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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

36卷

期数:

2019年03期

页码:

101-109

栏目:

出版日期:

2019-05-22

文章信息/Info

Title:

Bearing Capacity Evaluation of Extradosed Cable-stayed Bridge with Double Towers Based on Load Tests

文章编号:

1673-2049(2019)03-0101-09

作者:

吕 梁¹,贾 毅¹,纪云涛²,赵人达¹

(1. 西南交通大学 土木工程学院,四川 成都 610031; 2. 云南省公路科学技术研究院,云南 昆明 650000)

Author(s):

LYU Liang¹, JIA Yi¹, JI Yun-tao², ZHAO Ren-da¹

(1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China; 2. Yunnan Research Institute of Highway Science and Technology, Kunming 650000, Yunnan, China)

关键词:

部分斜拉桥;  荷载试验;  荷载效率系数;  结构校验系数;  冲击系数;  振动模态;  承载能力评估

Keywords:

extradosed cable-stayed bridge;  load test;  load efficiency ratio;  structural verification coefficient;  impact coefficient;  vibration modal;  bearing capacity evaluation

分类号:

U441.2

DOI:

-

文献标志码:

A

摘要:

通过成桥荷载试验来评估双塔部分斜拉桥的承载能力和实际工作状况。基于静载试验测试出各工况下结构控制截面的应变、位移以及典型拉索的索力增量,通过无障碍和有障碍行车试验测试出该桥的动应变响应和冲击系数,采用环境激振法测试出该桥的自振频率、阻尼比等振动模态参数,并将测试结果与有限元计算结果进行了对比分析。结果表明:应变校验系数介于0.34～0.94之间,位移校验系数介于0.58～0.94之间,拉索索力增量校验系数介于0.72～0.78之间,结构校验系数均未超过规范上限值1.0,结构整体强度和刚度均比较有保障; 结构相对残余应变和相对位移最大值分别为17.2%和17.3%,均未超过规范上限值20%,说明该桥在试验荷载下近似处于弹性工作状态; 当有障碍行车车速为20 km·h^-1时,结构冲击系数达到最大值0.79,应注意桥面铺装层局部损伤对结构实际工作状况带来的不利影响; 结构一阶自由振型以竖向振动为主,自振频率实测值大于计算值,结构实际刚度较好。

Abstract:

Bearing capacity and actual working conditions of a extradosed cable-stayed bridge with double towers were evaluated. Structural stain and displacement of control sections as well as cable force increments of typical stay cables under various cases were tested by static test. Dynamic stain response and impact coefficient of the bridge were tested by barrier-free and disabled running tests. Vibration modal parameters such as natural vibration frequency and damping ratio were tested by ambient excitation method. Testing results above were compared with finite element calculation results. The results show that strain verification coefficient is between 0.34 and 0.94. Displacement verification coefficient is between 0.58 and 0.94. Verification coefficient of cable force increment for stay cables is between 0.72 and 0.78. Various verification coefficients are less than 1.0 which is upper limit value in related specification. Strength and rigidity of the whole structure both have a certain security. The maximum relative surplus strain and displacement are respectively 17.2% and 17.3%, which are both less than 20% that is upper limit value in related specification. All above demonstrate that the bridge is approximately under elastic working conditions. The maximum structural impact coefficient is 0.79 when disabled vehicle speed is 20 km·h^-1. Local damage of bridge deck layers has a disadvantage influence on actual working conditions, which is must be noticed. The first order free vibration mode is dominated by vertical vibration. Measured value of free vibration frequency is greater than calculated value. Actual rigidity of the structure is preferable.

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备注/Memo

备注/Memo:

收稿日期:2018-08-07
基金项目:国家自然科学基金项目(51308471); 国家重点研发计划项目(2017YFB1201204)
作者简介:吕 梁(1988-),男,河南洛阳人,工学博士研究生,E-mail:lvliang19881105@qq.com。
通信作者:赵人达(1961-),男,贵州毕节人,教授,博士研究生导师,工学博士,E-mail:rendazhao@163.com。

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更新日期/Last Update: 2019-05-23