Building Design FAQs

DESIGN OF POST-TENSIONED BUILDINGS
ADAPT SOFTWARE SYSTEM TRIAL
ABOUT ADAPT-PT
ABOUT ADAPT-RC
ABOUT ADAPT-Modeler
ABOUT ADAPT-Floor Pro
ABOUT ADAPT-ABI
ABOUT ADAPT FELT and PULT
DESIGN AIDS; PUBLICATIONS


DESIGN OF POST-TENSIONED BUILDINGS
Q - How should I treat an interior wall that is parallel to the design strip I am modeling for design?
A - ADAPT has a brief on the treatment of walls that are parallel to the analysis frame. E-mail ADAPT at support@adaptsoft.com and request that a copy be e-mailed to you. For walls that are normal to the frame being analyzed there will be no torsional member in the context of "Equivalent Frame." The torsional member modeling is valid if the tributary is larger than the width of the support.


ADAPT SOFTWARE SYSTEM TRIAL
Q - I want my colleagues to try out ADAPT programs. What is the best way?
A - If you are a user of ADAPT's Builder, PT, or RC software, simply give your colleagues a copy of your ADAPT program CD. Once loaded, the program works in its "Educational Mode" and allows your colleagues to try it out without having a Key.
Alternatively, interested design engineers can contact ADAPT directly for an educational copy of ADAPT's programs.


ABOUT ADAPT-PT
Q - If I have a load that repeats itself over more than one span, is there a shortcut for its input in ADAPT-PT?
A - Yes. Let us assume you have the same loading on spans 1 through 5. Go to the "Loading" dialog window and enter "1-5" under the "Span" column. This will repeat the load you enter for spans 1 through 5 the next time you refresh the screen. Refresh the screen by clicking the "Next" button.
Or, if you want the load to be on spans 1, 3 and 5, enter "1,3,5" in the "Span" column.

Q - Can ADAPT-PT calculate the long-term stress losses in prestressing tendons?
A - Yes, it can. ADAPT-PT can calculate the losses due to friction, seating loss, creep, shrinkage and relaxation in prestressing for both the bonded and unbonded post-tensioning systems. In the input data, you need to select the options of friction and long-term loss calculations.


ABOUT ADAPT-RC
Q - There is an old building that needs to be retrofitted. I have the structural drawings. How can I determine if the floors have the capacity for the new loading?
A - Simple! ADAPT-RC has an "Analysis/Review" feature that allows you to enter as input the reinforcement shown on the existing structural drawings, along with the new required loading. The program finds out the capacity of the floor and reports the available capacity and if and where it is exceeded for the new loading.


ABOUT ADAPT-Modeler
Q - Can I use a DWG file to create a structural model for analysis, or should I first convert the DWG into DXF?
A - You may use your DWG file. ADAPT-Modeler can import the latest and previous versions of DWG formats as well as DXFs.


ABOUT ADAPT-Floor Pro
Q - How does Floor Pro handle loading, load cases and load combinations?
A - The program organizes loading and its treatment through "loads," "load cases," and "load combinations." This is followed by the action you expect to be taken place on a load combination. The following is the explanation.The program organizes loading and its treatment through "loads," "load cases," and "load combinations." This is followed by the action you expect to be taken place on a load combination. The following is the explanation.
  • A "load case" is made up of a group of individual loads that together have a common cause. Common load cases are: dead load, live load, prestressing, superimposed dead load, and more. Specific load cases vary from project to project. For example: "wind_from_east," "fire_truck" can be user defined load cases for a particular floor system.

    Each load case consists of one or more loads. Loads can be concentrated, line loads, area (patch) loads, moments and more.

  • A "load combination" is when a solution for the simultaneous action of one or more load cases is sought. Each load case can be considered with its own multiplying factor. For example: A load combination called "service" can be defined as given below.

    Service: 1.0 * dead + 1.0 * live + 1.0 * prestressing

    In the above, dead, live, and prestressing are each a load case. You first define the load cases. Then you combine them with a multiplying factor and give them a name. In this case the name selected by you is "Service."
Q - What are default load cases?
A - The program generates several load cases on its own. These are referred to as "default" load cases. You need not use these load cases, if they do not serve your purpose. The default load cases are:
  • Selfweight - Selfweight is calculated automatically by the program from the volume geometry of each structural component and the unit weight assigned by you to that component. If you do not intend to use the selfweight in your analysis, simply do not include the "selfweight" load case in your load combinations. Or, specify zero unit weight for the components, whose selfweight you do not account for.
Q - In the project I am working on, the tendons swerve in the horizontal plane over the columns that are not lined up. Does the program account for the curvature of tendons in the horizontal direction also?
A - Yes. Both the profiles in the vertical and horizontal planes are used by the program to calculate the stress losses in tendons and to arrive at the tendon force necessary for the analysis and design.

Q - Does ADAPT-FLOOR Pro give the length and location of the required reinforcement?
A - Yes. At conclusion of design, the program lists and/or displays the required reinforcement by its location, length, size and the number of bars.


ABOUT ADAPT-ABI
Q - How can I get the hyperstatic (secondary) moments that I need to add to my factored dead and live loads in order to arrive at the "design moments"?
A - You do not need to do much. Once you specify the loading condition "Prestressing" in ABI-Gen module, the program automatically calculates the hyperstatic moments and shear and saves it under the name "PH." All you need to do is add the label "PH" to your strength limit load combinations.


ABOUT ADAPT FELT and PULT
Q - I have a tendon with a profile in three dimensions. Which tendon profile do I need to select when I want to enter it in FELT?
A - Use tendon profile type 4. Consider the tendon made up of a number of segments. For each segment you need to enter the length and the angle.


DESIGN AIDS; PUBLICATIONS
Q - Where can I find more information to help me decide between slab one-way and two-way in my designs?
A - There is a PTI Technical Note that covers this topic in detail. It can be obtained from ADAPT. Click here (PDF:). Its title is: "One-Way and Two-Way Post-Tensioned Floor Systems," PTI Technical Note #3, October, 1993, Post-Tensioning Institute, Phoenix, AZ, 10 pp.