more info:

i didn`t have enough space for developing the loop for line with 130 feet lenght,so i fixed the end of pipe,for unwanted displacment , about 30-40 cm displacement in the end of line(some meters before the end,it will be weld to support),line has 200 meter length(130 feet)

if i anchore the end of pipe it makes force, so some meter before the end of pipe i fixed it(with lim restraint)
now displacements are not exist but the axial force is appeared,
now i have to now the allowable axial force!