Analysis of dynamic response of steel-concrete composite beam bridge superstructure under rockfall impact

KANG Juntao; ZHANG Hao

doi:10.13471/j.cnki.acta.snus.2020.04.21.2020B038

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Analysis of dynamic response of steel-concrete composite beam bridge superstructure under rockfall impact

Research articles | 更新时间：2023-11-01

- Analysis of dynamic response of steel-concrete composite beam bridge superstructure under rockfall impact
- Acta Scientiarum Naturalium Universitatis Sunyatseni Vol. 60, Issue 6, Pages: 36-42(2021)
- 作者机构：
  
  武汉理工大学土木工程与建筑学院，湖北武汉 430070
- 作者简介：
- 基金信息：
- DOI：10.13471/j.cnki.acta.snus.2020.04.21.2020B038
  CLC： TU312.3
- Published：25 November 2021，
  
  Published Online：16 September 2020，
  
  Received：21 April 2020，
  
  Accepted：16 May 2020
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康俊涛,章豪.落石撞击下钢混组合梁桥上部结构动力响应分析[J].中山大学学报(自然科学版),2021,60(06):36-42.

KANG Juntao,ZHANG Hao.Analysis of dynamic response of steel-concrete composite beam bridge superstructure under rockfall impact[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2021,60(06):36-42.
康俊涛,章豪.落石撞击下钢混组合梁桥上部结构动力响应分析[J].中山大学学报(自然科学版),2021,60(06):36-42. DOI： 10.13471/j.cnki.acta.snus.2020.04.21.2020B038.

KANG Juntao,ZHANG Hao.Analysis of dynamic response of steel-concrete composite beam bridge superstructure under rockfall impact[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2021,60(06):36-42. DOI： 10.13471/j.cnki.acta.snus.2020.04.21.2020B038.

摘要

基于HJC混凝土损伤本构模型，利用非线性显式动力分析软件ANSYS/LS-DYNA建立了钢混组合梁桥上部结构的有限元模型，并采用能量守恒原理检验了计算结果的稳定性。从落石速度、落石质量、接触面积、碰撞位置四个影响因素方面，研究了钢混组合梁桥上部结构在落石撞击下的动力响应。研究表明：①各影响因素中，落石速度变化对钢混组合梁桥上部结构的影响最显著；②落石对桥面板的破坏以局部破坏为主；③综合了落石速度和落石质量的落石动能可以作为落石撞击钢混组合梁桥研究中的自变量；④碰撞位置不变时，落石动能与混凝土损失体积呈正相关。

Abstract

Based on the Holmquist-Johnson-Cook（HJC） concrete damage constitutive model， the finite element model of the superstructure of the steel-concrete composite beam bridge was established by the nonlinear explicit dynamic analysis software ANSYS / LS-DYNA， and the stability of the calculation results was verified using the energy conservation principle. The dynamic response of the superstructure of the steel-concrete composite beam bridge under the impact of rockfall is studied from four aspects of rockfall speed， rockfall quality， contact area and collision position. The research shows， ① of all influencing factors， the change of rock fall speed has the most significant effect on the superstructure of the steel-concrete composite beam；② the damage to the bridge deck caused by rockfall is mainly local damage；③ rockfall kinetic energy， which combines the speed of rockfall and the quality of rockfall， can be used as an independent variable in the study of rockfall impacting a steel-concrete composite beam bridge；④ when the collision position is unchanged， the kinetic energy of rockfall is positively correlated with the volume of concrete loss.

关键词

钢混组合梁桥落石撞击动力响应有限元分析

Keywords

steel-concrete composite beam bridgerockfall impactdynamic responsefinite element analysis

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