Taking A as the research object, a coordinate system with horizontal to right as the X axis and vertical to down as the Y axis is established for force analysis.

Fx=Facsin30 -Fabsin45 =0，

Fy=F-Faccos30 -Fabcos45 =0，

Solution: F=( 1+v3)Fac/2.

[fac]=[s]*s= 120* 10^6*π*(0.025/2)^2=58775(n]，

Therefore, [f] = (1+v3) [fac]/2 = 80288.1(n).