Concrete Bridge Project Essays
This project will discuss about some basic structure analysis of prestressed concrete bridge and design a newly footbridge according the structure design manual for highway department.
First, there …show more content…
The most common use of bridge truss is the Warren Truss.
A Warren truss can be identified by the presence of many equilateral or isosceles triangles formed by the web members which connect the top and bottom chords.
For smaller spans, no vertical members are lending the structure a simple look.
Unlike the beam, which without the tensile as well as compressive forces, a true arch is in a state of compression. That‘s mean it is strong in compression and weak in tension.
The arch profile is aesthetically pleasing and it provides a structure which eliminates tensile stresses in spanning an open space. This is useful because several of the available building materials such as stone, cast iron and concrete are strong in compression but are weak when tension.
Principles of prestressing:
Force transfer between the prestress tendon and the concrete achieves prestressing of the concrete member. Tendons are pulled and stretched and then anchored against the concrete, with the tension in the tendon being balanced by compression in the concrete. In this way an external compressive force is applied to the concrete and is used to counter the tensile stresses generated under the bending moments and shear forces present.
The prestress in a structure is influenced by either of the two