Segmental Model Test of a Sunflower Arch Bridge and Joint Optimal Design

A 1:5 scaled segmental model test of a sunflower arch bridge was performed to explore the stress and displacement responses of this new type of arch bridge. Displacement and stress at key sections of the model were measured. The measured stresses of the concrete showed that the maximum tensile stress under a dead load at the end of the spandrel arch was larger than the tensile strength of the concrete, which means cracks will occur in these regions. To avoid cracks an optimized design of the joint was proposed in which I-section steel beams were used to replace the concrete at the end of the spandrel arch. Through a comprehensive parametric analysis using the experiment verified finite element model, effect of number, length and flange thickness of I-section steel beams on the displacement and stress responses of the model were obtained. Finally, optimized geometrical dimensions, number and length of the I-section steel beams were suggested.