刚构-连续组合桥梁冲击系数多因素灵敏度分析

周勇军;赵煜;史奇彬;宋一凡

振动与冲击 ›› 2012, Vol. 31 ›› Issue (3) : 97-101.

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (3) : 97-101.
论文

刚构-连续组合桥梁冲击系数多因素灵敏度分析

  • 周勇军1,赵煜1,史奇彬2,宋一凡1
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Muti-parameters sensitivity analysis of impact factors for rigid-continuous combined bridge

  • ZHOU Yong-jun1,ZHAO Yu1,SHI Qi-bin2 ,SONG Yi-fan1
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摘要

为了研究影响冲击系数的显著性因素,以某刚构-连续组合桥梁为依托工程,采用三轴二分之一车辆模型,基于通用程序建立了车桥耦合振动有限元分析模型,考虑了车桥频率比、桥面不平整度、车体质量、车辆阻尼比、行车速度、车辆行驶方式、桥梁刚度、桥跨布置和下部结构计算模式等9个影响因素,通过正交试验表研究了该桥在诸因素下结构控制截面的挠度(位移)、弯矩冲击系数,并开展了冲击系数的敏感性因素分析。结果表明,现有规范计算此类桥梁的冲击系数值偏小;车桥频率比、桥面不平度及车辆行驶速度是影响该类桥梁冲击系数的敏感性因素,研究成果为将冲击系数定义为多因素的函数表达式指明了方向。

Abstract

In order to study the sensitive influence parameters of the impact factors for rigid-continuous combined bridge, finite element model was set up based on the bridge-vehicle coupled vibration, the vehicle of which adopted three axles half-car model. The influence parameters included the ratio of bridge and vehicle frequency, the roughness of deck, the mass of vehicle, the damping ratio of vehicle, the velocity of vehicle, the driving mode of vehicle, the rigidity of bridge, the arrangement of bridge and the soil-structure–interaction mode, then orthogonal test table was employed to study the structural impact factors of deformation and bending moment in the critical sections under those parameters respectively, thus the sensitive parameters could be found. The results show that the impact factor of the combined bridge calculated by impact formula of General Code for Design of Highway Bridges and Culverts is relatively lower, and the ratio of bridge and vehicle frequency, the roughness of deck, the velocity of vehicle are the sensitive parameters affecting the impact factors. Therefore the impact factor should be interpreted as the function of muti-parameters rather than only one parameter.

关键词

刚构-连续组合桥梁 / 冲击系数 / 敏感性因素 / 正交试验

Key words

rigid-continuous combined bridge / impact factor / sensitive parameters / orthogonal test

引用本文

导出引用
周勇军;赵煜;史奇彬;宋一凡. 刚构-连续组合桥梁冲击系数多因素灵敏度分析[J]. 振动与冲击, 2012, 31(3): 97-101
ZHOU Yong-jun;ZHAO Yu;SHI Qi-bin;SONG Yi-fan. Muti-parameters sensitivity analysis of impact factors for rigid-continuous combined bridge[J]. Journal of Vibration and Shock, 2012, 31(3): 97-101

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