INVESTIGATION OF CONDITIONS OF SERVICE OF UNDERGROUND PIPE LINES DURING EARTHQUAKES
AIR FORCE SYSTEMS COMMAND WRIGHT-PATTERSON AFB OH FOREIGN TECHNOLOGY DIVISION
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From the static theory of the earthquake resistance of constructions, it is assumed that a pipe line and the ground surrounding it are deformed identically. The relative dislocations are not considered. Formulas were obtained for determining stresses on a pipe line during the propagation of longitudinal seismic wave in a direction along the axis of the pipe line. The creep of particles of ground from the pipe line were considered by means of a certain coefficient, which for an evaluation of the magnitude of stresses is assumed to be equal to unity. The creeping of a pipe line from particles of ground was considered depending upon volume of ground, participating in the joint movement of the cited medium ground-pipe line. On the basis of several examples a conclusion was reached about large reserve in strength of ordinary steel pipe lines during earthquakes of average and high intensities. In this work on the basis of dynamic theory of earthquake resistance of a hydroelastic system a dynamic theory of earthquake resistancy of underground pipe lines is proposed.
- Structural Engineering and Building Technology