What is Super Imposed Dead Load means? What are loads that needs to be considered as SIDL for a metro viaduct bridge?

Superimposed Dead Load (SIDL) refers to the non-moveable (static) loads that are added to the structure after the construction is completed. These loads are not part of the structural components of the building or bridge. They include utilities, pavement, sidewalks, parapets, and other elements that are added onto the structure after the initial construction.

For a metro viaduct bridge, the following loads need to be considered as Superimposed Dead Load:

1. Track and track bed: The weight of the track and the materials used for the track bed are considered as SIDL.

2. Utilities: Any utilities that are added to the bridge, such as water pipes, electrical lines, etc., are considered as SIDL.

3. Pavement: If the bridge has a roadway, the weight of the pavement is considered as SIDL.

4. Sidewalks: If the bridge has sidewalks, the weight of the sidewalks is considered as SIDL.

5. Parapets and railings: The weight of any parapets or railings that are added to the bridge are considered as SIDL.

6. Station structures: If there are any station structures on the bridge, their weight is considered as SIDL.

7. Other elements: Any other elements that are added to the bridge after the initial construction, such as signage, lighting, etc., are considered as SIDL.