张弦梁挑蓬结构的试验研究

Test study on beam string roof structure

将张弦梁原理运用到悬臂结构,进而构造出一种环状悬臂张弦梁挑蓬结构.继理论分析之后,为了验证这种结构的受力性能,通过静力试验重点分析模型在全跨和半跨荷载下的承载规律,之后从模态试验分析中,进一步了解结构的刚度和动力特性.试验结果表明:(1)结构受力合理,抵抗非对称荷载能力较强,有很好的整体稳定性;(2)与柔性悬索结构相比,结构第1阶自振频率较高,有较好的刚度;(3)设计时给定了拉索的位置,该种结构的施工相对于索穹顶、环状索-桁张力挑蓬要容易.

According to the concept of beam string structure, a kind of circular cantilever beam string roof structure (CBSS) was presented. After the study on the structure in theory, the static and modal experiments were carried out. The analysis of the behavior of CBSS, on the full and half-span load was taken out. Through the modal experiment, the stiffness and dynamic characteristics were verified. Some conclusions are shown as follows: (1) The structure with good mechanical behavior and strong ability to resist asymmetry load, has excellent overall stability (2) The stiffness and the first natural frequency of vibration of CBSS are higher than that of the flexible suspension cable structure. (3) The location of the cables is given, so the construction of the structure is easier than cable dome and the circular cable-truss structure.