Experiments on the Connection Collapse of Pultruded Fiber Reinforced Polymeric Shapes

2000 Fiscal Year Final Research Report Summary

• Project/Area Number: 10650560
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Building structures/materials
• Research Institution: Toyohashi University of Technology
• Principal Investigator: YAMADA Seishi Faculty of Engineering, Toyohashi University of Technology, Associate Professor, 工学部, 助教授 (50134028)
• Project Period (FY): 1998 – 2000
• Keywords: Fiber reinforced polymer / Connection / Failure mode

Research Abstract

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 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.