Design of Cantilever precast wall

Introduction

this wall's are usually provided for staircase and lift shafts. they are design as conventional rc walls, but the connection detail of vertical and horizontal joints transfer the compression , Bending moment and shear force.

Failure modes

1. Shear slip
    shear slip at the horizontal and vertical joints (when the L/h grater than 3 refer to below figure)

2. Flexural tension failure
    Due to large overturning moment & small axial load.  (refer to below figure)

3. Flexural compression failure
    Due to combination of Axial force and Bending moment. ( refer to below figure)

Design of Cantilever precast wall