Single tube tower is widely used in communication and transmission lines and other fields abroad. Single tube tower has the advantages of simple structure, convenient construction, simple and beautiful appearance and small floor area, and has a good development prospect. In order to give full play to the performance of the single pipe tower and make its design and construction technology more mature, this paper analyzes and studies the static nonlinear and wind-induced vibration control of the single pipe tower.
Wind load is an important horizontal load for zui of single pipe tower. Under the action of design wind load, the lateral displacement of the single pipe tower is large, which usually controls the design of the single pipe tower. However, the current method for calculating the lateral displacement of the single pipe tower is not clear. In this paper, taking the single pipe communication tower as an example, linear elasticity and second-order elasticity analysis are carried out for the calculation examples of single pipe communication tower with different height, diameter thickness ratio and other parameters; In the second order elastic analysis, the integral initial bending defect of the single tube tower is introduced. The results show that in order to reduce the lateral displacement of the single tube tower, the wind vibration control of the single tube tower structure is required; At the same time, the second order elastic analysis method is recommended for the design and calculation of single pipe tower structures above 50m.
Wind load is an important horizontal load for zui of single pipe tower. Under the action of design wind load, the lateral displacement of the single pipe tower is large, which usually controls the design of the single pipe tower. However, the current method for calculating the lateral displacement of the single pipe tower is not clear. In this paper, taking the single pipe communication tower as an example, linear elasticity and second-order elasticity analysis are carried out for the calculation examples of single pipe communication tower with different height, diameter thickness ratio and other parameters; In the second order elastic analysis, the integral initial bending defect of the single tube tower is introduced. The results show that in order to reduce the lateral displacement of the single tube tower, the wind vibration control of the single tube tower structure is required; At the same time, the second order elastic analysis method is recommended for the design and calculation of single pipe tower structures above 50m.
In order to have a better understanding of the nonlinearity of the single tube tower and the influence of the defects on the structure, this paper, on the basis of introducing the initial geometric defects and mechanical defects, analyzes the whole process of the calculation example of the 50m single tube communication tower, and obtains the load displacement curve of the whole process of the structure. The results show that the defects have little effect on the ultimate bearing capacity of the single tube tower; However, the stiffness of the structure is greatly affected, mainly by geometric defects; Under the design load, it is suggested that for the single tube tower structure above 50m, in addition to the second-order elastic analysis method, the geometric defects of the structure should also be introduced. Under the action of wind load, it is necessary to control the wind vibration of single tube tower structure. However, there is no ideal shock absorber for single tube tower structure at home and abroad. Considering the requirements of small internal space and low production cost, this paper attempts to set steel ball damper on the single tube tower to control the wind vibration of the structure. The author simulates the time history curve of pulsating wind load of a practical single pipe communication tower based on the harmonic superposition method, and then expounds the vibration reduction principle of the steel ball damper, and then analyzes the time history of the single pipe communication tower structure before and after installing the steel ball damper. Through the comparison of the results of the two calculation models, it is concluded that the effect of the steel ball damper on the wind vibration control of the single pipe tower structure is better. On this basis, this paper continues to discuss the feasibility of applying steel ball damper to the construction of single tube tower. The research shows that the steel ball damper is simple in structure, low in space requirements and low in manufacturing cost, and can well control the wind vibration of the single tube tower structure. Therefore, the steel ball damper is a kind of damping device more suitable for the single tube tower structure.
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