主跨40 m跨座式单轨交通连续钢箱轨道梁优化设计  

Optimal Design on Continuous Steel Box Track Beam for 40 m Main Span Straddle-type Monorail Transit

作　　者：董艳彪 刘世忠[1] 王冠军 魏源 DONG Yanbiao;LIU Shizhong;WANG Guanjun;WEI Yuan(Key Laboratory of Road Bridge and Underground Engineering of Gansu Province,Lanzhou Jiaotong University, Lanzhou Gansu 730070,China;Lin Tongyan International Engineering Consulting(China)Co.Ltd., Chongqing 401120,China)

机构地区：[1]兰州交通大学甘肃省道路桥梁与地下工程重点实验室,甘肃兰州730070 [2]林同棪国际工程咨询(中国)有限公司,重庆401120

出　　处：《铁道建筑》2018年第8期14-18,共5页Railway Engineering

基　　金：国家自然科学基金(51568036)

摘　　要：以某市云轨示范线一主跨40 m连续钢箱轨道梁为工程背景,利用直接网格搜索法原理,采用双变量优化设计法,应用有限元软件ANSYS计算分析所选结构体系的力学特性。以梁高、边跨与中跨比为设计变量,以主梁挠度、竖向基频、梁端转角、应力为约束条件对结构进行优化,确定使结构材料用量最少的最优结构体系。研究结果表明,梁高为2.4 m、边跨与中跨比为0.6是最优方案。该方案的结构受力及变形更加合理,最大限度地发挥了材料的作用,且施工难度较小,施工周期较短。By taking a continuous steel box track beam with a 40 m main span on a cloud rail demonstration line as the engineering background,and using the direct grid search method and dual variables optimization design method,and applying the f inite element software ANSYS,the mechanical characteristics of the continuous steel box track beam structure were simulated and analyzed.Through selecting the beam height and the side/middle span ratio as design variables,and setting main span def lection,vertical fundamental frequency,beam end angle and stress as constrain conditions,the optimal structure system with the least amount of materials was studied and determined.The results show that the optimal recommended scheme was that the beam height is 2.4 m and the side/middle span ratio is 0.6.This scheme is reasonable in stress and deformation,and thus maximumly utilizes the materials properties.It also reduces construction diff iculty and period.

关 键 词：轨道交通 优化设计 连续钢箱轨道梁 双变量优化设计法 ANSYS 

分 类 号：U441[建筑科学—桥梁与隧道工程]