Aeroelastic Wind-Tunnel Test Of One-Way Type Tensioned Membrane Structure

Tensioned membrane structure is a new type of structure system, which stiffness is given by the pre-tensioned stress within membrane and the geometry of pre-formed. The structure compared with traditional ones has two significant features, that is the "lightweight" and "flexibility". The above characteristics also determine membrance structure has a good seismic performance, but sensitive to wind load. Under the effect of wind load, one interaction between membrane structure and wind may be occured, which is called "fluid-structure interaction"(FSI). In some circumstances, this interaction will lead to damage in the structure. Therefore, wind-induced vibration characteristics of research play an important role in this kind of structure.Membrance structure in various forms, is gengeally a complex three- dimensional system, many factors affect the properties of its fluid-structure interaction. Due to its simplity and universality, the present paper have processed numbers of mechancial investigation on one-way type tensioned membrane structure. Besides, it could be easily simplified into two-dimensional structure systerm in some conditions, which simplifies the simulation and analytical method and also very useful in comparing the experimental and analytical results. Based on this principle, multiparameter comparison (including the structural parameters and the aerodynamic characteristics of flow parameters) wind tunnel tests were conducted to study wind-induced response characteristics for aeroelastic models of one-way type tension membrane structures. Main tasks are as follows:1. A comprehensive scheme of wind tunnel test on aeroelastic modelshas been studied and made. We studied the FSI performance between the wind and membrance structure in aspects of different structural characteristic and flow characteristic parameters.2. Theπtheorem is adopted to induce the similarity criterion about aeroelastic model tests of one-way type tensioned membrane structure; Designing and making one-way type of tensioned membrane structure aeroelastic models, including both the opened and closed ones. In order to get material properties of water-resistant silk and latex film, both of different test methods were adopted.3. Wind tunnel test of aeroelastic model was performed, laser displacement meters was used to measure the time-history displacement of some points and also applied certain methods for data processing and analysis.4. Based on the data from the test, comprehensive use of Butterworth band-pass filter (BBF) , Hilbert-Huang transform (HHT) and the modified random decrement technique (MRDT) to identify both the lower frequency and damping ratio of the aeroelastic model.