Are you looking for a BS 5400 bridge design? BS 5400 is made up of several parts that contain all the information that must be considered when designing a bridge. Specifications for bridges, loads and other relevant information can be found in the code.
In general, the main task of a concrete bridge is the construction of the prefabricated beams. Depending on the type of load on the beam, prefabricated beams are divided into prestressed beams and prestressed beams.
First, the conveyor is designed for the transfer phase and the operational phase. Depending on the load on the bridge and the weight of the beams, pre- and post-tensioning forces are selected for both methods. Finally, the maximum bending moment and shear capacity are determined.
The following diagrams show the methods for calculating voltages in the transmission phase and in the operation phase. Sign convention: positive movement; Negative pressure
From the above equations, four equations can be derived to find the prestressing force and eccentricity (where the cables are placed) by drawing the graphs of “e” Vs 1/Pe. In the initial phase, preload losses of around 15% are assumed and verified later.
If the eccentricity and effective preload force are known, the maximum bending moment can be calculated using basic principles (strain compatibility method, etc.) or using the equations provided in the code. Shear design can also be done using the cracked and uncracked section equations provided in the code.
The design of the prestressed beam for the ultimate limit states is described in the article Bridge beams It may be useful to know the method for calculating the beam's maximum resistive moment.
The article prestressed composite beams For more information, see the technical explanations and the worked example for cold construction.
