The Wind-Excited Vibration Of The Cable-Stayed Spatial Latticed Structures

The cable-stayed spatial latticed structures were assembly structure, which combined towers, spatial latticed and cables. A lot of research on cable-stayed space spatial latticed structures had been carried out, but only a few studies involved the wind-excited vibration, and the influence of wind-excited vibration of cables was never considered. So some research on the performance of cable-stayed space was carried out in this thesis.Generation of wind speed records was the premise for the analysis of the wind-excited vibration in time history. According to autoregressive-type simulation methods, a program considering spatial correlativity was completed. Some numerical examples were illustrated to show the efficiency of the program.Firstly, the study on the static and dynamic behaviors of single cable was carried out in the paper. The cable was analyzed by multi-element in FEM, its static results were compared with catenary theory, its natural frequency was compared with the chord vibration theory. The examples were showed that this method was feasible. Based on the above research, the wind-excited vibration of the single cable in different inclination and the value of pre-stressed force was analyzed, and the wind coupling effect of the vibration was studied. As a result, the wind-excited vibration of the cable was relative small, the influence of the wind coupling effect was not evident either.For carrying on thorough research of the dynamic behavior of the structure, three model were concerned: a spatial latticed structure, a cable-stayed spatial latticed structure(the free vibration and wind-excited vibration of the cables were ignored), a cable-stayed spatial latticed structure(the free vibration and wind-excited vibration of the cables were considered).From the analysis of the static behavior of three models, the results revealed that the mechanics characteristic of the cable-stayed spatial latticed structure were more reasonable than the spatial latticed structure, and the static behavior of two kind of cable-stayed spatial latticed structure models were almost the same.From the analysis of the free vibration of the three models, the results revealed that the basic frequency of the cable-stayed spatial latticed structure was higher than the spatial latticed structure, and the free vibration of cables had only tiny influence on the ex-20 stages frequency of the structure.From the analysis of wind-excited vibration of the three models, the results revealed that the wind-excited vibration of the cable-stayed spatial latticed structure was smaller than the spatial latticed structure , and the wind-excited vibration of cables had only little influence on the structure. The wind just had slight influence on the cables, only when the force of cables was small.