丹东月亮岛大桥稳定性分析

丹东月亮岛大桥是宽跨比为1／22．44的下承式钢管混凝土系杆拱桥，采用单片桁架式X形拱肋，利用桥面板内张拉钢铰线作为拱的系杆，以实际工程为背景，通过空间有限元法对其稳定性进行了研究，结果表明：拱肋的最优内倾角度与横撑的刚度、型式和布置位置等因素有关，最终与拱的整体横向刚度有关；在满足行车净空的要求下K撑应该尽量靠近拱脚位置，其对拱桥的横向稳定性起到比较重要的作用。

Stability analysis of Dandong Moon Island Bridge

Dandong Moon Island Bridge is a through concrete-filled steel tubular(CFST) X type tie arch bridge with ratio of width of deck to span 1/22.44.The section of the arch ribs adopts monolithic truss type,and the tie bar adopts the deck of the bridge.Based on practical engineering,the stability of the structure is researched by the finite-element method.The results show that the optimal inclinated angle of ribs is related to the stiffness,structure type and layout of lateral braces.And it is related to the integral lateral stiffness of arch bridge. Under the condition of meeting the requirements of the vertical clearance of vehicular traffic,it is more effective that K-shaped lateral braces are located as close as possible to the arch spring.