首页|实测车流作用下大跨悬索桥吊索疲劳性能分析

实测车流作用下大跨悬索桥吊索疲劳性能分析

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  • 国家科技期刊平台
  • NETL
  • NSTL
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为研究车辆长期作用下悬索桥吊索的疲劳性能，以南京栖霞山长江大桥为工程背景，利用该桥动态称重系统的实测数据，采用有限混合分布拟合了车辆荷载模型。然后，基于时间权重矩阵模拟了桥面多车道随机车流，并基于Ansys计算了随机车流作用下的桥梁动力时程响应。在上述基础上，获取了大桥短吊索、长吊索和限位吊索3组典型吊索的应力时程，并采用名义应力法对其疲劳性能进行分析。结果表明:在随机车流作用下，大部分时间段内吊索应力波动较为平稳;各吊索应力变化趋势与车流量的变化密切相关，短吊索、长吊索以及限位吊索的最大应力幅分别为40、30和25 MPa;在车辆荷载的长期作用下，短吊索的疲劳可靠度显著低于长吊索与限位吊索。
Fatigue performance analysis of suspenders of a long span suspension bridge under monitored traffic flow
To study the fatigue performance of suspension bridge suspenders under the long-term action of ve-hicles,taking Nanjing Qixiashan Yangtze River Bridge as the engineering background,the vehicle load model was fitted by finite mixed distribution using the measured data of the weigh-in-motion system of the bridge.Afterwards,the multi-lane random traffic flow on the bridge deck was simulated according to the time weight matrix.The dynamic responses of the bridge under the random traffic flow were calculated using Ansys soft-ware.On these bases,the stress time histories of three typical suspender groups of short suspender,long sus-pender and displacement limiting suspender of the bridge were obtained,and the fatigue performance was ana-lyzed by nominal stress method.Results show that under the action of random traffic flow,the fluctuation of suspender stress keeps relatively stable during most periods.The variation trend of stress of the suspenders is closely related to the change of traffic volume.The maximum stress amplitudes of the short suspender,the long suspender and the displacement limiting suspender are 40,30,and 25 MPa,respectively.Under the long-term action of the traffic flow,the fatigue reliability of the short suspender is significantly lower than those of the long suspender and the displacement limiting suspender.

suspenders of suspension bridgefatigue performancedynamic weigh-in-motion systemrandom traffic flowdynamic response

茅建校、柯贤东、苏迅、赵楷林、王浩、宗海

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东南大学混凝土及预应力混凝土结构教育部重点实验室,南京 211189

南京公路发展(集团)有限公司,南京 210031

悬索桥吊索 疲劳性能 动态称重系统 随机车流 动力响应

国家重点研发计划资助项目国家自然科学基金资助项目国家自然科学基金资助项目中交集团院士专项资助项目江苏省重点研发计划(产业前瞻与关键核心技术)资助项目

2022YFB37067045233801152108274YSZX-01-2022-01-BBE2021021

2024

10.3969/j.issn.1001-0505.2024.04.019

东南大学学报(自然科学版)
东南大学

东南大学学报(自然科学版)

CSTPCD北大核心
影响因子：0.989
ISSN：1001-0505
年,卷(期)：2024.54(4)
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