Stiffness Of Concrete Shear Wall

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.

Stiffness of concrete shear wall. Rigid diaphragm rr 4 rr 5 rr 1 50 ft 50 ft wall 1 wall 2 wall 3 x wall x rr x rr 1 2 3 total center of stiffness 350 10 35 ft. Shear walls perform dual action that is theyas lateral as well as gravity load bearing elements. Shear wall stiffness 9 1 5 2 deflection calculations shall be based on cracked section properties. 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.

Assumed properties shall not exceed half of gross section properties unless a cracked section analysis is performed. 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. Shear walls provide adequate strength and stiffness to control lateral displacements.

Fully grouted shear wall required. The typical load combination tab for strength design of concrete is provided. Recommendations for frame stiffness are provided in table 4 1 pauley and priestley. Wall summary stresses tab.

In the top portion you will see the calculated shear moment and axial loads at the analysis height you have specified. Paulay and priestley provide recommendations for stiffness modifiers for cracked concrete frame members and shear walls. Concrete shear wall buildings are usually regular in plan and in elevation. Determine stiffness from basic principles.

Shear wall buildings are commonly used for residential purposes and can house from 100 to 500 persons per building. In their discussion of stiffness modifiers for frame members they emphasize the inherent approximation in the use of stiffness modifiers. Shear stiffness the effective shear stiffness for the elastic range of bi linear idealisation is defined by a reduction factor v as fol lows. Definition of yield and ultimate deformations of a wall specimen.

Shear walls 33 solution.