Parameter influence on the seismic behavior of shallow foundation abutments with anchor plates
Based on the damage characteristics obtained from the post-earthquake investigation of shallow foundation abutments,a shallow foundation abutment with anchor plates was designed for an anchor plate retaining wall.The seismic performance of the proposed abutment was evalua-ted with the quasi-static test and finite element software ABAQUS.The effects of various fac-tors,namely,steel strand diameter,anchor plate layout,ratio of anchor plate area to abutment back area,elastic modulus of abutment backfill,and steel strand length,on the seismic perform-ance of the proposed abutment were explored.Results indicate that the bearing and energy dissi-pation capacities of the abutment improve after the anchor plate is used.The primary causes of structural failure are soil failure and steel strand fracture,and the abutment and anchor plate re-main undamaged.Increasing the diameter of the steel strand in a certain range can considerably improve the bearing capacity of the structure and impede stiffness degradation.The bearing ca-pacity of the abutment is basically unaffected by the different arrangements of the anchor plate.The initial bearing capacity of the structure is high when the ratio of the anchor plate area to the abutment back area is large,but the stiffness degradation is fast in the later stage.The length of the steel strand should not be excessively large beyond the design requirements.
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