Stiffness Of Concrete Shear Wall

Shear walls provide adequate strength and stiffness to control lateral displacements.

Stiffness of concrete shear wall.

Shear wall stiffness 9 1 5 2 deflection calculations shall be based on cracked section properties. Stiffness of wall solution. Shear stiffness the effective shear stiffness for the elastic range of bi linear idealisation is defined by a reduction factor v as fol lows. A series of nonlinear analyses are performed for shear wall under wind and gravity loading considering well known constitutive relations for concrete including the tension stiffening behavior.

Shear walls perform dual action that is theyas lateral as well as gravity load bearing elements. K v eff k 1 where k v eff denotes the secant shear stiffness at the yield state and k v is the uncracked shear stiffness defined in park. Aci 318 11 proposes taking the effective stiffness of cracked wall sections to be 0 35 of the elastic stiffness of the section and the uncracked stiffness to be 0 70. Shear walls 8 40in.

In their discussion of stiffness modifiers for frame members they emphasize the inherent approximation in the use of stiffness modifiers. Fully grouted shear wall required. Recommendations for frame stiffness are provided in table 4 1 pauley and priestley. Determine stiffness from basic principles.

Concrete shear wall buildings are usually regular in plan and in elevation. Wall summary stresses tab. Definition of yield and ultimate deformations of a wall specimen. Paulay and priestley provide recommendations for stiffness modifiers for cracked concrete frame members and shear walls.

Shear wall buildings are commonly used for residential purposes and can house from 100 to 500 persons per building. The typical load combination tab for strength design of concrete is provided. Assumed properties shall not exceed half of gross section properties unless a cracked section analysis is performed. In the top portion you will see the calculated shear moment and axial loads at the analysis height you have specified.

The present aci 318 11 code provisions on the effective stiffness of shear wall as well as several other standards and technical papers are reviewed.