Determining the features of oscillations in prestressed pipelines

This paper considers the structural solution for a main above-ground pipeline with pre-stressed winding, which makes it possible to improve efficiency of operation and reduce material consumption. The results from studying experimentally features in prestressed pipelines under static operating loads are given. It is shown that radial movements wall constrained by strained prevents its deformation. was revealed increasing tension force winding wire reduces circular stresses 1.3...1.6 times increases meridional ones 1.2...1.4 times. experimental study into models free vertical horizontal oscillations has established dependence frequency characteristics on conditions pre-stress parameters. found envelope amplitude oscillogram attenuated takes shape an exponent, indicates damping effect pre-stress. Analysis change dynamic depending frequencies increase 1.5÷1.6 while oscillation decrement decreases 1.2÷1.25 reports influence parameters stressed-strained state model forced oscillations. diagrams deformations smoother compared similar conventional tested at same have made quantify influences, taking consideration conditions.