This paper proposes an algorithm for the estimation of extreme intensity of traffic load on long-span bridges. Most Weigh-in-Motion technologies do not operate in congested conditions which are the governing cases for these bridges. In the absence of Weigh-in-Motion data on the bridge itself, a correlation between vehicle weights and their lengths is established here using a (free- flowing) Weigh-in-Motion database. Photographic images of congested traffic are modelled here for three bridges using weights estimated from lengths and one year of Weigh-in-Motion data. The actual weights are taken from the Weigh-in- Motion data, and the results are compared to test the method. The gaps between vehicles are firstly set to a constant value and later to Beta-distributed values according to vehicle type. The intensity of traffic load for all pictures is calculated and compared to the loads obtained from the recorded weights. A return period of 75-year is chosen to evaluate the extreme values of intensity. The probability that intensity of load is being exceeded is obtained using normal probability paper for both recorded and simulated weights. This study demonstrates the feasibility of the proposed concept of using lengths to estimate the extreme traffic load events with acceptable accuracy.
Estimation of Extreme Load Effects on Long-Span Bridges Using Traffic Image Data
2018-12-21
doi:10.7250/bjrbe.2018-13.427
The Baltic Journal of Road and Bridge Engineering; Vol 13, No 4 (2018): The Baltic Journal of Road and Bridge Engineering; 429-446 ; 1822-4288 ; 1822-427X
Article (Journal)
Electronic Resource
English
DDC: | 629 |
Vehicle Load Effect of Long-Span Bridges
Online Contents | 2015
|Vehicle Load Effect of Long-Span Bridges
Transportation Research Record | 2015
|Vehicle Load Spectrum Simulation of Long-Span Bridges
Trans Tech Publications | 2015
|Study on Gust Response Estimation of Long-span Bridges
TIBKAT | 1990
|Long and short span railway bridges
TIBKAT | 1869
|