Analysis of influencing factors on the skeleton curve for fully grouted reinforced concrete masonry shear walls

To determine the shear-resistance performance and deformability of 290 mm-width fully grouted reinforced concrete masonry(FGRM) shear walls under different failure modes,ten full-scale walls were tested firstly under low cyclic reversed lateral loads simulated by a 1 000 kN jack providing constant axial load and a 630 kN servo controlled hydraulic actuator producing low cyclic reversed lateral loads.The seismic performance of walls bearing compress,shear and flexure is studied.Meanwhile,the skeleton curves of FGRM shear walls based on the data recorded in the tests are investigated considering different factors including the axial compressive stress,the horizontal reinforcement,the vertical reinforcement,et al.It is demonstrated that,firstly,both the shear and deformation capacity can be improved as the axial compressive stress increases within a certain range.Secondly,the impact of horizontal reinforcement on the shear-resistant performance of walls is related to failure modes of the wall.Compared with the flexural failure mode,a much higher shear capacity but a worse ductility is derived in a shear failure mode when the walls are confirmed with higher horizontal reinforcement.Finally,the wall shear capacity is influenced significantly by the vertical reinforcement whose effects on ductility are associated with the applied axial stress.