Study on Bearing Capacity of Mortise-tenon and Joint-Flange Concrete Assembled Foundation of Transmission Line under Combined Load
Mortise-tenon-flange assembly foundation has excellent application as a new type of slab concrete assembly foundation, but there is a lack of research on its bearing capacity. In order to explore the mechanical characteristics and bearing capacity of this type of foundation under combined load (uplift-horizontal load ), which is different from the traditional cast-in-place foundation, the uplift bearing model of mortise and tenon-flange assembled foundation and the uplift model of cast-in-place foundation with the same specification were established based on the actual geological environment by finite element software. The stress distribution, vertical and horizontal displacement, uplift and horizontal bearing capacity of the foundation were simulated and calculated. The results show that the deformation of the base of the mortise and tenon-flange assembled foundation is much lower than that of the main column, and the bearing capacity of the foundation base has not been fully utilized. There is no substantial difference between the uplift behavior and the cast-in-place foundation. The load-displacement relationship curve shows a typical uplift shape, which can be roughly divided into three stages: linear slow rise stage, plastic accelerated rise stage and linear failure stage. When the uplift cumulative displacement of the foundation reaches about 13 mm and the horizontal cumulative displacement reaches about 10 mm, the foundation enters the limit state, and the ultimate bearing capacity is better than that of the cast-in-place foundation of the same specification, and the displacement at the limit state is not much different from that of the cast-in-place foundation. The foundation shows the stress characteristics of segmented transmission during the pull-out process. After the concrete upper column yields, the mortise-tenon-flange connection node will receive the load transmitted by the upper column, and will continue to transmit the load to the lower column of the foundation after the displacement of the node reaches the limit.
transmission linesmortise-tenon and joint-flange assembly foundationcombined loadultimate bearing capacit
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