Research on Loading Test Scheme of Vehicular Bridge-Footbridge Combined Double-Deck Cable-Stayed Bridges

In order to check whether the bridge structure is in good working condition, meeting the requirements of carrying capacity and traffic capacity, loading test should be conducted to the Huiketing No.1 Bridge in Mianyang city. The bridge is a double-deck cable-stayed bridge, the upper deck of which works as a footbridge and is connected by 6 chain poles to the lower deck which works as a vehicular bridge. Since the bridge structure is novel, the working stress state is complicated and the coupling effect of the two decks is notable, little referential experience could be found from other bridges. The loading test uses sandbags as equivalent to pedestrian loads on the footbridge and adopts heavy trucks to imitate the design vehicle loads on the vehicular bridge. According to the structural symmetry of the whole bridge and the analysis of its static and dynamic performances in the finite element software, the optimized loading project is finalized. Test methods and analysis results of this footbridge can be used as reference in loading test of similar bridges in the future.