预制管廊横向接头抗弯力学模型及取值方法

接头导致预制预应力综合管廊结构刚度分布不均匀，内力以及变形发生变化，而抗弯刚度是衡量管廊接头性能的重要指标以及评价管廊结构整体力学性能的重要参数.在考虑横向接头截面实际构造形式以及受力变形特点的基础上，通过内力平衡和变形协调条件，建立了可以表征接头截面从受力到破坏各阶段的力学模型以及相应的理论解析表达式.通过数值模拟的方法对接头抗弯刚度影响因素进行了敏感性分析，并在此基础上将理论计算结果与数值模拟结果进行对比，最后根据得出的抗弯刚度变化规律提出了管廊横向接头抗弯刚度两阶段取值方法，研究结果可为预制管廊的设计和理论分析提供参考.

Bending Mechanical Model of Transverse Joints in Precast Prestressed Municipal Tunnel and Its Value Method

Joints lead to uneven distribution of structural rigidity of the precast prestressed municipal tunnel(PPMT)， internal forces and deformation correspondingly change，and bending stiffness is an important indicator to evaluate the performance of PPMT joints and an important factor to evaluate the overall mechanical properties of PPMT structures. After considering the actual structural form of the transverse joint section and the characteristics of force deformation， the mechanical model that can characterize the joint section from force to failure and the corresponding analytical expressions were established through the internal force balance and deformation coordination conditions. The sensitivity analysis of the factors affecting the bending stiffness of joints was carried out through numerical simulations. Based on this， the theoretical calculation results were compared with the numerical simulations. Finally， according to the obtained law of bending stiffness change， two-stage bending stiffness method for transverse joints of PPMT was proposed. The results of the study can provide reference for the design and theoretical analysis of PPMT.