Anti Overturning Performance Evaluation of Medium and Small Span Bridges under Complex Geological Conditions

Tianming Wang

Kunming Survey & Design Institute, State Forestry & Grassland Administration, Kunming, 650216, China

Abstract: In recent years, the bridge overturning and collapse events reveal the huge safety risk of medium and small span bridges. When the lateral anti overturning performance of these medium and small span bridges is transformed, affected by the span bridge structure, the bearing capacity of bridge pier, the road layout under the bridge and other objective factors, the commonly used methods are lengthening the beam, adding capping beam, adding pier pile and so on It cannot completely solve the problem of anti overturning performance evaluation of bridges under complex geological conditions. Based on this, the evaluation method of anti overturning performance of medium and small span bridges under complex geological conditions is optimized. Combined with the characteristics of complex geological conditions, the structural characteristics of long-span bridges are analyzed. The calculation of bearing capacity of medium and small span bridges with longitudinal expansion joints is introduced, and the transverse anti overturning performance of adding steel beams at the top box girder of piers between bridges is evaluated So as to ensure the accuracy of anti overturning performance evaluation of medium and small span bridges.

Keywords: Bridge; Single pier; Overturning resistance