倒梁法模型下的锚索框架梁最优跨径研究  

Study on the Optimal Span of Anchor Cable Frame Beams using Inverted Beam Model

作　　者：马康 彭小勇[1] MA Kang;PENG Xiaoyong(Guizhou Transportation Planning Survey and Design Academe Corporation Limited,Guiyang 550081,China)

机构地区：[1]贵州省交通规划勘察设计研究院股份有限公司,贵阳550081

出　　处：《交通科技》2022年第4期29-33,共5页Transportation Science & Technology

摘　　要：以六孔锚索框架为例,采用连续梁倒梁法,通过调整梁的跨径而优化结构内力,计算推导出可直接用于结构设计的内力计算公式,并讨论支座反力修正误差值的控制和框架梁的相对最优跨径比,推导支座反力修正后的横、竖梁的控制性截面内力计算公式。结果表明,当框架梁悬臂长度与跨径长度的比值n存在“竖梁n=0.3891,横梁n=0.3536”关系时,梁内力分配最合理,结构最优。将桥梁上的最优跨径运用于锚索框架梁,得出优化设计的思路和方案。In order to optimize the design work,taking a six-way frame as an example and using inverted beam model,the internal force of the structure is optimized by changing the span of beams.Parameterized calculation formulas of internal force of the frame beam that can be directly used for structural design are derived.Simultaneously,the control of correction error of bearing reaction force and the relative optimal span ratio of frame beams are discussed.The internal force calculation formulas of the control section of the horizontal and vertical beams after the support reaction correction are derived.The results show that when the ratio n between the cantilever length and the span length of the frame beam follows the relationship of“vertical beam with n of 0.3891,horizontal beam with n of 0.3536”,the internal force distribution of the frame beam is the most reasonable and the structure is optimized.The concept of the optimal span in bridge engineering is applied to anchor cable frame beam,meanwhile the idea and scheme of optimizing frame structure design are obtained.

关 键 词：岩土工程 锚索框架 倒梁法 内力计算 最优梁跨 

分 类 号：U416.12[交通运输工程—道路与铁道工程]