Experiments on the Connection Collapse of Pultruded Fiber Reinforced Polymeric Shapes

值得强调的是，最近加工和制造技术的进步使聚合物复合材料在建筑和土木工程结构中的应用具有吸引力。它们重量轻、耐腐蚀性强，特别适合大跨度网架结构。特别是拉挤复合材料，由于其质量生产率高、力学性能可控等优点，在这类建筑工程中具有很大的吸引力。聚合物复合材料工业的大部分努力都集中在工艺的优化以及最终产品的物理和结构性能的改善上。然而，任何由纤维增强聚合物(FRP)构件组成的结构体系的性能都受到连接FRP构件的节点效率的强烈影响。因此，节点效率的评估对于结构体系的设计是至关重要的。在本项目中，21个带孔的…试件对更多的ERS、74个双搭接试件和4个梁柱节点试件的承载能力和破坏形式进行了试验研究。(1)在净截面破坏试验中，有效净面积是将净面积乘以一个系数以说明其有效性降低而得到的面积。(2)在力学连接试验中，当边距和间距均大于紧固件直径的3倍时，破坏模式由剪切型向承重型转变。(3)在胶接情况下，胶接效率随胶接长度的增加呈非线性增加，其破坏模式为层间剪切破坏。(4)目前的声发射测试表明，缺陷压杆的类比可以应用于FRP倒塌荷载的估算。(5)通过梁柱节点试验，发现FRP构件垫层构件的破坏模式和最大载荷点后挠度行为的延性均受到影响。较少

It would be worth emphasizing that recent improvement in processing and manufacturing techniques have made polymeric composite materials attractive for applications in architecture and civil engineering structures. Their light weight, high corrosion resistance are particularly suitable for large-span space frame structures. Especially pultruded composites are very attractive for this kind of construction project due to their mass productivity and controllable mechanical properties. Most of the efforts in the polymeric composite industry have been focused on optimization of processing, and improvements of physical and structural properties of the end products. The behavior of any structural system composed of fiber reinforced polymeric (FRP) members, however, is strongly influenced by the efficiency of joints that join the FRP members. Therefore, the evaluation of the joint efficiency is crucial for the design of structural systems.In this project, 21 specimens with the holes for fasten … More ers, 74 double-lap jointing specimens, and 4 beam-column joint specimens were experimentally investigated for the load-carrying capacity and failure mcde. (1) In the test for the net section failure, the effective net area is the area obtained by multiplying the net area by a coefficient to account for its reduced effectiveness. (2) In the mechanical joint test, the failure mode is shown to change from shear-out type to bearing type when both the edge distance and the spacing are larger than three times the fastener diameter. (3) In the case of adhesive joint, the joint efficiency nonlinearly increases as the adhesive length increases, and its failure mode is an interlaminar shear failure one. (4) The present acoustic emission measurement suggested that the analogy of imperfect compressed columns would be able to be applied to the estimation of FRP collapse loads. (5) From the beam-column joint tests, it was found that the mat components of the FRP members affect the failure mode and the ductility of deflection behavior after the maximum load points. Less