中等跨径钢板组合梁截面布置优化  

Optimization of section layout of steel plate composite beam with medium span

作　　者：李立峰[1] 侯坤 邹德强 彭浩 李凌霄 LI Lifeng;HOU Kun;ZOU Deqiang;PENG Hao;LI Lingxiao(College of Civil Engineering,Hunan University,Changsha 410082,China;China Construction Fifth Engineering Bureau Co.Ltd,Changsha 410004,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]中国建筑第五工程局有限公司,湖南长沙410004

出　　处：《浙江大学学报（工学版）》2024年第3期510-517,共8页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(51978257,52278176);中建五局科技研发计划资助项目(cscec5b-2020-17);云交科教[2017]17号资助项目。

摘　　要：为了实现钢板组合梁的标准化设计,达到进一步推广应用的目的,以跨径30 m的先简支后桥面连续钢板组合梁桥为研究对象,结合目前中国钢-混组合梁桥的设计规范,以全桥造价及全桥钢材用量为目标函数,以钢板组合梁截面尺寸布置参数和主梁数量为设计变量,并以应力、变形、局部稳定和规范构造要求为约束条件,建立钢板组合梁截面参数的优化模型,并采用遗传算法展开优化分析.优化结果表明:所提算法稳定可靠、效率高,依托工程的结构截面布置有较大的优化空间.当桥宽和车道布置不变时,采用6梁式截面的全桥造价最少,相对原始设计截面可节省约13%的费用;采用4梁式截面的全桥钢材用量最少,为128.65 kg/m^(2),相对原始设计截面可节省约27%的钢材用量.优化结果可为中等跨径钢板组合梁桥的截面设计提供参考.通过经济性分析发现,当主梁间距分别取约2.3、3.2、4.8 m时,跨高比的经济取值分别为20~23、18~21、14~17.A 30 m span simply supported steel plate composite girder bridge with continuous deck was taken as the research object,in order to realize the standardized design of steel plate composite girder and achieve the purpose of further popularization and application.The current design code of steel plate composite girder bridge in China was combined,the cost of bridge and the steel consumption were taken as the objective function,the dimension layout parameters and the number of main beam were taken as the design variables,and the stress,deformation,local stability as well as standard construction requirements were taken as the constraint conditions.The optimization model of the section parameters of the composite steel plate girder was established based on the above conditions,and the genetic algorithm was used for optimization analysis.The optimization results showed that the proposed algorithm was stable,reliable and efficient,and there was a large space for optimization,depending on the structure section layout of the project.Under the condition of keeping the width of the bridge and the layout of the driveway unchanged,the cost of using the six-beam section was the least,which was reduced by about 13%compared with that of the original design.The steel consumption with four-beam section was the least,123.69 kg/m^(2),and about 27%of the steel consumption was saved compared with the original design.The optimization results can provide reference for the section design of medium span steel plate composite bridge.Economic analysis showed that,the economic values of the span height ratio of the section were 20−23,18−21,14−17,respectively,when the main beam spacing was about 2.3 m,3.2 m and 4.8 m.

关 键 词：城市桥梁 截面优化 经济性优化 钢板组合梁 遗传算法 

分 类 号：U443.35[建筑科学—桥梁与隧道工程]