# What Is Simply Supported Beam In Civil Engineering?

In civil engineering, a simply supported beam is a common and fundamental structural element. It consists of a beam that rests on two supports, with one end being a pinned support and the other end being a roller support. This configuration allows the beam to freely rotate and expand or contract axially, making it versatile for various applications.

Simply supported beams are widely used in civil engineering, playing a crucial role in structures such as bridges, buildings, and machine tools. They are considered determinate structures, meaning that the number of unknown reactions is equal to the number of equilibrium equations. This characteristic simplifies the design and analysis process.

The internal actions in a simply supported beam include axial force, transverse shear force, and bending moment. The axial force is generally zero in a simply supported beam, as it can freely expand or contract. However, the shear force and bending moment can vary along the length of the beam, impacting its structural behavior and load-carrying capacity.

### Key Takeaways:

• A simply supported beam is a commonly used structural element in civil engineering.
• It consists of a beam that rests on two supports, one pinned and one roller.
• Simply supported beams are determinate structures, simplifying the design and analysis process.
• Internal actions in simply supported beams include axial force, transverse shear force, and bending moment.
• Understanding simply supported beams is essential in civil engineering design and analysis.

## Support Configuration of Beams in Civil Engineering

Beams in civil engineering can have different support configurations depending on the specific requirements of the structure. Understanding the various types of support configurations is crucial for designing and analyzing beams effectively. The most common types of support configurations are:

1. Simply Supported Beam: This type of beam has two supports at either end – one pinned and one roller. It is the simplest and most common type of beam in civil engineering.
2. Cantilever Beam: A cantilever beam is supported from one end using a fixed support. This configuration is typically used when a beam needs to be extended or projected beyond its support.
3. Continuous Beam: A continuous beam has multiple supports along its length. This configuration allows for greater stability and load-carrying capacity compared to simply supported beams.
4. Fixed Beam: A fixed beam has fixed supports at both ends, offering moment resistance. This configuration is used when precise control of deflection and rotation is required.
5. Overhanging Beam: An overhanging beam has two supports, but one of the supports is not at the end of the beam. This configuration is often used in structures where an extension or addition is required.

Each support configuration has its advantages and limitations, and the choice of configuration depends on the specific requirements of the project. By understanding the different support configurations, civil engineers can design beams that can efficiently carry loads and ensure the structural integrity of the overall construction.

Support ConfigurationDefinitionApplications
Simply Supported BeamA beam with two supports at either end – one pinned and one roller.Bridges, beams in buildings, machine tools
Cantilever BeamA beam supported from one end using a fixed support.Overhangs, balconies, continuous spans with one end fixed
Continuous BeamA beam with multiple supports along its length.Large-span structures, bridges, multi-story buildings
Fixed BeamA beam with fixed supports at both ends.Industrial structures, buildings with strict deflection control
Overhanging BeamA beam with two supports, one not at the end of the beam.Extensions, additions to existing structures

## Internal Actions in Simply Supported Beams

When it comes to simply supported beams in civil engineering, it is essential to understand the internal actions they experience. These internal actions play a crucial role in determining the structural behavior and design considerations for these beams.

One of the primary internal actions in a simply supported beam is the axial force. In this type of beam, the axial force is generally zero because the beam is free to expand or contract axially. However, it is important to consider axial forces in other types of beams where the supports may restrict axial movement.

Another significant internal action is the transverse shear force. This force varies along the length of the beam and is typically highest at the supports. Understanding the distribution of transverse shear forces is crucial for determining the load-carrying capacity and shear reinforcement requirements of the beam.

The bending moment is yet another internal action that must be considered in simply supported beams. The bending moment varies along the length of the beam and is generally highest at the mid-span. It is essential to analyze and design the beam to withstand these bending moments to ensure structural integrity and prevent failure.

## FAQ

### What is a simply supported beam in civil engineering?

A simply supported beam is a common type of beam used in civil engineering. It is defined as a beam that rests on two supports, with one end being a pinned support and the other end being a roller support.

### What are the different support configurations of beams in civil engineering?

The most common types of support configurations for beams in civil engineering are simply supported beam, cantilever beam, continuous beam, fixed beam, and overhanging beam.

### What are the internal actions in simply supported beams?

The internal actions in simply supported beams include axial force, transverse shear force, and bending moment. The axial force is generally zero, while the shear force and bending moment can vary along the length of the beam.

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