Seismic Performance Analysis Of Base-isolated And Energy-absorbing Frame-shear Structures

As we know,high-rise buildings and super high-rise buildings have unparalleled superiority in urban architectural design planning and they are favored by decision makers continuously.The building height is also being refreshed and broke through again and again.The traditional seismic design method follows the design level of “small earthquakes are not bad,moderate earthquakes can be repaired,and large earthquakes do not fall”,and through the “two-phase design” to achieve the above-mentioned level of fortification goals mainly.It is neither economical nor safe enough.It is the drawback of traditional seismic design.Especially for high-rise buildings that important or have a landmark significance or store precision instruments and equipment,the safety and reliability of their structures are important crucially.For high-rise buildings or super high-rise buildings,when the earthquake comes,it will be subjected to greater and more severe tests.Once it fails the test,the consequences will be disastrous.In order to effectively solve the above problems,based on the traditional seismic design,this paper also used a combination of base isolation technology and energy dissipation technology,that is,placing the lead-core rubber isolation bearings at the base of the building for base isolation,and at the same time installing the energy-consuming components in its superstructure reasonably for energy dissipation.As the high-rise frame-shear wall structure is under earthquake,the rigidity of the structure in the transverse direction is small relatively,and its seismic performance is weak.Therefore,the energy-consuming components are installed on both sides of the structure in a rational manner,and its effect will be obvious.It does not affect the cycle of the structure.It only consumes the energy input into the superstructure quickly and effectively under the action of the earthquake.At the same time,it increases the damping of the structure,and then improves the technical shortcomings of the base isolation,improves the seismic performance of the structure greatly.It ensures the safety and reliability of the structure.This is the innovation of this article.In order to demonstrate the innovation,the article collects and consults a large amount of literature and data to understand the mechanical properties of rubber isolation bearings and viscous dampers firstly,and learns the working mechanism of the base-isolated structural system and the energy-absorbing and shock-absorbing structural system,and then use the large finite element analysis software MIDAS GEN to build four kinds of structural models for the main building part of the experimental building of a university(1st basement,21 st floor above ground).There are non-vibration-reducing structure,energy dissipation structure,base-isolated structure,base-isolated structure and energy dissipation structure(hereinafter referred to as "hybrid shock absorber structure").And then do the eigenvalue analysis and the dynamic time history analysis of the model,and the results were compared and evaluated.According to the study of the article,it can be seen that the basic seismic isolation technology and energy dissipation technology are combined reasonably and used flexibly in the structure.At the time of the earthquake,it not only can eliminate the impact of the earthquake action on the structure quickly,but also can be effective to ensure the safety of people in buildings while minimizing the loss of social property,so it has good economic and social benefits.Therefore,the hybrid shock absorption technology has a very broad development and application prospects.