Analysis Of The Mechanical Structure Of Angle-steel Tower And Research On Its Safety Assessment Method

The communication angle-steel tower is a kind of high-rise structure for carrying the communication antenna, its purpose is to increase the communication antenna height, thus increase the aerial signal coverage.Based on the exact solution obtained by finite element analysis, this paper validates the feasibility of the layered space truss method to evaluate the safety performance of communication angle- steel towers. At the same time, considering the pulsation effect of wind load, the method of solving the wind-induced vibration of the communication angle-steel tower is studied.Because the angle-steel tower is a complex statically indeterminate structure, the mechanical properties of the communication angle-steel tower are studied by means of finite element software. By applying the corresponding wind loads, the mechanical performance parameters of the various types of components of angle-steel towers are obtained, and the accurate finite element model is determined by analyzing the results. At the same time, the beam element number of different types of members is determined by observing the change of the response of the beam element under the wind load, and the finite element model is perfected. Based on the finite element model, the response of the angle-steel tower under wind load is solved. Then, based on the applicable rule of the layered space truss method, the structure of communication angle-steel tower is simplified. The results are compared with the results of finite element analysis to verify the applicability and versatility of this method, and the calculation formula is revised. The results show that the proposed method is effective and reliable. Finally, the wind load time history curve is simulated by harmonic superposition method, and the wind-induced vibration response of 45m communication angle-steel tower is solved by using time-history analysis method. The results obtained are compared with the results of finite element analysis to verify the rationality of the time history analysis method to solve the wind-induced vibration response of the communication angle steel tower.The results show that the truss composite model is an accurate model for the finite element analysis of angle steel towers, that is, the main material, skew material and diaphragm of angle-steel tower are the main bearing shear and bending moments. To withstand axial force. At the same time, the wind load response of the communication angle steel-tower after simplified structure is solved by the layered space truss method. The results obtained from each tower section are consistent with the finite element results. The errors are within the allowable range.Applicability and universality of wind load response of angle steel. The basic structural parameters (basic dimensions, material properties, etc.) of the communication angle-steel towers and the structural response under the wind load are established through the layered space truss method, and the safety performance of the communication angle steel towers is evaluated rapidly. Finally, by comparing the time history analysis results of 45m communication angle-steel tower with the finite element analysis results, it is shown that the time history analysis method can well solve the wind-induced vibration response of the communication tower.Compared with the accuracy of the calculation method given in the relevant specification, And can reflect the wind-induced vibration response of the communication angle-steel tower at any time.