ANALYSIS ON WIND-INDUCED VIBRATION RESPONSE OF CABLE-STAYED LATTICE STRUCTURE

摘要

Based on summary of calculation theory of structural wind engineering and fluctuating wind simulation, the conversion technology from wind speed time interval to wind pressure time interval is studied in this paper. Considering the 3d coherence of the space point, the program of simulating fluctuating wind is compiled based on AR algorithm to select AR(p) and different target wind velocity spectrum freely. Furthermore, the fluctuating wind speed time series under the intended target spectrum can be gained by modifying a small quantity of parameters using the above mentioned programme, and the wind speed time series of many space points are simulated. The analysis of wind-induced response of the awning in Guangzhou University City main stadium is performed by wind loading program, which is compiled by APDL. The analysis results indicate that displacements and the cable forces fluctuate around the average during the process of random wind vibration, and the volatilization doesn't generate. The conclusions are that the instability of cable-mast structure can not happen under wind load, the displacements of cables are small, which guarantee against colliding with the adjacent cables under fluctuating wind, and stress amplitude is very low under wind load, that will not lead to fatigue damage. Wind load is one of the important factor which leads to structural damage. The situation that airport and stadium roof was blown bad had occurred many times in China. Cable-stayed lattice structure is characterized by small damping, light weight and sensitive to wind effect. The canopy of Guangzhou University Town Center Stadium is different from ordinary cable-stayed lattice structure. It has many masts, many cables, and it is the "double-hinged support" system. The safety of the structure under wind load is worth to study. In this paper, with the background of cable-stayed lattice steel roof of Guangzhou University Town Center Stadium, program is composited to calculate three-dimensional timerelated wind speed. Wind load is imposed on the roof calculation model by the APDL language of ANSYS program. The wind-induced vibration response of the structure is studied to ensure the structure safety.