## What type of foundation is used for bridges?

The most common way to construct a deep foundation for a bridge is called piling. Long, narrow posts called piles are hoisted into the air by a crane and driven into the ground by a large hammer called a piledriver (not that piledriver). After the pile reaches the required depth, it is capped off and tied.

What is a spread footing used for?

Spread footings are used to support a foundation or set of piers below a building. To add additional support, spread footings are constructed with concrete and reinforced with steel.

### What is the minimum depth of foundation for Spread Footing?

However, there are code specified minimum value of different type of foundations. Followings are two code references (ACI and BNBC) for minimum thickness value of concrete footing. Depth of footing above bottom reinforcement shall not be less than 150 mm for footings on soil, nor less than 300 mm for footings on piles.

What are the factors to be considered in choosing the type of footing to be used in a certain building?

Selection of Type of Foundation

• Adequate depth. The foundation must have an adequate depth to prevent frost damage.
• Bearing capacity failure. The foundation must be safe against a bearing capacity failure.
• Settlement.
• Quality.
• Seismic forces.

#### What is the function of bridge foundation?

A Bridge foundation or Bridge Pier is provided to holds the bridge span and transmit the load to the ground. This simply means that the Bridge Foundation needs to be robust enough to not only holds the vertical load of the substructure but also holds the lateral stress of the bridge span.

Which forms the most common type of deep foundation for bridges?

___________ forms the most common type of deep foundation for bridges. Explanation: In India, well foundation forms the most common type of deep foundation for bridges.

## How do you calculate Spread Footing?

Isolated Spread Footing: By dividing the total load at the column base by the allowable bearing capacity of the soil the size of the footing can be roughly calculated.

What are the typical modes of failure of a concrete footing?

Bending failure, shear failures, and a puncture of the concrete.

### What are the six types of foundations?

Following are different types of foundations used in construction:

• Shallow foundation. Individual footing or isolated footing. Combined footing. Strip foundation. Raft or mat foundation.
• Deep Foundation. Pile foundation. Drilled Shafts or caissons.