The Research Of Anti-overturning And Structural-reinforcement Analysis On A Girder Bridge With Single Pedestal Piers

Single column pier bridge with its own advantages have become the best choice forfreeway interchange ramp bridge and urban elevated overpass construction program. In thepast due to lack of design theory, this has led to the emergence of multi-column pier girderbridge from the whole body alone overturning rollover accident. At present, many provincesin the country to carry out the single column pier bridge stability against overturninginspection, and worked for the need reinforcement of bridge. In this context, anti overturninganalysis and reinforcement countermeasures for single column pier of the bridge has strongpractical engineering value.Subject to the Beijing-Hong Kong-Macao highway certain section of single column pierdetection project, the paper analysis against overturning performance and strengtheningcountermeasures of the single column piers bridge.1. Relying on practical projects, the paper by setting different radii of curvature, differentpre-eccentric bearing dual bearing spacing and different statistical, then, analyzes andsummarizes the impact of these factors on the stability against overturning single column ofbridge piers. The study showed that the single column pier straight bridges and with largerradius of curvature of the single column pier bridge prone bearing void even structureoverturning accident. Set a reasonable single bearing eccentric and double bearing spacing isvery favorable to improve overturning stability of the bridge structure. In addition, the singlecolumn pier girder bridge under the condition of the serious overload, the possibility of bridgebearing escapes and even the upper structure overthrow will increase greatly.2. By bearing void simulations, found that bearing void has the greater impact oninternal forces of the main beam. After supports void, the moment of main beam section havevarying degrees of increasing, and the internal forces of main beam cross-section of each spanis significantly increased much greater than the pivot section. In addition, with the bearingvoid, the same fulcrum reaction force will be re-distributed. When a bearing separation, itssame row adjacent reaction force will rapidly increase. 3. The paper select two single column pier bridges, respectively, using the creation of anadditional pier cap beam method and the method of its resistance to overturning reinforcementanalysis. Analysis shows that the new cap beam can add on a single column pier side, and canalso add symmetrically on both sides. The addition of the cap beam has a smaller impact onbridge traffic, but it needs high resistance performance requirements for the original singlecolumn pier. If the original piers have large carrying capacity, we can add columns on bothsides of the single column pier. Which way to be used for reinforced concrete, it is inconjunction with many considering the characteristics of the bridge as well as the force ofeconomic rationality, etc., then select an optimal solution.