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I can not have a right calculation results though I tried to resolve this several times.

When I am using the matrix format, I get the wrong results.
In case that I am using the simple format x=20ft, I get the right result.

Please help me out.

Since x is a matrix and you are using it with other variables, you have to use vectorize.
You can either write it as a function or click to its button on toolbar > matrices.

Regards

Wrote

I can not have a right calculation results though I tried to resolve this several times.

You can make each demand algo style
1rst demand exemplified.
The algo style will support in-situ infinite command line.
... in-situ infinite command line wrt [u,v,x]
A damned elegant Pro. style project !

Here is your file fixed.

2 psc beam bridge(US unit)-Dead Load_fixed.sm (188 KiB) downloaded 30 time(s).