Midas Civil Construction Stage Analysis
In Midas Civil is possible to consider the effects of creep, shrinkage and relaxation of steel during the construction stage, this time dependent properties of the concrete and steel are defined following the recommendations given by the CEB-FIP, the development of phenomena is studied for a period of 50 years. Table 3-3 shows the results for creep coefficient and shrinkage strain for both concretes C5000 and C6000, and figure 5-5 shows the plot for the data for concrete C6000.
To simplify the calculations, deformation of the foundation are not considered in the model; thus, the supports of the piers are constrained in the 6 degrees of freedom.
The loads considered during construction are the self-weight of the structure, erection loads due …show more content…
In Construction Stage 1, both piers are activated together with the pier-tables. The boundary conditions for the base of the piers as restrained in 6 degrees of freedom and rigid elastic links for the connection between pier and girder is defined. The loads applied in this stage are due the form travelers for the segments 1 at the first day of the stage, and the weight of the wet concrete for the segments 1 at the 4th day.
In Construction Stage 2, segments 1 are activated. No new boundary conditions are necessary for this stage. The loads applied in this stage are due the form travelers and the weight of the wet concrete for the segments 2, applied at the same time range specified in the previous stage, also the prestressing loads from the cantilever tendons for segments 1 are applied when the concrete has an age of 3 days. The loads due to the form travelers because the form travelers have been moved into position for the next segments, and the weight of the wet concrete for the segments 1 are deactivated because the segment has been already activated and the self-weight is considered. The duration of this construction stage is 7 …show more content…
The displacement shown in the figures are the total displacement, which is the result from the combination of the displacements in x, y and z direction using the Square Root of the Sum of the Squares procedure
To simplify the calculations, deformation of the foundation are not considered in the model; thus, the supports of the piers are constrained in the 6 degrees of freedom.
The loads considered during construction are the self-weight of the structure, erection loads due …show more content…
In Construction Stage 1, both piers are activated together with the pier-tables. The boundary conditions for the base of the piers as restrained in 6 degrees of freedom and rigid elastic links for the connection between pier and girder is defined. The loads applied in this stage are due the form travelers for the segments 1 at the first day of the stage, and the weight of the wet concrete for the segments 1 at the 4th day.
In Construction Stage 2, segments 1 are activated. No new boundary conditions are necessary for this stage. The loads applied in this stage are due the form travelers and the weight of the wet concrete for the segments 2, applied at the same time range specified in the previous stage, also the prestressing loads from the cantilever tendons for segments 1 are applied when the concrete has an age of 3 days. The loads due to the form travelers because the form travelers have been moved into position for the next segments, and the weight of the wet concrete for the segments 1 are deactivated because the segment has been already activated and the self-weight is considered. The duration of this construction stage is 7 …show more content…
The displacement shown in the figures are the total displacement, which is the result from the combination of the displacements in x, y and z direction using the Square Root of the Sum of the Squares procedure