摘要
FRP型材拼装箱梁是由FRP拉挤型材空心板通过三向连接件、骨状挂钩等销接构件拼装而成的箱梁,具有重量轻、耐腐蚀性能好、施工速度快等突出优点,适用于小跨径公路桥及人行桥。本文采用层合材料壳体单元建立了FRP型材拼装箱梁的有限元模型,对单调静力荷载下箱梁的变形和应力等受力性能进行了研究,并与试验结果进行了对比。在此基础上,开展了11片箱梁的有限元参数分析,重点考察了FRP纤维铺层、箱梁顶、底板宽度以及型材板高度等因素对箱梁跨中挠度和应力的影响。研究表明,FRP型材拼装箱的截面尺寸主要由刚度控制,箱梁具有较大的强度储备;箱梁的顶、底板宽度、型材板壁厚和纵隔板、壁板高度等因素对箱梁的刚度或应力的影响较大,而纤维铺层对箱梁结构刚度的影响较小。
The FRP profile assembled box beam is a box beam composed of pultruded cellular profiles the interlocking connected with other profiles through square tubes and toggle-bars. The FRP profile assembled box beam is a light, corrosion-proof structural member and can be quickly fabricated and applied in short span highway bridges or pedestrian bridges. In this paper, a linear constitutive shell FE model was created and validated by existing laboratory testing to discuss the monotonic flexural behavior of the box beams. Moreover, parametric analysis was conducted on 11 FE models to investigate the influence of lamina stacking properties, FRP profile width, FRP profile height and other parameters on the midspan deflection and stress of assembled box beams. The study revealed that the design of box beam was controlled by stiffness, the box beam had a sufficient strength safety margin; the stress or midspan deflection of the box beam was greatly influenced by FRP profile width, web height and wall thickness of FRP profile, while the box beam stiffness was less sensitive to the influence of lamina stacking properties.
出处
《玻璃钢／复合材料》
CAS
CSCD
2009年第1期68-72,22,共6页
Fiber Reinforced Plastics/Composites
基金
交通部西部交通建设科技项目(200631882244)
