the question states "if Psi top is 1.5 and the bottom joint is a firm (fixed) joint what is k? if the column is braced" what I don't know is if the joint is fixed should I take Psi as 0 or infinity? this is a diagram of the column
You should take $\psi=0$, typically for fixed braced concrete column, design aids set the bottom as zero flexibility.
Common sense then tells us that if we have a column with top and bottom fixed; it has 2 inflection points at 1/4 length of the column from the bottom and top. Hence we get K= 1/2, which is as shown on this chart.