Cable-stayed bridges are structural systems effectively composing cables, main girders and towers. This bridge form has a beautiful appearance and easily fits in with the surrounding environment due to
the fact that various structural systems can be created by changing the tower shapes and cable arrangements.
To determine the cable prestress forces that are introduced at the time of cable installation, the initial equilibrium state for dead load at the final stage must be determined first. Then, construction stage analysis according to the construction sequence is performed.
In general, with forward construction stage analysis, we cannot obtain cable pretension loads for each stage which satisfy the initial equilibrium state at the final stage. By using cable pretension loads resulting from backward stage analysis, we can perform forward stage analysis. However, newly added function, Lack-of-Fit Force finds cable pretension loads for each construction stage from cable pretension loads at the final stage wit hout backward stage analysis.
This tutorial explains techniques for modeling a cable-stayed bridge, calculating initial cable prestress forces, performing construction stage analysis and reviewing the output data. The model used in this tutorial is a three span continuous cable-stayed bridge composed of a 110 m center span and 40 m side
Cable- stayed bridges are structural systems effectively composed of cables, main girders and towers. This bridge form has a beautiful appearance and easily blends in with the surrounding environment due to the fact that various structural systems can be created by changing the tower shapes and cable arrangements.
Cable-stayed bridge is a bridge type where inclined cables transfer member forces induced in the girder. High compression is induced in the tower and main girder due to the structural system. Considering the above features, PC cable- stayed bridges using Prestressed Concrete material for the main girder, have following advantages :