桥墩沉降下齿轨-超大坡度桥梁系统适应性及安全性研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (6) : 93-103.

论文

兆玮1，张梦琪1，王浪1，李世辉1，袁密奥1，陈志辉2，杨吉忠2

作者信息 +

Adaptability and safety of a toothed rail-bridge system with extra large slope under pier settlement

CHEN Zhaowei1，ZHANG Mengqi1，WANG Lang1，LI Shihui1，YUAN Mi’ao1，CHEN Zhihui2，YANG Jizhong2

Author information +

文章历史 +

摘要

我国规划了多条含有超大坡度桥梁的齿轨铁路线路，随着服役时间增长，桥墩沉降问题难以避免，易造成齿轨结构局部应力过大，严重时还会导致连接螺栓断裂，威胁齿轨系统的安全性和稳定性。针对该问题，详细考虑齿轮-齿轨非线性啮合行为、轮轨非线性接触行为以及桥墩沉降等复杂因素，建立桥墩沉降下齿轨车辆-齿轨(轨道)-超大坡度桥梁系统耦合动力学模型，研究列车通过时桥墩沉降对齿轨垂/纵向变形、应力、加速度以及连接螺栓应力的影响，最终提出山区大坡度齿轨铁路桥墩沉降安全控制值。研究表明：在齿轮齿轨啮合作用和轮轨作用等多荷载综合作用下，桥墩沉降极有可能导致齿轨连接螺栓发生断裂；当桥墩沉降量达到6.76mm时，连接螺栓剪切应力达到其许用剪切强度235MPa，可能发生断裂，严重威胁结构稳定性和行车安全；齿轨结构应力远小于齿轨抗拉强度；齿轨最大变形量可达桥墩沉降量的140%；齿轨振动主频位于70~80Hz；桥墩沉降对连接螺栓应力和齿轨变形的影响较为显著，而对齿轨振动、应力的影响较小。

Abstract

China has planned a number of rack railway lines with super-large slope bridges. With the increase of service time, the problem of pier settlement is difficult to avoid, and it is easy to cause excessive local stress in the rack structure. In serious cases, it will also lead to the fracture of connecting bolts, threatening the safety and stability of the rack system. To solve this problem, taking into account the complex factors such as the nonlinear meshing behavior of the gear-track, the nonlinear contact behavior of the wheel-rail and the settlement of the bridge pier, the coupled dynamic model of the rack-rail vehicle-rack (track) - super-large slope bridge system under the settlement of the bridge pier is established. It study the vertical/longitudinal deformation and stress of the rack caused by the settlement of the bridge pier when the train passes. Based on the influence of the stress of connecting bolts and the vertical/longitudinal vibration acceleration of the rack at the mid-span of the bridge, the safety control value of the settlement of the pier of the mountain railway with large slope rack is finally proposed. The research shows that under the combined action of multiple loads such as gear rack meshing and wheel rail action, the settlement of bridge pier is likely to cause the fracture of gear rail connecting bolts; When the settlement of the pier reaches 6.76 mm, the shear stress of the connecting bolt reaches its allowable shear strength of 235 MPa. It may cause fracture, seriously threatening the structural stability and driving safety; The structural stress of the gear rail is far less than the tensile strength of the gear rail; The maximum deformation of the rack can reach 140% of the settlement of the pier; The main frequency of gear rail vibration is 70~80Hz; The influence of pier settlement on the stress of connecting bolts and the deformation of gear rail is relatively significant, while the influence on the vibration and stress of gear rail is relatively small.

导出引用

兆玮1，张梦琪1，王浪1，李世辉1，袁密奥1，陈志辉2，杨吉忠2. 桥墩沉降下齿轨-超大坡度桥梁系统适应性及安全性研究[J]. 振动与冲击, 2024, 43(6): 93-103

CHEN Zhaowei1，ZHANG Mengqi1，WANG Lang1，LI Shihui1，YUAN Mi’ao1，CHEN Zhihui2，YANG Jizhong2. Adaptability and safety of a toothed rail-bridge system with extra large slope under pier settlement[J]. Journal of Vibration and Shock, 2024, 43(6): 93-103

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