隧道波纹钢板套衬接头抗弯性能有限元分析

为进一步探讨隧道波纹钢套衬结构纵向连接接头的安全性和适用性问题，对不同型号拼装式波纹钢板纵向接头抗弯力学性能进行研究，选取200 mm×55 mm、300 mm×110 mm和400 mm×150 mm 3种型号波纹钢板试件进行接头抗弯数值模拟。共设计12种工况，对比不同规格螺栓的应力分布规律、变形破坏形式及不同螺栓预紧力条件下的法兰板极限承载力及变形破坏特征，就螺栓应力、跨中挠度、极限承载力、法兰板接缝张开量及塑性破坏等方面进行深入分析。研究结果表明： 1）螺栓主要受拉弯变形，内侧螺栓较外侧螺栓受力更大，率先达到屈服状态； 2）接头薄弱点主要在于法兰板，其更容易发生变形破坏； 3）螺栓预紧力对波纹钢板的极限承载力、跨中挠度及接缝张开量均有一定的影响； 4）大波形波纹钢板极限抗弯承载能力约为深波形和中波形的1.36倍和1.67倍。

Finite Element Analysis on Flexural Performance ofCorrugated Steel Plate Lining Joint in Tunnel

In order to further discuss the safety and applicability of the longitudinal joint of the corrugated steel lining structure in tunnel, the flexural performance of the longitudinal joints of different types of assembled corrugated steel plates are studied, and 3 types of corrugated steel plate specimens of 200 mm×55 mm, 300 mm×110 mm and 400 mm×150 mm are selected for numerical simulation tests of joint flexural resistance. And then 12 simulated working conditions are designed, and the stress and deformation laws of different types of bolts, ultimate bearing capacity and deformation failure characteristics of flange plates under different bolt pre tightening forces are discussed. Finally, the bolt stress, mid span deflection, ultimate bearing capacity, flange joint opening and plastic deformation failure of flange plates are elaborated in detail. The results show that: (1) The bolts are mainly deformed by tension and bending, and the inner bolts have a larger stress than the outer bolts, which makes it yield first. (2) The weakness of joint mainly lies in flange plate, which is prone to deformation damage. (3) The pre tightening force of the bolts has a certain influence on the ultimate bearing capacity, mid span deflection and joint opening of the corrugated steel plates. (4) The flexural bearing capacity of big corrugated steel plate is about 1.36 times and 1.67 times of those of deep and middle corrugated steel plates, respectively.