【摘要】 根据张弦梁结构的思想提出由组合网架和索通过支杆相连而形成的预应力结构即弦支组合网架结构。建立一弦支组合网架结构的计算模型,利用ANSYS有限元软件分析结构在不同预应力作用下的静力和自振特性。得知预应力能够较为明显的改善结构位移和杆件内力,即索内初始预应力越大,结构位移和杆件内力越小;改变预应力对结构的自振特性几乎没有影响。更多还原

【Abstract】 According to the thought of beam string structure,prestressing structure was presented that it was joined by combined grid and cable supported by pole.It was combined grid string branch structure.A calculation model of string branch grid was founded.Static and dynamic characteristics of the structure acted by different prestress value were analyzed.Through the analysis,the structure displacement and internal forces of rod improved obviously depending on prestress value.The larger prestress value was,the lower structure displacement and internal forces of rod.While prestress value is changing,natural vibration characteristics of the structure remain steady.更多还原