中文摘要：

收集大量钢管混凝土哑铃形截面拱桥资料,对影响该类拱桥面外稳定的主要参素进行统计分析,参考实际桥例,构建既符合工程实际、又有代表性的哑铃形截面标准拱,并以标准拱为对象,进行面外弹性稳定的参数分析.结果表明：哑铃形拱的弹性稳定系数随着矢跨比增大而先增大后减小,在矢跨比为0.22~0.25时达到峰值;与钢管混凝土单圆管拱相似,哑铃形拱的面外稳定性随着宽跨比增大而先增大后减小;横撑布设形式不仅影响哑铃形拱弹性稳定系数,还会影响面外失稳模态;拱顶横撑对面外稳定性影响较小、边横撑影响较大;适当增大拱肋钢管直径,可有效提高哑铃形拱面外稳定性,增加截面高度对其面外稳定性的提高幅度很小;拱弹性稳定系数随着桥面刚度增大而增大,但桥面刚度超过一定值后,哑铃形拱的面外稳定性增速变缓.

英文摘要：

Information of concrete-filled steel tube（ CFST） dumbbell-shaped rib arch bridge was investigated.Main influencing factors of out-of-plane stability of this kind of arch bridge were statistically analyzed. A standard dumbbell-shaped rib arch which could be representatively in accordance with engineering practice was built by referring to real bridges. The parameter analysis was conducted on this standard arch. The results show that coefficient of elastic stability increases firstly and then decreases while the rise-span ratio increases.When the rise-span ratio is in the range from 0. 22 to 0. 25,the coefficient of elastic stability of dumbbellshaped arch bridge reaches the peak. The influence of the width-span ratio of arch is similar to the rise-span ratio. Brace form not only affects the stability coefficient of arch,but also affects the out-of-plane instability mode. The top brace has greater effect on elastic stability than side braces. Enlarging the diameter of steel pipe can effectively improve the out-of-plane stability of dumbbell-shaped arch,but enlarging the section height of arch rib could only slightly improve the out-of-plane stability. Then coefficient of elastic stability of arch will enlarge with the increase of deck stiffness,but there is a reasonable value interval of deck stiffness.While exceeding this interval,the coefficient increases slowly.