双平行索桁架支撑的光伏结构：风致振动及影响因素评估

Abstract Cable-supported photovoltaic structures are widely used, while wind-induced vibrations (WIV) remain a primary concern. This study investigated the WIV of a 40 m-span two parallel cable trusses-supported photovoltaic structure and its influencing factors through aeroelastic model tests. The structural responses, including displacement and tension, were measured in flows with varying turbulence intensities. The effects of turbulence intensity, pretensions of cables, and tilt angle of modules were evaluated. The results showed two different responses, buffeting and self-induced vibration (SEV). In turbulent flow, the structural response was manifested as buffeting and the response behaved randomly in the time domain and followed a Gaussian distribution. SEV was observed in uniform flow, manifesting periodic amplitude-limiting vibrations and vibration frequency convergence, and causing hardening non-Gaussian effects (with kurtosis of 1.5 roughly) in both displacement and tension. Parameterized analysis proved that the major factors influencing WIV were turbulence intensity and the tilt angle of the modules rather than the pretension of cables. The buffeting amplitude was positively correlated with turbulence intensity: the vertical fluctuating response at a turbulence intensity of 0.2 was approximately 1.6 times that at 0.1. Higher tilt angles of the modules lowered the critical wind speed: within the range of tilt angles of 0° to 30°, the critical wind speed decreased by 37.5 %, 3 %, and 22.8 % for every 10° increment, respectively. Therefore, increasing the turbulence intensity of the incoming flow and decreasing the tilt angles of the modules are considered effective measures to suppress SEV and reduce WIV, respectively.