scholarly journals Design and Physical Detection of Bridge Tower and Externally Prestressing Cable for Existing Bridge Strengthened by A Cable-Stayed System

2021 ◽  
Vol 2083 (2) ◽  
pp. 022078
Author(s):  
Xianggang Wang ◽  
Yongcheng Yang ◽  
Yongli Shen ◽  
Xing Xin ◽  
Jian Jia ◽  
...  
Keyword(s):  
Yellow River ◽  
Highway Bridges ◽  
Construction Technology ◽  
Bridge Structure ◽  
Box Girder ◽  
Performance Requirements ◽  
Relevant Reference ◽  
Externally Prestressing ◽  
Main Bridge ◽  
Bridge Tower

Abstract With the continuous development of economy, the increasing traffic volume has brought greater burden to highway bridges. In this paper, a Yellow River Bridge is taken as an example. The cracking and deflection of the box girder of the main bridge have affected the structural performance requirements of the bridge operation. Based on this situation, the cable-stayed system is used to reinforce the bridge, and the construction process of bridge tower, cable saddle, steel anchor box and external beam is described in detail. The theoretical calculation and practice show that this method can effectively strengthen the bridge structure, and the cable-stayed system reinforcement method, as a mature, reasonable and operable construction technology, provides relevant reference for the reinforcement research of similar bridges.

Dimension and Frequency Profiles of Concrete Highway Bridges in New Madrid Region of Southeastern Missouri

1997 ◽  
Vol 1594 (1) ◽  
pp. 84-93 ◽  
Author(s):  
Ralph Alan Dusseau
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Highway Bridges ◽  
Ambient Vibration ◽  
Earthquake Hazards ◽  
Empirical Formulas ◽  
Reinforced Concrete Slab ◽  
Box Girder ◽  
Bridge Spans ◽  
New Madrid

The results of a study funded by the U.S. Geological Survey as part of the National Earthquake Hazards Reduction Program are presented. The first objective of this study was the development of a database for all 211 highway bridges along I-55 in the New Madrid region of southeastern Missouri. Profiles for five key dimension parameters (which are stored in the database) were developed, and the results for concrete highway bridges are presented. The second objective was to perform field ambient vibration analyses on 25 typical highway bridge spans along the I-55 corridor to determine the fundamental vertical and lateral frequencies of the bridge spans measured. These 25 spans included six reinforced concrete slab spans and two reinforced concrete box-girder spans. The third objective was to use these bridge frequency results in conjunction with the dimension parameters stored in the database to develop empirical formulas for estimating bridge fundamental natural frequencies. These formulas were applied to all 211 Interstate highway bridges in southeastern Missouri. Profiles for both fundamental vertical and lateral frequencies were then developed, and the results for concrete highway bridges are presented.

scholarly journals Numerical Analysis of Temperature Influence on Transverse Cracks in Concrete Box-Girder Bridges

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Hanzheng Xu ◽  
Xiaofeng Yan
Keyword(s):  
Numerical Analysis ◽  
Highway Bridges ◽  
Hydration Reaction ◽  
Box Girders ◽  
Transverse Cracks ◽  
Box Girder Bridges ◽  
Box Girder ◽  
Girder Bridges ◽  
Concrete Box Girder ◽  
Concrete Box Girder Bridges

Concrete box-girder bridges are widely used in China. During several routine inspections of two-year-old highway bridges of this type in the China Central Plains region, we found that transverse cracks are widespread on the bottom flanges of those box girders, mainly distributed in the area of 1/4L to 3/4L of the span. Selected cracks were then monitored continuously for one year. Our results showed that there had been no change in the widths of the cracks, but their lengths had increased and new cracks had formed. Taking into consideration factors like hydration reaction, relative humidity difference, shrinkage and creep, sunlight thermal differential effect, sudden temperature change, vehicle load, and their combined efforts, we have developed spatial structural models and conducted stress analyses on the reinforced concrete and prestressed concrete box-girder bridges, respectively. Our numerical analysis results indicated that the hydration reaction is the main reason for the initial bottom flange crack and the temperature difference between the inside and the outside of the box girders caused the crack developments at the later stage.

Strengthening Paudèze bridges decks using UHPFRC struts

2019 ◽  
Author(s):  
Philippe Menétrey ◽  
Lionel Moreillon ◽  
Maléna Bastien-Masse
Keyword(s):  
High Performance ◽  
Bridge Deck ◽  
Experimental Tests ◽  
Highway Bridges ◽  
Fiber Reinforced Concrete ◽  
Bending Moments ◽  
Box Girder ◽  
High Performance Fiber ◽  
Over 40 Years ◽  
Deck Slab

<p>Paudèze bridges are two 400‐m long parallel highway bridges located in Switzerland and opened to traffic in 1974. After over 40 years of service life, both bridges must be completely rehabilitated and strengthened while constantly maintaining 2 traffic lanes in both directions.</p><p>The bridge deck slab was strengthened using UHPFRC (Ultra‐High Performance Fiber Reinforced Concrete) struts. These inclined struts connect the end of the deck slab cantilever and the box girder web, forming a Warren truss. They thus reduce the bending moments in the deck slab and the existing steel reinforcement could be kept.</p><p>The joint between the prefabricated UHPFRC struts and the existing concrete web is done through a cast in‐ place UHPFRC beam, without any mechanical connection. Forces go through the joint and into the web by a combination of friction and compression forces.</p><p>Various experimental tests and numerical simulations confirmed the feasibility of this solution. In particular, the UHPFRC‐concrete web connection, the UHPFRC‐UHPFRC connection and the global behavior of the strut were tested and modelled.</p><p>The strengthening of the bridges decks took place between 2017 and 2019. The developed solution, using UHPFRC struts, was shown to be very effective to strengthen the deck and creates a rhythm in the structure.</p>

Numerical and Experimental Assessment of the Highway Arch Viaduct

2015 ◽  
Vol 769 ◽  
pp. 252-259
Author(s):  
Jan Bencat ◽  
Maria Stehlikova ◽  
Milan Skarupa
Keyword(s):  
Dynamic Testing ◽  
Highway Bridges ◽  
Structural Condition ◽  
Traffic Load ◽  
Analytical Models ◽  
Mode Shapes ◽  
Bridge Structure ◽  
Modal Damping ◽  
Bridge Structures ◽  
And Performance

Full–scale dynamic testing of bridge structures can provide valuable information on the service behavior and performance of structures. With the growing interest in the structural condition of highway bridges, dynamic testing can be used as a tool for assessing the integrity of bridges. From the measured dynamic response, induced by instructed passing trucks, modal parameters (natural frequencies, mode shapes and modal damping values) and system parameters (stiffness, mass and damping matrices) are obtained. These identified parameters can then be used to characterize and monitor the service of the bridge structure in the future. Analytical models of the structure can also be validated using these parameters [1,2]. The paper presents a procedure for estimating the traffic load bearing capacity of the steel arch highway viaduct Bridge Structure 205 (DC1–9, 755 m) constructed on Highway D1 in Nord Slovakia (Fig. 1) over the natural hollow basin via dynamic tests of the viaduct structures.

Experimental Research on Special-Shaped CFST Arch Bridge Model

2011 ◽  
Vol 243-249 ◽  
pp. 1835-1841
Author(s):  
Da Peng Gu ◽  
Yan Jiang Chen ◽  
Wei Ming Yan ◽  
Yong Li
Keyword(s):  
Experimental Research ◽  
Model Test ◽  
Static Model ◽  
Bridge Engineering ◽  
Bridge Structure ◽  
Arch Bridge ◽  
Bridge Model ◽  
Cfst Arch Bridge ◽  
National Road ◽  
Main Bridge

The main bridge structure of the bridge engineering cross Yitong river, on the 102 national road, is a three-Span flying swallow type special-shaped CSFT arch bridge. This paper introduces the design, process and results of the static model test of the CFST arch bridge.

Design of Reinforced Concrete Slant-Legged Rigid Frame Bridge

2011 ◽  
Vol 90-93 ◽  
pp. 1112-1115
Author(s):  
Shun Bo Zhao ◽  
Shi Ming Liu
Keyword(s):  
Reinforced Concrete ◽  
Numerical Model ◽  
Dynamic Properties ◽  
Construction Technology ◽  
Design Codes ◽  
Bridge Structure ◽  
Rigid Frame ◽  
Design Software ◽  
Rigid Frame Bridge ◽  
County Town

This paper introduces the design of a reinforced concrete slant-legged rigid frame bridge built in a county town. The bridge shape and structural project were selected considering factors such as hydrology, environment, art expression and construction technology. The design software MIDAS Civil 2006 was applied to build the numerical model for analyzing the static and dynamic properties of the bridge structure. The results show that the loading performances of the bridge satisfy the specifications of current Chinese design codes. The bridge was constructed and had been operating since Oct. 2008. Now, it becomes a landscape of the county town.

I-Girders Method Used to Support Existing Railway Operations During Highway Underpass Construction

2015 ◽  
Author(s):  
Chun-Hsing Ho ◽  
Junyi Shan ◽  
Feiyue Wang ◽  
Yiyang Chen
Keyword(s):  
Reliable Method ◽  
Metropolitan Areas ◽  
Construction Safety ◽  
Construction Technology ◽  
Bridge Structure ◽  
Railway Operations

In metropolitan areas, when a highway underpass project is being planned to go beneath an existing railway corridor, there are a number of concerns that could have an impact on the project. For example, will the underpass construction impact the existing railway operations? How to maintain the construction safety in both rail and highway operations? This paper brings construction technology using I-girder systems to provide a solution for highway underpass projects constructing beneath the existing rail corridors. The I-girder systems have been proved as a reliable method for highway underpass construction without the interruption of railway operations. This type of I-girder systems has been widely used in several countries as a temporary “bridge” structure in support of dynamic rail movements during underpass construction. Depending on the spans of underpass structures, a contractor can decide the number of I-girder units to be assembled and installed on site. This paper describes the construction procedures of the I-girder systems installation and daily inspection processes. A case study is used to demonstrate the applicability of I-girder systems in ensuring underpass construction smoothly while maintaining existing railway operations in a safety manner. During the construction of underpass, the contractor encountered geotechnical issues that had a severe impact on the construction safety and the integrity of foundation. This paper further discusses strategies that were used to mitigate the potential building collapses and foundation failures. It is concluded the method of I-girder systems is capable of supporting railway dynamic movements during highway underpass construction.

Static and Dynamic Response Contrast Simulation of Long-Span Beam Bridge Subjected to Flowing Ice

2012 ◽  
Vol 594-597 ◽  
pp. 1573-1576
Author(s):  
Zhi Ping Bai ◽  
Xie Dong Zhang ◽  
Cheng Lin Han
Keyword(s):  
Finite Element Method ◽  
Yellow River ◽  
Bridge Structure ◽  
Deformation Effect ◽  
Soil Function ◽  
Action Mode ◽  
Long Span ◽  
Long Span Bridge ◽  
Static Action ◽  
Beam Bridge

According to pile-soil function and damper boundary condition influence by Finite Element Method, taking Bao-Shu yellow river extra long-span bridge as the project object, the deformation effect of the bridge subjected to flowing and melting ice in spring was analyzed considering static and dynamical action mode. The results revealed that the deformation from this kind of action is tittly small and the bridge structure is reliable and stable. Also the deformation effect of the pier from dynamic ice action is larger than static action. While for two or more piers, the results are reverse.Then the calculation and analysis have been put into design and construction stage.

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