Aiming at the aseismic protection of shallow buried petroleum pipelines crossing slopes in mountainous areas, a new type of prefabricated frame with anchor bolts pipeline protection structure is proposed. On the basis of determining the design seismic landslide thrust and the corresponding anchor force of the bolts in light of the pseudo-static method and transfer coefficient method, the prefabricated frame with anchor bolts is divided into the upper and lower parts with the boundary of the connection between the secondary beams and the lower main beam. Further, the upper part can be regarded as a super-static planar rigid frame structure with two fixed bottom ends, and the lower part can be considered as a Winkler elastic beam on foundation subjected to concentrated force and moment at the two connections. In particular, the deformation compatibility among the upper and lower parts as well as the foundation is fully considered, and the relevant calculation formulas are derived. An iterative method is proposed to specifically calculate internal forces of the prefabricated frame with anchor bolts. An example shows that the deviation between the proposed and the numerical simulation results of the bending moment and shear force on the lower main beam is less than 10%, and the difference between the proposed and the numerical results of the internal forces of the upper structure is also small. The horizontal seismic coefficient has a significant influence on the internal forces of the lower main beam and secondary beams. The internal forces of the frame have a linear positive correlation with the soil weight and cohesion, but a nonlinear negative correlation with the soil internal friction angle. There is a nonlinear positive correlation between the maximum internal forces of the lower main beam and the flexible rigidity of the main beam, while the maximum of the secondary beams has a nonlinear negative correlation with it. The key mechanical components of the frame are the lower main beam and the secondary beams, and the economic optimization design of the upper main beam can be accordingly carried out.
Xie Cheng
,
Li Junjie
,
Liu Jun
,
Xiao Shiguo
. Calculation Method of Prefabricated Frame with Anchor Bolts for Protecting Petroleum Pipelines through Hillslopes[J]. Chinese Journal of Underground Space and Engineering, 2024
, 20(S2)
: 566
-574
.
DOI: 10.20174/j.JUSE.2024.S2.07
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