下承式双肋斜张拱桥侧倾稳定实用计算方法-《郑州大学学报(工学版)》

文章信息/Info

Title:: Practical Calculation Method for Lateral Stability of Two-ribsthrough Cable-stayed Arch Bridge

作者:: 艾永明; 黄平明; 杨炳成.; 长安大学,桥梁与隧道陕西省重点实验室,陕西,西安,710064, 长安大学,桥梁与隧道陕西省重点实验室,陕西,西安,710064, 长安大学,桥梁与隧道陕西省重点实验室,陕西,西安,710064

Author(s):: AI Yongming; HUANG Pingming; YANG Bingcheng; Key Laboratory for Bridge and Tunnel of Shanxi Province，Chang’an University，Xi’an 710064，China

Keywords:: cable—stayed arch bridge; lateral stability; critical load; non—directional load

摘要:: 考虑索和吊桥的非保向力效应,利用能量法对下承式平行双肋斜张拱桥的横向稳定问题进行分析,得到了斜张拱桥横向屈曲临界荷载的实用计算表达式.研究表明,索结构的索面大小、水平倾角、索张力大小及拱上锚固位置和拱结构的矢跨比、横撑在拱切向面内抗弯刚度、横撑数量等因素对结构横向稳定性能影响很大,而横撑在拱径向面内抗弯刚度和拱肋抗扭刚度、竖向抗弯刚度等因素的影响很小;考虑非保向力效应后,拉索使结构横向稳定性能有显著提高.

Abstract:: Considering the effect of non—directional load of cables and suspenders，the principle of the mini—mum potential energy is used to analyse the instability behavior in lateral of cable—stayed arch bridge，and apractical formula to determine the critical load of lateral stability of cable-arch structure is given．The resultshows that the size of cable—plane，level inclination，the size of cable tension，and the anchor position on archof the cable structure and rise-to—span ratio，the bending stiffness of crossbar in arch tangential plane and thequantity of crossbar of arch structure have obvious effect on the lateral stability，but the effect of the bendingstiffness of crossbar in arch radial plane．the torsional stiffness and vertieal bending stiffness of arch rib iSsmall．Considering the effect of non—directional load，cable can improve the lateral stability significantly．