scholarly journals Evaluating Reserve Strength of Girder Bridges Due to Bridge Rail Load Shedding

2021 ◽  
Author(s):  
Yao Wang ◽  
Mirela D. Tumbeva ◽  
Ashley P. Thrall
Keyword(s):  
Prestressed Concrete ◽  
Numerical Models ◽  
Field Testing ◽  
Load Shedding ◽  
Steel Girder ◽  
Girder Bridges ◽  
Steel Girder Bridges ◽  
Girder Bridge ◽  
Prestressed Concrete Girder Bridge ◽  
Reserve Strength

This research experimentally and numerically evaluated the reserve strength of girder bridges due to bridge rail load shedding. The investigation included: (1) performing non-destructive field testing on two steel girder bridges and one prestressed concrete girder bridge, (2) developing validated finite element numerical models, and (3) performing parametric numerical investigations using the validated numerical modeling approach. Measured data indicated that intact, integral, reinforced concrete rails participate in carrying live load. Research results culminated in recommendations to evaluate the reserve strength of girder bridges due to the participation of the rail, as well as recommendations for bridge inspectors for evaluating steel girder bridges subjected to vehicular collision.

Dynamic behavior of aluminum deck-on-steel girder bridges under vehicular traffic loads considering the effect of road roughness

2021 ◽  
Author(s):  
Achraf Ben Afia ◽  
Charles-Darwin Annan ◽  
Pampa Dey
Keyword(s):  
Dynamic Behaviour ◽  
Numerical Models ◽  
Highway Bridges ◽  
Vehicular Traffic ◽  
Steel Girder ◽  
Dynamic Design ◽  
Girder Bridges ◽  
Steel Girder Bridges ◽  
Road Roughness ◽  
Dynamic Amplification

<p>Aluminium as a structural material is known for its lightweight, which facilitates easy transportation and installation, and reduces foundation requirements. However, this lightweight characteristic makes it sensitive to excitations from vehicular traffic leading to dominating dynamic design over the static one. The dynamic design of highway bridges by the Canadian Highway Bridge Design Code (CSA S6-19) is based on the concept of equivalent dynamic amplification factors (DAF), which were derived largely based on the observations from bridges constructed with traditional materials such as concrete, wood and steel. It is prudent to evaluate whether these factors are applicable to lightweight bridges made with extruded aluminium decks. In addition, since road roughness plays an important role in the dynamic behaviour of a bridge, it is important to consider the influence of roughness on the bridge vibration response. The objective of this research is to investigate the dynamic behaviour of aluminium deck-on-steel girder bridges under vehicular loads considering the effect of road roughness, and consequently evaluate the applicability of the current design DAFs for such structures. For this purpose, numerical models have been developed in Abaqus for a range of selected bridge configurations and loading parameters and subsequently the key observations and conclusions from the numerical analysis have been presented in this paper.</p>

Experimental Investigation on the Fatigue Strength of the Replacement Repair Welded Joints

2007 ◽  
Vol 345-346 ◽  
pp. 355-358
Author(s):  
Kyong Ho Chang ◽  
H.C. Park ◽  
Chin Hyung Lee ◽  
Gab Chul Jang ◽  
E.H. Choi
Keyword(s):  
Fatigue Strength ◽  
Welded Joints ◽  
Steel Plate ◽  
Fatigue Tests ◽  
Steel Plates ◽  
Steel Girder ◽  
Girder Bridges ◽  
Steel Girder Bridges ◽  
Flux Cored Arc Welding ◽  
Girder Bridge

In recent years, the replacement repair welding, which repairs damaged steel girder bridges by replacement of the damaged sections with new steel plates through cutting and welding under in-service conditions, is spotlighted for its brilliant features, i.e. it can be achieved without incurring traffic dislocation. However, the mechanical behavior of the welded joints under cyclic loads due to the traffic which passes along the girder bridges is not clarified. In this paper, the fatigue strength of the replacement repair welded joints was investigated in order to improve reliability in the repair welded joints. Steel plate was extracted from the old steel girder bridge; then was welded with new steel plate to construct specimen with the replacement repair welded joints. Flux Cored Arc Welding (FCAW) process was used to fabricate the double "V" butt joints. Fatigue tests were conducted using a servo hydraulic controlled 50tonf capacity UTM with a frequency of 5Hz under constant amplitude loading. The fatigue strength of the replacement repair welded joints was analyzed in detail.

Fatigue strength of prestressed concrete girder bridges

1988 ◽  
Vol 15 (2) ◽  
pp. 199-205 ◽  
Author(s):  
Rajeh Z. Al-Zaid ◽  
Andrzej S. Nowak
Keyword(s):  
Fatigue Life ◽  
Prestressed Concrete ◽  
Structural Reliability ◽  
Experimental Studies ◽  
Probabilistic Methods ◽  
Fatigue Properties ◽  
Girder Bridges ◽  
Girder Bridge ◽  
Prestressed Concrete Girder Bridge ◽  
Concrete Girder

A model for evaluating the fatigue life of a prestressed concrete girder bridge is presented. Experimental studies indicate that fatigue is a random phenomenon. Therefore, the approach is based on probabilistic methods. The fatigue life of the prestressed concrete girder is estimated from the fatigue properties of its components, namely, the cast-in-place slab, precast beam, prestressing steel, and, if partially prestressed, the tension reinforcement. The model utilizes the available S–N curves for structural materials and Miner's rule to evaluate the fatigue life under variable amplitude loading. A model for determining the distribution function of time to first cracking is also presented. To demonstrate the developed models, a typical prestressed concrete girder bridge is analyzed. On the basis of this investigation, it is concluded that fatigue in prestressed concrete girder bridges designed according to the American Association of State Highway and Transportation Officials specifications is not a limiting design criterion. Key words: bridges, fatigue, prestressed concrete, structural reliability.

Seismic Performance Research of Steel Girder Bridge with Isolation Bearings and Restrainer Cables

2013 ◽  
Vol 353-356 ◽  
pp. 2000-2003
Author(s):  
Peng Zhang ◽  
Cui Ping Pang ◽  
Min Yuan ◽  
Wan Wen Wang
Keyword(s):  
Seismic Performance ◽  
Seismic Isolation ◽  
Steel Girder ◽  
Girder Bridges ◽  
Steel Girder Bridges ◽  
Lead Rubber Bearings ◽  
Steel Girder Bridge ◽  
Girder Bridge ◽  
Rubber Bearings ◽  
Existing Bridges

The seismic performance of multi-span simply supported steel-girder bridges with sliding and high rocker steel bearings is poor during earthquakes. During the past 20 years, seismic isolation has emerged as one of the most promising strategy for improving the seismic performance of existing bridges. In this study elastomeric bearings, lead-rubber bearings, and cable restrainers are attempted to modify the seismic response of bridges, and theirs effects are analyzed and compared.

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.

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