C#: Decode and Encode the data

See also

C# - Examples

• C#: Connect to CDB

• C#: Read the node properties

• C#: Single Span Girder

Problem Description

In this example the decoding of the CDB data (KFIX value from @20/0 Nodes) is examined. E.g. KFIX value for node 1 (KFIX=112) and for node 11 (KFIX=113). What does it mean?

In CDBASE.CHM you can find the description on how to encode/decode the KFIX value (degree of freedoms for nodes). A value 112 doesn’t mean nothing to us when we do not know what it means.

Example: CDBASE.CHM description

@2# KFIX [int] degree of freedoms old definition:

#0     all fixed
&1     displacement uX
&2     displacement uY
&4     displacement uZ
&8     rotation PHIX
&16    rotation PHIY
&32    rotation PHIZ
&64    twisting dPHIx/dx
&128   split continuous beams flag
&256   ux-uy-uz may be suppressed
&512   phix-phiz may be suppressed
&1024  warping may be suppressed

For KFIX=112

112 - 1024 = -912 < 0	warping my be suppressed	FALSE
112-512 = -400 < 0	phix-phiz may be suppressed	FALSE
112-256 = -144 < 0	ux-uy-uz may be suppressed	FALSE
112-128 = -16 < 0	split continuous beams flag	FALSE
112-64 = 48 > 0	twisting dPHIx/dx	TRUE
48-32 = 16 > 0	rotation PHIZ	TRUE
16-16 = 0 = 0	rotation PHIY	TRUE

twisting dPHIx/dx	= PX + PY + PZ + MX + MY + MZ
rotation PHIZ	= -MZ
rotation PHIY	= -MY
Result	= PX + PY + PZ + MX = PPMX

For KFIX=113

113 - 1024 = -912 < 0	warping my be suppressed	FALSE
113-512 = -399 < 0	phix-phiz may be suppressed	FALSE
113-256 = -143 < 0	ux-uy-uz may be suppressed	FALSE
113-128 = -15 < 0	split continuous beams flag	FALSE
113-64 = 49 > 0	twisting dPHIx/dx	TRUE
49-32 = 17	rotation PHIZ	TRUE
17-16 = 1 > 0	rotation PHIY	TRUE
1-8 = -7 < 0	rotation PHIX	FALSE
1-4 = -7 < 0	displacement uZ	FALSE
1-2 = -7 < 0	displacement uY	FALSE
1-1 = 0 = 0	displacement uX	TRUE

twisting dPHIx/dx	= PX + PY + PZ + MX + MY + MZ
rotation PHIZ	= -MZ
rotation PHIY	= -MY
displacement uX	= -PX
Result	= PY + PZ + MX = XPMX

Problem Solution

A code example for C#:

C# - decode nodes KFIX value

static void Main(string[] args)
{
   float x = 0;
   int result = 112;
   string value = "PXPYPZMXMYMZ";

   x = (64 & result);
   if (x > 0)
   {
     value = "PXPYPZMXMYMZ";
   }

   x = (32 & result);
   if (x > 0)
   {
      value = value.Replace("MZ", null);
   }

   x = (16 & result);
   if (x > 0)
   {
      value = value.Replace("MY", null);
   }

   x = (8 & result);
   if (x > 0)
   {
      value = value.Replace("MX", null);
   }

   x = (4 & result);
   if (x > 0)
   {
      value = value.Replace("PZ", null);
   }

   x = (2 & result);
   if (x > 0)
   {
      value = value.Replace("PY", null);
   }

   x = (1 & result);
   if (x > 0)
   {
      value = value.Replace("PX", null);
   }

   // Replace the text
   value = value.Replace("PXPYPZ", "PP");
   value = value.Replace("MXMYMZ", "MM");
   value = value.Replace("PYPZ", "XP");
   value = value.Replace("PXPZ", "YP");
   value = value.Replace("PXPY", "ZP");
   value = value.Replace("MYMZ", "XM");
   value = value.Replace("MXMZ", "YM");
   value = value.Replace("MXMY", "ZM");
   value = value.Replace("PPMM", "F");

   Console.WriteLine("Value:" + value);
   Console.ReadKey();
}