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All list boxes enable multiple selection according to the Microsoft Windows standards (by using the CTRL or SHIFT keys, see the Microsoft Windows Manual for details). Note that the size of the resulting TXT file may be very large (for biaxial runs). File/Export now saves the failure surface data points (the points used in plotting the interaction diagrams and contour plots). In the Control Points or Axial Loads mode, the neutral axis depth is printed in the last table of the results file.

The strength reduction factor may also be modified. This command now enables the user to change the load case factors used to compute Beta(d). The Unbraced Factors command is changed to Factors (under Slenderness). Any user-input bars are saved with the input data file. This command allows the user to customize the reinforcing bars that the program uses. A new command, Options/Rebar Database, is added. These factors are now input using the Slenderness/Factors command (see 3 below).

Also, the Dead and Live load factors used to compute Beta(d) for slender columns are now independent of the defined load combinations. Up to 8 load combinations may be defined and the load factors are independent of each other from combination to combination. Printing problems occured when printing results or screen if the printer is a post script printer. For the CSA code, uniaxial slender column runs, the Cm coefficient was computed based on the minimum moment eccentricity if M(min) was larger than the applied moment. The program is now correct and equations 5-33 and 5-35 in the manual should be changed to M(c) = Delta(b)*M(min). For the CSA code, when computing the magnified moment, the total moment M(2b)+M(2s), for braced columns, or M(2b)+Delta(s)*M(2s), for unbraced columns, should have been compared to the moment due to minimum eccentricity, M(min). For uniaxial slender column runs under the CSA code, if no moments are input at the top and bottom of the column, the ratio M1/M2 used to compute Cm was taken as 0.6 instead of 1.0 as indicated in the maunal. All list boxes (Factored Loads, Service Loads, Axial Loads, and Irregular Reinforcement) caused a crash if the maximum number of items in a list box was entered and an attempt to delete an item was made. If more than 15 factored loads are input using the Loads/Factored command, the computed capacities table lists garbled results after the 15th load and printing the results file causes a crash. A crash occured if a user attempts to input a load value that has more than 5 digits. For biaxial runs, the interpolation method to obtain the interaction diagrams yielded incorrect results for columns with very large (or very small) width/depth ratio. Very small non-zero moment causes 'Cannot Converge.' error. Divide by zero error when trying to design a section that cannot be designed because of bar spacing restrictions. Trying to start IRRCOL after executing a DOS program or DOS session in Windows gave a 'Cannot Transfer Data to IRRCOL' message and the user had to restart Windows to remedy the situation.

PCACOL V2.30: = The following bugs have been fixed: -1.

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