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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.

Quanzhou Bay Railway Bridge is the key component of the Fuzhou-Xiamen High-Speed Railway with the design speed of 350 km/h. The total length of 20.3 km is the greatest among the sea- crossing high-speed railway bridges in the world. The main structure over the main navigation channel is a steel-concrete composite cable-stayed bridge with the span arrangement of（ 70+130+400+130+70）m. The main girder adopts a closed and streamlined box section.In the past decades, the sea-crossing railway cable-stayed bridges mostly adopted steel truss girder. Quanzhou Bay Railway Bridge is the first railway bridge adopting the steel-concrete composite box girder cable-stayed bridge type in china and the longest-span sea-crossing high- speed railway bridge in the world. In this paper, the structural design and construction method for this bridge are presented.