|Table of Contents|

Simple-supported Beam Bridge Bearing Capacity Assessment Method Based on Static and Dynamic Model Modification(PDF)

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

Issue:
2022年06期
Page:
122-132
Research Field:
结构工程
Publishing date:

Info

Title:
Simple-supported Beam Bridge Bearing Capacity Assessment Method Based on Static and Dynamic Model Modification
Author(s):
ZHANG Wen-wu1;  ZHANG Rong-feng2;  QI Xing-jun2;  MI Jia-he2
(1. Shandong Hi-speed Group Co.,Ltd., Jinan 250098, Shandong, China; 2. School of Transportation Engineering, Shandong Jianzhu University, Jinan 250101, Shangdong, China)
Keywords:
model modification;  verification coefficient;  bearing capacity evaluation;  influence line;  frequency
PACS:
TU311
DOI:
10.19815/j.jace.2021.07145
Abstract:
In order to complete the evaluation of bridge safety quickly, the method based on static and dynamic test model correction was used to evaluate the bearing capacity of a fabricated reinforced concrete simply-supported beam bridge. Using a single vehicle to drive slowly across the bridge deck, the deflection influence line of key measuring points of the bridge was measured, the modal test on the bridge based on environmental excitation was conducted, and the first five natural vibration frequencies of the bridge were measured. The initial finite element model of the bridge according to the drawings was established, and the benchmark finite element model representing the actual working state of the bridge was obtained by using the field measured deflection influence line and frequency modified initial finite element model. The same test load as the traditional load test was arranged on the benchmark finite element model, and the deflection and strain response of the modified bridge were calculated. The verification coefficient of the actual bridge was calculated according to the relevant evaluation regulations, so as to evaluate the bearing capacity of the bridge. The results show that the accurate finite element correction model can be obtained by combining the measured displacement influence line and frequency of a single heavy vehicle. The evaluation results of bridge bearing capacity evaluation using the model modified by static and dynamic models are very close to the traditional load test, and the accuracy is more than 90%. The evaluation method is time-saving, labor-saving, convenient and fast, and has strong efficiency and feasibility.

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Last Update: 2022-12-20