单吊点、无风撑梁拱组合体系桥梁受力特性分析  

Analysis of Force of Single Suspension Point and No-wind Braced Beam-Arch Combination Bridges

作　　者：袁卫兵 Yuan Weibing(Beijing Guodaotong Highway Design and Research Institute Co.,Ltd.,Beijing 100161,China)

机构地区：[1]北京国道通公路设计研究院股份有限公司,北京100161

出　　处：《市政技术》2024年第9期26-31,共6页Journal of Municipal Technology

摘　　要：单吊点、无风撑梁拱组合体系桥梁造型新颖,但与常规梁拱组合体系桥梁相比,其受力存在差异,拱肋面外稳定问题突出。因此,研究了在恒载作用下的矢跨比、拱轴线、拱梁刚度比和吊杆倾角4个结构设计参数对结构内力和拱肋面外稳定性的影响,得出的结论是:大矢跨比可以降低拱肋轴力、提高面外稳定性,有效降低拱脚弯矩,但会增大拱顶弯矩;直线型的拱轴线可以更好地贴近于压力线,拱肋受力形式表现为轴压,但其面外屈曲系数有所降低;拱梁刚度比越大,拱顶承担荷载能力就越强,可以降低拱脚弯矩,并提升拱肋稳定性;较大的吊杆夹角可以改善拱肋的受力和面外稳定性。最后,针对各项参数的取值给出了建议,可供类似工程设计参考。The single suspension point and no-wind braced beam-arch combination bridge is novel.Compared with conventional beam-arch combination system bridges,there are force differences and prominent problem of out of plane stability of arch ribs.The influence of four structural design parameters,namely the rise span ratio,arch axis,arch beam stiffness ratio and boom topping angle on the internal force and out of plane stability of arch ribs under constant load are studied.It is found that a large rise span ratio can reduce the axial force of the arch rib,improve out of plane stability,effectively reduce the bending moment at the arch foot,but increase the bending moment at the arch crown;The straight arch axis is closer to the pressure line,and the arch ribs are subjected to axial compression,but the out of plane buckling coefficient is reduced;The greater the stiffness ratio of the arch beam,the stronger the load bearing capacity of the arch crown,which can reduce the bending moment at the arch foot and improve the stability of the arch ribs;A larger boom topping angel can improve the stress and out of plane stability of the arch ribs.Finally,suggestions are given for the selection of various parameters and reference for similar engineering designs.

关 键 词：单吊点 无风撑 矢跨比 拱轴线 拱梁刚度比 吊杆夹角 

分 类 号：U441.2[建筑科学—桥梁与隧道工程] U448.22[交通运输工程—道路与铁道工程]