Model Experimental Study Of Multi-Span Tied Arch Bridge

Half-through tied arch bridge is quite popular in the city construction because of the elegant appearance and large spanning capacity. The type of multi-span arched bridge is not very common in China, which leads to the lack of examples for reference.The sea-crossing bridge in Dalian, Puwan new district is a five-span tied arch bridge with a total length of640meters, using steel box basket handle arch rib. Based on this actual project, using model test associated with finite element analysis, this paper studied the overall structure characteristics of multi-span tied arch bridge and provided more reference ion for construction and future design work. The main work of this paper includes the following parts:(1) Briefly introduced the similarity theory of model test. And determined the reduced scale and materials of the model. Considering the conditions of the laboratory and the purposes of experiment, a1:30scale model with5052-H32aluminum plate has been made. The section dimensions of arch rib and edge main girder were determined based on the similarity of geometry and stiffness. The model was assembled with a combination of rivets and welding.(2) A five-span tied arch bridge finite element model was established with Midas/Civil software, calculating the stress in arch rib, main girder, suspender as well as tie bar, under gravity load, secondary load and traffic live load. The results show that the strength and stiffness of the components were all within allowable range, and the maximum bending moment was found at the arch foot. And established a1:30scale model with5052-H32aluminum plate in Midas/Civil software, simulating the10load conditions in the static load test, then calculated the stress and displacement of the model in every load condition.(3) Designed and conducted a static test, observed and recorded the test results, comparing the theoretical values with measured values for error analysis. During the test, there was no global or partial instability and damage in the model, indicating the stress of each component of the bridge were within safe limits; The displacement and stress of the real bridge deduced from the test results were also within safe limits, indicating that the design was reasonable and can be put into construction.