|Table of Contents|

Impacts of initial internal force and geometric nonlinearity of suspension bridge on bridge-rail interaction(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2020年01期
Page:
82-91
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Impacts of initial internal force and geometric nonlinearity of suspension bridge on bridge-rail interaction
Author(s):
XIE Kai-ze1; 2;  ZHAO Wei-gang1;  CAI Xiao-pei3;  LIU Hao4;  ZHANG Hao1
(1. Structure Health Monitoring and Control Institute, Shijiazhuang Tiedao University, Shijiazhuang 050043, Hebei, China; 2. Beijing Engineering and Technology Research Center of Rail Transit Line Safety and Disaster Prevention, Beijing Jiaotong University, Beijing 100044, China; 3. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China; 4. China Academy of Railway Sciences Corporation Limited, Beijing 100081, China)
Keywords:
railway engineering;  continuous welded rail;  comparative analysis;  bridge-rail interaction;  suspension bridge;  initial internal force;  geometric nonlinearity
PACS:
U213.9
DOI:
10.19818/j.cnki.1671-1637.2020.01.006
Abstract:
Based on the theory of bridge-rail interaction, an approach to reconstruct the displacement-force curve of ballast longitudinal resistance was put forward according to the deformation of suspension bridge under the completed bridge state. A feasibility study on the reconstructing approach was conducted via two aspects of the force and deformation of continuous welded rail(CWR)on a 5×32 m simply supported beam bridge with initial deformation. With the multi-element modelling method and the U.L. formulation method, a rail-girder-hanger-cable-pylon spatial calculation model was established considering the initial internal force and geometric nonlinearity of suspension bridge. Taking a(2×84+1 092+2×84)m long-span suspension bridge as an example, the impacts of initial internal force and geometric nonlinearity of suspension bridge on the bridge-rail interaction under different working conditions were comparatively analyzed. Analysis result shows that the approach put forward to reconstruct the ballast longitudinal resistance can avoid the impact of initial deformation of bridge on the bridge-rail interaction, and make it possible to consider the effect of initial internal force on the bridge-rail interaction. The impact of main cable sag effect on the bridge-rail interaction is less than 1% under each working condition, so the factor can be neglected. The initial internal force of suspension bridge plays an important role under the bending, braking and rail breaking conditions. It can reduce the bending force, braking force and rail broken gap by 22.4%, 12.7% and 9.3%, respectively. The large displacement effect can not only change the distribution law of bending force, but also can significantly reduce the rail broken gap by 22.4%. It is suggested to consider the initial internal force and large displacement effect of suspension bridge under the bending, braking and rail breaking conditions of CWR on suspension bridges. The suspension bridge can be simplified as a continuous beam bridge with a longitudinal constraint at the mid-span and expandable beam ends at both sides under the expansion and contraction condition. The established calculation model can provide accurate simulation results for the design of CWR on suspension bridges. 3 tabs, 10 figs, 33 refs.

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Last Update: 2020-03-24