基于最优化理论的下承式拱桥的吊杆索力优化  

Cable force optimization of through arch bridge based on optimization theory

作　　者：彭涛 PENG Tao(Hunan Lianzhi Technology Co.,Ltd.,Changsha 410200,Hunan,China)

机构地区：[1]湖南联智科技股份有限公司,湖南长沙410200

出　　处：《工程建设》2021年第3期42-44,69,共4页Engineering Construction

摘　　要：为探究吊杆拱张拉力的优化方法,本文以某下承式拱桥为研究对象,设置合理的目标函数及约束条件,建立基于应力控制指标的数学优化模型,对吊杆张拉力进行优化。结果表明:基于全局最优算法的迭代程序可有效解决索力求解问题,拱肋应力、主梁应力及下挠结果均有不同程度减小,其中拱肋最大拉应力由优化前的1.96 MPa降至1.68 MPa,主梁跨中位置最大拉应力由1.35 MPa降至1.18 MPa;主梁跨中竖向变形最大减小量为9.7 mm。In order to explore the optimization method of boom tensile force,a through arch bridge is taken as the research object,reasonable objective function and constraint conditions are set,and a mathematical optimization model based on stress control indicators is established to optimize the boom tensile force.The results show that the iterative program based on the global optimal algorithm can effectively solve the problem of cable force,and the arch rib stress,main girder stress and deflection results are reduced to varying degrees,and the maximum tensile stress of the arch rib is reduced from 1.96 MPa before optimization to 1.68 MPa,the maximum tensile stress at the mid-span position of the main beam is reduced from 1.35 MPa to 1.18 MPa;the maximum reduction in the vertical deformation of the main beam mid-span is 9.7 mm.

关 键 词：下承式拱桥 吊杆张拉力 优化 拱肋应力 主梁应力 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]