|Table of Contents|

Numerical Method of Static Load Test for Skew Bridge Based on Modal Deflection(PDF)

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

Issue:
2020年03期
Page:
55-62
Research Field:
Publishing date:

Info

Title:
Numerical Method of Static Load Test for Skew Bridge Based on Modal Deflection
Author(s):
QI Xing-jun12 ZHAO Yue12 ZHAO Qi12
(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, Shandong Jianzhu University, Jinan 250101, Shandong, China)
Keywords:
modal deflection skew bridge error analysis displacement flexibility matrix static load test
PACS:
TU973.2
DOI:
10.19815/j.jace.2019.10060
Abstract:
In order to explore the feasibility of carrying out bridge static load test under traffic excitation, taking the Longshan bridge,a skew simply supported hollow slab bridge, as the study object, the calculation accuracy of applying static load test based on modal deflection method to the bearing capacity evaluation of skew slab bridge was studied. Firstly, the modal parameters of the bridge under the operation state were obtained by using environmental excitation. Then the modal shapes of the bridge were normalized by using the additional mass method, and the displacement compliance matrix of the bridge was calculated. Finally the modal deflection of the bridge was calculated by using the displacement compliance matrix and the equivalent load distribution method. The finite element beam lattice calculation model of Longshan bridge was established. According to the load test method, two loading conditions of static load test and eccentric load were designed. The displacement flexibility matrix was calculated by using the first fifth modal parameters of Longshan bridge. The modal deflections of each control section of the bridge under the two loading conditions were predicted, and compared with the calculated deflection of the finite element model and measured deflection. The results show that, compared with the calculated deflection, the error of the medium load condition is less than 5% and the maximum calculation error of the control section is 3.55%. Compared with the calculated deflection, the error of the partial load condition is less than 6%, and the maximum error of the control section is 5.15%, which can meet the engineering precision requirements. The modal deflection can effectively replace the measured static deflection of bridge static load test,and it is effective and feasible to use modal deflection to evaluate bridge bearing capacity.

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Last Update: 2020-06-08