大跨径拱桥的发展

介绍大跨径混凝土拱桥的发展概况。提出理论极限跨径与理论可行跨径的概念,给出混凝土拱桥和钢拱桥的理论可行跨径。最后以克罗地亚新建的克尔卡桥为原型,提出了钢-混凝土组合桁式拱新型结构,在与混凝土拱和钢桁拱的比较中可以发现,钢-混凝土组合桁式拱在结构性能、经济性能上具有一定的优越性,值得进一步的研究。

Development of Long Span Arch Bridges

This paper gives a summarized account of development of long span concrete arch bridges,puts forward the conception of both the theoretic ultimate and theoretic feasible span length of arch bridges and specifically,provides the theoretic feasible span length respectively for the concrete and steel arch bridges.Taking the newly-built Krka Bridge in Croatia as the proto- type,the paper also proposes a type of new structure of steel and concrete composite truss arch. It is found in the comparison of the structure with only the concrete arch and steel truss arch,the structure of the steel and concrete composite truss arch has certain advantages in aspects of its structural performance,economy and the structure is a one that deserves research in a further way.