Anti-Seismic Performance Analysis Of A Complicated Steel High-Rise Building

With the development of city construction, more and more beautiful high-rise buildings with diversification of structural style emerge. To the modern city, add a beautiful landscape on the basis of satisfaction for people's demand of use, and also bring some problems when doing structural design especially doing the analysis of seismic performance. Because of the characteristic and innovation of these structrual style, and unsuitability of traditional structural analysis method, it's a challenge for structrual engineer, hence it's necessary for specialized research and exploration. With the rapid development of computer analysis technology and FEA program, the anti-sesmic analysis of complicated project is possible, and this can greatly facilitate the structural design of complex high-rise building.In this dissertation, a complicated steel structure -Hangzhou international conference center is considered. Firstly, execute modal analysis of the structure to research its dynamic characteristics and analysis the vibration form, then find out the week position through partial modal. In addition, the affect of braces in different position and with different function to structural vibration form is studied.Secondly, execute spectrum analysis to study the dynamic response of this structure under moderate earthquake. make sure the modal steps for analysis, consider X direction and Y direction respectively, obtain the deformation style, maximum displacement, maximum relative displacement of the adjacent floors and stress distributing, compare the anti-sesmic capabilities of two different directions. Also, do elastic time-history analysis of the structure to compare with spectrum analysis, and get some results for project design.Thirdly, in order to get the elastic-plastic responses of the structure under heavy earthquake, elastic-plastic time-history analysis is performed. restoring force model and yield criterion are discussed. Get the displacement-time curve and the stress condition of the whole structure and the distributing of plastic point under different ground motion and under uni- and bi-directional input ground motion. Analysis of the stress condition is performed to the converted truss specially. Finally, explain some questions that must be paid attention to when we use ANSYS to perform elastic-plastic time-history analysis, including establishing model, controling analytic process, handling of results and so on, and the currently existing problems are also presented.