FAQ’s RC

In the rebar output tables in Section 10 of the report, what is the difference in rebar lengths for “Provided Rebar” and “Rebar Disposition?”
ADAPT-RC reports the total bar lengths and bar starting position in the “Provided Rebar” report regardless of span.  In the “Rebar Disposition” report, the program will break the rebar reported per span.  The starting point and lengths are for each span. 

My magnitude of LL and SDL are the same, why is my LL deflection so much greater than SDL?
ADAPT-RC 2010 (and v5) does not solve deflections independently for each load case (other than SW) and superimpose them.  The program checks deflections in stages and the results are reported in this way.  For each stage, the program will check for cracking, if the actual moment, Ma, is greater than the cracking moment, Mcr, the program will reduce Ig to Ieff for use in calculating the deflection.  The stages are as follows: 

(1)     SW

(2)    SW+SDL

(3)    SW+SDL+LL

(4)    SW+SDL+LL+XL

When the program calculates individual case deflections (e.g. LL) it will take the solution from (3) and subtract from (2).  This gives us a true representation of the state of stress and if the slab has cracked prior to the LL application.   

 What Live Load skip patterns does ADAPT-PT use?

Does ADAPT-PT check ACI 318-08 provisions 11.5.5.3?
Yes, the program checks all applicable code provisions relative to one-way shear for prestressed and non-prestressed systems.  The program will report **** when the maximum factored shear resistance, Vn, is exceeded.  The following technical note outlines the procedure for shear design in ADAPT-PT and Builder.

Does ADAPT-RC 2010 reduce the modulus of ruture by 0.5 for slabs and beams when using the 2004 Canadian code? 
ADAPT-RC 2010 was modified to reduce the modulus of rupture, fr, by 0.5 for two-way slabs.  This change is noted in the “Log_RC.txt” file in C:/Program Files/ADAPT/RC 2010.  In a recent revision to the Canadian code  (CSA A23.3-04/R2010) the modulus for all systems are to be reduced by 0.5.  This change will be implemented in a future update to RC 2010. 

How do you save the company log and information for ALL ADAPT-RC files?   
To overwrite the default logo and company header go to the following program files and you can make the changes.  These are:

 C:/Program Files/ADAPT/ADAPT-RC 2010/report/company_footer.exe
C:/Program Files/ADAPT/ADAPT-RC 2010/report/adapt.bmp

Note that your company logo must be saved as a .bmp file and called “adapt.bmp.”  You will need to remove the existing file and replaced with your logo file.

How does ADAPT-RC determine unbalanced moments in Report Section 16?   
The unbalanced moments reported in block 16 are the moments required to maintain equilibrium or balance a joint.  The unbalanced portion is then tranferred to columns.  If a slab or beam includes the skipping of Live Load, the program will report the Max/Min Live Load in Section 5 of the report.  The unbalanced moments in Section 16 are calculated from these Max/Min values.  Note that another skip pattern and those joint moments associated with a specific pattern may results in a higher unbalanced moment, which may not be reflected in Section 16.  This is currently under review for improvement. 

Why don’t my unbalanced moments at a joint equal the column moments for the same load case? 
If a user opts to skip the live load, the program will determine the worst-case unbalanced moment that is distributed to columns from the controlling skip pattern.  If the LL application includes some load factor like 0.75, the unbalanced column moments are ratioed such that they reflect a load factor of 1.0.

Does RC calculated deflections based on cracked analysis?
Yes, RC does check whether or not a design section is cracked and bases the deflection anaylsis on a reduced moment of inertia, Ieff, where applicable. The lastest ADAPT-RC Manual contains a thorough review on Pages 138-146.

Why are the options for ‘I’ section and extended ‘T’ section grayed out?
If you are trying to use either of these sections for the design of a flanged beam, make sure you turn off the consideration for effective flange. This wil allow either of these sections to be active.