|Table of Contents|

Field Test and Analysis on Impact Factor Spectrum of Vehicle for Continuous Bridge Under Random Traffic Flow(PDF)

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

Issue:
2012年03期
Page:
31-39
Research Field:
Publishing date:

Info

Title:
Field Test and Analysis on Impact Factor Spectrum of Vehicle for Continuous Bridge Under Random Traffic Flow
Author(s):
LI Yan-wei1; 2;  DU Qun-le3;  HAN Wan-shui4;  QIAO Lei4
1. School of Management, Tianjin University, Tianjin 300072, China; 2. Shijiazhuang Traffic Transport Bureau, Shijiazhuang 050051, Hebei, China; 3. Hebei Highway Administration Bureau, Shijiazhuang 050051, Hebei, China; 4. School of Highway, Chang'an Un
Keywords:
continuous bridge;  impact factor spectrum;  random traffic flow;  low pass Butterworth filter;  extreme-Ⅰtype distribution
PACS:
U448.21
DOI:
-
Abstract:
Field test and analysis were carried out for dynamic responses on a continuous bridge under open traffic. The inspection, testing and analysis for the tested bridge mainly consisted of the measurement of pavement roughness and analysis on power spectral density, the testing and analysis on natural vibration characteristics, the observation of traffic loads under open traffic and the corresponding measurements of dynamic displacement and acceleration on bridge. To determine impact factors in terms of measured dynamic displacement responses, low pass Butterworth filter was used for filtering the dynamic part of measured dynamic displacement and the static extreme values were reserved. In addition, the relations between impact factors and vehicle weights, vehicle speeds were studied, the distribution fit test was performed using K-S methodology for measured impact factors according to extreme-Ⅰtype respectively. Finally, the impact factor of this bridge, which was determined by statistical method, was compared with code-specified impact factors of different countries. The results show that impact factor tends to decrease with increasing vehicle weight,and the impact factor increases gradually as the vehicle speed is increased within a wide range, moreover, the measured impact factor spectrum follows extreme-Ⅰtype basically, the impact factor determined by statistical method is smaller than code-specified impact factors of many countries.

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Last Update: 2012-09-20