Axial force identification for uncertain stiffness and boundary constraints

被引：0
作者：
Li D. [1 ,2 ]
Chen Q. [1 ,2 ]
Wei D. [3 ]
Guo X. [3 ]
Jiang T. [1 ,2 ]
机构：
[1] Department of Civil and Environmental Engineering, Shantou University, Shantou
[2] Guangdong Engineering Center for Structure Safety and Health Monitoring, Shantou University, Shantou
[3] State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2022年 / 41卷 / 20期
关键词：
bending stiffness; boundary conditions; identification of axial force; modal information; Timoshenko beam;
D O I：
10.13465/j.cnki.jvs.2022.20.026
中图分类号：
学科分类号：
摘要：
As the main force component of a bridge and a long-span spatial structure in civil engineering, the measurement of axial force is very important. At present, axial force identification of truss structures is mostly based on known boundary constraint conditions and stiffness of struts. However, a large number of studies have shown that the boundary constraint conditions of pull struts in practical engineering are complex with the change of loads and environmental conditions, and their actual stiffness is different from the design stiffness. Based on the dynamic equation of the classical Timoshenko beam theory, it is found that there is a certain functional relationship between the axial force and the flexural rigidity of the rods when the modal information is known-Therefore, a method for identifying the axial force and flexural rigidity of the rods under unknown boundary constraints was proposed-The validity of the method was verified by numerical simulation of a simply supported beam and axial force identification tests of three kinds of bars with different sections on a drawing machine. © 2022 Chinese Vibration Engineering Society. All rights reserved.
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页码：208 / 215
页数：7
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