Vibration Behavior of Large Span Structures having Fiber Reinforced Polymer Shapes

本文以刚性连接单层柱面网壳结构为研究对象，旨在将拉挤成型的纤维增强复合材料（FRP）型材应用于各种大跨度屋盖结构中。首先，FRP形状的刚度分量的实验识别和线性应力分析，使用有限梁单元已进行;位移不增加成比例的材料刚度的钢结构。其次，进行了无阻尼自由振动分析，结果表明，本征频率和振型不随刚度而变化，而是随结构整体尺寸而变化。第三，对结构进行了地震反应分析，结果表明，在地震反应振动中，纵向构件的应力水平很低，而斜向构件的应力水平相对较大。结果表明，FRP大跨度结构的振型、应力分布、弯矩合力、动应力特性与钢结构非常相似。

The present study has the potential purpose of the application of pultruded fiber reinforced polymer (FRP) shapes to various kinds of large span roof structures, therefore, the rigid jointed single layer latticed cylindrical roof structures have been treated here. First of all, the experimental identification of the stiffness components of the FRP shapes and the linear stress analysis using finite beam elements have been carried out ; the displacement are shown not to increase in proportion to the material consistencies in respect to the steel structures. Second, the undamped free vibration analysis was performed, and it has been shown that the eigen frequencies and modes are varied not with the stiffness but the whole structural dimension. Third, the seismic response analysis was carried out, and it has been suggested that the stress level of longitudinal direction members is very low, however, the diagonal direction members suffer from the relatively large stress through dynamic earthquake response vibration. Finally, it would be shown that the vibration mode, stress distribution, moment resultants, dynamic stress behavior of the FRP large span structures are very similar to those which consist of steel members.