Steel bridge deterioration data in Japan and modelling

Tamakoshi, Takashi; Shirato, Masahiro; Kamada, Takenobu

doi:10.1680/jbren.16.00004

Cited by 3 publications

(3 citation statements)

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“…The deterioration of bridges [1] [2] and buildings [3] is a problem; hence, regular inspections are manually conducted. However, in addition to the enormous cost and time required, these inspections involve risks for the inspector.…”

Section: Instructionsmentioning

confidence: 99%

Investigation of Rotors Imitating Bird Wings to Reduce Electricity Consumption of HORNET

et al. 2019

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To address the deterioration of bridges and buildings, we have developed a robot, HORNET, to inspect building walls. This robot travels on the wall surface using propellers with wheels on the wall. As the running duration is short on smooth surfaces, the crosssectional shape of the rotor was designed to reduce the power consumption using two-dimensional numerical analysis using a genetic algorithm. Furthermore, we manufactured several kinds of rotors imitating birds and performed experiments to determine the ideal shape to reduce electricity consumption. Experiments were also conducted to evaluate the performance when the rotor was attached to HORNET. First, we developed HORNET's dynamic model and evaluated the performance by running a simulation on a route imitating the actual inspection route. Additionally, by installing a new rotor in HORNET, we evaluated the running performance on the up and down paths.

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Section: Instructionsmentioning

confidence: 99%

Investigation of Rotors Imitating Bird Wings to Reduce Electricity Consumption of HORNET

et al. 2019

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“…The authors conducted a series of static and dynamic tests on the bridge, deploying various technologies and used the findings to improve and validate their numerical model. We can even learn how an ordinary smartphone, one that almost all of us carry around these days, can be used as an instrument to measure the natural frequency of structures.A new procedure adopted to capture bridge condition data in Japan is described by Tamakoshi et al (2017). Japan, like other developed countries, has an extensive infrastructure.…”

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confidence: 99%

“…A new procedure adopted to capture bridge condition data in Japan is described by Tamakoshi et al (2017). Japan, like other developed countries, has an extensive infrastructure.…”

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confidence: 99%

Editorial

Takács

2017

Proceedings of the Institution of Civil Engineers - Bridge Engi

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I think that many of us chose a career in engineering because we like solving technical problems, and we like solving technical problems by experimenting and finding solutions that are better than the ones we have used before. 'Better', in this context, could mean many things; longer, taller, slenderer, stronger, more durable, less disruptive, better looking, more economical, safer, more sustainable. This intrinsic drive to innovate is of course not just a self-serving demonstration of engineering prowess and flair. The demand for improved infrastructure and the ever-increasing expectations from society require engineers to remain innovative, challenge traditional thinking and go beyond established practices.This issue of Bridge Engineering contains five interesting papers. They cover newly built and existing bridges and general asset management but innovation is a common element to all. They demonstrate how innovative thinking can enhance our solutions and lead ultimately to delivering better value to our clients and society; be that producing a more efficient design, finding hidden reserves of strength in an aging bridge or optimising the maintenance spend across a network of structures. The five papers are from Sweden, the UK, Ireland, Japan and China. It is welcome to see papers from different countries. This is testament to the wide international appeal of Bridge Engineering and the standing of the journal among practising and research engineers worldwide.In the first paper, Häggström et al. (2017) describe the full-scale testing of an old steel truss railway bridge to failure. It is not often that bridge engineers have the opportunity to test a real bridge to destruction and witness its behaviour near and at failure. Besides the obvious thrill from the exercise, such tests can provide valuable insight into the behaviour of a real structure, its actual ultimate capacity and failure mechanisms. The findings can then be applied in the assessment of similar bridges. When the Åby Bridge in northern Sweden was replaced by a new bridge, it was placed on temporary supports alongside its original position and loaded to failure by two hydraulic jacks with cables anchored in bedrock. The authors describe the test and the accompanying numerical analysis, including comparison of the findings with a previous assessment to the Swedish assessment standard. Hendy et al. (2017) describe the design of Walton Bridge, a new arch road bridge over the River Thames. The two inclined steel arch ribs have a hexagonal cross-section and support the ladder deck on steel bar hangers. The paper provides a general overview of the design, followed by a more detailed account of two particular challenges that the designers had to tackle in order to produce a design that is both safe and efficient. The first issue relates to the section classification and resistance of the hexagonal shaped arch ribs that are made up of curved plates. The second issue relates to the fatigue and toughness properties of the steel bar hangers. The paper describe...

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Editorial

Addis

2018

Proceedings of the Institution of Civil Engineers - Engineering

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Steel bridge deterioration data in Japan and modelling

Cited by 3 publications

References 5 publications

Investigation of Rotors Imitating Bird Wings to Reduce Electricity Consumption of HORNET

Investigation of Rotors Imitating Bird Wings to Reduce Electricity Consumption of HORNET

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