The authors
investigate how concrete voids located at the base of steelshelled
concrete angle connectors affect their shear performance and propose an
effective repair method for these voids. Focusing on the angle steel connectors
in the immersed tunnel of the Shenzhen－Zhongshan link,
eight fullscale test specimens are designed. Shear
performance tests and finite element simulations are conducted with varying
parameters such as void shape, void repair, and concrete strength. The findings
reveal that: (1) In ordinary concrete specimens, crush damage primarily occurs
within the angle′s internal concrete, with the damage
mode being minimally influenced by the void form and repair. (2) Concrete voids
significantly reduce the shear bearing capacity and stiffness of angle steel
connectors, with reductions of up to 32.8% and 76.9%, respectively, in
specimens with a triangular prism void. (3) While void repair enhances the
shear load capacity and stiffness of the connectors, the improvement is limited
due to the challenges in achieving cohesive bonding between the repair material
and the void interface. (4) Substituting ordinary concrete with ultrahigh performance concrete (UHPC) without repairing the void
increases the shear bearing capacity of the specimen by 77% compared to those
without voids. However, the shear stiffness is decreased by 8.9% compared to
specimens with voids. (5) Despite UHPC′s superior
mechanical properties, it cannot effectively increase the shear stiffness due
to significant deformation in the angle steel connectors caused by the voids.
(6) Finite element analysis indicates that improving the mechanical properties
of the repair material does not significantly enhance the shear bearing
capacity postvoid repair in triangular prismshaped voids.
GUO Yawei
,
JIN Wenliang
,
SONG Shenyou
,
FU Baiyong
.
Impact of Concrete Void Repair on Mechanical
Performance of
Angle Steel Connectors
[J]. Tunnel Construction, 2024
, 44(3)
: 526
-534
.
DOI: 10.3973/j.issn.2096-4498.2024.03.010
