The Research On Vibration Reducing Performance Of Cylindrical Reticulated Mega-structure With Buckling Restrained Braces

The reticulated mega-structure as a new type of space grid structuresemerges as the times require,it has many advantages,such as clear transmission line,various forms,convenient construction and so on,it will be widely used.At present,the research of this structure mainly focuses on structure form,static performance,stability analysis,dynamic response and so on.The research on vibration control of structures needs to be further studied.Buckling restrained braces as a passive mild steel damper,it has simple model,clear mechanics concrept,full hysteretic curve and strong energy dissipation capacity.It’s feasible to apply it to reticulated mega-structure.In summary,this paper has mainly studied vibration reducing performance of cylindrical reticulated mega-structure with buckling restrained braces by using the time-history analysis method.The main contents are as follows:(1)The the staticperformance and natural vibration characteristics of cylindrical mega-structures are analyzed,it provides reference for the layout of buckling restrainedbraces in structures.And the arrangement principle ofbuckling restrained braces is put forward based on the mechanical properties and working principle ofbuckling restrained braces.(2)According to the arrangement principle of restrained buckling restrained braces,combined with the seismic response of structures under three-dimension EL-Centro seismic waves,we find out the key replacement member bar types in the structure by contrasting the seismic response of structure.On this foundation,8 kinds of seismic control schemes are formulated,the paper compares the seismic response of these structures under three-dimension EL-Centro seismic waves,include member bars’ axial force,nodal displacement and nodal acceleration.At the same time,considering the influence of thebuckling restrained braces’ quantity,layout and the seismic response of structures,the structure with the best damping effect is further studied.(3)Further studied on the damping effect of the above-mentioned structure under one-dimension EL-Centro seismic waves,three-dimension Taft seismic wave,three-dimension Tianjin seismic wave and different peak acceleration seismic waves,so as to verify the feasibility of buckling restrained braces applied to vibration control of cylindrical reticulatedmega-structure.