What are the techniques for retrofitting?

The following are the most common methods of retrofitting,

• Adding New Shear Wall.
• Adding Steel Bracing.
• Wall Thickening Technique.
• Base Isolation Technique.
• Mass Reduction Technique.
• Jacketing Method.
• Fiber Reinforced Polymer (FRP)
• Epoxy Injection Method.

What is retrofitting structure?

Retrofitting is the process of addition of new features to older buildings, heritage structures, bridges etc. Retrofitting reduces the vulnerability of damage of an existing structure during a near future seismic activity.

What are the types of retrofitting?

Such retrofits for RC buildings include steel braces, post-tensioned cables, infill walls, shear walls, masonry infill’s, and base isolators. Adding structural walls is one of the most common structure-level retrofitting methods to strengthen existing structures.

Which method is best for structural retrofitting?

There is a wide variety of modern methods used nowadays for Retrofitting of structural components, but the most commonly used, as well as the most efficient and cost-effective Retrofitting technique for this category, is undoubtedly Jacketing.

What are the materials used for retrofitting of concrete structures?

Cast-in-place ordinary concrete, fiber-reinforced concrete, shotcrete or gunite, self-consolidated concrete, and advanced mortars (polymeric or fiber enriched) comprise a class of materials widely used for the purpose of retrofit and strengthening of existing structures.

What is retrofitting in civil?

Retrofitting in the construction industry refers to the re-strengthening of the existing structures to make them seismic resistant. Retrofitting is an economic approach to increase the life span of an existing structure rather than redeveloping it.

Why is retrofitting needed?

Retrofitting reduces the vulnerability of damage of an existing structure during a near future seismic activity. It aims to strengthen a structure to satisfy the requirements of the current codes for seismic design. In this respect, retrofit is beyond conventional repair or even rehabilitation.

What is retrofitting in electrical?

Retrofitting focuses on reusing, refurbishing, recycling, and renewing electrical distribution equipment, rather than simply replacing it altogether. Electrical distribution retrofitting consists of replacing switchgear components to upgrade, renew, or provide more functionalities, such as connectivity.

Why retrofitting of concrete structures is important?

The retrofitting of concrete structures has become increasingly important in view aging and more deterioration of infrastructure. Retrofitting is the Science and Technology of strengthening the existing structures or structural elements to enhance their performance with new technology, features and components.

Is code for retrofitting of concrete structures?

1.1 This standard covers the selection of materials and techniques to be used for repair and seismic strengthening of damaged buildings during earthquakes. It also covers the damageability assessment and retrofitting for upgrading of seismic resistance of existing masonry buildings covered under IS 4326 and IS 13828.

What is retrofitting and rehabilitation of structures?

Rehabilitation is the process of returning a building or an area to its previous good conditions whereas retrofitting is the process of altering a building in retrospect to improve its performance characteristics.

What does it mean to retrofit a bridge?

Retrofitting of Bridges. Description: In repairing deteriorated concrete bridges the preliminary objective is to restore structure to its original shape. The need of retrofitting of existing bridges has a risen preliminary because of age of the bridge, adjacent construction, traffic load factor, weather and environmental factor, maintaince.

How is seismic retrofitting of a bridge done?

Methods of Seismic Retrofitting of Bridge Abutments Seat extenders and catchers Use concrete, steel, or timber to fill the gap between backwall and end diaphragm of bridge superstructure L bracket on superstructure soffit Shear Keys, Large CIDH Piles, Anchor Slabs, and Vertical Pipes

How is retrofitting used in the construction industry?

Retrofitting in the construction industry refers to the re-strengthening of the existing structures to make them seismic resistant. Retrofitting is an economic approach to increase the life span of an existing structure rather than redeveloping it. Cavity wall can be used for insulation.

How is post tensioning used in structural retrofitting?

This technique has been tested and used on new non-bridge structures for about 10 years. Unbonded post-tensioning high-strength steel helps increase the capacity of structural elements such as beams, columns, and the joints that connect them. This technique has been recently tested on bridges in California.