Analyze the frame as shown in fig. Draw free body diagram of each member and construct AFD, SFD and BMD,

(1)Support $rx^n$ calculation:

$\sum M_A=0$

$10\times 2+15\times 4\frac{4}{2}-V_D\times 4=0$

$V_D=35kN$

$\sum F_y=0(\uparrow +ve)$

$V_A-(15\times 4)+35=0$

$V_A=25kN$

$\sum F_x=0(\rightarrow +ve)$

$-H_A-10=0$

$H_A=-10kN(\leftarrow)$

(2)Consider part AB

(3) Now consider part BC

(4) Now consider part 'CD'