THE EVALUATION METHODS ON THE EXISTING SINGLE-SPAN HIGHWAY ARCH BRIDGE

摘要

In the Code for Maintenance of Highway Bridge and Culvers, the whole bridge is divided into 17 components and the weight to each one is recommended and given in a table. But when coming to the inspection and the assessment of the existing single–span highway bridges, the recommended weight to each member can’t be used directly, because in the single-span arch bridge there are no components such as the piers, the bearing etc. So the weight has to be adjusted and redistributed in the existing components again to be available to the need in evaluation. Here, several methods were recommended. The first method takes advantage of the hierarchy-weight evaluation method in the code CJJ-2003, the weight proportion of the same part in the two codes is found after the virtual layers was set up corresponding to the layers in CJJ-2003, the final index of the single-span bridge is found by the virtue of the valuation thought in the assessment on the substructure and the proportion transfer. The two other methods based on the weight redistribution easily operated were given also. One is to keep the ration of each assemble fixed but to adjust the proportion of each component in the same assembly, the other is to adjust the weight in the whole structure.