Prestressed Cable Truss Dynamic Analysis Of Point-glass Curtain Wall

Prestressing cable truss point-supporting glass curtain wall is made up by cable , steel pole , glass and connection materials, mainly as enclosing and protecting structure; For its unique artistic result of building, near decades more and more buildings adopt this kind of curtain wall. Study on this kind of structure system isn't deep enough at present, especially the dynamic research in wind load, earthquake action vibration load is less perfect, and lots of and instances that the curtain wall structure destroy take place because of this kind of situation, so the study on this facet can't be ignored. This text has done the dynamic analysis of the whole curtain wall structure system on the basis of the forefathers' studys.At first this text has introduced the structure form and characteristic on this kind of curtain wall, the character and mechanics performance of glass and cable making up of the supporting system; The cable is having initial prestressing force and then having rigidity ; While deriving the finite element equation, get the cable's strain formula considering the big distortion, get its geometry rigidity matrix and elastic rigidity matrix. Solved the non-linear equation group by Newton-laphson method.The key introduction to this text utilizes the finite element software ANSYS to analyse dynamic performance of the glass curtain wall as a flexible structure. From the finite element equation that is derived according to the minimum potential energy principle as the foundation , have calculated the structure's shaking frequency and type, have analysed the influence of different parameters (such as different prestressing force , arrow high ) to the shake, which have great help to the design of the structure and next dynamic analysis.To the structure's responding analyse on action of earthquake, this text has adopted the at first; The simple introduction of the response spectrum concept, has set up the dynamical equation of the earthquake action, and has recommended the solving method of superposing shaking type ; Utilizing the modal analyse result, calculates the earthquake respond according to our country anti-seismic norm with ANSYS response spectrum method; Secondly introduces time interval method also namely Newmark calculous; For the El Centra north and south earthquake record has analysed the earthquake respond in time field utilizing APDL language of ANSYS, detailed amplitude of stress and displacement appearing in every component, contrasted out lots of conclusions with the quiet result of calculation of strength , response spectrum method result of the response, given some advice on the enlarging coefficient.At last this text has analysed the structure's respond to the wind loads , according to calculating formula on the country loads norm, has carried on the equivalent, has drawn the greatest displacement and stress, has discussed the influence of different parameters. And then as a shaking load at random, it carries on power spectrum and with ANSYS, has ed wind shaking coefficient under different parameters; Through contrasting with the calculating results of time interval analysis and quiet strength calculation , has drawn a lot of conclusions .