| Title |
Shear Strength of Low-Rise Reinforced Concrete Shear Walls |
| Abstract |
Results of 124 tests of low-rise reinforced concrete shear walls, with an aspect ratio / less than 1.0, are reviewed to evaluate the current design provisions for nominal shear strength( ). In addition, the influence of the amount of reinforcement, axial force, and concrete strength on the shear strength of low-rise Rc walls is discussed.Provisions of domestic code(KSD code) and ACI 318-89 pertaining to seismic shear design of structural walls in low-rise construction are found to underestimate the strength of lightly reinforced shear walls and tend to overestimate the strength of walls with . more than 30kg/cm2( :horizontal web reinforcement ratio, :horizontal web reinforcement yield strength). The results indicate that the shear strength of the walls is observed to increase with an increase in the amount of vertical reinforcement in the web, and that KSD code and ACI 318-89 expressions do not incorporate the actual shear resisting mechanism of low-rise walls with / less than 1.0.In the paper, a shear friction model is applied to evaluate the shear strength provided by the vertical reinforcement, the actual shear resisting mechanism of low-rise walls. The nominal shear stress attributed to shear friction overestimated the maximum average shear stress, but a good estimate of lower bound to the maximum average shear stress was provided by /4. The presence of inclined cracks in the wall and the applied bending moments are the likely reasons for the overestimation of shear strength using the shear friction analogy. |