Repairing Distortion-Induced Fatigue Cracks in Steel Bridge Girders Using Angles-with-Plate Retrofit Technique. I: Physical Simulations

Alemdar, Fatih; Nagati, Daniel; Matamoros, Adolfo; Bennett, Caroline; Rolfe, ST

doi:10.1061/(asce)st.1943-541x.0000876

Cited by 12 publications

(5 citation statements)

References 3 publications

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“…A vertical upward cyclic loading was applied to the far end of the crossframe by a servo-controlled hydraulic actuator, representing differential girder displacement and causing the girder to be loaded out-of-plane, producing DIF cracking in the web-gap region. Additional details regarding the DIF test frame can be found in Alemdar et al, 32 Al-Salih et al, 30,33,34 and Dellenbaugh et al 29…”

Section: Girder Test Setupmentioning

confidence: 99%

Application of a digital image correlation bridge inspection methodology on geometrically complex bifurcated distortion‐induced fatigue cracking

Al‐Salih

Juno

Collins

et al. 2021

Fatigue Fract Eng Mat Struct

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Distortion-induced fatigue cracking is a concern for many aging steel bridges in the United States. Human visual inspections to characterize fatigue cracks have many drawbacks including inconsistencies in identification, significant time and monetary costs, and safety risks posed to the lives of both inspectors and the traveling public due to lane closures. Digital image correlation (DIC) is a vision-based technology which has shown promise for identifying and characterizing fatigue cracks. Three-dimensional DIC measurements can capture full-field displacements and strains, allowing for detection and characterization of both in-plane and distortion-induced fatigue cracks. This paper describes an experimental study in which a half-scale steel girder to crossframe subassembly was subjected to distortion-induced fatigue loading to produce multiple geometrically complex cracks. A DIC-based crack characterization methodology was applied to quantify the cracks, which was successful at characterizing cracks propagating in the girder web but struggled to characterize horizontal cracks. Additional work is needed to improve the accuracy of the DIC-based crack characterization methodology to use as an automated bridge inspection tool.

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Section: Girder Test Setupmentioning

confidence: 99%

Application of a digital image correlation bridge inspection methodology on geometrically complex bifurcated distortion‐induced fatigue cracking

Al‐Salih

Juno

Collins

et al. 2021

Fatigue Fract Eng Mat Struct

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“…The study concluded that the stress fields at the web-gap region of the subassembly FE models were similar to the ones extracted from the global bridge FE models. Similar type of subassembly was adopted in the experimental studies in [35] as well.…”

Section: Description Of the Test Set-upmentioning

confidence: 99%

Sensing distortion-induced fatigue cracks in steel bridges with capacitive skin sensor arrays

Kong

Collins

et al. 2018

Smart Mater. Struct.

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Distortion-induced fatigue cracks represent the majority of fatigue cracks in steel bridges in the United States. Currently, bridge owners, such as the state departments of transportation (DOTs), rely on human inspection to detect, monitor, and quantify these cracks so that appropriate repairs can be applied before cracks reach critical sizes. However, visual inspections are costly, labor intensive, and may be prone to error due to inconsistent skills among bridge inspectors. In this study, we represent a novel strain-based approach for sensing distortion-induced fatigue cracks in steel bridges using soft elastomeric capacitor (SEC) arrays. Compared with traditional foil strain gauges, the SEC technology is a large-area and flexible skin-type strain sensor that can measure a wide range of strain over a large surface. Previous investigations have verified the suitability of a single SEC for sensing an in-plane fatigue crack in a small-scale steel specimen. In this paper, we further demonstrate the ability of SECs for sensing distortion-induced fatigue cracks. The proposed strategy consists of deploying an array of SECs to cover a large fatigue-susceptible region and establishing a fatigue sensing algorithm by constructing a crack growth index (CGI) map. The effectiveness of the strategy was experimentally validated through fatigue tests of bridge girder to cross-frame connection models with distortion-induced fatigue cracks. Test results verified that by deploying an SEC array, multiple CGIs can be obtained over the fatigue-susceptible region, offering a more comprehensive picture of fatigue damage. Furthermore, by monitoring a series of CGI maps constructed under different fatigue cycles, the fatigue crack growth can be clearly visualized through the intensity change in the CGI maps.

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“…These bridges have been in service for about 10-20 years. With the growth of the service time, the structural materials inevitably suffer from damage, including fatigue failure of expansion joint [3], cracks on concrete towers and piers [4], crack propagation in steel structures [5] and corrosion of cable wires [6]. The deterioration of material and structural performance brings potential risks to systemic safety and may cause serious accidents, especially under extreme weather or earthquakes [7].…”

Section: Introductionmentioning

confidence: 99%

Service performance evaluation of long-span cable-stayed bridge based on health monitoring data

Zhang¹,

Wang²,

Wang³

et al. 2022

J. vibroeng.

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Service performance evaluation is of great significance to the safety, durability, and reliability of bridge engineering. Over the last decade, structural health monitoring (SHM) systems have been widely used for condition monitoring of cable-stayed bridges, massive monitoring data are measured and stored by the sensing subsystems, which provides the basis for service performance evaluation of bridge engineering. Meanwhile, the load test is a common method to assess the construction and service performance of bridges. Combined the SHM systems and a load test of a thousand-meter level cable-stayed bridge after ten years of service, this paper investigates the operating conditions of main structures, including bridge towers, main girders, and steel cables. 52 trucks were used to conduct a quasi-static load on three key sections of bridges. Meanwhile, the GPS displacement of towers and main girders, stress of the main girders and acceleration responses of cables were measured synchronously by the SHM systems. Based on the health monitoring data, the dynamic responses, structural deformation, and cable tension of the bridge were investigated and evaluated by comparing with the finite element (FE) model load test at construction stage. The results show that the service performance of the bridge is basically within the designed conditions.

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Repairing Distortion-Induced Fatigue Cracks in Steel Bridge Girders Using Angles-with-Plate Retrofit Technique. I: Physical Simulations

Cited by 12 publications

References 3 publications

Application of a digital image correlation bridge inspection methodology on geometrically complex bifurcated distortion‐induced fatigue cracking

Application of a digital image correlation bridge inspection methodology on geometrically complex bifurcated distortion‐induced fatigue cracking

Sensing distortion-induced fatigue cracks in steel bridges with capacitive skin sensor arrays

Service performance evaluation of long-span cable-stayed bridge based on health monitoring data

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