Study On Mechanical Properties Of 25 - Meter - High Lamp Structure

High-pole lighting refers to the height of 20m and above street lamp. With the advantages of the lighting range, strong function, convenient operation, High-pole lighting is widely used in large lighting areas, such as city square, stadium, port, overpasses. The security performance requirements are relatively high in these public places. High-pole lighting be comprised by vertical slender shaft and the top of the lamp panel and belongs to the tall structures, Its characteristic is stem height, small cross-sectional area, stiffness and stability. High-pole lighting under load is mainly wind load and snow load, light, its own gravity and soil on the basis of forces,and its main wind load is control load. Large wind loads can cause damage and instability of the local structure of the pole, and even lead to instability caused by the collapse of the whole structure. So it is very necessary to study the mechanical properties of high pole lamp structure.The general design methods of high-pole lighting is usually use the production experience and the simple mechanical to calculate and check strength and stiffness. But the mechanical calculation formulas are studied according to the pole of the simplified, it has some error, and can not calculate the strength and stiffness of all the components of the high-pole lighting. with the development of computer technology and finite element theory, make use of the finite element method analysis of the structure of pole design research possible, But the results of finite element analysis is easy affected by the relationships of connections and assembly、element mesh、 boundary condition and other factors.therefor,the combination of the two methods can make the results more accutate.In this paper,25 meters high-pole lighting is the main object of study,and different methods have been used to study its strength stiffness、and the ability against overturning. Firstly, the loads of 25 meters high-pole lighting are analyzed. Secondly,Moore integral、The fourth strength theory and Beam bending theory are respectively used to calculate the poles of the beam deflection and strength as well as the natural frequency. finite element analysis method is used for modal analysis and static analysis of 25 meters high-pole lighting. Experimental testing method is used to test static stress、dynamic stress and acceleration of some point of the bottom of the pole.Finally, the above calculation results were compared and analyzed and high-pole lighting foundation’s overturning capacity is calculated. Comparative results show that the theoretical calculations and finite element analysis results are consistent. Through contrast experiment testing and finite element calculation results, we can get that the correctness and reliability of the finite element calculation and theoretical analysis.Finally aiming at the application of high-pole lighting in the practical engineering, high-pole lighting is optimized design based the comparative studies of theoretical calculations、 finite element analysis and experimental test.Adjusting the thickness of the pole, bolts and foundation size, finite element analysis and calculation of anti-overturning are applied for the optimized structure. After checking out the optimization of the structure can still meet the design requirements.