Stress Performance Analysis and Optimization Design of Secondary Beam Structure of Photovoltaic Racking under Different Cross-Section Conditions
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 ED 12 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.
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