Seismic Design Approaches And Dynamic Characteristic Analysis Of Typical Passive Energy Dissipation Systems

In the field of high-rise structural design,all kinds of structural system such as Frame,Frame-shear Wall and Bearing Frame Structure,whose theory system have developed quite mature.But due to the improvement of diversification of building function and complexity of the shape,the application of those structural systems have been limited.Adding additional energy dissipation device in the traditional earthquake and strong winds resistance of high-rise and super high-rise building structure system as a new model has been developed.As the research object,based on transfinite high-rise building configured with viscous flow damper and buckling-restrained brace,making a research about the energy dissipation mechanism,application methods of the two energy dissipation components and the seismic response,dynamic characteristics of the whole structure,the main work and results were as follows:1.The mechanics characteristics and application researches of viscous flow dampers and buckling-restrained braceThe structure principle,energy dissipation mechanism of viscous flow damper and buckling-restrained brace are introduced,mechanical properties of the two energy dissipation components are showed through cyclic loading test intuitively and introduces the commonly used mechanical model.The implementation process of two energy dissipation components are summarized through traditional seismic design method.2.Development of visual software which can compound artificial earthquake wave and verify its practicabilityTo meet the requirements of specification when analyze the structure by time-history method,introduced the adjustment method of natural seismic wave and synthesis principle of artificial seismic wave further through the selection principle of seismic wave.Developed a visual software which can compound artificial earthquake waves based on Graphical User Interface of Matlab and verified that it can be use to calculate the structure with time-history method compared with the calculation results with natural earthquake wave and response spectrum method.3.Earthquake response analysis of transfinite high-rise building configured with viscous flow damper and buckling-restrained braceAs the engineering background in new campus of Hebei university of technology library project,the finite element modeling of the structure were made by ETABS,using the mode-superposition response spectrum method and time-history method for structural dynamic characteristics and seismic response analysis,to calculate vibration periods,interlayer displacement and story shear force et al.data,combined with the standard to evaluate the stiffness of the whole structure,and analyzed the energy dissipation feature and time-history of viscous flow damper and buckling-restrained brace.Results show that the transfinite high-rise structure configured with two energy dissipation components conform to the requirements of the specification design,viscous flow dampers can dissipate energy stably and buckling-restrained brace can can provide structure larger lateral stiffness under small earthquakes,buckling under rare earthquakes.4.Dynamic characteristics analysis of transfinite high-rise building configured with viscous flow damper and buckling-restrained braceThrough the pulsation testing of the project,got the physical model of structure after data processing.The structure parameters such as natural frequency,damping ratio and vibration mode were analyzed,compared with the finite element model,further evaluation of two kinds of energy dissipation components were made of the structure.Analysis showed that buckling-restrained brace provide the structure bigger stiffness than calculation model so that the fundamental frequency change for X.due to the discreteness of data processing and damping ratio identification method and coupled with a small structure amplitude,viscous flow dampers do not play a good effect in the experiment and structural damping ratio is small;Through comparison of the coefficient of vibration mode,which shows that the stiffness is well-distributed in all layer and direction of the overall structure.