鼓蜂窝四撑杆Ⅲ型索穹顶结构静力性能分析

Static Performance Analysis of the Drum-Shaped Honeycomb-Type Ⅲ Cable Dome with Quad-Strut Layout

鼓蜂窝四撑杆型索穹顶抛弃传统概念,结合了多撑杆构思,是构形最为丰富的一类索穹顶结构。为研究新型鼓蜂窝四撑杆Ⅲ型索穹顶结构静力性能,选取下弦节点布置方案1,建立跨度为120 m的有限元数值分析模型,研究该结构在不同荷载水平及分布方式下的变形和内力变化。并进一步对结构进行参数化分析,研究包括初始预应力水平、矢跨比、撑杆高度(厚跨比)及下弦节点布置方案等不同参数对于结构整体刚度与承载力的影响及变化规律。分析结果表明鼓蜂窝四撑杆Ⅲ型索穹顶具有良好的结构性能,各索杆均不容易发生破坏,结构整体刚度大。研究中给出了初始预应力水平与相关几何参数的合理取值范围,可为该结构索穹顶的实际工程设计与应用提供参考。

The drum-shaped honeycomb-type Ⅲ cable dome is the most versatile type of cable dome structure in terms of configuration,as the multi-strut concept is adopted instead of the traditional concept.In order to study the static performance of the new drum-shaped honeycomb-type Ⅲ cable dome structure,a 120 m span finite element model was established to study the deformation and internal force of the structure under different loadings and distribution methods.Further parametric analysis was carried out to the structure,with the selected parameters including initial prestress level,rise-to-span ratio,strut height(thickness-to-span ratio)and lower chord node arrangement scheme.The effect of the various parameters on the static performance of the structure was assessed,including the overall stiffness and load bearing capacity of the structure.The results show that the drum-shaped honeycomb-type cable dome has a good structural performance,each cable rod is not prone to damage,and the overall structural stiffness is large.The reasonable range of values including the initial stress level and relevant geometric parameters is given,which provides a reference for the practical engineering design and application of cable dome.