Seismic response analysis of buried oil and gas pipeline under bidirectional multi-point excitation

Abstract

Aiming at the seismic response of buried oil and gas pipeline under bidirectional multi-point excitation, the shaking table test of buried oil and gas pipeline under bidirectional multi-point seismic excitation was carried out by using a new layered shear continuum model of soil box and pipeline model. The seismic response law of acceleration and strain of buried oil and gas pipeline under bidirectional multi-point excitation, as well as the response law of soil acceleration and displacement around the pipeline, are clarified through experiments. The results show that: compared with the bidirectional consistent excitation, the curve of soil acceleration amplification coefficient under bidirectional multi-point excitation has a wider fluctuation range, and the soil displacement changes more significantly. The peak acceleration of the pipeline increases with the increase of loading grade and presents a decreasing amplitude and multi-peak phenomenon. The variation law of pipeline strain under bidirectional consistent excitation and bidirectional multi-point excitation is basically the same, showing a trend of large strain in the middle of the pipeline and small strain on both sides, but the strain response of the pipeline under bidirectional multi-point excitation is more prominent. Therefore, the influence of bidirectional multipoint excitation should be considered in seismic response analysis of buried oil and gas pipelines.