There is a confusion about the designing and detailing about shear walls
A 21 Storied Building has shear walls and moment resisting frame. Structural system selected as "Dual System", while analyzing the shear wall in a FEM software it requires "Special boundary elements" because the stress level in Earthquake load combination which is about 1900psi in the pier which exceeds the limit of 0.2fc' (e.g. fc' =4000psi, 0.2*4000psi=800psi) as per the section of ACI 18.10.6 Reference code: ACI 318-14
As per the section ACI 18.10.6 "Boundary elements of special structural walls" Special Boundary elements are required as shown in FEM results of the shear wall pier as per the ACI 18.10.6.2 or 18.10.6.3. As per ACI 18.10.6.3 if compressive stress exceed 0.2fc' in a pier, it will require special boundary element which is applicable in this case, and also the neutral axis depth exceeds the limit to require boundary element. Results are shown in the figure below.
Now as per the relevant ACI 18.10.6.4, The boundary element should extend upto greater of (c-0.1lw and c/2) which is almost about 80 inches as shown in the FEM results of pier.
Now , While designing the shear wall it will have transverse reinforcement about over total length having transverse reinforcements as per "ACI Table 18.10.6.4(f)—Transverse reinforcement for special boundary elements" e.g. typical detail will be as shown
So, Dear Engineers am I right or wrong? am I interpreting the codal requirements in a right way?
does any one can share a typical detail of a shear wall of building having stories about 21 stories including shear walls, or more specifically having structural system of Dual system? If material properties are also included it would much appreciated, thank you.
A 21 Storied Building has shear walls and moment resisting frame. Structural system selected as "Dual System", while analyzing the shear wall in a FEM software it requires "Special boundary elements" because the stress level in Earthquake load combination which is about 1900psi in the pier which exceeds the limit of 0.2fc' (e.g. fc' =4000psi, 0.2*4000psi=800psi) as per the section of ACI 18.10.6 Reference code: ACI 318-14
As per the section ACI 18.10.6 "Boundary elements of special structural walls" Special Boundary elements are required as shown in FEM results of the shear wall pier as per the ACI 18.10.6.2 or 18.10.6.3. As per ACI 18.10.6.3 if compressive stress exceed 0.2fc' in a pier, it will require special boundary element which is applicable in this case, and also the neutral axis depth exceeds the limit to require boundary element. Results are shown in the figure below.
Now as per the relevant ACI 18.10.6.4, The boundary element should extend upto greater of (c-0.1lw and c/2) which is almost about 80 inches as shown in the FEM results of pier.
Now , While designing the shear wall it will have transverse reinforcement about over total length having transverse reinforcements as per "ACI Table 18.10.6.4(f)—Transverse reinforcement for special boundary elements" e.g. typical detail will be as shown
So, Dear Engineers am I right or wrong? am I interpreting the codal requirements in a right way?
does any one can share a typical detail of a shear wall of building having stories about 21 stories including shear walls, or more specifically having structural system of Dual system? If material properties are also included it would much appreciated, thank you.