Simulation Analysis On Wind-induced Vibration Of Long-span Grid Roof Structures

Recently, along with the development of high-strength material, structural design and technique of computer simulation, a number of long-span space structures with beautiful shapes were widely applied into public constructions. for example, aerodrome,gymnasium,exhibition building, commercial square and theater. Long-span grid roof structure is the most representative structural style, which reflects the present architecture tendency.Comparing to high-rise building , many projects and the character of grid roof structure indicate that wind-induced vibration response of long-span grid roof is also serious. As we know, single member bar in grid roof structure has low strength, while stiffness of local grid is weak. So when wind flows around roof, the local grid will has lager dynamic response, such as displacement and speed. What's more, the whole grid roof will take collapsing because of fluid-solid interaction.Based on rigid model wind tunnel test and numerical simulation, ANSYS and MATLAB are used to analyze wind-induced vibration response of the gymnasium's long-span grid roof.According to characteristic of space structure, environment, climate etc. the wind velocity of grid roof's node are simulated by an application program (AMENG), which carry in MATLAB. Then changing wind velocity and result of wind tunnel test into wind load. The wind-induced vibration response analysis is consisted of modal analysis, time-history analysis, power spectrum analysis, which is carried out in ANSYS. After analyzing, we can get a series vibration response results, such as the displacement response in different wind angle, displacement spectrum response, wind load factor. From the vibration response results, it is convenient to realize the regularity, dynamic energy contribute, response distribute, worst wind angle etc. compared with power spectrum analysis, the result and method of time-history analysis of long-span grid roof structure is exact.