Strength And Deformation Capacity Of Squat Recycled Concrete Walls Under Cyclic Loading

In order to provide an improved understanding of the load-carrying capacity, deformability,load-transferring mechanisms and failure modes of recycled concrete squat walls under earthquakeload, six recycled concrete squat walls with different axial load levels and reinforcing details aretested under cyclic loading. In this paper, the failure pattern, lateral load-drift hysteresis loops,characteristic loads and displacements, skeleton curves, stiffness degradation, strain of vertical andhorizontal reinforcement at various loading stages are obtained. The effects of axial load ratio,vertical and horizontal web reinforcement ratio, boundary element, and dowel reinforcement on thebehavior of squat walls are analysed. The design method of providing shear capacity larger than theshear force corresponding to flexural yielding in Chinese code is discussed. Based on the test results,the mixed flexure-diagonal compression mechanism and its analytical model are proposed, whichcan satisfactorily explain the load-transferring behavior of squat walls and accurately predict theultimate strength of squat walls failed in flexural-diagonal compression mode. Moreover, thedeformations of squat wall specimens are analysed. The contributions of flexural and sheardeformations to the top displacement in the whole loading stages are determined.