Vibration Behavior of Large Span Structures having Fiber Reinforced Polymer Shapes

本研究旨在将拉挤纤维增强复合材料(FRP)型材应用于各种大跨度屋盖结构，为此，本文对刚接单层柱面网壳结构进行了研究。首先，对FRP型材的刚度分量进行了试验识别，并用有限梁单元进行了线性应力分析；对于钢结构，位移并不随材料浓度的增加而成比例增加。其次，进行了无阻尼自由振动分析，结果表明，结构的固有频率和振型不随结构的刚度而变化，而是随结构整体尺寸的变化而变化。第三，进行了地震反应分析，结果表明，纵向杆件的应力水平很低，而斜向杆件的动力地震反应振动所承受的应力相对较大。结果表明，FRP大跨度结构的振型、应力分布、弯矩结果、动应力行为与钢构件非常相似。

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.