Design Parameter Analysis Of ECC Reinforced Concrete Shear Wall Structure

Engineered Cementitious Composites is a highly ductile fiber-reinforced cement-based composite material with fake strain hardening and multi-crack development mechanism.With uniaxial tensile load,its extreme tensile strain can be achieved at 3%-6%,almostly 300 times of concrete.In addition,the maximum width of the ECC crack at the limit is 100 microns,which can effectively avoid the durability problem of steel corrosion.In the micromechanics of the study,ECC is based on the analysis of the fiber,the matrix and the interface of the mechanical properties and the cooperation can improve the objectives of the material under the comprehensive consideration of the human development of new building materials.Compared to other high-performance concrete,ECC has a greater application advantage,which has widespread concern in the field of scientific research and engineering.At present,there are few cases at home and abroad on ECC reinforced shear wall components and ECC reinforced assembly shear wall structures,which are worthy of further study.Finite element analysis was used to simulate the structure of thirteen ECC reinforced shear wall structures and twenty-one ECC reinforced shear wall.The ECC constitutive relation is applied to the finite element software Abaqus,and the finite element model of ECC reinforced shear wall structure and ECC reinforced assembly shear wall structure is established.In this paper,the non-linear theory of ECC reinforced shear wall structure and ECC reinforced assembly shear wall structure is introduced,and the nonlinear calculation method of deformation of shear wall structure and the nonlinear calculation method of ECC shear wall deformation are introduced.The results of the Abaqus finite element are compared with the data of the test results and the phenomena in the test to verify the applicability and accuracy of the ECC constitutive relation.The main contents are load-displacement curve,hysteresis curve,concrete equivalent cumulative plastic strain cloud,concrete damage cloud and vertical reinforcement stress cloud.In addition,finite element analysis is used to study the effects of thirteen ECC enhanced assembly shear wall structure under low cyclic reciprocating load,differing from ECC height,ECC intensity,axial compression ratio,aspect ratio,longitudinal reinforcement grade and coupling girder ratio.And the performance of twenty ECC reinforced shear wall members on monotonic load and thirteen ECC reinforced shear wall members under the low-cycle reciprocating load are also research contents in this paper.The research results are as follows:The use of ECC and high strength concrete has a good effect on improving the bearing and deformation capacity of components and structures.The use of 40%of the lower part of the shear wall structure can delay the damage of components.The axial compression ratio should be 0.20～0.25,smaller the axial pressure ratio is conducive to the structure of the energy consumption and stiffness to maintain the situation.Longitudinal reinforcement grade HRB400 is appropriate,in regard to its energy consumption and stiffiness.To ensure that the situation is better,a slightly higher strength of the ECC material is useful of the mechanical and energy consumption performance of the yield and peak state.A closer stirrup configuration should be taken because dense stirrup configuration is conducive to the structure Of the energy performance and stiffness to maintain the situation.On the basis of the research,design suggestions and problems to be solved were given.