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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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