盾构衬砌管片接头内力-变形统一模型及试验分析

首先在钢筋混凝土管片系列接头试验的基础上,总结提出了接头弯矩-相对转角关系的线性、双线性和非线性模型,以及接头轴力-相对轴向变形和剪力-相对剪切变形关系的分段式模型,并给出了用于描述荷载偏心距和螺栓初始扭矩对于接头刚度影响的理论模型。其次,基于平板型和弧型管片接头的受弯试验结果,分别给出了在有无防水密封垫情况下各类转动刚度模型参数的取值方法,提出了不同条件下的转动刚度模型选择依据,研究了不同螺栓初始扭矩和轴力对接头转动刚度取值的影响;基于平板型管片接头剪切试验结果,分别给出了在有无防水密封垫情况下三阶段剪切刚度模型的参数取值方法。研究结果验证了各接头刚度模型的有效性,将对盾构衬砌结构梁-接头模型计算理论的应用起到重要的推动作用。

Unified model for internal force and deformation of shield segment joints and experimental analysis

First, based on a series of tests on reinforced concrete segment joints, the rotational moment-angle models for segment joints including linear, bilinear and nonlinear models and the axial force-deformation and shear force-deformation piecewise models are summarized and proposed, and the theoretical models are also given to describe the effect of the initial torque of bolts and axial force on joint stiffness. Second, based on the bending tests on flat plate segments and arch segments with or without sealing materials, the parameter determination methods for various stiffness models and the model selection principles are proposed, and the effect of the initial torque of bolts and axial force on joint stiffness is discussed. Based on the shear tests on flat plate segment joints with or without sealing materials, the parameter determination method for three-stage shear force resistance stiffness model is proposed. The results have proved the applicability of these joint stiffness models and will promote the application of beam-joint model theory in design practice.