Important Considerations for Reinforced Concrete Building Modeling with StatiCAD
Reinforced concrete analysis and design features were added to the program with StatiCAD Ultimate version 6.2.0.0.
Only the analysis and design of new reinforced concrete buildings can be performed.
Start your project by setting up the floor settings first.
In the Code Selection tab of the Project General Settings window, select "Reinforced Concrete Building" as the building type and select the ductility level you want to design for.
In the TBDY2018 tab, enter the SS and S1 values for DD-2 and DD-3 earthquake levels. The SS and S1 values entered for DD-2 are used for earthquake force calculations, while the values entered for DD-3 are used in calculating the coefficient for limiting relative story drift.
Enter the building type code (e.g., A11, A12) in the relevant box and press the "Apply Values" button. Building type codes affect code calculations related to the building type during analysis.
R and D coefficients and allowed BYS values are taken from the table when the "Apply Values" button is pressed. If needed, when values are changed, the given values are used.
Soil bearing capacity stress, local soil class, and soil subgrade reaction coefficient values are obtained from the geotechnical report (soil investigation report).
The number of floors excluding basements is used in soft story calculations.
Address/Latitude/Longitude information is printed in the report for informational purposes only.
For new building calculations, the 5% additional eccentricity option should be selected.
In the Method 1 tab, you can select equivalent earthquake load or modal analysis for the Earthquake Load Calculation option. With finite elements modal analysis, you can select diaphragm or non-diaphragm analysis type.
If you select the equivalent earthquake load method, you can calculate the building's dominant vibration period using modal analysis (more precise method) or empirical formulas given in Article 4.7.3.4.
When dynamic analysis is selected and the gammaE value is set to 0.8, if A1 irregularity exists after analysis, a message will appear on the project error checks page (3rd report page) and in the A1 Torsional Irregularity report indicating that the gammaE value should be taken as 0.9. In such cases, setting gammaE to 0.9 and repeating the analysis resolves the issue.
Within the scope of TBDY2018, the building's dominant vibration period can be calculated based on TPA under the following conditions.
Selecting shell finite elements as the slab load transfer option is beneficial for more realistic beam torsion reinforcement calculations and more precise slab vertical load transfer, but it increases analysis time.
In the Mesh tab, you can adjust shell element mesh parameters.
In the Material tab, you can set the material types to be assigned to elements. For different material types, you can assign materials from column, beam, and shear wall properties.
If your building has a half-basement, the half-basement building project option should be selected in the other options tab.
If foundation modeling has been done, the "Finite Elements - Structure-Foundation Combined Analysis" option should be selected for reinforced concrete buildings. If no foundation modeling has been done, the "Superstructure Only" option should be selected so that columns and shear walls are assumed to be fixed at the bottom.