|Table of Contents|

Research on Deflection Evaluation Method of Continuous Girder Bridge Based on Environmental Excitation(PDF)

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

Issue:
2021年04期
Page:
73-79
Research Field:
Publishing date:

Info

Title:
Research on Deflection Evaluation Method of Continuous Girder Bridge Based on Environmental Excitation
Author(s):
QI Xing-jun1; 2;  SUN Xu-fa1; 2;  ZHAO Yue1; 2;  LI Hong-yin3;  WANG Shan-shan3
(1. School of Transportation Engineering, Shandong Jianzhu University, Jinan 250101, Shandong, China; 2. Shandong Co-innovation Center for Disaster Prevention and Mitigation of Civil Structures, Jinan 250101, Shandong, China; 3. Qilu Transportation Development Group, Jinan 250101, Shandong, China)
Keywords:
static load test;  modal deflection;  flexibility matrix;  mass-normalized modal shape;  SSI
PACS:
U447
DOI:
10.19815/j.jace.2020.08013
Abstract:
In order to study the feasibility of deflection evaluation method of continuous beam bridge in service based on environmental excitation, the bridge static load test scheme was designed according to the Load Test Methods for Highway Bridge. The stochastic subspace identification(SSI)method was used to measure and identify the modal parameters of the bridge under environmental excitation. Combined with the bridge finite element model, the mass matrix was extracted, the measured modal shapes of the bridge were mass normalized.Then,the measured displacement compliance matrix of the bridge was identified, and the measured modal deflection of the bridge under static load was calculated.Finally, the bearing capacity of the bridge was evaluated according to the code. Taking a 4-span continuous beam bridge as an example, the finite element model of damaged bridge was established. Based on the environmental excitation of finite element numerical simulation, the flexibility matrix and modal deflection of the bridge under test load were predicted, and the calibration coefficient of static load test was calculated by comparing with the theoretical design deflection of the initial nondestructive bridge. The results show that the maximum deflection relative error of each measuring point is less than 6%, which basically meets the engineering precision requirements. According to the code, the bearing capacity of the damaged bridge beam does not meet the design requirements. The method can accurately evaluate the bearing capacity of existing bridges, and the evaluation method of bearing capacity of continuous beam bridges based on environmental excitation is effective and feasible.

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Last Update: 2021-07-10