Research On Seismic Behavior Of Uniform Corroded Reinforced Concrete Shear Wall Based On ABAQUS

Reinforced concrete shear wall is a kind of structural components to resist lateral force that is widely used in high-rise building structures,and its seismic behavior has enormous influences on the whole structure.In the natural and various corrosive environment,the seismic behavior of existing structures degenerates due to steel corrosion.But the corrosion of steel is often uneven,and the uneven corrosion has a huge impact on the seismic behavior of existing structures.So it is of great social and economic significance to estimate correctly the seismic behavior of existing reinforced concrete shear wall components and study in depth the uneven corrosion effects on the shear wall components,with strengthening in a timely and effective manner would reduce even avoid the losses.However,the current research on seismic behavior of uneven corrosion shear walls is less.In order to study in depth the seismic behavior of uneven corrosion shear walls,this paper totally designed the 46 specimens about shear wall components with different parameters using finite element numerical simulation method of ABAQUS.It is analyzed that corrosion position,corrosion rate,axial compression ratio,shear span ratio had an effect on seismic behavior of uneven corrosion shear walls.The main research contents and conclusions are as follows:(1)The finite element analysis to existing reinforced concrete shear wall under low reversed cyclic loading test were done.The theoretical calculations were basically identical with the test results about hysteresis curve,skeleton curve and the bearing capacity values,which verified the validity and reliability of the finite element model of shear wall.(2)The seismic behavior of the shear wall specimens under different corrosion position were analyzed comparatively.And it can draw the conclusion:Lower 1/3 rebars of shear wall and longitudinal bars of embedded column belongto the weak parts of the shear wall,because their corrosion has great impact on its seismic behavior.And it can be used as the typical corrosion parts for the further research of corroded components.(3)The seismic behavior of the shear wall specimens under different corrosion rate were analyzed comparatively.And it can draw the conclusion:The seismic behavior of the shear wall gradually reduces with the increase of corrosion rate.And 30% of the corrosion rate can be used as the typical corrosion rate of uneven corrosion shear wall for the further research of corroded components.(4)The seismic behavior of the shear wall specimens under different axial compression ratio were analyzed comparatively.And it can draw the conclusion:With the increase of axial compression ratio,the bearing capacity of the shear walls gradually increases,the deformation capacity of the shear walls gradually reduces,the stiffness degradation of the shear walls gradually accelerated.And the speed of deformation capacity reduction of corrosion shear walls is faster than it of uncorrosion shear walls.Under the same axial compression ratio,the seismic behavior of corrosion specimens get worse obviously than those of uncorrosion specimens.(5)The seismic behavior of the shear wall specimens under different shear span ratio were analyzed comparatively.And it can draw the conclusion:With the increase of shear span ratio,the deformation capacity of shear walls gradually increases,the bearing capacity of the shear walls gradually reduces,the influence of the deformation capacity,initial stiffness,bearing capacity,energy dissipation capacity caused by corrosion bars gradually reduces.Under the same shear span ratio,the seismic behavior of corrosion specimens get worse obviously than those of uncorrosion specimens.For the uncorrosion specimens,their energy dissipation capacity show a trend of decrease after the first increase.When it is 2.0 of shear span ratio,their energy dissipation capacity reach the maximum.For the corrosion specimens,the ability of energy dissipation gradually improves with the increase of shear span ratio.The influencing factors and parameters about seismic behavior of uneven corrosion shear walls are in depth analyzed.It provides the scientific basis for methods by improving every performance of shear walls,structure maintenances and optimal control of the shear walls.At the same time,it provides the theoretical basis for subsequent experimental research.