Dapped end with an opening

By following this tutorial step-by-step, you will learn how to design and code-check a dapped end with an opening in IDEA StatiCa Detail.

1 New project

Start by launching IDEA StatiCa and select the application Detail. Create a new project by clicking New. The Wizard window is opened and you can start with a selection of proper concrete grade and cover. Then continue with Members 1D topology.

Dapped end with the opening - New project
Dapped end with the opening - New project

In Members 1D templates, select Dapped end, one css.

Dapped end with the opening - New project

After this, a predefined template will load geometry and basic reinforcement into our model.

2 Geometry

Start with the modification of geometry. Three items have been loaded by the template: Member M1, dapped end DE1 and point support PS1. We click on DE1 and choose right-sided haunch with 0.85 m width.

Dapped end with the opening - Geometry

Continue with the addition of opening. To add it, click on the plus button and in Model pick Opening.

Dapped end with the opening - Geometry

Change the shape of the opening to Circular and diameter to 0.5 m. To place the opening to the desired position, use the master and insert points relationship. The master component will be M1 and masterpoint no. 8, insert the point of opening also no. 8 and the distance between these points in X direction will be 1.5 m.

Dapped end with the opening - Geometry

IDEA StatiCa Detail warns you by error messages and by red highlighted items, that the length of the detail is insufficient. The trimmed end of detail should be at a distance of at least 1.5*h from the last source of discontinuity. In this case, the governing source is opening and the sufficient length of the member is 4.6 m. All warnings should disappear after the elongation of the member M1.

Dapped end with the opening - Geometry

3 Loads

Dapped end with the opening - Loads

Two load cases and three nonlinear combinations were automatically added by the software. You need two load cases to distinguish between permanent and variable loads and three combinations to cover one ULS and two SLS combinations (Characteristic and Quasi-permanent) for all checks.

Modify load case LC1 for permanent effects. Apply reaction as a shear force Vz from the right position. You can see the change in the internal forces diagram.

Dapped end with the opening - Loads

Switch to LC2 load case by combo box and repeat the steps with different values.

Dapped end with the opening - Loads

As you want to decrease the values of internal forces at the trimmed end, change the line load value.

Dapped end with the opening - Loads

Last step in loads definition will be the change of the partial factor for quasi-permanent combination CO2. You can access the partial factor dialog from any defined combination by pen icon next to the combination rule. Change the LC2 partial factor.

Dapped end with the opening - Loads

4 Reinforcement

To reinforce this particular model, start with predefined template in IDEA StatiCa Detail and modify it. Before doing that, you would like to see, how to reinforce it based on design tools results.

Dapped end with the opening - Reinforcement

Click on the Linear analysis icon to run it. To see the most compressed fields better, you can apply a filter for compression -1.4 MPa on the right side of the ribbon. These are the results you can see:

Dapped end with the opening - Reinforcement

Red areas represent compression and blue lines tension. If you want to reinforce the detail based on these results you can switch to Input/Edit. Results will remain in the background, but to show how to work with reinforcement, switch them off for the purpose of the tutorial.

Dapped end with the opening - Reinforcement

First item ST1 is used for stirrups modeling. Modify the diameter of the stirrups to 10 mm and change the distances between stirrups as 50 2500/17 a200. As you can see, you can combine several definitions of distances. This means, that first stirrup is positioned 50 mm from edge, then we fill 2.5 m by division of 17 and fill the rest per 200 mm distance.

Dapped end with the opening - Reinforcement

Change reinforcement item GB1 properties.

Dapped end with the opening - Reinforcement

Replace reinforcement item IB1 by another group of bars item – delete IB1 first.

Dapped end with the opening - Reinforcement

To add a new reinforcement item, use plus button and select the Group of bars in Model section.

Dapped end with the opening - Reinforcement

Change the definition of GB4 bar shape to On more edges and then adjust the diameter. Then fill in the right order of edges to place rebar into the desired position.

Dapped end with the opening - Reinforcement

You added the opening to the original template and thus you need to add reinforcement around it. Again, press plus button and in Cages we select Around opening.

Dapped end with the opening - Reinforcement

Modify its properties according to the screenshot.

Dapped end with the opening - Reinforcement

When you switch in the navigator to Check, this is how your final reinforcement should look like:

Dapped end with the opening - Reinforcement

5 Calculation and Check

Start the analysis by clicking Check in the ribbon. The analysis model is automatically generated, the calculations are performed and you can see the summary of checks displayed together with the values of check results.

Dapped end with the opening - Check

To go through detailed checks of each component, start with the Strength tab. This will show concrete checks such as utilization in stress, principal stresses, strains and a map of reduction factor kc which can be switched on the ribbon.

Dapped end with the opening - Check

For detailed results of reinforcement, you need to click on a row Reinforcement. This will change the ribbon icons and will unroll the table for results. We can display results for strains and stresses in each bar and their utilization.

Dapped end with the opening - Check

All results can be displayed in the same way. Let´s show the difference in ribbon for SLS checks crack-width and deflection. Besides the icons to switch between the results, there are settings in the ribbon to set the limit value or display of results from short/long-term models.

Dapped end with the opening - Check

6 Report

At last, go to the Report Preview/Print. IDEA StatiCa offers a fully customizable report to print out or save in an editable format.

Dapped end with the opening - Report
Dapped end with the opening - Report

You have designed, optimized and code-checked a dapped end with an opening according to Eurocode.

Sample files

Dapped end with the opening

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