Journal
STRUCTURAL ENGINEERING AND MECHANICS
Volume 84, Issue 3, Pages 413-421Publisher
TECHNO-PRESS
DOI: 10.12989/sem.2022.84.3.413
Keywords
dynamic modification; frequency variation; mass-normalized mode shape; modal identification; parked vehicle-bridge system
Categories
Funding
- National Natural Science Foundation of China
- Natural Science Fund for Distinguished Young Scholars of Anhui Province
- Shenzhen Science and Technology Program
- Key Research and Development Project of Anhui Province
- [51878234]
- [2208085J20]
- [KQTD20180412181337494]
- [1804a0802204]
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This study proposes an innovative method to estimate the modal parameters for bridges using a parked vehicle, and it presents a mathematical formulation and algorithm for estimating the modal parameters based on frequency measurement.
Modal parameters are the main dynamic characteristics of bridge. This study aims to propose an innovative route to estimate the modal parameters for bridges by using a parked vehicle in which mode shapes with high accuracy and spatial resolution are identified by frequency measurement. Based on the theory of dynamic modification and modal identification, the mathematical formulation between the parked mass induced frequency variation and the modal parameters of a bridge is derived. Then this mathematical formulation is extended to a parked vehicle -bridge system. The arithmetic and processes for estimating the modal parameters based on the identified frequency variation of the vehicle -bridge systems when the vehicle locates at sequentially arranged positions are presented. Finally the proposed method is applied to several simulated bridges of different types. The results indicate that it can estimate the modal parameters with high accuracy and efficiency.
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