摘要
轮辐式斜交型索结构体系的弦索采用斜向布置形式,能有效改善结构的整体抗扭性能,并有利于提升施工稳定性和使用安全性,同时也增加索结构体系的美感,丰富结构形式。通过几何形态分析发现轮辐式斜交型索结构的关键形态参数包括索结构桁架单元数量、斜交角度、内外环半径、起拱高度和下垂深度,并基于此建立参数化建模方法。根据节点平衡方程,推导轮辐式斜交型索结构在预应力态下的索杆内力快速估算公式,并探究斜交角度、内外环厚度和内外环几何中心高差对预应力分布的影响,结果表明:斜交角度对结构受力效率的影响较大;内外环厚度对拉索索力的影响很小,而对内环撑杆轴压力的影响较大;内外环几何中心高差对索杆内力的影响较大。该文的研究有助于促进轮辐式斜交型索结构的进一步应用。
By adopting the crossed arrangement of chord cables,the wheel-spoke crossed cable structural system can effectively improve its overall torsional resistance,enhance the stability of construction and the safety in use,and at the same time increase the aesthetics of the cable structural system and enrich the structural form.Based on the geometric morphology analysis,it is found that the key morphological parameters of wheel-spoke crossed cable structure include the number of cable truss units,crossed angle,the radius of inner and outer rings,springing height and sagging depth,and furthermore the parametric modeling method was established.According to the nodal equilibrium equations,the formula for fast estimation on the internal forces of cables and struts in the wheel-spoke crossed cable structure under prestressed state was derived.The effects of the crossed angle,the thickness of inner or outer rings and the height dfference between the geometric centers of the inner and outer rings on the distribution of prestress were investigated.The results showed that the crossed angle has a great effect on the structural mechanical efficiency,the thickness of inner or outer rings has a small effect on the cable force,but it has a great effect on the axial pressure of inner ring struts.Moreover,the height difference between the geometric centers of the inner and outer rings has a great effect on the internal forces of cables and struts.This study shall be beneficial to promoting the further application of wheel-spoke crossed cable structures.
作者
杨佳奇
武岳
周光毅
辛光耀
李东方
Yang Jiaqi;Wu Yue;Zhou Guangyi;Xin Cuangyao;Li Dongfang(Key Lab of Structures Dynamic Behawior and Control of the Ministry of Education,Harbin Institute of Technology,Harbin 150090,China;Key Lab of Smart Prevention and Mitigation of Ciril Engineering Disasters of the Ministry of Indusry and Information Technology,Harbin Institue of Technology,Harbin 150090,China;China Construction Eighth Engineering Division Co.,Ltd,Shanghai 200122,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2024年第12期30-42,共13页
China Civil Engineering Journal
基金
国家自然科学基金(52078163)。
关键词
轮辐式索结构
结构构型
几何形态分析
参数化建模
预应力态分析
受力特性
wheel-spoke cable structures
structural configuration
geometric morphology analysis
parametric modeling
prestressed state analysis
mechanical property
