Study On Dynamic Characteristics Of High-rise Solar Power Tower

Tower solar-thermal electricity has now developed into an important form of solar power generation.In recent years,some large-scale high-rise solar power towers have been built in China.The high-rise solar power tower is a new type of energy structure,and there are few researches on the high-rise solar power tower.At present,domestic research on shaking table test of such structure has not been conducted.Therefore,it is necessary to explore the design of the similar model on shaking table test and study the dynamic characteristics of the high-rise solar power tower.Taking the Morocco NOORIII solar power tower as antetype,a 1:18 similar model of shaking table test is designed and manufactured.The design method for the reinforcement of concrete cylinder,the simplified method for the elevator shaft wall and the complex steel structure are discussed.In order to solve the problem that it is difficult to apply artificial quality to this model,mixing high content of lead powder in particulate concrete as a simulation material for the original structural concrete and the wood properties are tested.These investigations can provide reference for future shaking table tests of such structures.Analysing the dynamic characteristics of high-rise solar power tower by the seismic simulation shaking table test.It is concluded that the natural period of this structure is far from the predominant period and the characteristic period of the site.The low-order mode of vibration mode shows horizontal vibration,and the torsional vibration mode and vertical vibration mode appear in high-order vibration modes,which indicates that the plane and vertical arrangement of the structure are reasonable.However,the whiplash effect of the top steel structure in horizontal high-order vibration modes is obvious due to abrupt change in stiffness and the presence ofequipment with great quality.In this shaking table test,white noise scanning is carried out after each seismic wave excitation input,discovering that the frequency of the structure is reduced with the increase of the excitation acceleration amplitude,while the damping ratio increases with the deterioration of the structural rigidity,especially accelerated changes under high-intensity excitation.At the end of all operating conditions,the frequency of the model structure decreases significantly,which indicats that the structural damage is relatively serious.The similarity model is numerically simulated by ABAQUS finite element software and compared with the experimental results,the rationality of the finite element numerical model and the experimental model is verified interactively.Analyzing the influence degree of the large opening on the tower body to the dynamic characteristics of the model and it is considered that the larger hole in the original structure can not be ignored in the similar model design on shaking table test.Establishing the finite element model of similar model with no top weight mass.The analysis show that the natural vibration frequency of the model changes greatly when there is no platform weight,which indicates that the large-scale equipment inside the top steel structure obviously affects the dynamic characteristics of the solar power tower structure.It should be emphasized in the design of the structure.