scholarly journals Significance of Fatigue Damage from Overload Trucks on Bridge Load Rating

2018 ◽  
Vol 165 ◽  
pp. 10005 ◽  
Author(s):  
Bora Jang ◽  
Jamshid Mohammadi
Keyword(s):  
Service Life ◽  
Fatigue Damage ◽  
The United States ◽  
Load Rating ◽  
Steel Girder ◽  
Girder Bridges ◽  
Steel Girder Bridges ◽  
Critical Components ◽  
Truck Load ◽  
The Impact

Overload trucks constitute a major portion of truck load populations on highways. Specific to bridges, the increase in the frequency of overloads may trigger shortening of service life of critical components because of fatigue damage, considering the fact that fatigue damage accelerates at higher loads. This is especially important to older bridges that have been designed for loads lower than the standard for current highway bridge design in the United States. As the number of requests for special permits to use bridges by overload trucks increases, the accumulated damage may substantially reduce the service life of bridges resulting in costly repair and replacements. In this paper, the significance of overloads in causing fatigue damage to bridges is discussed. Samples of truck load data have been compiled and used to determine the contribution of overloads to fatigue damage for steel girder bridges made up of welded cover plates. The paper discusses using the expected fatigue life expended (FLE) as an index to determine the impact of overloads on bridge fatigue damage. The FLE is then determined to be an important factor that can be used to modify bridge rating equations as a way of controlling the number of overload permits for a given bridge.

scholarly journals Repair of fatigue damage in cross bracing connections in steel girder bridges.

1989 ◽  
pp. 53-61 ◽  
Author(s):  
Chitoshi MIKI ◽  
Hiroyuki TAKENOUCHI ◽  
Takeshi MORI ◽  
Seiji OHKAWA
Keyword(s):  
Fatigue Damage ◽  
Steel Girder ◽  
Girder Bridges ◽  
Steel Girder Bridges

RESPONSE OF COMPOSITE STEEL PLATE GIRDER BRIDGES SUBJECTED TO DEBRIS FIRES

2018 ◽  
Vol 5 (2) ◽  
Author(s):  
Amila Dissanayake ◽  
Srikanth Venkatesan ◽  
Sujeeva Setunge
Keyword(s):  
Research Work ◽  
Mechanical Analysis ◽  
Design Stage ◽  
Steel Girder ◽  
Girder Bridges ◽  
Modelling Framework ◽  
Steel Girder Bridges ◽  
Significant Damage ◽  
Prolonged Duration ◽  
The Impact

Bridge fires have been a serious concern for asset owners for decades. Considerable research work has been published on the assessment of bridges subjected to hydrocarbon fires and Wildland Urban Interfaces (WUI) fires like bushfires. However, the impact from fires that may have been generated due to onsite-accumulated debris, has been largely overlooked in the past. Prolonged duration of debris fires might well cause significant damage to the bridges, unless properly accounted during the design stage. The current study investigates the influence from debris-generated fires on steel girder bridges, using a reasonably validated advanced numerical modelling framework. Fire development was modelled first as a static, and then a travelling fire, using fire dynamic simulation (FDS) to capture the Adiabatic Surface Temperature (AST) development of the structure. The resulted AST was coupled with thermo-mechanical analysis using sequentially coupled thermo-mechanical analysis procedure in ABAQUS. The numerical model was used to estimate the temperature and displacement development of the bridge. The outcome from the study will facilitate asset managers for conducting necessary risk assessments incorporating the influence of onsite flammable debris for bridges.

Truck Platooning to Minimize Load-Induced Fatigue in Steel Girder Bridges

2020 ◽  
pp. 036119812097365
Author(s):  
Thales Couto Braguim ◽  
Peng Lou ◽  
Hani Nassif
Keyword(s):  
Fatigue Damage ◽  
Energy Savings ◽  
Steel Girder ◽  
Girder Bridges ◽  
Remaining Service Life ◽  
State Highway ◽  
Steel Girder Bridges ◽  
Number Of Cycles ◽  
Load And Resistance Factor ◽  
Rainflow Counting

Truck platooning has been demonstrated to possess several advantages in relation to energy savings. To implement this technology in the future, a better understanding of the effects of truck platooning on bridges is needed in relation to safety, serviceability, and remaining service life. This research aims at investigating the effects of truck platooning on the fatigue of steel girder bridges. Different types of platoons are simulated in line girder analysis for simple spans and two-equal continuous spans bridges. Then the rainflow counting method is applied to obtain the stress ranges and cycles. Miner’s rule is used to quantify the fatigue damage. The fatigue damage of different platoons is normalized by American Association of State Highway Transportation Officials Load and Resistance Factor Design Fatigue Load for comparison. The effects of the number of trucks and gap distances of truck platoons are further investigated. In some cases, truck platooning helps decrease the fatigue damage since, although truck platooning brings higher load effects, it also decreases the number of cycles. For platoons with different truck wheelbases, there are specific span to wheelbase ratios, beyond which fatigue damage decreases as gap distance increases. In addition, depending on the platoon configurations, there are ranges of span lengths where it is more beneficial to travel as truck platoons rather than traveling individually in relation to fatigue damage.

scholarly journals Effect of Cross-Frames on Load Distribution of Steel Bridges with Fractured Girder

2020 ◽  
Vol 5 (4) ◽  
pp. 32 ◽  
Author(s):  
Mohammad Abedin ◽  
Armin B. Mehrabi
Keyword(s):  
Load Distribution ◽  
Steel Plate ◽  
Steel Girder ◽  
Girder Bridges ◽  
Steel Girder Bridges ◽  
Solution Methods ◽  
Profile Changes ◽  
Girder Bridge ◽  
The Impact ◽  
Sudden Collapse

In steel girder bridges, fracture of one girder may occur without noticeable bridge profile changes. It is critical to ensure that the bridge will have adequate capacity to prevent collapse until the next cycle of inspection discovers the damage. It is realized that once one of the bridge girders is fractured, vertical loads need to be distributed through an alternative path to the intact girder(s). In this case, cross-frames can play an important role in transferring the loads and preventing from sudden collapse. This paper investigates the impact of cross-frames on load distribution after a fracture is occurred in one girder. Bridge configurations with different cross-frame spacing were studied using finite element modeling and simulation of the bridge behavior with a fractured steel plate girder. Nonlinear and dynamic solution methods were used for these analyses. Results of this investigation demonstrated the important role cross-frames can play in providing some reserved capacity for the bridge with fractured girder to enhance the bridge redundancy. The contribution of the cross-frames and the behavior of the bridge after fracture in one girder however depends on the configuration of the bridge. A study of the variation of the effect of cross-frames with respect to the number of girders is also included in this paper.

Evaluation and Load Rating of a Steel Girder In-Span Hinge Connection

2021 ◽  
pp. 036119812110578
Author(s):  
Sofia Puerto Tchemodanova ◽  
Daniel Baxter ◽  
Shayla Olson
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Steel Plate ◽  
Element Model ◽  
Load Rating ◽  
Steel Girder ◽  
Expansion Joints ◽  
Girder Bridges ◽  
Steel Girder Bridges ◽  
The Moment

Continuous steel plate girder bridges often use intermediate expansion joints located at in-span hinges to divide the superstructure into individual units with shorter expansion lengths. One common type of in-span hinge is often termed a “shiplap joint.” This type of joint is located away from piers near the moment inflection point of the span, maximizing girder efficiency. It consists of a cantilevered portion of the superstructure supporting a suspended portion of the latter on bearings placed on dapped portions of the steel plate girders. Few references are available for the evaluation and load rating of shiplap in-span hinges used in steel girder bridges. In this study, the strength and stability of a typical shiplap hinge connection is evaluated using two methodologies: a 3D finite element model including a detailed mesh of the connection; and a proposed simplified methodology based on design equations. Load ratings of the connections based on these methodologies are compared. The proposed approach allows for a conservative assessment of the hinge without the need for a detailed finite element model.

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