中承式提篮拱桥拱肋最优内倾角取值影响分析

Analysis of the optimal inward angle affecting of the arch rib of the semi bearing basket-like arch bridge

为研究最优内倾角与拱桥构造的矢跨比、宽跨比、横撑数量等参数之间的关系,以某中承式哑铃形提篮拱桥为工程背景,建立三维有限元精细化模型。考虑几何非线性因素,计算不同构造条件下的稳定安全系数。根据安全系数的变化规律,分析中承式提篮拱桥不同构造参数对最优内倾角取值的影响。研究结果表明:最优内倾角的取值与矢跨比呈负相关,与宽跨比呈正相关,而与横撑数量的相关性不明显。该结论可为类似提篮拱桥工程内倾角的确定提供借鉴。

In order to investigate the relationship between the optimal inclination angle and the parameters such as rise-span ratio,width-span ratio and transverse brace of arch bridge structure,a refined spatial finite element model was established based on a mid-through dumbbell-shaped basketcarrying arch bridge.Considering the geometric nonlinear factors,the stability safety factor under various structural conditions were calculated.The influence of structural parameters of the semi-bearing basket-like arch bridge on the optimal inclination angle was studied according to the change law of the safety factor.The results found that the value of the optimal inclination angle is negatively correlated with the rise-span ratio,positively correlated with the width-span ratio,and has ting correlation with the number of cross braces.The research can provide a useful reference for the determination of the inclination angle of similar basket-carrying arch bridge.