Abstract
The buried oil and gas pipeline is a linear structure with infinite length. In the shaking table test of its seismic response, it is necessary to input the spatially related multipoint seismic wave considering the propagation characteristics of ground motion. The multipoint seismic excitation shaking table tests and loading scheme of buried oil and gas pipelines are designed and formulated. The synthesis method of spatial correlation multipoint seismic wave for the buried oil and gas pipeline test is proposed in this study. The values of relevant parameters are analyzed, and corresponding program is compiled by MATLAB. The results show that the developed multipoint excitation shaking table seismic wave input scheme is reasonable. At the same time, the synthesized multipoint seismic wave based on the actual seismic record and artificial random simulation seismic wave can meet the test requirements, which suggests the testing effect is good.
Highlights
Buried oil and gas pipeline is called lifeline project of oil and gas field
It is an effective method to analyze the seismic response of long linear structure by using a multipoint seismic excitation test with a multiseismic simulation shaking table array
Han et al [1] carried out a shaking table test of buried pipeline under multipoint nonuniform excitation, but only the influence of traveling effect during the ground motion propagation was considered in seismic wave input, and the time delay of each shaking table was 1 s
Summary
Buried oil and gas pipeline is called lifeline project of oil and gas field. Investigation on serious earthquake disasters shows that is the buried pipeline directly damaged in the earthquake, and it can produce seriously secondary disasters such as fire and explosion and environmental pollution. e buried oil and gas pipeline is an infinite structure. Han et al [1] carried out a shaking table test of buried pipeline under multipoint nonuniform excitation, but only the influence of traveling effect during the ground motion propagation was considered in seismic wave input, and the time delay of each shaking table was 1 s. EL-Centro wave was selected as the original seismic wave to obtain the cross power spectrum and the spectral representation method was used to generate the time history of multipoint stable ground motion, which was multiplied by the envelope function to form a nonstationary artificial ground motion random process from which two related seismic waves were synthesized, to be used as the input wave of each shaking table. E reciprocal power spectrum model is applied and the coherence between two points is used, and corrections are made in the original seismic waves based on the coherent amplitude and coherent phase angle to obtain the multipoint seismic wave time course at two different locations considering spatial correlation. Where ρ(ω, dij) is from (9), the hysteresis coherence function, and the coherence function model used in this paper is the Harichandran and Vanmareke model [12]:
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