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Abstract:The mobility-led model of urban development has caused serious urban problems, and more attention has been paid to walkable city gradually. It systematically reviews the development process of walkable city, and points out the value of the construction of the walkable cities, then puts forward active intervention strategies from the level of urban and regional, community and street in the perspective of urban planning. Finally, it suggests to strengthen interdisciplinary cooperation, make policies and regulations and enhance the quality of education to build walkable cities. 关键词 ： 可步行城市 ；城市规划 ；主动式干预 ；策略

Dedicated to Dipl.‐Ing. Dr.‐Ing. E.h. Reiner Saul on the occasion of his 80th birthday This paper describes the selection of box girders for cable‐supported railroad bridges from the point view of structural behaviour, fabrication, transportation and erection. There is a review of the use of wide single box girders and vented box girders with dual and triple separate boxes. The number of cable planes and the different transverse locations of pylon legs and main girders are also studied. A cable‐stayed bridge with a main span of 520 m and a triple separate box girder accommodating four high‐speed railway tracks and a six‐lane carriageway is researched as a case study. The result reveals that the triple separate box girder is very suitable for long‐span cable‐supported railroad bridges with multiple railway tracks and traffic lanes.