Wind Vibration Response Analysis Of Typical Cable And Membrane Canopy

For its beautiful architectural shape and good bearing system, Tensioned cable and membrane structure is getting more and more favor of architect and probably have a broadening application. Dynamic response analysis of tensioned cable and membrane structure is one of difficulties of structure design because of its tensioned-only, large deformation and small strain property. This paper takes an systemic study on typical tensioned cable and membrane structure based on dynamic theory and draw some useful results.The theory of wind engineering and wind-induced dynamic response is studied and summarized systematically. The property of fluctuant and even wind are also expatiated.The relationship between frequency and prestress, ratio of rise to span of tensioned cable and membrane structure are also studied. The frequency of tensioned cable and membrane structure is very dense and nonlinear property is obvious. The frequency of structure becomes higher with the increase of membrane prestress , ratio of rise to span and initial strain of cables.The time domain method for wind-induced dynamic response analysis is investigated. A autoregressive-type simulation method is adopted to simulate the fluctuant wind load according to the Davenport Wind Spectrum and it meet the needs of velocity and pressure of simulated wind load. This simulation also takes the change of height into account. The dynamic response of typical canopy is studied systematically and draws some useful conclusions. The vibration of structure under the random fluctuant wind load is forced vibration. The vertical response is also remarkable under the horizontal random wind load and can not be ignored. Compared with the velocity of wind, the velocity of structure is smaller and the modification of wind can avoid. Compared with wind-induced load, the lower frequency of structural displacement is even more than higher frequency.Aerodynamic instability of typical is also studied and the formula that can be applied to large span structure roof is deduced.