Research On Seismic Performance Of Easily Modularized And Fabricated High-rise Primary-secondary Structure System

High-rise primary and secondary structures with high lateral stiffness and high efficiency is a kind of structural system with broad application prospects.However,in the traditional primary and secondary structure,the internal force distribution of the secondary structure does not have periodicity along the height of the structure,and there are abrupt changes in the internal force nodes,which is not conducive to the modular design of the secondary structure and the layout of assembled energy-dissipating nodes,and the ductility of the main structure column is low due to the existence of giant supports.Therefore,this paper proposes a new type of primary and secondary structure system which can reasonably utilize the dissipated energy of the secondary structure,facilitate the modular design of the secondary structure,and improve the ductility of the main structure column.The main research contents are as follows:Design of modular primary-secondary structure system based on optimization of secondary transfer of internal force.By changing the layout of the secondary structure,the internal force transfer between the main structure and the secondary structure is more differentiated,in which the internal force distribution of the secondary structure is periodic,and its size can be copied along the height of the structure,which is easy to be modularized.Based on the new type of primary and secondary structure with optimized secondary structure layout,the characteristics of internal force distribution and the influencing factors of stiffness of the primary and secondary frame-support structure system are analyzed,and a concept of degenerate support of bearing capacity which is beneficial to the ductility of the main structure column is proposed.Design and mechanical analysis of shear key brace.Based on the purpose of improving the ductility of the primary structural column,a shear key support which can degrade the bearing capacity through bolt shear and dissipate energy through viscous liquid damper is developed.The factors influencing the ultimate bearing capacity of shear bond support are obtained through numerical analysis,and its construction requirements and design formulas are proposed.Finally,thecomparison between shear bond support and anti-buckling support proves that the degradation of shear bond support can significantly reduce the damage development at the bottom of the column and improve the ductility of the main structural column.Nonlinear analysis of primary-secondary structures with assembled energy dissipation nodes.Based on the modularized primary and secondary structure system,which optimizes the secondary distribution of internal forces,the influence of the different arrangement of prefabricated energy-dissipating nodes at the end of the secondary structure beam on the plastic development order of each member in the structure is analyzed,and the improvement of the performance of the whole structure by the prefabricated nodes is verified.Based on the arrangement of assembled energy-dissipating nodes at the end of substructure beam,the influence of the arrangement of shear key support on the plastic development of each member and the ductility of the main structure column compared with the traditional support is analyzed,and the improvement of the overall performance of the structure by shear key support is verified.