Existing Concrete Shear Wall

The coe cient of normal force influence can have a value of 0 cw 1 25.

Existing concrete shear wall.

It s shown here after the soffit and some of the. Certain deficiencies such as inadequate lap splice length can trigger premature brittle failure of the walls. Different retrofitting techniques can be applied by using. Concrete shear wall buildings are usually regular in plan and in elevation.

This wall consists of the reinforcements and concrete slab. The changes are a result of the unsatisfactory performance of many shear walls in the chile earthquake of 2010 and the christchurch new zealand earthquake of 2011. 1 to the concrete surface with. This is the most common type of this walls.

The most common deficiencies observed in existing shear wall structure include short lap splice lengths of the longitudinal reinforcement in potential plastic hinge regions insufficient and poorly detailed transverse reinforcement and consequently inadequate shear strength required to develop hinging. Strengthening of existing reinforced concrete walls becomes necessary either when they lose their strength and capacity to take up the stipulated loads or when you need to increase their load carrying capacity. A sill that landed on a concrete stem wall retrofitting an engineered shear panel figure 1 in the original house built in the 1980s a 5 foot wide doorway linked the kitchen and family room. Modeling existing shear walls can be quite challenging.

Thick contain horizontal and vertical reinforcement and be properly bonded to the existing web of the shear wall. External steel reinforcement the shear capacity of concrete members such as columns beams slabs and shear walls can be increased by attaching steel plates fig. The wall thickness of rcc varies from the 150mm to 400mm. Types of the shear wall.

Figure 2 the wall between the two rooms was a shear wall. Those are the most common types of these walls. For walls designed in. The design and detailing requirements for special reinforced concrete shear walls have undergone significant changes from aci 318 11 to aci 318 14.

Concrete material as well as steel reinforcement should be modeled properly. The new concrete should be at least 4 in. The use of composite fiber sheets epoxied to the concrete surface is another method of increasing the shear capacity of a shear wall. This kind of rehabilitation is mostly required for walls constructed in high seismic zone areas.

The shear wall rebars start from the building foundation and end to the building top. All shear strengthening should be performed under the guidance of a licensed engineer familiar with the selected technique. Horizontal and vertical distributed reinforcement ratio 0 25 is required for all shear walls. Shear wall buildings are commonly used for residential purposes and can house from 100 to 500 persons per building.