Experimental Study On Seismic Behavior Of High Ductility Fiber Concrete Low-rise Shear Wall

In the process of our urban construction and renovation, the bottom frame-theupper part of brick structure and at the bottom of large space-shear wall structure withthe conversion layer has been widely used. Due to height restrictions, as well as theunderlying framework of width and depth is relatively large, shear wall with large spacehigh-rise building underlying the shear span ratio is less than1of the low-rise shearwall. The depth-width ratio of low-rise shear wall is relatively small, and itsperformance is mainly controlled by shear force. The failure mode of low-rise shearwall is brittle shear failure, and seriously affects the seismic performance of this kind ofstructure in earthquake area.Engineering fiber reinforced Cementitious Composite (ECC) is a new kind ofstructure material. Because of the high strength, high ductility performance, outstandingcapability of absorbing energy, a significant strain hardening performance (deflectionhardening characteristics) and more cracking characteristics, which can remarkablyimprove the seismic capability and shear performance of structure. In order to improvethe ductility of low-rise shear wall, and effectively reduce the loss caused by theearthquake, this paper presents the use of ECC to improve the deformability of low-riseshear wall, which can prevent the brittle shear failure, thus significantly improve theseismic performance of the low-rise shear wall. The main research contents of this paperare presented as follows:(1) Test research on ECC material flexural behavior. Considering the effects offiber content, water-binder ratio, sand-binder ratio and fly-ash content,16groups of ductile high performance concrete specimens are designed, in which flexuralperformance is tested through the four-point bending test. In the analysis of first-crackstrength, ultimate flexural strength, equivalent flexural strength and toughness indexesof9groups specimens, the results indicates the matching ratio on ECC strength andductility.(2) Experimental Study on Seismic Behavior of ECC Low-rise Shear Wall. Inorder to improve the deformability of the high-strength concrete shear walls,2speciments of ECC low-rise shear wall with shear span ratios of0.9were desighed andthe quasi-static tests were carried out. To study the ECC low-rise shear wall’sdestruction process, failure mechanism, deformation and energy dissipation capacity,using ECC materials analyse the effect of improving low-rise shear wall failure modes,increasing the damage tolerance and reducing repair costs after the earthquake.(3) Nonlinear analysis of ECC low-rise shear wall. By ABAQUS finite elementssoftware, choosing suitable tension and compression damage constitutive relation andthe unit model, the finite element model of ECC low-rise shear wall is set up, whichproceed nonlinear finite element analysis. The results show that the reliability of thefinite element model was verified by the comparison of analysis results andexperimental results, and establishing the nonlinear model can well simulate themechanical properties of this shear wall specimens. By changing the strength of fiberconcrete, shear span ratio and axial compression ratio of design, it can analyse theseparameters of the influence of the shear wall seismic performance of ECC.