Determine approximately the support reactions at joints A and B of the portal frame shown. Assume: a) The supports are pinned; b) The supports are fixed. Ans: a)
A_(y)=18kN;A_(x)=6kN;B_(y)=18kN;B_(x)=6kN; b)
A_(2)=6kNiA_(2)=9kN;M_(4)=18kN=B_(4)=6kN,B_(4)=9kN;M_(9)=18kNm