© 2021 Soc. for the Advancement of Material and Process Engineering. All rights reserved.In spite of many existing works related to bonding techniques of polymer composites such as Single Lap Joints (SLJs) and Double Lap Joints (DLJs), investigation about the Single Strap Joints (SSJs) is quite limited. In this study, dynamic behavior of the SSJs with the glass fiber reinforced polymer adherends and straps was evaluated using a vibrating beam technique. The effects of the straps with different stacking sequences of ±450angles on the dynamic performance of the joints were investigated, and a special emphasis was given to their damping values. Two different lengths of unidirectional adherends with ten plies were used to get two different bonded (strap) lengths, 25 mm and 45 mm. On the other hand, four different types of straps were produced - each with ten plies; three types consisted of eight of plies of 00fiber angle and two plies of ±450angles at the top, at the bottom and in the middle of the straps, and the remaining one with ten plies of 00angle. The dynamic measurements were made at the fundamental natural frequency of the specimens with fixed-free boundary conditions. The results showed that the straps that consisted of the plies with the ±450angles contributed to the joint damping performance considerably, compared to those with the only 00angle. A numerical modal analysis was also conducted using a commercial package program. The predicted and experimental results were found in an agreement.