Research on the stress transfer mechanisms of joint structures in hybrid truss bridges

In recent years, hybrid truss bridges with upper and lower concrete slabs joined by steel diagonals have been attracting attention. In hybrid truss bridges, the structure of joints, which connect the different materials of the steel diagonals and concrete slabs, is extremely important. In the past, the authors have further expanded the merits of existing hybrid truss bridges, and as a new form with excellent economic and construction efficiency, propose a new hybrid truss bridge in which the upper member is a composite structure of steel and concrete. Here, a new non-embedded-type steel diagonal joint structure, which is relatively simple and has high construction efficiency, is the proposed. Through a model loading test, stress transfer mechanisms and safety were confirmed. In this paper, a model loading test is reviewed with the rational design of the proposed joint construction in mind, and furthermore, the results of 3-D FEM analysis based on the loading test are presented.