Abstract：There is significant aerodynamic interference between twin rectangular cylinders. A series of sectional model dynamic tests and pressure measurements were carried out to investigate the vortex-induced vibration (VIV) performance of twin rectangular cylinders with an aspect ratio of 5:1. Four cases of restraint conditions were considered, that is (1) both cylinders are restrained (Case 1); (2) the upstream cylinder (UC) is restrained while the downstream cylinder (UC) is free to vibrate (Case 2); (3) UC is free to vibrate while DC is restrained (Case 3) and (4) both cylinders are free to vibrate (Case 4). The analyses were performed based on VIV responses as well as mean and fluctuating pressure coefficient distributions. Additionally, the time and frequency domain statistical parameters like correlation and contribution coefficients between distributed and general vortex excited forces (VEFs) and VEF coefficients amplitudes at predominant frequencies were calculated to investigate the VIV mechanism of the cylinders with different restraint conditions. The results indicate that the VIV response of UC decreases for the case of Case 4 as compared with Case 2, the response of the DC increases significantly for Case 4 compared with Case 3. The effect of restraint conditions is more pronounced for DC than UC. The influence of the distributed VEFs on the windward and leeward surfaces of the cylinders to the general VEFs is comparatively minor, and the contribution can be neglected. However, the contribution of the local VEFs in the region of the trailing face of UC and the leading face of DC is significant from the view of the time and frequency-domain statistical characteristics. Generally, the distributions of these statistical parameters are similar for different restraint conditions, while the discrepancy in quantity could not be neglected.
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