Seismic Performance Evaluation Of High-rise Hybrid Structure With Energy-dissipating Coupling Beam

The hybrid structures is one of the main structural types used in super high-rise buildings.On account of complex functions and dense population in this type of buildings,serious economic losses and threat of the people’s life safety will occur,if suffered serious damage in a large earthquake.Therefore,it is very important to control the damage and reasonable evaluate the seismic performance of this kind of buildings.At present,scholars in many countries often use energy dissipation beam to control the earthquake damage of this kind of structure.In view of the complexity of this kind of hybrid structures with energy dissipation coupling beams,how to reasonably evaluate its seismic performance needs systematic study.This may affect the seismic resilience of the city or region,which is the urgent demand of the government for the evaluation of seismic capacity and property loss.It is also the strategic requirement of the disasters’ prevention.For starting point,this paper is to control the seismic damage of the structure and to reasonably evaluate the earthquake resistance.Then according to the seismic field investigation.And the performance level and the index limit of hybrid structure and the main components are summarized.Finally,the seismic performance of high-rise hybrid structures with or without energy dissipation coupling beams are evaluated by using the summarized components performance indexes.The thesis mainly completed the following work:1)Based on the Seismic damage Classification of Buildings(GB/T 24335-2009),the experimental data and experimental phenomena in many relevant literatures are summarized and analyzed,and the performance level description of high-rise hybrid structures and components,including SRC column,SRC column-type steel beam joint and concrete core wall are given.The performance index limit of each component with84.13% guarantee rate is calculated.2)The stiffness formula of energy dissipation coupling beam is derived,the reasonable anchorage measures are given,and the quasi-static test of energy dissipation coupling beam is completed,which further verifies the accuracy of the formula and the effectiveness of anchorage measures.Based on the pseudo-static test results and the experimental data of energy dissipation beams in other literatures,the performance levels of energy dissipation beams are summarized and the limits of performance indexes are calculated.3)The finite element software is used to conduct dynamic time history analysis for high-rise hybrid structures with or without energy dissipation coupling beams.The results show that when the design stiffness of energy dissipation beams is equivalent to that of the original concrete beams and the design strength is 0.8 times that of the original concrete beams,the damping effect is the best.For the layout scheme in the structure,from top to bottom full energy dissipation beam damping effect is the best.4)The pseudo-static test of the core wall with energy dissipation coupling beam on6 stories of 1:2 scale is completed.The results show that the energy dissipation coupling beam delays the cracking of the core wall,increases the energy consumption of the core wall by 23.6%,and increases the limit displacement of the core wall by 80%.Referring to the phenomenon of this test,based on the standard of Seismic damage Grade Classification of Buildings,combined with the performance level classification basis of energy dissipation coupling beam given in this paper and the test results of other relevant literature,the performance level of core tube with energy dissipation coupling beam is summarized and the corresponding index limit is calculated.5)The performance level of high-rise hybrid structure with or without energy dissipation coupling beam is determined by using the method of judging structural performance based on component performance index and the method of judging structural performance based on material damage cloud distribution.The reliability of the evaluation results of the two methods in this paper is verified by using the existing shaking table test phenomenon.The results show that the energy dissipation beam has not started to work under the condition of small earthquake.Under moderate and large earthquake conditions,the failure state of high-rise hybrid structure can be reduced by one grade and the maximum drift can be reduced by 23%～26.3%.This study provides a method for evaluating the seismic performance of high-rise hybrid structures,a scientific basis for evaluating the seismic toughness of building structures before earthquake and carrying out emergency rescue after earthquake,and lays a foundation for relevant evaluation standards.