APPENDIX C 

 OPERATION AND RULES OF THE COMPUTER PROGRAM 



INPUT FORMS 



All data are to be collected and put on an input form from which it will be punched into 

 cards for input to the computer. Table 2 is an example of one such input form and includes 

 data for the sample problem treated on page 6. Only one "identification" (see Tables la and 

 b) is used per section. This first card is used to identify the deck of cards which is punched 

 and will also appear as a heading on the output (Table 3). A second card will contain the 

 number of cards which follow in each of the three categories (nodes, plates, and masses); 

 operating instructions; and some constants. The data cards follow these first two cards. 

 All of the node cards must come next, and there must be more than one such card. Next come 

 all of the plate cards; there must be at least one of these. The mass cards, if any, follow 

 next. The cards must be stacked in the order indicated, and there must be exactly as many 

 of each type as indicated on the second card; however, the cards within any of the three 

 categories may be in any order. If more than one section is to be analyzed, the cards for 

 each section may be stacked together. Each section must begin with its identifier. After 

 the calculation for one section is completed, the computer will automatically begin the next 

 section. 



OUTPUT FORMS 



The output data will be identified by headings (see Table 3). The units are consistent, 

 the length always being the same as Y and Z. (If areas are given in square inches and Y in 

 feet, SCALE = 12.0, the output will all be in feet units.) Mass output includes mass, location 

 of the center of gravity, and the moments of inertia about the center of gravity. Areal output 

 includes the total tension area (not used in beam analysis unless there is an axial load), 

 location of the elastic (neutral) axis, and bending flexibilities. If I is the moment of inertia 

 about an axis parallel to the Z-axis through the elastic axis (I = SAY^), etc., and 

 A = I I - I^ , then* 



yy zz yz' 



YY Flexibility = I ../A, (=1/1 for symmetric section) 

 YZ Flexibility =1 /A , (= for symmetric section) 

 ZZ Flexibility = I /A, (=1/1 for symmetric section) 



*See page 53 and Sheet 1 of Table 4. 



