Design of Large-Span Steel-Truss Girder Railway Bridge Stiffened by Flexible Arch Rib

Hongqili Bridge in Nansha Port Railway located at an offshore cyclone affected district is composed of a flexible arch bridge of steel truss girder, with a main span of 2 × 360 m. It has the longest span and largest scale of construction among similar bridges so far. The Bridge has the characteristics of complex structure and difficult construction, which is a great challenge for design and erection. Structure deformation and its stiffness are the critical considerations of the working safety and comfort of railway Bridges. For a large span flexible arch bridge of steel truss girder, the structure stability is the key study item in the design. Based on the introduction to the design and the construction technology of Hongqili Bridge, structure stiffness and its stability analysis is applied in the study. The analysis conclusion shows that the combined structure of rigid truss girder and flexible arch rib has high stiffness, good bearing capacity, stable performance meeting the design requirements and enough safety margin.