复杂山地环境下柔性光伏支架不同跨度时的结构性能与优化研究OA

To address the lack of systematic guidance for span optimization of flexible PV brackets in complex mountainous environments characterized by steep slopes and well-developed gullies,this paper establishes 3D finite element models of flexible PV brackets with dual-layer cable structure using the finite element analysis software MIDAS Gen,based on a mountain PV power project in Yunnan Province.Static performance(including deformation and stress)and dynamic characteristics(natural frequencies)of the flexible PV brackets with three different spans are comparatively analyzed.The comprehensive evaluation metric of"equivalent steel consumption"is introduced to compare the economic performance of the flexible PV brackets with three span options.The research results show that:1)When the span of the flexible PV brackets is 40 m or 60 m,both deformation and stress requirements of specifications of JGJ 257-2012 are met,whereas a 80 m span exhibits insufficient stiffness and cable stress exceeds the limit,necessitating prestress adjustments or larger cable cross-sections.2)Using equivalent steel consumption as the evaluation index,the 60 m span of flexible PV brackets demonstrates optimal economic efficiency,reducing steel costs by approximately 7.6%and 14.6%compared to the 40 m and 80 m spans,respectively.3)In PV power projects under similar complex mountainous conditions,when designing flexible PV brackets from the perspective of ensuring structural safety while balancing economic efficiency,it is recommended to prioritize a span value within the range of 55～65 m.The lower limit of this span range is determined by the inflection point where economic benefits rapidly improve,while the upper limit is governed by the critical point where structural performance begins to degrade significantly.4)Future research could further explore increasing span sampling quantities,considering the interaction between PV modules and PV brackets,cable node slip and friction details,as well as the time history analysis under long-term fatigue and extreme climate effects.These findings provide decision-making support for span selection of flexible PV brackets in complex mountainous environments and offer valuable guidance for scaling up their application in such settings.