Design and Construction of the Komono Secon Viaduct in Mie, Japan

2019 ◽  
Author(s):  
Tohru Makita ◽  
Yuichiro Nakamura ◽  
Shigeaki Kouroki ◽  
Tetsuya Yamazaki
Keyword(s):  
Service Life ◽  
Corrosion Protection ◽  
Prestressed Concrete ◽  
Composite Structure ◽  
Stay Cable ◽  
Box Girder ◽  
Stay Cables ◽  
Inspection And Maintenance ◽  
Key Aspects ◽  
Design And Construction

<p>The present paper describes key aspects of the design and construction of the Komono Second Viaduct. The viaduct is a three‐span prestressed concrete extradosed bridge with a three‐cell box girder across the Mitaki River, carrying the Shin‐Meishin Expressway at Komono, Mie Prefecture in Japan. The extradosed bridge has an overall length of 341m and a main span of 161m with a 23.35m wide deck carrying dual carriageway with two lanes for each direction. Dual central cable planes are adopted allowing for future deck widening. The stay cable consists of either 37 or 48 seven‐wire prestressing strands of 15.2mm diameter and has four‐layer corrosion protection system for 100‐year service life. The top half of the pylon is built with steel‐concrete composite structure and the stay cables are anchored inside the pylon box sections to facilitate inspection and maintenance works of the stay cable anchorages.</p>

Deviation saddles for cables bridges: development and qualification ofstay cable technology

2019 ◽  
Author(s):  
Julien-Erdem Erdogan ◽  
Ivica Zivanovic ◽  
Matthieu Guesdon
Keyword(s):  
Corrosion Protection ◽  
High Performance ◽  
Cost Effective ◽  
Stay Cable ◽  
Stay Cables ◽  
Accurate Definition ◽  
High Performance Fiber ◽  
Definition Of ◽  
Bridge Aesthetics ◽  
Cable Stayed Bridges

<p>Deviation saddles for cables are regularly used in projects such as cable stayed bridges, suspended bridges or extradossed bridges. The choice of a deviation saddle may be imposed to improve the bridge aesthetics with a slender pylon and to simplify the construction with a solid pylon section. Saddles are a proper anchorage and must be designed such as to ensure a safe transfer of vertical forces and of differential forces of stay cables into the pylon structure.</p><p>For parallel strand cables, since grouted stay cable tends to disappear from commonly accepted design and technologies, due to corrosion protection and fatigue issues, the most widely used concept of saddle is made of a battery of individual tubes, placed inside a guide pipe poured of concrete.</p><p>The most recent saddle system developed consists in allowing the passage of the strands through the saddle without individual tubes. Strands go directly through concrete recesses within the Ultra High Performance Fiber Concrete (UHPFC) matrix. Recesses are made thanks to reusable rubber bars removed after poured concrete is hardened. Thanks to an optimized cross section of the recesses, individual holes maximize the friction between the concrete and specially sheathed strands with local application of a cohesive sheathing (Cohestrand®), which allow strands to transfer important asymmetrical loads to the saddle without sliding. Meanwhile, a continuous corrosion protection is ensured by the strand sheathing from one deck anchorage to the other.</p><p>This make the use of saddle a cost-effective and durable mean to deviate and anchor parallel strand cables, that suits Owners needing simple but robust design for stay cable or extradossed bridges. Such saddle bridge design is nowadays clearly described in the 7<span>th</span> edition of the PTI recommendations, that specifies the qualification process of saddle technologies, especially in regards to the accurate definition of a minimum friction coefficient.</p>

Research and Analysis of Shear Connector in Prestressed Concrete Box-Girder with Corrugated Steel Webs

2013 ◽  
Vol 639-640 ◽  
pp. 790-795 ◽  
Author(s):  
Ming Hong Li ◽  
Yi Li Wang ◽  
Shang Min Zheng ◽  
Shui Wan
Keyword(s):  
Engineering Design ◽  
Prestressed Concrete ◽  
Composite Structure ◽  
Yangtze River ◽  
Shear Connector ◽  
Box Girder ◽  
Composite Girder ◽  
New Type ◽  
Design Case ◽  
Concrete Box Girder

The prestressed concrete box-girder with corrugated steel webs is a new type of steel-concrete composite structure. It has some advantages comparing with traditional prestressed concrete structure. Shear connector is a decisive component with which steel and concrete can work together in steel-concrete composite structure. In this paper, the most commonly used forms of shear connector in prestressed concrete composite girder with corrugated steel webs are introduced. The method of design and calculation of shear connector is described. Furthermore, the engineering design case of shear connector in the 4th Nanjing Yangtze River Bridge North Terminal Chuhe Bridge is presented. The method can be taken as a reference to the design of shear connector in the same kind bridge.

scholarly journals New directions for reinforced concrete coastal structures

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Steven Nolan ◽  
Marco Rossini ◽  
Chase Knight ◽  
Antonio Nanni
Keyword(s):  
Service Life ◽  
Prestressed Concrete ◽  
Composite Structures ◽  
Construction Materials ◽  
Design Guidelines ◽  
Coastal Structures ◽  
Frp Composites ◽  
The Us ◽  
Time Dependent Effect ◽  
Traditional Construction

AbstractWithin the last century, coastal structures for infrastructure applications have traditionally been constructed with timber, structural steel, and/or steel-reinforced/prestressed concrete. Given asset owners’ desires for increased service-life; reduced maintenance, repair and rehabilitation; liability; resilience; and sustainability, it has become clear that traditional construction materials cannot reliably meet these challenges without periodic and costly intervention. Fiber-Reinforced Polymer (FRP) composites have been successfully utilized for durable bridge applications for several decades, demonstrating their ability to provide reduced maintenance costs, extend service life, and significantly increase design durability. This paper explores a representative sample of these applications, related specifically to internal reinforcement for concrete structures in both passive (RC) and pre-tensioned (PC) applications, and contrasts them with the time-dependent effect and cost of corrosion in transportation infrastructure. Recent development of authoritative design guidelines within the US and international engineering communities is summarized and a examples of RC/PC verses FRP-RC/PC presented to show the sustainable (economic and environmental) advantage of composite structures in the coastal environment.

Study on Crack Causes and Strengthening Measures of Large Span PC Continuous Box Girder Bridges

2010 ◽  
Vol 163-167 ◽  
pp. 3551-3554
Author(s):  
Wei Peng ◽  
Zhi Xiang Zha
Keyword(s):  
Prestressed Concrete ◽  
Load Test ◽  
Box Girder Bridges ◽  
Element Analysis ◽  
Box Girder ◽  
Girder Bridges ◽  
Long Span ◽  
Concrete Box Girder Bridges ◽  
Girder Bridge ◽  
Engineering Projects

This template Based on cracks observation and finite element analysis of real engineering projects as well as bridge load test after reinforcement, causes and types of cracks in prestressed concrete box girder bridges and treating measurements are systematically studied. The results obtained from the calculation are presented to demonstrate the effect of sensitive factors, such as arrangement of longitudinal prestressed tendons, the magnitude of vertical prestressed force, temperature gradient, etc. The results show that the arrangement of longitudinal prestressed tendons and the magnitude of vertical prestressed force take key roles in cracks control of box girder webs. Lots of treating measurements are presented in accordance with different types of cracks, some of them are applied to a reinforcement engineering of a long span pretressed concrete continuous box girder bridge with cracks. Load test after reinforcement of the bridge demonstrates the reasonability of the treating measurements. Several design recommendations and construction measures about reinforcements and some sensitive factors mentioned above are proposed to control cracks.

The York-Arup cable experiments: Implications for the fire design of cable-supported bridges

2021 ◽  
Author(s):  
Benjamin Nicoletta ◽  
John Gales ◽  
Panagiotis Kotsovinos
Keyword(s):  
Thermal Strain ◽  
Experimental Studies ◽  
Thermal Response ◽  
Structural Response ◽  
Fire Performance ◽  
Stay Cable ◽  
Stay Cables ◽  
Bridge Structures ◽  
Recent Trends ◽  
High Level

<p>Recent trends towards performance-based fire designs for complex and critical structures have posed questions about the fire resilience of bridge infrastructure. There are little-to-no code requirements for bridge fire resistance and practitioner guidance on the subject is limited. Research on the fire performance of cable-supported bridge structures is scarce and knowledge gaps persist that inhibit more informed fire protection designs in a variety of bridge types. There have been few numerical or experimental studies that investigate the fire performance of steel stay-cables for use in cable-supported bridges. The thermal response of these members is critical as cable systems are highly dependent on the response of individual members, such as in the case of an anchor cable for example. The study herein examines the thermal response of several varieties of unloaded steel- stay cable during exposure to a non-standard methanol pool fire and the implications for the structural response of a cable-supported bridge. Experimental thermal strain data from fire tests of various stay-cables is used to inform high-level insights for the global response of a cable-supported bridge. Namely, the effects of cable thermal expansion on the overall cable system is approximated.</p>

scholarly journals A Design and Construction of the Precast Prestressed Concrete Through Type Girder Bridge

1988 ◽  
Vol 26 (4) ◽  
pp. 59-66
Author(s):  
O. Torii ◽  
M. Kanamori ◽  
T. Satoh ◽  
H. Nagasawa
Keyword(s):  
Prestressed Concrete ◽  
Girder Bridge ◽  
Precast Prestressed Concrete ◽  
Design And Construction

Experimental Study of Fatigue Performance of Stay Cable Damper

2014 ◽  
Vol 487 ◽  
pp. 404-407
Author(s):  
Dong Liang ◽  
Zi Shuo Li
Keyword(s):  
Experimental Study ◽  
Good Condition ◽  
Experimental Results ◽  
Test Results ◽  
Stay Cable ◽  
Damping Force ◽  
Durability Test ◽  
Equivalent Damping ◽  
Stay Cables ◽  
Performance Deterioration

Oil dampers are widely used as a popular countermeasure to mitigate the stay cables vibration. In this study, one actual oil damper designed for some long cable-stayed was experimentally investigated to evaluate the durability. 4 million cycles loading, with frequency of 4 Hz and amplitude of 1 mm, was imposed on the damper. The excitation displacement and damping force were measured and the equivalent damping was calculated from the experimental results. The stiffness effects of dampers behaved during durability tests were also analyzed quantitatively. The test results showed that the dampers were still in good condition after 4 million cycles loading and the dampers temperatures were stable at 50 degree centigrade during the test. According to the durability test results, a model for performance deterioration of damper was proposed to predict the lifetime of oil dampers.

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