三榀拱肋组合系杆拱桥面外稳定性分析  

External Stability Analysis of Three Arch Rib Composite Tied Arch Bridge Decks

作　　者：金成棣[1] 令狐云云 赵天麟 JIN Chengdi;LINGHU Yunyun;ZHAO Tianlin

机构地区：[1]同济大学,上海200092 [2]上海兰德公路工程咨询设计有限公司,上海200072

出　　处：《上海公路》2021年第2期41-45,M0004,共6页Shanghai Highways

摘　　要：系杆拱宽桥横断面布置三榀拱肋,其间设置框架式联结系。拱肋面外稳定性按组合柱理论分析,将拱肋作为拉直曲杆的中心受压柱。引进拱肋组合效应系数,考虑了拱肋局部及横系梁的剪弯影响,在拱肋三者不同的刚度条件下,得出了相应的效应系数。在此基础上,按差分法解出拱轴力对横向挠度所引起的偏心矩,由它引起挠度曲线率变化的微分方程,得到跨中挠度及相应的临界水平力。按我国桥规的相关规定,根据三榀拱肋的结构特点,用综合刚度法确定组合拱相应的长细比,进行刚度及承载力的验算。通过实例说明所提供的验算公式的可行性。Three arch ribs were arranged in the cross section of tied arch bridge,and a frame connection system was set between them.The out-of-plane stability of arch ribs was analyzed according to the theory of composite column,and the arch rib was used as the central compression column of the straightening rod.The combined effect coefficient of arch ribs was introduced,and the shear-bending effects of local arch ribs and transverse beams were considered.The corresponding effect coefficients were obtained under different stiffness conditions of arch ribs.On this basis,the differential equation of the deflection curve rate change caused by the eccentric moment from the arch axis force on the lateral deflection was solved by the difference method.Mid-span and the corresponding critical horizontal force were obtained.According to the relevant provisions of China’s bridge code and the structural characteristics of three arch ribs,the corresponding slenderness ratio of composite arch was determined by the comprehensive stiffness method,and the stiffness and bearing capacity were checked.The feasibility of the calculation formula was illustrated by an example.

关 键 词：框架式系杆拱联结系 组合效应系数 综合惯性矩 

分 类 号：U448.225[建筑科学—桥梁与隧道工程]