##### Page tree
Skip to end of banner
Go to start of banner

# Applying point, line, and area loads to bridge objects

Skip to end of metadata
Go to start of metadata

Tutorial
 Name: Applying point, line, and area loads to bridge objects Description: This tutorial demonstrates point-, line-, and area-load application to bridge objects. Program: CSiBridge Version: 15.0.0 Model ID: na

On this page:

# Model description

• Create a new model from template. Define as a simple span, 40m long, with steel girders cross-section.
• Release the bearing at the end abutment to achieve a simply supported condition.
• Define point, line, and area loads in separate load cases as follows:

• Point load: 10kN load applied at station 20, centered transversely.
• Line load: 1kN/m load applied between stations 15 and 25, centered transversely.
• Area load: 0.1kN/m^2 load applied between stations 15 to 25 and across the width of the deck.

These loads will all cause an effect equivalent to loading the bridge midspan with a 10kN point load
• Run the analysis and check the midspan moments. For point loading, the theoretical midspan moment is given as follows: Plan, elevation, and section diagrams depicting load application are given in Figure 1: Figure 1 - Load application diagrams

# Model development

## Define and apply loads

Use the Loads > Loads - Point command to define a new point load, as shown in Figure 2: Figure 2 - Define point load

Use the Bridge > Loads > Point Loads command to assign the previously defined point load, as shown in Figure 3: Figure 3 - Assign point load

Using a similar approach, define and apply line and area loads.

# Results

The moment diagrams below (Figures 4-6) depict the midspan moment expected. Figure 4 - Point load moment diagram Figure 5 - Line load moment diagram Figure 6 - Area load moment diagram