The prefabricated joint is
a prominent structural feature that distinguishes prefabricated metro stations
from traditional cast-in-place stations. To investigate the bending deformation and failure
mechanisms of grouted mortise and tenon joints, a comprehensive study is
conducted. Experiments are performed to determine the compressive deformation
characteristics of the grouting material (modified epoxy resin) and its bonding
properties with concrete. Based on these experimental results, a simulation
method is developed to model the joint grouting surface contact, incorporating
the bond strength and bond failure model. Finally, a finite element numerical
model is created and analyzed to evaluate the joint under bending loads. The
results reveal the following: (1) The moment-rotation
curves of the joint closely align with the experimental data, and the crack
distribution patterns observed during bending failure closely match test
results. (2) The numerical results, including the development of principal
tensile stress, the failure of the grout-concrete
bonding relationship, and crack propagation patterns, further reveal the
bending deformation mechanism of the grouted mortise and tenon joints. (3) A
comparative analysis of three simulation methods for grouting surface contact
relationships—bond failure, friction, and tie—demonstrates that using friction or tie contact models leads to an
underestimation of the joint′s flexural load-bearing capacity. (4) The findings highlight the importance of
refined modeling of the grout-concrete bond
relationship in grouted mortise and tenon joints for accurately evaluating
their mechanical performance.
FAN Qi
,
LIN Fang
. Numerical Study on Bending
Performance of Grouted Mortise-Tenon Joint Considering Bonding Strength of Grouting Interface[J]. Tunnel Construction, 2025
, 45(3)
: 532
-538
.
DOI: 10.3973/j.issn.2096-4498.2025.03.008
