|Table of Contents|

Rapid stiffness evaluation of prefabricated simply supported beam bridge based on modal test and equivalent load(PDF)

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

Issue:
2023年04期
Page:
117-124
Research Field:
桥梁工程
Publishing date:

Info

Title:
Rapid stiffness evaluation of prefabricated simply supported beam bridge based on modal test and equivalent load
Author(s):
QI Xingjun1;  QI Sheng1;  SUN Xufa1;  WANG Shanshan2
(1. School of Transportation Engineering, Shandong Jianzhu University, Jinan 250101, Shandong, China; 2. Shandong Hi-speed Group Co., Ltd., Jinan 250098, Shandong, China)
Keywords:
simply supported beam bridge;  stiffness;  rapid evaluation;  equivalent load;  modal deflection
PACS:
TU311
DOI:
10.19815/j.jace.2021.08034
Abstract:
Combining the modal test method without interrupting traffic with traditional reliable static load test methods, an equivalent load modal deflection test method for rapid stiffness evaluation of prefabricated simply supported beam bridges was proposed. Taking prefabricated simply supported hollow slab bridges as the research object, finite element models for undamaged and damaged states were established. The vertical acceleration of the designated measurement point of the main beam under impact excitation was extracted, the modal parameters of the bridge structure was identified and the displacement flexibility matrix of the main beam was predicted. According to Load Test Methods for Highway Bridge, the equivalent load for static load test was designed, and the measured modal deflection of the damaged bridge midspan under the equivalent load was determined. The deflection calibration coefficient was calculated based on the theoretical deflection of the finite element undamaged state, and the stiffness of the damaged bridge was quickly evaluated in combination with the specifications. Through the error analysis of the mid-span modal deflection and theoretical deflection of the bridge, the influence of different measurement point arrangements and different modal orders on the predicted modal deflection was explored. The results show that under impact excitation, whether using a total of 18 measurement points in the midspan and quarter span scheme or only 9 measurement points in the midspan scheme, the first three modal parameters of the bridge can be accurately identified and the predicted modal deflection error is less than 5%, meeting the requirements of engineering accuracy. Using the first three modal parameters is the same as using the first four modal parameters to predict the midspan modal deflection, that is, the second longitudinal vertical bending mode of a simply supported beam does not contribute to the prediction of midspan modal deflection. From the perspective of vibration theory and testing methods, it is demonstrated that rapid stiffness evaluation of simply supported beams can be achieved based on modal testing and equivalent loads, which has good practical engineering application value.

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Last Update: 2023-07-01