厦门海沧大桥悬索桥结构体系的选择

厦门海沧大桥东航道桥采用三跨连续漂浮体系悬索桥结构，是世界第三座、国内第一座这种体系的结构。本文利用空间有限位移理论，对该桥的三跨连续漂浮体系、三跨两铰结构体系和三跨连续支承体系3种方案进行静力与动力计算，通过比较3种体系的静力与动力特性，说明三跨连续漂浮体系加劲梁桥塔区的弯矩比三跨连续支承体系的小得多，与三跨两铰体系的最大弯矩相当；在结构变形方面，漂浮体系与连续支承体系相当，比三跨两铰体系小得多；在动力特性方面，三跨连续漂浮体系同样具有较多的优越性。

Selection of Structure System for Haicang Suspension Bridge in Xiamen City

The bridge over east navigable channel of Xiamen Haicang Link is a suspension bridge with 3 span and floatable system, which is applied first time in China and third time in the world Both static and dynamic analysis for three options of structure system (option A: 3 span and floatable system, option B: 3 span and two hinged support system, option C: 3 span and continuous support system) are carried out in this paper by means of finite displacement theory As a result of the comparison of static and dynamic characters of three options, the bending moment of stiffening girder near pylons of option A is much less than option C and corresponds to maximum of option B, the structure deformation of option A is much less than option B and corresponds to option C, the option A also has more advantages than other options in dynamic characters