For inelastically responding superstructures, preferably the foundation system should be designed to remain elastic. For the axial load & moment , RCC Wall is designed similar to a RCC Column subjected to axial load & uniaxial moment. From SP16 chart , for Reinf. The choice of foundation systems depends on whether the seismic response of the superstructure during the largest expected earthquake is to be elastic or inelastic. In this way, loads are transferred vertically to the building's foundation. In other words, Shear walls are vertical elements of the horizontal force resisting system. The various walls and co-existing frames in a building are linked at the different floor levels by means of the floor system, which distributes the lateral loads to these different systems appropriately. Therefore, there are four critical failure mechanisms; as shown in Figure 1. Consequently for these structures provisions are to be made for energy dissipation, usually by flexural yielding. Typically, shear walls are constructed as lift core walls and around the staircases. The shear wall rebars start from the building foundation and end to the building top. 2: Steel plate shear wall If, the Shear wall is an exterior wall, then it will also carry the wind load & then it should also be design to resist the wind load and this load also get transfer to the foundation of the shear wall. The thickness of the shear wall for regular buildings can be generally in the range of 150 mm to 400 mm. Enter your e-mail address to subscribe to this website and receive notifications of new posts. The shear wall when placed in a single storey building must be constructed from the foundation to the roofline. The overturning effects on shear walls are quite large. Files > Download Footing Design of Shear Wall per ACI 318-14 - CivilEngineeringBible.com (FREE!) Assume , both ends fixed ( restrained against rotation & displacement ), L (eff.) The shear wall carries service dead and live loads of 10 kips/ft and 12.5 kips/ft respectively. Thus, design of their foundations requires special foundations. along two sides, Fe415 steel, d’/D = 0.1, Referring Chart 32, Area of Steel = 1.4 / 100 * 100 * 1000 = 1400 mm2. Examples are the reinforced-concrete wall. It is particularly important to ensure that any damage that might result in the foundation structure does not lead to a reduction of strength that might affect gravity load carrying capacity. Design criteria for each of these three foundation types are suggested. Therefore, moment due to accidental eccentricity of 20 mm is considered. thick structural reinforced concrete shear wall is to be supported by a strip footing. Reinforced Concrete Shear Wall Analysis and Design A structural reinforced concrete shear wall in a 5-story building provides lateral and gravity load resistance for the applied load as shown in the figure below. Basic Types of Stirrups for Concrete Work, Steps for Waterproofing a Terrace or Balcony. Shear wall section and assumed reinforcement is investigated after analysis to verify suitability for the applied loads. For elastically responding superstructures, suitable foundation systems may be energy dissipating, elastic or of the rocking type. In building construction, a rigid vertical diaphragm capable of transferring lateral forces from exterior walls, floors, and roofs to the ground foundation in a direction parallel to their planes. Concrete is poured into the formworks and removes after the standard time of formwork removal. It is vital that energy dissipation be assigned by the designer to areas within the superstructure or within the foundation structure in such a manner that the expected ductility demands will remain within recognized capabilities of the selected components. The load attracted to each component is a function of position and relative stiffness.
Whereas cantilever shear walls has a flexural behavior, the deflection is convex like a BMD of a cantilever beam, throughout the height of the wall. The thickness and the length of the walls are determined as per the design requirements. Functions of Shear Wall:. Since Vertical Reinforcement is less than 2 %, no horizontal links are required. Since cross walls are provided, the wall is braced.