Fracture Feature and Failure Cause Analysis of Cable Wire on Bridges

2012 ◽  
Vol 178-181 ◽  
pp. 2472-2478 ◽  
Author(s):  
Chu Han Deng
Keyword(s):  
Loading Condition ◽  
Steel Wire ◽  
High Strength ◽  
Light Weight ◽  
Steel Cable ◽  
Fracture Feature ◽  
Cause Analysis ◽  
Long Span Bridges ◽  
Long Span ◽  
Cable Wire

Cable wire is characterized by light weight and high strength and is widely applied in long span bridges. However, steel cable wire is vulnerable to fatigue and corrosion, which has been proved to be true through collapses of several bridges because of cable failure. This paper will the following 4 types of the fractures of steel wire: cone-shaped fracture, serrated fracture, cup-shaped fracture and step-like fracture to explore failure cause of cable wire. This paper also illustrates the fracture feature respectively and failure causes considering environmental and loading condition of cable.

Long-span bridges in Norway constructed in high-strength LWA concrete

1996 ◽  
Vol 18 (11) ◽  
pp. 845-849 ◽  
Author(s):  
K. Melby ◽  
E.A. Jordet ◽  
C. Hansvold
Keyword(s):  
High Strength ◽  
Long Span Bridges ◽  
Long Span

A Study on the Development of Slip Form System With Lightweight GFRP Panel

2013 ◽  
Author(s):  
Hyejin Yoon ◽  
Won Jong Chin ◽  
Hee Seok Kim ◽  
Young Jin Kim
Keyword(s):  
High Performance ◽  
High Strength ◽  
Suspension Bridges ◽  
Long Span Bridges ◽  
Long Span ◽  
Management Technology ◽  
Early Strength ◽  
Near Future ◽  
Form System ◽  
Design And Construction

Nowadays, many countries are competing in the erection of long-span bridges with main span longer than 2,000 m owing to the tremendous innovations realized in the domain of high performance and high strength materials as well as in the design and construction technologies. The near future will see a boom in the market of suspension bridges with main span longer than 3,000 m. Since three-dimensionally shaped high concrete pylons would be unavoidably required to construct these super long-span bridges, need is to develop advanced slip form systems for their erection. This paper presents the development of a slip form system applying lightweight GFRP panel. Improved slip form management technology is secured by introducing a slip-up technique using GPS-based verticality control and wireless early strength estimation. A mock-up test is conducted by designing and fabricating the slip form system based on the developed techniques.

Health monitoring of long span bridges and design verification with typhoon data

2019 ◽  
Author(s):  
Matt Carter ◽  
Naeem Hussain ◽  
Ngai Yeung ◽  
Steve Kite ◽  
K. W. Y. Chan ◽  
...  
Keyword(s):  
Hong Kong ◽  
Monitoring System ◽  
Health Monitoring ◽  
Loading Condition ◽  
Measurement Data ◽  
Wind Loading ◽  
Health Monitoring System ◽  
Long Span Bridges ◽  
Long Span ◽  
Bridge Responses

<p>Stonecutters Bridge is 1,018m main span cable stayed bridge in Hong Kong. The bridge incorporates a Wind and Structural Health Monitoring System (WASHMS) for monitoring the environmental loading condition such as traffic, temperature, wind and earthquake as well as the structural responses of the bridge including deflections, strains and long-term change of the bridge. A very powerful typhoon called Mangkhut, with 1- minute sustained wind speed up to 285km/h (180mph), struck Hong Kong on September 16, 2018. The response of Stonecutters Bridge under the action of this typhoon and the site-specific typhoon data have been recorded by the WASHMS. This paper analyses the measurement data of the typhoon loading and the bridge responses to demonstrate the use of health monitoring system for long span bridges and to verify the design of the bridge by comparison of the wind loading condition and stress conditions in major structural components.</p>

scholarly journals Magnetic Flux Leakage Sensing-Based Steel Cable NDE Technique

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Seunghee Park ◽  
Ju-Won Kim ◽  
Changgil Lee ◽  
Jong-Jae Lee
Keyword(s):  
Magnetic Flux ◽  
Magnetic Flux Leakage ◽  
Magnetic Flux Density ◽  
Inspection System ◽  
Steel Cable ◽  
Monitoring Method ◽  
Sensor Head ◽  
Long Span Bridges ◽  
Long Span ◽  
Flux Leakage

Nondestructive evaluation (NDE) of steel cables in long span bridges is necessary to prevent structural failure. Thus, an automated cable monitoring system is proposed that uses a suitable NDE technique and a cable-climbing robot. A magnetic flux leakage- (MFL-) based inspection system was applied to monitor the condition of cables. This inspection system measures magnetic flux to detect the local faults (LF) of steel cable. To verify the feasibility of the proposed damage detection technique, an 8-channel MFL sensor head prototype was designed and fabricated. A steel cable bunch specimen with several types of damage was fabricated and scanned by the MFL sensor head to measure the magnetic flux density of the specimen. To interpret the condition of the steel cable, magnetic flux signals were used to determine the locations of the flaws and the levels of damage. Measured signals from the damaged specimen were compared with thresholds that were set for objective decision-making. In addition, the measured magnetic flux signals were visualized as a 3D MFL map for intuitive cable monitoring. Finally, the results were compared with information on actual inflicted damages, to confirm the accuracy and effectiveness of the proposed cable monitoring method.

Microstructure of an extruded rapidly solidified Al-8Fe-2Mo alloy

1986 ◽  
Vol 44 ◽  
pp. 548-549
Author(s):  
W. T. Donlon ◽  
J. E. Allison ◽  
S. Shinozaki
Keyword(s):  
Electron Microscopy ◽  
Automotive Industry ◽  
Fuel Economy ◽  
High Strength ◽  
Al Alloys ◽  
Light Weight ◽  
Thin Sections ◽  
Strength And Durability ◽  
Rapidly Solidified ◽  
Whitney Aircraft

Light weight materials which possess high strength and durability are being utilized by the automotive industry to increase fuel economy. Rapidly solidified (RS) Al alloys are currently being extensively studied for this purpose. In this investigation the microstructure of an extruded Al-8Fe-2Mo alloy, produced by Pratt & Whitney Aircraft, Goverment Products Div. was examined in a JE0L 2000FX AEM. Both electropolished thin sections, and extraction replicas were examined to characterize this material. The consolidation procedure for producing this material included a 9:1 extrusion at 340°C followed by a 16:1 extrusion at 400°C, utilizing RS powders which have also been characterized utilizing electron microscopy.

Alternate Designs for Long Span Bridges

PCI Journal ◽  
1980 ◽  
Vol 25 (4) ◽  
pp. 48-58
Author(s):  
Felix Kulka
Keyword(s):  
Long Span Bridges ◽  
Long Span

Wind Buffeting in Time Domain Analysis of Long-Span Bridges using RM Bridge

2017 ◽  
Vol 109 (6) ◽  
pp. 3307-3317
Author(s):  
Afshin Hatami ◽  
Rakesh Pathak ◽  
Shri Bhide
Keyword(s):  
Time Domain ◽  
Time Domain Analysis ◽  
Domain Analysis ◽  
Long Span Bridges ◽  
Long Span
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