Abstract The infiltration of gas and water into the tunnel may cause serious safety problems and the control of leakage should not be underestimated in the design phase. Simulating the mechanical behaviour of longitudinal joints in segmented tunnel linings in a reliable manner serves not only from the viewpoint of structural design but also for the evaluation of the sealant capacity of the lining. Joints may be subjected both to monotonic or cyclic loading (e.g. earthquakes or groundwater oscillations). Excessive relative rotations may produce plastic deformations (i.e. damage of the joint) and reduction of the sealant capacity. Most of the current mechanical models are able to capture the monotonic behaviour of joints whereas the cyclic behaviour has not been investigated to the same extent. In this paper, a cyclic model for longitudinal joints that is capable to simulate the cyclic behavior of asymmetric, bolted cross-sections is proposed. The distinctive feature of the proposed model is the variation of the rotational stiffness of the joint that depends on: (i) the sign of bending moment, (ii) level of axial load, and (iii) damage accumulation or failure. The reliability of the formulation is evaluated through comparison with experimental data.

中文翻译：

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管片隧道衬砌纵向节点损伤评估循环模型

摘要 隧道内气体和水的渗入可能会造成严重的安全问题，设计阶段不应低估泄漏的控制。以可靠的方式模拟分段隧道衬砌纵向接头的力学行为不仅从结构设计的角度来看，而且还用于评估衬砌的密封能力。接头可能会承受单调或循环载荷（例如地震或地下水振荡）。过度的相对旋转可能会产生塑性变形（即接头损坏）和密封剂容量的降低。大多数当前的机械模型都能够捕捉关节的单调行为，而循环行为尚未得到同等程度的研究。在本文中，提出了一种能够模拟非对称螺栓连接横截面循环行为的纵向接头循环模型。所提出模型的显着特征是关节旋转刚度的变化，这取决于：(i) 弯矩的符号，(ii) 轴向载荷水平，以及 (iii) 损伤累积或失效。通过与实验数据的比较来评估配方的可靠性。