Comparative test is conducted on mechanical properties
such as ultimate bearing capacity, flexural stiffness, bending deflection, and
failure form of the traditional lattice girder and the selfdesigned
fourbar steel tube frame support structures under
individual load and common load conditions using Abaqus general finite element
software and comprehensively considering the thickness of the steel tube,
member weight, material cost and other influencing factors. The results show
that: (1) The flexural stiffness, bearing capacity, deformation, and failure
form of the steel tube frame are different from those of lattice girder. In the
case of similar steel weight, the steel tube frame has higher strength and
flexural stiffness, meanwhile, the structural deformation and stress are also
rational. (2) The bearing capacity of the steel tube frame is significantly
affected by the thickness of the steel tube. The bearing capacity decreases
with decreasing steel tube thickness. When the thickness reaches a certain value,
continuing to increase the thickness will have limited effect on improving the
overall strength and bending stiffness of the component, and will increase the
weight and material cost of the component accordingly. (3) Under the condition
of single load, the bearing capacity of lattice girder is 44.5 kN·m, which is 39.3% lower than that of PG-2 steel tube frame. Under
this condition, the weight of the steel tube frame is slightly lower than that
of the lattice girder, and the unit price per linear meter is higher. (4) The
ultimate load of the lattice girder concrete member is 174.6 kN·m, which is 2.7% and 30.6% lower than the steel tube frame concrete
members C+PG-2 and C+PG-6, respectively. (5) The steel tube frame has good
applicability to the surrounding rock with a large deformation rate at the
early stage.
SONG Yuan
,
HUANG Mingli
,
LI Zhaoping
. Comparative Tests on Mechanical Properties of Steel
Tube Frame and Traditional Lattice Girder Used in Tunnel[J]. Tunnel Construction, 2020
, 40(S2)
: 161
-173
.
DOI: 10.3973/j.issn.2096-4498.2020.S2.021
