Study On Seismic Fragility Analysis For Reinforced Concrete Core Walls Structure

In recent years, Earthquake disaster occurred frequently in the global scope.High-rise building is the main part of city buildings in China, reinforced concrete corewalls by virtue of its excellent seismic performance,as the primary lateral force resistingunit in Multiple seismic lines for high-rise buildings, has been widely applied, butseismic performance research of reinforced concrete core walls is still insufficient.Performance-based seismic design research is continuously improved, from the form ofprobability to evaluate seismic performance of structural is the further developmenttendency. Seismic fragility analysis of structures describe the relationship of theintensity of ground motion and seismic response of structure from the point of the viewof the probability.The method has become a hot research field of earthquakeengineering and structural engineering.Therefore, it is of important theoretical andpractical significance to study seismic performance and fragility performance of corewalls. The main content is presented as follows.Multicomponent Incremental Dynamic Analysis (MIDA) method is proposed.Under the effect of horizontal orthogonal seismic load,the deformation capacity andductility performance of reinforced concrete core walls are seriously effected from thecoupling of structural seismic response.Defined the seismic incidence angle byHorizontal orthogonal ground excitation to consider the common influence of seismicintensity and seismic incidence Angle. Using the Latin hypercube sampling method toselected seismic recordings.Both reflects the random characteristics of ground motion,and also the universality of seismic. Multicomponent Incremental Dynamic Analysiswas carried out on the RC core walls structure by using the amplitude modulationseismic recordings MIDA method overcome the deficiency of the traditional onedimensional IDA method,Comprehensive analysis the reinforced concrete core walls seismic performance under the bidirectional earthquake load.The method of has thetheoretical significance and practical value for structural seismic performance researchand engineering design.The numerical simulation of reinforced concrete core walls seismic fragilityanalysis based on MIDA method.seismic fragility analysis was carried out on reinforcedconcrete core walls based on Multiple Incremental Dynamic Analysis.Obtaining theMIDA curve of the structure to study seismic performance of the reinforced concretecore walls structure.Four performance levels are put forward for reinforced concretecore walls through the reduce amplitude of amplitude of MIDA curve slope.Introducingfull probability standard deviation to consider structural uncertainty,and finallyobtaining the fragility curves of reinforced concrete core walls structure based on theprinciple of reliability,which to evaluate the fragility performance of structure.Thismethod can comprehensive assess the fragility performance of structure under differenthorizontal orthogonal ground motions which structure could suffer in the future.The multi-scale seismic fragility analysis on reinforced concrete core walls. Globaldamage is derived from the damage of materials and components unit under earthquake,the damage constitutive relation is one of the important indicators of material,and is alsothe basis for the structure finite element analysis. Considering the effect of materialcomposition and horizontal deformation of concrete, based on the uniaxial tensilemicroscopic spring-friction block model of concrete,the synthetic stochastic damageconstitutive equations of concrete material subjected to biaxial compressive-stress isderived,the calculated result is compared with the experiment data to testify the validityof the model, And applied to the finite element analysis model of reinforced concretecore walls,reflecting the structure damage performance from the perspective of materialmesoscopic. based on the research results existed on reinforced concrete core walls andnumerical method, the global damage model, which could reflect migration andevolution law from member damage to local damage and global damage, wasestablished through the reasonable assumption. Using damage index of globel structureas structural seismic demand parameters,which is from the perspective of damage, canassess the fragility performance of structure under different ground motions.