首页|不同道路服务水平下连续梁桥动力响应研究

不同道路服务水平下连续梁桥动力响应研究

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为了解不同道路服务水平与桥梁动力响应间的内在关系,以(50+100+50)m三跨连续梁桥为工程实例,采用交通流理论,引入平均车头间距与车流密度的相互关系,获取道路服务水平为一级至四级所对应的车辆间距分布规律,基于模态综合法和结构动力学原理,通过轮-桥之间的几何位移和力学耦合关系,组建多车车桥耦合时变动力分析模型,提出多车车桥耦合振动系统数值分析方法,研究不同车辆数量和不同道路服务水平下桥梁关键截面动力响应的变化规律.结果表明:随着车辆数量逐渐增加,桥梁关键截面处的挠度响应时程曲线呈先增大后减小的趋势变化,其中当桥面上的车辆数量为4 辆时,桥梁关键截面的挠度响应幅值达到最大;当桥面上的车辆数量继续增加到8辆时,桥梁挠度响应幅值达到基本稳定.在此基础上,计算得出不同车辆间距变化,即随着道路服务水平由一级变化到四级时,桥梁关键截面挠度响应幅值呈增大趋势,其动力响应均大于单车作用下桥梁挠度响应幅值;而桥梁冲击系数则呈现先增大后减小的变化趋势,也均大于单车规范取值;在不同道路服务水平中均存在有利车队布置形式,使得桥梁振动响应影响较小.
Study on Dynamic Response of Continuous Beam Bridge with Different Road Service Levels
In order to understand the inherent relationship between different road service levels and bridge dynamic response,a(50+100+50)m three-span continuous beam bridge is taken for an engineering example.The relationship between average headway and traffic density is introduced by using the traffic flow theory to obtain the distribution rule of vehicle spacing corresponding to road service level 1 to level 4.Based on modal synthesis method and structural dynamics theory,a multi vehicle bridge coupling time-varying dynamic analysis model is established through the geometric displacement and mechanical coupling relationship between wheels and bridges.A numerical analysis method for multi vehicle bridge coupling vibration system is proposed.The variation rule of dynamic response of key sections of bridges is studied with different vehicle numbers and road service levels.The result shows that(1)with the number of vehicles gradually increase,at the key sections of bridge,the deflection response time history curve shows a trend of increasing first and then decreasing,when the number of vehicles on the bridge deck is 4,the deflection response amplitude of key sections of bridge reaches maximum;(2)when the number of vehicles on the bridge deck continues to increase to 8,the deflection response amplitude of the bridge reaches basic stability,based on this,the variation of different vehicle spacing is calculated,that is,as the road service level changes from level 1 to level 4,the deflection response amplitude of the key sections of bridge shows an increasing trend,and its dynamic response is greater than the deflection response amplitude of the bridge under the action of a single vehicle;(3)the impact coefficient of the bridge shows a trend of increasing first and then decreasing,which is also greater than the value specified in the single vehicle specification;(4)with different road service levels,there are favorable vehicle fleet layouts,which make the bridge vibration response less affected.

bridge engineeringdynamic responsemodal superposition methodcontinuous beam bridgeroad service level

韩智强、谢刚、李路遥、赵洲、董海青

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太原科技大学 车辆与交通工程学院,山西 太原 030024

太原科技大学 先进控制与装备智能化山西省重点实验室,山西 太原 030024

山西华阳集团新能股份有限公司供电运维管理中心,山西 太原 030024

桥梁工程 动力响应 模态叠加法 连续梁桥 道路服务水平

国家自然科学基金山西省青年基金山西省高等学校科技创新项目山西省研究生精品教学案例项目太原科技大学研究生联合培养示范基地项目山西省重点研发计划山西省教学改革项目

519780632022030212123062022L3022023AL30JD2022019201903D121176J20230840

2024

10.3969/j.issn.1002-0268.2024.02.010

公路交通科技
交通运输部公路科学研究院

公路交通科技

CSTPCD北大核心
影响因子：1.007
ISSN：1002-0268
年,卷(期)：2024.41(2)
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