Effect of initial sag and tension in cables on outcome responses in cable structures

الملخص EN

The main object of this research is concerned about the effect of both initial sag and initial tension in inclined cables on the outcome responses of some cable structures, such as cable stayed bridges and guyed towers.

A new technique for the choice of the best initial tension in cables depending on an iterative scheme to give the minimum static responses.

This technique is termed ''optimum outcome response shape'.

The static analysis of cable stayed bridges having three spans with single cables in harp, radiating and fan shapes, which represent the most common bridges, and guyed towers, is carried out.

Two cases of loading which include the most dominant symmetric and asymmetric traffic loads with four cases of connections types between pylons and floor beams are considered in the analysis of the bridges.

Also, the case of wind load with mean wind speed of 150 km / hour at 10 m, above the ground is considered for guyed towers.

Both static and dynamic analyses are carried out taking into consideration geometric and material nonlinearities.

In both static and dynamic analyses, the energy method, based on the minimization of the total potential energy of structural elements, via conjugate gradient technique is used.

The procedure is carried out using iterative steps to acquire the final configurations.

All prepared computer programs in FORTRAN language for this work are written by the author which programs have a high reliability when compared with other prepared programs in this field.

The major conclusions which give a significant reduction in the outcome responses, have been drawn..