scholarly journals Single and multiple presence statistics for bridge live load based on weigh-in-motion data

2017 ◽  
Vol 10 (6) ◽  
pp. 1163-1173 ◽  
Author(s):  
E. L. PORTELA ◽  
R. M. TEIXEIRA ◽  
T. N. BITTENCOURT ◽  
H. NASSIF
Keyword(s):  
High Speed ◽  
Daily Basis ◽  
Concrete Bridges ◽  
General Tendency ◽  
Live Load ◽  
Motion Data ◽  
Load Models ◽  
Weigh In Motion ◽  
Live Load Model ◽  
Bridge Spans

Abstract Modeling the traffic loads on bridges has been the subject of numerous studies. Defining a live load model to be used for bridge design is not an easy task. It demands among many other things a reliable dataset, a well-defined procedure for filtering data and also the determination of statistics for single and multiple presence occurrences. This study examines and characterizes the live load statistics for Brazilian concrete bridges. Single and multiple truck presence are evaluated for different bridge spans and truck daily volume. The sample is comprised of the thirteen months of data from a High Speed Weigh-In-Motion station (HS-WIM) in a resolution of one hundredth of a second currently operating on the Fernão Dias highway, also known as BR-381. The system provides eleven thousand records on a daily basis. After the filtering process three thousand trucks remain. The station takes measures in an same-direction two-lane highway, which allows the evaluation and characterization of both single and multiple presence statistics. Three case of multiple presence are considered: following, side-by-side and staggered cases. The consideration of truck multiple presence on concrete bridges is mandatory to understand and characterize live load models. The results show that with the exception of the side-by-side case, the frequency of multiple truck presence is significantly affected by span length. It also shows that the daily truck volume considerably affects the multiple presence statistics for all load patterns. The results show that the general tendency of the occurrence of all multiple presence events is to increase as the truck volume increases.

Probabilistic assessment of live load effects on continuous span bridges with regular and irregular configurations and its design implications

2020 ◽  
Vol 47 (4) ◽  
pp. 405-417
Author(s):  
A.D. García-Soto ◽  
A. Hernández-Martínez ◽  
J.G. Valdés-Vázquez
Keyword(s):  
Probabilistic Assessment ◽  
Live Load ◽  
Load Model ◽  
Motion Data ◽  
Load Models ◽  
Weigh In Motion ◽  
Single Vehicle ◽  
Load Effects ◽  
Extreme Distribution ◽  
Live Load Model

Studies on live load effects reported in recent literature are based on simple span bridges or on a limited number of continuous span bridges and regular configurations. In this study, an extensive probabilistic assessment of live load effects on continuous bridges is carried out for regular and irregular span configurations using weigh-in-motion data. Single vehicle passage is considered, and live load effects are compared with those from a live load model developed for simple spans from the same database. Truck models from Canada are also used for comparison purposes. Discussion of the fitting of extreme distribution is included, and an optimization scheme for the fitting is proposed. The most important finding of the study is that the use of live load models developed from simple spans or a limited number of continuous spans may not be suitable for designing continuous bridges, especially those with irregular configurations and short spans.

Reliability-Based Site-Specific Live Load Models for the Gordie Howe International Bridge

2019 ◽  
Author(s):  
Todd Ude ◽  
Y. Eddie He ◽  
Matt Chynoweth ◽  
Zaher Yousif
Keyword(s):  
Live Load ◽  
Simulation Studies ◽  
Traffic Patterns ◽  
Limit States ◽  
Site Specific ◽  
Motion Data ◽  
Load Models ◽  
Design Life ◽  
Weigh In Motion ◽  
Large Databases

<p>This paper discusses the development of project-specific live load models to achieve target reliability levels for the Gordie Howe International Bridge. This new bridge between Windsor, Ontario Canada and Detroit, Michigan USA will have a main span of 853 m (2800 ft), a design life of 125 years, and will experience atypical traffic patterns as a result of customs inspection plazas required at both ends of the bridge. Due to these variations relative to standard practice, large databases of weigh-in-motion data and simulation studies were used to modify the live load models of both country’s codes following the approach of NCHRP 683. The limit states addressed extend beyond the Strength 1 (ULS 1), to include high dead-to-live ratio combinations, and fatigue limit states.</p>

Statistical Investigation of Design Live Load by Applying WIM Data with Different Degree of Compliance with Truck Weight Limit

2018 ◽  
Author(s):  
Inyeol Paik ◽  
Kilhwan Jeong
Keyword(s):  
Measurement Data ◽  
Statistical Investigation ◽  
Live Load ◽  
Overload Control ◽  
Safety Level ◽  
Motion Data ◽  
Weigh In Motion ◽  
Single Vehicle ◽  
Live Load Model ◽  
Truck Weight

<p>The live load model applied to the design of the bridge should be defined so that a target safety level can be secured in the actual traffic environment. In this paper, it is presented that the live load could be greatly affected by the measurement data used for the statistical estimation process. For this purpose, a statistical analysis is performed on WIM (weigh-in-motion) data measured during different periods in terms of the overload control at the same spot of an expressway in Korea. The effects by a single vehicle, the back-to-back series vehicles and the side-by-side parallel vehicles are obtained and compared.</p>

scholarly journals Importance of the traffic model in the reliability estimation of highway bridges

2019 ◽  
Vol 281 ◽  
pp. 01003
Author(s):  
Fatima El Hajj Chehade ◽  
Rafic Younes ◽  
Fadi Hage Chehade ◽  
Hussein Mroueh
Keyword(s):  
Highway Bridges ◽  
Concrete Bridges ◽  
Reliability Estimation ◽  
Assessment Process ◽  
Reliability Indices ◽  
Load Models ◽  
Reinforced Concrete Bridges ◽  
Knowing That ◽  
Vehicle Data ◽  
Weigh In Motion

Road bridges are exposed to stochastic traffic loadings that are not simply determined. The international codes for the design and assessment of highway bridges provide some standard trucks that can be used in the design process. Knowing that the traffic can vary considerably from one bridge to another, standard trucks may lead to poorly estimate the reliability in the assessment process. So, the sensitivity of the reliability indices to the load models will be discussed, on one hand by considering the standard truck given by the French Fascicule 61 and on the other hand by adopting real vehicle data from existing weigh-in-motion station. A set of reinforced concrete bridges will be used for the application.

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