|Table of Contents|

Theoretical back-calculation method for differential settlement of bridge-subgrade transition section based on vehicle vibration acceleration(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2025年5期
Page:
1-14
Research Field:
道路工程
Publishing date:

Info

Title:
Theoretical back-calculation method for differential settlement of bridge-subgrade transition section based on vehicle vibration acceleration
Author(s):
ZHANG Hong-liang1;  WANG Xiao-feng1;  LYU Wen-jiang2;  TANG Zu-jie3
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Shaanxi Transportation Holding Group Co., Ltd., Xi'an 710075, Shaanxi, China; 3. Transportation Construction Quality and Safety Center of Fujian Province, Fuzhou 350001, Fujian, China)
Keywords:
road engineering;  vehicle bump at bridgehead;  vibration acceleration;  differential settlement;  Laplace transform
PACS:
U416.1
DOI:
10.19721/j.cnki.1671-8879.2025.05.001
Abstract:
To meet the requirement for rapid detection of differential settlement of bridge-subgrade transition section, a theoretical back-calculation method was proposed based on vehicle vibration acceleration. A quarter-vehicle model was constructed, a step-like model and a broken-line model were established for bridge-subgrade transition sections with and without approach slab, respectively. According to Newton's second law, the forced vibration equation of a vehicle passing through the bridge-subgrade transition section was derived, and the Laplace transform was used to transfer the equation into a homogeneous equation for solving. Thus, a theoretical relationship between vehicle vibration acceleration and differential settlement of bridge-subgrade transition section was established in frequency domain. Considering the influence of vehicle driving direction on vibration responses, the vehicle passing through the bridge-subgrade transition section was divided into entry onto the bridge and egress from the bridge. The initial conditions and pavement displacements when the vehicle passing through the bridge-subgrade transition sections with and without approach slab were established, respectively. Vehicle drop tests were conducted to develop a correlative framework between modal parameters and physical parameters of the vehicle based on the modal parameter theory. Furthermore, the genetic algorithm was used to determine the physical parameters of the vehicle. On this basis, a theoretical back-calculation method for differential settlement of the bridge-subgrade transition section based on vehicle vibration acceleration was established and field-verified. The research results show that the error between the theoretically back-calculated differential settlement of the bridge-subgrade transition section using the vehicle vibration acceleration and the measured value is less than 0.25 cm. The minimum error rate is 6.00%, the maximum error rate is 13.16%, and the average error rate is 8.89%. So the relative error rate is less than 14%. The error primarily stems from the simplification in dynamic process when the vehicle tire contact areas are large, the superimposed excitation from uneven pavement before the step, and the vehicle parameter identification accuracy. The proposed method is applicable to bridge-subgrade transition sections both with and without approach slab, with the only difference being the road excitation imposed on the vehicle when passing through the bridgehead. It can be used to detect the differential settlement of the bridge-subgrade transition section.4 tabs, 9 figs, 30 refs.

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Last Update: 2025-09-30