This section lays out a general process that you can follow to create a model in ETABS. It is not necessary, or expected, that you exactly follow the process here. The intent of this section is to help keep you headed in the right direction as you create your model and run the analysis. Following is a process you might use to create a typical ETABS model: 1. Set the current units to those that you will want to use most often in your model. See Chapter 20 for more information. 2. Start your model by clicking the File menu > New Model command and choose one of the file initialization methods. See the subsection titled "Initialization of a New Model" in Chapter 8 for more information. 3. Set up your grid lines. See the subsection titled "Defining a Grid System" in Chapter 8 for more information. 4. Define your story levels. See the subsection titled "Defining Story Data" in Chapter 8 for more information. 5. If desired add structural objects from one of the built-in ETABS templates. See the subsection titled "Adding Structural Objects from Template" in Chapter 8 for more information. In general we recommend that you start your model by adding objects from a template whenever possible. 6. Use the Options menu > Preferences command to modify any of the default preferences if desired. See the section titled "Preferences" in Chapter 18 for more information 7. Use the Define menu to define frame section properties, wall, slab and deck section properties and link properties as required. See Chapter 11 for more information. 8. Use the Define menu > Static Load Cases command to define your static load cases. See the section titled "Static Load Cases" in Chapter 11 for more information. 9. If you are using mass in your model then use the Define menu > Mass Source command to specify the source of mass in your model. See the section titled "Mass Source" in Chapter 11 for more information. 10. Use the commands available on the Draw menu to draw additional area, line and point objects as needed. See Chapter 12 for documentation of the drawing features in ETABS. When you draw the objects we recommend that you assign structural properties to them as you draw them using the floating properties of object box. The objects you draw may be assigned structural properties, loads or masses. Also the line objects might be used as guidelines for snapping (see Chapter 12), guidelines for extending or trimming other lines (see Chapter 8), or mesh lines for manual meshing (see Chapter 31). Note that mass is required if you are doing a modal analysis to determine mode shapes (Chapter 33). It is also required for the non- iterative method of considering P-Delta (Chapter 33). It is also required to convert static nonlinear force-deformation results into the capacity spectrum ADRS format. 11. Use the Edit menu commands to modify and in some cases tweak the geometry of your model as needed. See Chapter 9 for documentation of the various Edit menu features. 12. Use the Assign menu commands to revise properties in your template model, if necessary, and to make additional assignments to template members as well as to any other members you might have drawn. See Chapter 14 for documentation of the various Assign menu features. The types of assignments you make include section properties, loads, masses, moment releases, partial fixity, etc. To make an assignment to an object you first select the object then you click the appropriate Assign menu command. 13. Use the Display menu > Show Loads command and the Display menu > Set Input Table Mode command to review your input. Both of these commands are documented in Chapter 16. Another way to review your input is to right click on any object. This brings up a dialog box where you can review all assignments to the object. See Chapter 23, 24 and 25 for documentation of this feature for area, line and point objects, respectively. You can also use the View menu > Set Building View Options command, or the Set Building View Options button, , on the main top toolbar to toggle on the display of various input items. Some examples are section properties, member end releases, nonlinear hinges, diaphragm extent, etc. 14. If desired, use the File menu > Print Tables > Input command to print input data to a file or to the printer. See the section titled "Printing from ETABS" in Chapter 8 and see Chapter 41 for more information. Alternatively you can use the File menu > Export > Save Input/Output as Access Database File command to save the input data in a database file that can be reviewed, modified and printed using Microsoft Access. 15. Use the Analyze menu > Set Analysis Options to specify various analysis parameters such as the building degrees of freedom. See the section titled "Analysis Options" in Chapter 15 for more information. 16. If your model has floors, walls or ramps that require manual meshing then use the manual meshing options available through the Define menu > Mesh Areas command to mesh these objects. See Chapter 31 for discussion of the manual meshing features. Note that ETABS can automatically mesh floors that have membrane properties only. All other floors and all walls and ramps must be manually meshed by you. We recommend that you wait until just before you are ready to run the analysis to perform this manual meshing. 17. Use the Analyze menu > Run Analysis command to run your analysis. See the section titled "Run Analysis" in Chapter 15 for more information. When the analysis is complete scroll through the text in the Analysis Window to check for any warnings or errors that might invalidate your analysis. 18. Use the display features available on the Display menu to display analysis results on your model or on the screen in a tabular format. See Chapter 16 for documentation of the Display menu features. Note that output conventions for various objects and elements are discussed in Chapters 34 through 39. 19. If desired, use the File menu > Print Tables > Analysis Output command to print output to a file or to the printer. See the section titled "Printing from ETABS" in Chapter 8 and see Chapter 41 for more information. Alternatively you can use the File menu > Export > Save Input/Output as Access Database File command to save the analysis output data in a database file that can be reviewed, modified and printed using Microsoft Access. 20. If desired, use the features available on the Design menu to run your building through one or more of the ETABS design postprocessors. 21. After you have run a design save your model before exiting ETABS. Otherwise your design is not saved. Steel Frame Design Procedure Following is a typical steel frame design process that might occur for a new building. Note that the sequence of steps you may take in any particular design may vary from this but the basic process will probably be essentially the same. 1. Use the Options menu > Preferences > Steel Frame Design command to choose the steel frame design code and to review other steel frame design preferences and revise them if necessary. Note that there are default values provided for all steel frame design preferences so it is not actually necessary for you to define any preferences unless you want to change some of the default preference values. 2. Create the building model. See the section titled "Modeling Process" in Chapter 6 for more information. 3. Run the building analysis using the Analyze menu > Run Analysis command. 4. Assign steel frame overwrites, if needed, using the Design menu > Steel Frame Design > View/Revise Overwrites command. Note that you must select frame elements first before using this command. Also note that there are default values provided for all steel frame design overwrites so it is not actually necessary for you to define any overwrites unless you want to change some of the default overwrite values. 5. Designate design groups, if desired, using the Design menu > Steel Frame Design > Select Design Group command. Note that you must have already created some groups by selecting objects and clicking the Assign menu > Group Names command. 6. If you want to use any design load combinations other than the default ones created by ETABS for your steel frame design then click the Design menu > Steel Frame Design > Select Design Combo command. Note that you must have already created your own design combos by clicking the Define menu > Load Combinations command. 7. Designate lateral displacement targets for various load cases using the Design menu > Steel Frame Design > Set Lateral Displacement Targets command. 8. Click the Design menu > Steel Frame Design > Start Design/Check of Structure command to run the steel frame design. 9. Review the steel frame design results. To do this you might do one of the following: ETAB tieng Anh
