不同截面条件下光伏支架次梁结构受力性能分析及优化设计

Stress Performance Analysis and Optimization Design of Secondary Beam Structure of Photovoltaic Racking under Different Cross-Section Conditions

对不同截面条件下光伏支架次梁结构受力性能进行分析。根据实际的光伏支架次梁结构,建立相应的力学模型。选择合适的截面形状,并确定其尺寸参数。据实际应用场景,确定光伏支架次梁结构所承受的外部载荷。采用ED12梁单元建模,在模型中约束梁端平动自由度,优化载荷条件。计算风荷载标准值,雪荷载和组合荷载。运用有限元模型进行荷载分析,将光伏组件安装在次梁上,计算次梁的受力面荷载,判断其结构受力性能情况。研究表明:当截面高度为40mm时,试件的最大应力均不能满足规范设计要求,当高度不断增加达到55mm时,次梁结构的最大应力小于110MPa,峰值位移影响较小;当截面厚度为1.5mm时,梁的最大挠度大幅度下降。当厚度为3.0mm时,梁的最大挠度值变化程度不高,结构的刚度增长减慢。得到结论:截面厚度和截面高度对结构的最大应力和最大挠度值影响较大。

The force performance of secondary beam structure of photovoltaic racking is analyzed under different cross-section conditions.According to the actual secondary beam structure of photovoltaic bracket,the corresponding mechanical model is established.Select the appropriate cross-section shape and determine its dimensional parameters.According to the actual application scenario,determine the external loads borne by the secondary beam structure of PV racking.Use ED12 beam unit modeling,constrain the beam end translational degrees of freedom in the model,optimize the load conditions.Calculate the standard value of wind load,snow load and combined load.Using finite element modeling for load analysis,the PV modules are installed on the secondary beams,and the loads on the stressed surfaces of the secondary beams are calculated to determine their structural stress performance.The study shows that:when the cross-section height is 40 mm,the maximum stresses of the specimens are not able to meet the code design requirements,and when the height keeps increasing to reach 55 mm,the maximum stresses of the secondary beam structure are less than 110 MPa,and the influence of the peak displacements is smaller;when the thickness of the cross-section is 1.5 mm,the maximum deflection of the beam decreases substantially.When the thickness of the section is 3.0 mm,the maximum deflection value of the beam does not change to a high degree,and the stiffness growth of the structure slows down.It is concluded that the section thickness and section height have a large influence on the maximum stress and maximum deflection values of the structure.