| 苏凯,龚睿,陶军,徐世濠,朱洪泽.输水隧洞管片衬砌梁-弹簧模型中接头转动刚度计算方法[J].水利学报,2025,56(5):611-623 |
| 输水隧洞管片衬砌梁-弹簧模型中接头转动刚度计算方法 |
| Calculation method of joint rotational stiffness in segmental lining beam-spring model of water conveyance tunnel |
| 投稿时间：2024-07-29 |
| DOI：10.13243/j.cnki.slxb.20240481 |
| 中文关键词: 输水隧洞 单层管片衬砌 接头力学模型 接头转动刚度迭代计算 联合数值仿真计算 |
| 英文关键词: water conveyance tunnel single-layer segmental lining joint mechanical model joint rotational stiffness iterative calculation co-simulation numerical computation |
| 基金项目:国家自然科学基金项目（51879207） |
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| 中文摘要: |
| 输水隧洞单层管片衬砌需同时承担内、外压荷载，管片纵向接头处转动刚度与端面内力组合呈非线性关系，转动刚度取值是梁-弹簧模型计算结果合理与否的关键。针对双排螺栓布置形式管片接头，构建混凝土受压与螺栓受拉的非线性接头力学模型，在各受力状态下进行求解，并与接头试验作对比验证；再基于ABAQUS与MATLAB的联合数值仿真计算平台，采用二分法迭代方式，将接头非线性力学效应运用至管片衬砌梁-弹簧模型中，并与足尺试验作对比验证；最后分析各内水压工况管片衬砌力学响应。结果表明：基于接头力学模型的各受力状态计算结果与接头试验规律一致，能较好反映接头转动性能随内力变化规律；提出的接头转动刚度二分法迭代方式简便高效、计算精度高、收敛稳定，使整环管片衬砌各接头转动刚度取值适应其内力条件，与足尺试验各项指标对比吻合度较高。内水压作用下管片轴力大幅下降，“横椭圆”变形趋势增强，各接头逐渐进入多层螺栓作用状态。 |
| 英文摘要: |
| 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 combination 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 nonlinear 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 rotational 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. |
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