Mesoscopic investigation on seismic performance of corroded reinforced concrete columns  

作　　者：Jin Liu Li Yanxi Zhang Renbo Du Xiuli 

机构地区：[1]Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100024,China

出　　处：《Earthquake Engineering and Engineering Vibration》2022年第4期969-985,共17页地震工程与工程振动（英文刊）

基　　金：National Natural Science Foundation of China under Grant Nos.51822801 and 51978022。

摘　　要：In addition to the normal service loadings,engineering structures may be subjected to occasional loadings such as earthquakes,which may cause severe destruction.When the steel rebar is corroded,the damage could be more serious.To investigate the seismic performance of corroded RC columns,a three-dimensional mesoscale finite element model was established.In this approach,concrete was considered as a three-phase composite composed of aggregate,mortar matrix and interfacial transition zone(ITZ).The nonlinear spring were used to describe the bond slip between steel and concrete.The degradation of the material properties of the steel rebar and cover concrete as well as the bonding performance due to corrosion were taken into account.The rationality of the developed numerical analysis model was verified by the good agreement between the numerical results and the available experimental observation.On this basis,the effect of corrosion level,axial force ratio and shear-span ratio on the seismic performance of corroded RC columns,including lateral bearing capacity,ductility,and energy consumption,were explored and discussed.The simulation results indicate that the mesoscopic method can consider the heterogeneity of concrete,to more realistically and reasonably reflect the destruction process of structures.

关 键 词：reinforcement corrosion reinforced concrete column MESO-SCALE finite element analysis seismic behavior 

分 类 号：TU375.3[建筑科学—结构工程] TU352.11