基于拱肋截面承载力的拱轴系数优化探讨  

Discussion on Optimization of the Arch Axis Coefficient Based on the Bearing Capacity of the Arch Cross Section

作　　者：杨洋[1] YANG Yang(China Merchants Chongqing Communications Technology Research&Design Institute Co.,Ltd.,Chongqing 400067)

机构地区：[1]招商局重庆交通科研设计院有限公司,重庆400067

出　　处：《公路交通技术》2023年第3期90-95,共6页Technology of Highway and Transport

摘　　要：为改善拱桥拱轴系数的优化效果,提出一种基于压弯构件截面承载力的拱轴系数优化方法。先采用P-M曲线、弯矩和轴力计算各个拱肋截面的加载率,后通过优化拱肋截面加载率达到最小值来获取最优拱轴系数,由此建立了一种新的拱轴系数优化方法,并以某上承式钢筋混凝土拱桥为例,采用该方法优化拱轴系数。计算及应用结果表明:1)空腹式拱桥的恒载分布较均匀,其拱轴系数一般不超过2;2)拱圈的矢高越大,拱肋的轴力越小;3)以拱肋截面的加载率优化拱轴系数,考虑了轴力和弯矩的共同作用。In order to improve the optimization effect of the arch axis coefficient,an optimization method of the arch axis coefficient based on the section bearing capacity of compression bending members is proposed.The P-M curve,bending moment and axial force are first used to calculate the loading rate of each arch section,and then the optimal arch axis coefficient is obtained by optimizing the loading rate of each arch section to the minimum value.A new method for optimizing the arch axis coefficient is established,which is used to optimize a"deck"type reinforced concrete arch bridge as an example.The results of calculation and application show that the dead load distribution of open-web arch bridge is uniform,and its arch axis coefficient is generally less than 2.The greater the rise of arch,the smaller the axial force of arch section.The arch axis coefficient is optimized by the loading rate of arch section,and the joint action of axial force and bending moment is considered.

关 键 词：桥梁工程 拱桥 拱轴系数 P-M曲线 优化 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]