快速复合方法加固铁路桥梁的力学性能研究

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铁道工程学报 ›› 2015, Vol. 32 ›› Issue (5) : 42.

桥梁工程

快速复合方法加固铁路桥梁的力学性能研究

周长东1 刘斌2

作者信息 +

Research on the Mechanical Properties of Railway Bridge Strengthened with Quick-composite Reinforcement Methods

ZHOU Chang-dong1, LIU Bin2

Author information +

文章历史 +

摘要

&研究目的：针对既有线32 m简支T型梁桥在列车提速时横向刚度不足、振幅过大以及重载列车过桥时承载力不足的问题，提出通过预制混凝土横隔板及体外预应力钢绞线对桥梁进行横向和纵向复合快速加固方法，通过ANSYS和多体动力学软件UM（Universal Mechanism）进行桥梁加固前后静力性能以及车桥耦合动力性能分析。研究结论：（1）提速列车过桥时主要问题是横向振幅过大，而横向加固能够有效提高梁体的横向刚度，使桥梁的横向一阶、扭转一阶自振频率显著提升，减小列车过桥时的动力响应；（2）重载列车过桥时主要问题是承载力不足，竖向挠度过大，竖向加固在提高承载力和竖向一阶自振频率的同时，会导致梁体的横向自振频率变小，需在纵向加固同时进行横向加固；（3）证明了车桥系统共振理论推导公式计算结果的正确性以及桥梁加固后发生共振时桥梁的安全性；（4）加固后桥梁能够满足提速列车以及重载列车运营要求；（5）此加固方法适用于工期紧张且不能中断运营的铁路既有简支桥梁的加固。

Abstract

Abstract：Research purposes： The lateral stiffness and load-bearing capacity of existing 32 m simply-supported concrete T-beam railway bridges fail to meet the needs because of train speed raising and development of heavy train. In order to solve these problems, the quick reinforcement methods that use external prestressing tendons and precast concrete diaphragm plate are studied.Dynamic interaction between train and bridge is studied through ANSYS and multi-body dynamics software UM. Research conclusions：(1) Results of the vehicle-bridge simulation indicate that the main problem of the existing bridge when high-speed train pass through is the lateral amplitude of vibration is too large, lateral reinforcement can effectively improve the lateral stiffness and enhance univalent lateral natural vibration frequency and univalent torsion natural vibration frequency. (2) The main problem of the existing bridge when heavy train passed through is the poor load-bearing capacity and the excessive vertical deflection. Vertical reinforcement can improve the load-bearing capacity and univalent vertical natural vibration frequency, at the same time it will lead to the beam's lateral vibration frequency becoming smaller. So lateral reinforcement and vertical reinforcement should be done at the same time. (3) The validity of vehicle-bridge system’s resonance principle and the reliability of resonance response of the reinforcement bridge are all confirmed. (4) After reinforcement the dynamic responses of bridge and train can meet requirements of relevant regulation. (5) This reinforcement methods can be used for the existing railway concrete simply-supported beam bridge when time is very tense and the railway operation can’t be interrupt.

导出引用

周长东1 刘斌2. 快速复合方法加固铁路桥梁的力学性能研究[J]. 铁道工程学报, 2015, 32(5): 42

ZHOU Chang-dong1, LIU Bin2. Research on the Mechanical Properties of Railway Bridge Strengthened with Quick-composite Reinforcement Methods[J]. Journal of Railway Engineering Society, 2015, 32(5): 42

参考文献

［1］韩燕，夏禾，张楠. 列车提速下32 m PC简支T梁的横向刚度加固方案研究［J］.铁道学报， 2005(1)：90-95.
Han Yan, Xia He, Zhang Nan. Study on Lateral Rigidity Reinforcement Schemes for 32 m Simply-supported PC T-beams under Train Speed Raising ［J］. Journal of the China Railway Society, 2005(1): 90-95.
［2］侯勇，侯刚. 既有铁路混凝土简支梁桥加固技术研究［J］. 铁道工程学报，2011（12）:54-56，63.
Hou Yong, Hou Gang. Research on Reinforcing Technology for Existing Railway Concrete Simply-supported Beam Bridge［J］. Journal of Railway Engineering Society, 2011(12):54-56，63.
［3］熊学玉. 体外预应力结构设计［M］. 北京：中国建筑工业出版社，2005.
Xiong Xueyu. Design of Externally Prestressed Structures［M］. Beijing:China Architecture & Building Press, 2005.
［4］Stokes G G. Discussion of a Differential Equation Relating to the Breaking of Railway Bridge ［J］. Transactions of the Cambridge Philosophical Society, 1849（8）:706-735.
［5］Timoshenko S. On the Forced Vibrations of Bridges［J］. Philosophical Magazine Series, 1922(6):1018-1019.
［6］Fryba L. Dynamic Behavior of Bridges Due to High Speed Trains［J］. Bridges for High Speed Railway, 2004:137-158.
［7］Dietz S, Hippmann G, Schupp G．Interaction of Vehicles and Flexible Tracks by Co-simulation of Multi Body Vehicle Systems and Finite Element Track Models［J］. Vehicle System Dynamics Supplement, 2003（37）:372-384．
［8］Xia H, Zhang N. Dynamic Analysis of Railway Bridge under High Speed Trains. Computers and Structures, 2005(83):1891-1901.
［9］彭斌，张楠，杨静静. 线路加固体系基于车线耦合与有限元的分析［J］. 铁道工程学报，2014（7）:62-68.
Peng Bin, Zhang Nan, Yang Jingjing. Analysis of Railway Reinforced System Based on Vehicle-rail Interaction Theory and Finite Element Theory［J］. Journal of Railway Engineering Society, 2014(7):62-68.
［10］张楠，夏禾. 铁路桥梁在高速列车作用下的动力响应分析［J］. 工程力学，2005（3）:144-151.
Zhang Nan, Xia He. Dynamic Analysis of Railway Bridge Under High Speed Train. Engineering Mechanics,2005（3）:144-151.