,easy maintenance,replacement,and moderate cost.It has obtained a utility model patent and been successfully applied in practical engineering,providing strong guarantees for the bridge engineering safety and durability.
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