【摘要】 双向张弦梁结构是一种新型的空间结构形式,主要应用于大空间平屋顶和双曲屋顶中。本文采用连续化的数学模型;首先根据双向张弦梁结构的平衡荷载与索曲面及索拉力之间的关系,给出了下弦索网所在曲面的偏微分方程,并用变分法进行预应力分析;其次对双向张弦梁结构的静力与动力特性采用能量变分原理进行分析。算例分析表明,方法简便,概念清楚,可供结构设计参考。更多还原

【Abstract】 Bi-directional string structures,widely used in large spatial plat roof and bi-curved roof,are new types of spatial structures. In this paper,the mathematical model of an equivalent continum is proposed. Firstly,the differential equation of the curved surface of the down string-net of bi-directional string structure is deduced based on the relationships of balanced load,the form of string-net and the tensions of the trings. The prestress of the trings is calcutated by the variational method. Then the static and dynamical characteristics of bi-directional string structure are analyzed by the energy variational principle. Numerical example is given. The proposed method is clear in conception and convenient in calculation for the bi-directional string structure,which can be used in design.更多还原