基于模态测试的斜交简支梁桥建造质量快速评估
Evaluation of Construction Quality of Simply Supported Beam Skew Bridges Based on Modal Test
梁金平 1杨洪超 2亓兴军2
作者信息
- 1. 鲁南高速铁路有限公司 济南 250014
- 2. 山东建筑大学交通工程学院 济南 250101
- 折叠
摘要
以实际工程中的一座新建公路斜交宽简支梁桥为例,探究模态测试技术和模态刚度测试方法在新建桥梁工程验收评价中的应用.设计虚拟静载试验方案,选取参与计算的最少模态阶数;进行环境激励桥梁模态测试试验,识别桥梁前三阶实测模态参数,基于实测模态参数识别结构柔度矩阵,预测虚拟静载试验的实测模态挠度,对比桥梁的设计理论挠度,结合相关规范评估建造状况.结果表明:虚拟静载试验荷载作用下,仅采用前3阶模态参数即可准确预测简支梁桥的跨中模态挠度,中载和偏载工况下的误差均在5％以下;环境激励模态测试试验可以准确识别斜交宽简支梁前3阶模态参数,无需对桥梁施加额外激励措施;结合规范计算的桥梁跨中挠度校验系数在0.55～0.70之间,表明该简支梁桥建造状况良好;基于模态测试,可以准确评估简支梁桥建造质量,测试过程方便快捷,在实际工程中具有广阔的应用前景.
Abstract
Taking a new simply supported girder skew bridge in an actual project as an example,the appli-cation of modal test and modal rigidity identification in the acceptance and assessment of new bridges was ex-plored.A virtual load test was designed,and the minimum modals was determined for calculation.Modal test under environmental excitation was conducted to identify the first three measured modal parameters and the structural flexibility matrix of the bridge.Based on the measured modal parameters,the measured modal deflec-tion under the virtual load test was predicted.Compared with the theoretical deflection under the design model,combined with relevant codes,the construction quality of bridge was evaluated.The results showed that the mo-dal deflection of the simply supported girder bridge can be predicted by using only the first three order modal pa-rameters under the virtual load test,with the error less than 5％under the medium load case and partial load case.The first three order modal parameters of the skew simply supported girder were accurately identified by the modal test under the environmental excitation.The mid span deflection calibration coefficients calculated ac-cording to the specifications were between 0.55 and 0.70,indicating that the simply supported girder bridge was in good construction condition.The construction quality of the simply supported girder bridge can be evalua-ted accurately,conveniently,and quickly by modal test,which has broad application prospects in practical en-gineering.
关键词
斜交简支梁桥/模态测试/虚拟静载试验/校验系数Key words
Simply supported girder skew bridge/Modal test/Virtual load test/Calibration coefficients引用本文复制引用
基金项目
山东省交通运输厅科技计划项目(2022B06)
山东省企业技术创新项目(202250101726)
山东省企业技术创新项目(202160101415)
出版年
2024
NETL
NSTL
万方数据