大跨度短撑杆式张弦桁架结构的外形对受力性能的影响分析

短撑杆式张弦桁架是用短撑杆连接梭形桁架梁与体外拉索形成的自平衡结构,是近几年研发的新型张弦结构体系之一.本文简要介绍了该新结构的特点和优点,采用有限元法对120 m大跨度短撑杆式张弦桁架结构进行分析,详细讨论了矢跨比、垂跨比和撑杆数目等参数对结构受力性能的影响.分析表明,矢跨比的增大提高了结构刚度,改善了结构的变形和受...

Analysis of the Impact of the Span Short Rod-type Truss String Structure Shape on Mechanical Behavior

Short-rod-style string truss is a self-balancing structure which connects the spindle-shape truss with external cable by short rod.It’s one of the new string structural systems studied in recent years.This paper introduces the characteristics and advantages of the new structure,analyzes the 120 m span short truss rod-type string by finite element method and discusses the effect of span ratio,sag ration and the number of pole on mechanical properties of the structure.The analysis shows that the increase of Span ratio could enhance the structural stiffness and improve the deformation and stress of the structure.The proposed span ratio is 0.08-0.12.The increase of sag ration could improve stress distribution,and the proposed sag ratio is not less than 0.08.The number of pole has no much effect on the static performance of the structure,and the proposed number is 4-8.This conclusion can provide reference for the similar engineering.