从超大跨径桥梁结构的两种基本体系（斜拉桥与悬索吊桥）入手，回顾了本领域理论研究现状，并揭示了超大跨径桥梁所面临的诸多丞待的特殊力学难点及可靠的对策。分析表明，超大跨径斜拉桥力学难点及可行的对策。分析表明，超大跨径斜拉桥力学难点在于静力稳定性问题，超大跨径悬索桥主要是风载下的空气静力、空气动力稳定性问题。

In this work, the aerodynamic stability of the Yichang, Suspension Bridge over Yangtze River druing erection was determined by three-dimensional nonlinear flutter analysis, in which the nonlinearities of structural dynamic characteristics and aeroelastic forces caused by large deformatin are fully considered. An interesting restlt obtained was that the bridge was more stable when the siffening girders were erected in a non-ymmetical manner as opposed to the traditional symmetrical erection schedule. It was also found that the severe decrease in the aerodynamic stability was due to the nonlinear effects. Therefore, the nonlinear factors should be considered accurately in aerodynamic sta ility analysis of long-span suspension bridges during erection.

20世纪中发生了两次世界大战，使人类文明遭到了惨重的破坏，但世界各国人民在战后为重建家园，恢复生产而大兴土木的建设中，桥梁工程也取得了辉煌的成就。而中国桥梁在20世纪最后20后所取得的进步更令世界桥梁惊叹不已。在这一成就的鼓舞下，一些发达国家开始构思在21世纪建设更加宏伟的跨海工程。中国在21世纪也有宏伟的交通建设规划，基中包括沿太平洋海岸公路上的跨海工程。可以预料：北欧，日本和中国将是21世纪上半叶世界桥梁工程建设的热点。中国的桥梁工和者要承认差距，不甘落后，坚持自主设计和建设者的原则，为21世纪跨海工程中的技术难点做好准备，争取创造出更好的业绩，使中国成为世界桥梁强国的重要一员，重现在中国古代桥梁的辉煌。