Construction deflection

Question:

When working with construction steps and activating one span (deformed) after a previous one has been active, there is a jump in the deflections even with "Initial Displacement for C.S." is active. How to avoid the jumps in deflection values in the same girder?

Answer:

Hello,

The jump in deflections in same girder can be avoided by viewing the results by checking on "stage/step real displacements" option as described below with help of an example.

I modeled the 2 span girder activated in 2 construction stages as shown below.

Construction stage analysis was performed where only dead load due to self weight was applied.

After analyzing the model, displacement contour due self-weight for construction stage 2 is observed . The jump in result is observed.

But now, when the results for displacement contour are viewed by checking on the Stage/Step real Disp. option, the jump disappears as shown below

construction stage analysis control initial tangent displacement

Creation date: 6/4/2021 3:28 PM Updated: 6/4/2021 3:28 PM

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