Design and Calculation of Superstructure of Main Bridge of Yandangshan Bridge

The Yandangshan Bridge is a continuous composite steel box arch bridge structure.The main girder of the structure has 2×90-m spans continuous steel box girder and the main arch of a span has two parallel steel box arch ribs with the designed arch rise being 18.00 m.In the 2 spans of the main steel box arches,the auxiliary steel box arch was arranged.The combined cross bracings of 7 straight bracings and 2 X-shape bracings were respectively arranged between the main arch ribs of each span and 8 straight cross bracings were arranged between the auxiliary arch ribs.For the main arch of each span,13 pairs of the hangers were arranged.The software ANSYS was used to set up the finite element model for the whole bridge,the force conditions of the structure and the local force conditions of the arch springs under the action of different loads were analyzed.The results of the analysis show that the load-carrying capacity,rigidity and local stress of the bridge can all meet the relevant requirements in the codes.