information immediate and long$-$term deflections for the example presented in Tutorial $2($Tutorial $2$

other applied loads.

Tutorial $2$

Background

This example is based on concrete bridge girders that were

designed, casted and tested up to failure as part of a linkage

project with the precast industry to study the economic and practical constraints of short production turnaround times, and

the competitiveness against steel girders. A solution was

and stiffness when releasing tensioning strands at an early age.

Tutorial $2$

Background

The active reinforcement was composed of twelve $\frac{3}{8}-$in prestressing bonded strands at the bottom and two $3/8-$in strands were initially strands at the top. The pretensioning strands were initially stretched to $1,446$MPa before the concrete was poured and were kept attached to the precast table until day $5.$ At day $5,$ the transfer took place and the post$-$tensioning strands were stretched to $1,100$ MPc$.$

The post$-$tensioning strands were only installed to avoid premature failure due to the high level of stress applied by the pretensioning strands at such an early age. Once the girders are finally taken to a construction site to erect a bridge, the post$-$tensioning strands are meant to be deal enough vertical load is applied to the structure.

Tutorial $2$

Geometry

Tutorial $2$

Tutorial $2$

Calcul