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Calculation method of joint rotational stiffness in segmental lining beam-spring
model of water conveyance tunnel
1
1
1
SU Kai 1,2,3 ,GONG Rui ,TAO Jun ,XU Shihao ,ZHU Hongze 1
(1. State Key Laboratory of Water Resources Engineering and Management,Wuhan University,Wuhan 430072,China;
2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering,Ministry of Education,Wuhan 430072,China;
3. Hubei Key Laboratory of Water System Science for Sponge City Construction,Wuhan University,Wuhan 430072,China)
Abstract:The single-layer segmental lining in the water conveyance tunnel needs to bear both internal and external
pressure loads. A nonlinear relationship exists between the rotational stiffness at the longitudinal joint and the combi⁃
nation of internal force at the end face. Therefore,the value of the rotational stiffness is the key to the rationality of
the calculation results of the beam-spring model. For the double-row bolt arrangement of segmental joints,a nonlin⁃
ear joint mechanical model is constructed with concrete compression and bolt tension,and the solution is obtained
under each stress state and compared with the joint test for verification. Based on the co-simulation platform of
ABAQUS and MATLAB,the nonlinear mechanical effect of the joint is applied to the beam-spring model with the
method of dichotomy iteration,and compared with the full-scale test. Finally,the mechanical response of segmental
lining under internal water pressure is analyzed. The results show that the calculation results of each stress state based
on the joint mechanical model are consistent with the joint test results,which can reflect the rule of the joint rota⁃
tional performance with the internal force. The proposed dichotomous iterative method of joint rotational stiffness is
convenient,efficient,highly accurate,and stable convergence,which makes the rotational stiffness of each joint
adapt to the internal force conditions,and the results are in good agreement with the indexes of the full-scale test.
Under the action of internal water pressure,the axial force of the segment decreases greatly,the deformation trend of
the transverse ellipse increases,and the joints enter the multi-row bolting action state.
Keywords:water conveyance tunnel;single-layer segmental lining;joint mechanical model;joint rotational stiff⁃
ness iterative calculation;co-simulation numerical computation
(责任编辑:韩 昆)
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