Research On The Strengthening Methods Of Double-Curved Arch Bridge

With the rapid economic development and advanced the reform and opening up program, the traffic volume of GuangXi Province has increased rapidly. It's accelerated the damage of the bridges . More and more bridges must be increased the technique grades . For resuming the carrying capacity , extending the service life and upgrading the technique grade , it's necessary to repair and rehabilitate the existence bridges which has been damaged seriously or can't adapt the traffic development.The typical diseases , modeling technologies and strengthening methods are researched for the double-curved arch bridges. Combining with the strengthening project ShuiWen Bridge of GuangXi Province , firstly , the finite element model has been build up and the theoretic bridge capacity has been analyzed which used actual survey data . Secondly , by the results of the static-dynamic load testing , update the finite element model and evaluate bearing capacity of the exisent bridge .Thirdly, according to mechanical behaviors of the existed bridges , the box-arch transforming program is adopted . The strengthen method is designed with adopting the arch axis pressure lines and transforming the arch ring to box-arch . Finally, With the stress superposition theory, the paper also analyzes the stress states of main arch ring during the whole construction and operation . At the same time , it analyzes the bridge capacity based on the code .