A system transformation method is proposed in batches
and staged loading and unloading to control the risk of structural deformation
and cracking during the system transformation between the Vshaped
and temporary columns in the Huangmugang transportation hub. To this end, the
measurement robot and computer vision technology are used to automatically
monitor the displacement of the temporary column top, Vshaped column top, and steelconcrete beam
midspan for early warning. The monitoring results
reveal the following: (1) The measurement robot′s
monitoring results agree with those of computer vision. When the steel cushion
block atop the temporary column is disengaged following staged loading, the
displacement of the temporary column′s top is less than
the designspecified control value of 3 mm.
Furthermore, after the third unloading stage(45% of the total unloading value),
the settlement at the top of the temporary column reaches 86% of its maximum
settlement. (2) While the influence range of system transformation primarily
comprises the current frame and two adjacent frames, totaling three frames, the
maximum deflection of the steelconcrete beam is
approximately 30.0 mm, which is less than the allowable value of 64.0 mm. (3)
Although the north side of the frame moves upward before the south side during
the loading stage, the Vshaped column on the south
side of axis 22 still produces a maximum settlement of 3.5 mm, indicating an asymmetric structural
response. Therefore, the entire structure is safe during the transformation.
YANG Jincheng
,
ZHU Min
,
ZHOU Weiming
,
CHEN Dengwei
,
HONG Chengyu
. Deformation Monitoring and Analysis of System
Transformation in an Underground VShaped Column of a Large Transportation Hub: a Case Study of Huangmugang Comprehensive Transportation Hub[J]. Tunnel Construction, 2022
, 42(11)
: 1947
-1955
.
DOI: 10.3973/j.issn.2096-4498.2022.11.015
