Tests of Bolted Joints in Fiber-Reinforced Polymer Composite I-Beams
Date Issued
2012
Date
2012
Author(s)
Sun, Pi-Fan
Abstract
This study develops the technology for a temporary Fiber Reinforced Polymer (FRP) composite bridge for the purposes of evacuation of victims and the delivery of food supplies in emergency disaster area. Six FRP beams manufactured in Taiwan were subjected to a four-point bending test. The objective was to study the bolted connection behavior and ultimate capacity of the FRP beam. Except for Specimen 2, two continuous FRP beams failed when the actuator load reached near 180 kN. Three FRP beams with bolted connections in the mid-span failed near the same load as those continuous FRP beams.
The behavior of composite I-beams with mechanical joints was examined using bolted connection and full-scale specimens. The effect of the number、configuration and distance(longitudinal and transverse) of bolts on the load capacity and failure mode of the double-lap bolted joints were investigated. The results showed that the increase on the load capacity was however observed with increasing distance of bolts. And the bolted connection developed full strengths when longitudinal and transverse spacing are more than 4 bolt diameters. Strength prediction (LRFD 2005) was carried out and the results showed a good correlation with the experiment when the longitudinal and transverse spacing were 4 bolt diameters. The flexural behavior behavior of full-scale composite I-beams with bolted joints at middle span connected was further examined. Specimens 1 to 3 are continuous beams, and Specimens 4 to 6 are bolted connection beams. Specimens 1 and 4 use all GFRP in the flanges. The failure mode of Specimen 1 is compression at middle span, and Specimen 4 is torsion at middle span. Specimens 2 and 5 use 12% CFRP in the flanges. The failure mode of Specimens 2 and 5 are compression at loading point. Specimens 3 and 6 use 24% CFRP in the flanges. The failure mode of Specimen 3 is compression at middle span, and Specimen 6 is compression at loading point. According to the test result of SP1 to SP6, It’s found that the failure mode of all specimens is almost the compression failure, and the maximum compression strain is located between 0.3 to 0.4%. The stiffness of beam, which use all GFRP in the flanges, is 20 GPa. The stiffness of beam, which use 12% CFRP in the flanges, is 22 GPa. The stiffness of beam, which use 24% CFRP in the flanges, is 28 GPa. It’s seems that when the higher carbon volume content is utilized, the elastic modulus will increase. The analysis results from ABAQUS show that the stiffness of model 1 and model 2 are similar to the stiffness of test results. The local buckling load of model 1 from ABAQUS is 4~8% error between analysis and prediction. The local buckling load of model 2 is 25~30% error between analysis and prediction.
Subjects
Fiber reinforced polymer (FRP) composite bridge
Four-point bending test
Bolted connection
Multi-bolt joints
SDGs
Type
thesis
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