A methodology for evaluating the effects of spalling on the structural capacity of reinforced concrete bridge girders

2014 ◽  
Vol 41 (3) ◽  
pp. 197-205 ◽  
Author(s):  
Jeffrey Luckai ◽  
Maria Anna Polak ◽  
Scott Walbridge
Keyword(s):  
Reinforced Concrete ◽  
Rapid Assessment ◽  
Concrete Bridges ◽  
Bridge Girders ◽  
Reinforced Concrete Bridge ◽  
Reinforced Concrete Bridges ◽  
Structural Capacity ◽  
Practical Evaluation ◽  
Deterioration Mechanism ◽  
Existing Bridges

Corrosion of the reinforcing steel is a primary deterioration mechanism for reinforced concrete bridges. The spatial distribution of such spalling, relative to bar splices and laps, has not been considered in previous studies and may have a significant influence on structural capacity. In this paper, a modified area concept for considering this spalling is proposed. A methodology has been developed that employs this concept for the practical evaluation of existing bridges. It uses graphical spalling surveys, reinforcement layout information, and existing information regarding material and geometric properties as inputs for the flexural and shear analysis of deteriorated bridge girders. This methodology is easily adapted for full bridge analysis and to consider the effects of bar section loss and bond deterioration. A case study bridge is evaluated to show that this methodology offers a viable tool for the rapid assessment of spalled bridge girders to facilitate the prioritization of rehabilitation projects.

Performance Deterioration Behavior of Existing Reinforced Concrete Bridges

2009 ◽  
Vol 79-82 ◽  
pp. 1367-1370
Author(s):  
Xin Zheng An ◽  
Cheng Yi ◽  
Rui Xue Du
Keyword(s):  
Reinforced Concrete ◽  
Concrete Bridges ◽  
Stiffness Degradation ◽  
Loading Test ◽  
Reinforced Concrete Bridge ◽  
Concrete Deterioration ◽  
Reinforced Concrete Bridges ◽  
Static Loading Test ◽  
Performance Deterioration ◽  
Rebar Corrosion

The analyses of concrete from a bridge in Handan district shows that most bridges concrete should have cracked. The study of the technical measures against the performance deterioration of existing reinforced concrete bridges will undoubtedly become an imperative issue. In recent years, lots of bridges have been built in Handan. We choose a reinforced concrete bridge to investigate the effect of the effective member stiffness degradation and durability degradation induced by vehicle overload, vehicle overflow, rebar corrosion, and concrete deterioration on highway reinforced concrete bridges. And Static loading test was conducted at its middle span. Based on the test data in different circumstances, the seriousness of vehicle overload is discussed. In consequence, the performance of highway reinforced concrete bridges on stiffness degradation and durability degradation is more serious compared with the bridge under the condition of non-overloading. The results show that the process of rebar corrosion in highway reinforced concrete bridges is sped up under the condition of vehicle overload and vehicle overflow on the highway reinforced concrete bridges, which decreases the durability of the bridge structure, and the speed of the durability degradation increases as time goes on. The paper conclusion is instructive for the construction and maintenance of bridge.

Study on Tensile Strains in Concrete Bridge Girders

2013 ◽  
Vol 336-338 ◽  
pp. 309-312
Author(s):  
Yi Xi Yang
Keyword(s):  
Reinforced Concrete ◽  
Design Process ◽  
Lessons Learned ◽  
Concrete Bridges ◽  
Bridge Girders ◽  
Concrete Bridge ◽  
Design Constraints ◽  
Reinforced Concrete Bridges ◽  
Transducer Design ◽  
Design And Testing

In this paper, we present the design and testing of a simple yet accurate transducer for measuring strain in reinforced concrete bridges. Lessons learned from two earlier versions of the transducer, the first of which was incorporated into the design constraints and criteria. The following sections present the transducer design process, review the calibration and lab testing of the transducer prototype, and summarize the transducer performance in the field.

scholarly journals New contributions to the international workshop on the seismic and retrofitting of reinforced concrete bridges Bormio, Italy, April 2-5, 1991

1991 ◽  
Vol 24 (2) ◽  
pp. 139-201 ◽  
Author(s):  
R. Park ◽  
H. E. Chapman ◽  
L. G. Cormack ◽  
P. J. North
Keyword(s):  
Reinforced Concrete ◽  
International Workshop ◽  
Active Regions ◽  
Concrete Bridges ◽  
Reinforced Concrete Bridge ◽  
Reinforced Concrete Bridges ◽  
Current State ◽  
Secondary Objective ◽  
Points Of View ◽  
Clear Statement

The main objective of the workshop was to provide a critical comparison of the current state-of-the-art and of the practice in reinforced concrete bridge seismic design and retrofitting between the main seismically active regions. A secondary objective was to produce a clear statement of research needs and to propose possible international research cooperation. Four points of view were to be considered and compared, according to a geographical base which also corresponds to different design philosophies: the European, American, Japanese and New Zealand approaches were to be discussed. Emphasis was to be put on discussion of unresolved differences between different design and research practices. The workshop was organised in four sections, dealing with (1) basic concepts, (2) detailing, (3) examples of application, and (4) retrofitting. Each section was to consist of a presentation from each of the groups involved and an in-depth discussion session.

scholarly journals Reinforced concrete bridges: effects due to corrosion and concrete young modulus variation

2012 ◽  
Vol 5 (3) ◽  
pp. 388-419
Author(s):  
P. T. C. Mendes ◽  
M. L. T. Moreira ◽  
P. M. Pimenta
Keyword(s):  
Reinforced Concrete ◽  
Road Network ◽  
Young Modulus ◽  
Concrete Bridges ◽  
Finite Element Models ◽  
Reinforcement Corrosion ◽  
Shell Elements ◽  
Reinforced Concrete Bridge ◽  
Structural Evaluation ◽  
Reinforced Concrete Bridges

Most of the Brazilian bridges of federal road network are made of reinforced concrete and are more than 30 years old, with little information about the mechanical properties of their constitutive materials. Along the service life of these bridges much modification occurred on vehicles load and geometry and in design standard. Many of them show signs of concrete and steel deterioration and their stability conditions are unknown. With the aim of contributing to the structural evaluation of reinforced concrete bridges it was decided to analyze the stresses in reinforced concrete bridge sections to verify the effects due to reinforcement corrosion and variation of the concrete Young modulus on the stress distribution regarding several load patterns and cracking effects in a representative bridge of the Brazilian road network with different longitudinal reinforcement taxes and two concrete Young modulus, Ec and 0.5Ec, and with different percentage of reinforcement corrosion. The analysis considered two finite element models: frame and shell elements as well as solid elements. The results indicate that these variation effects are more significant in reinforcement bars than in concrete.

Study on Analysis and Preventive Measures for Damage of Durability of Reinforced Concrete Bridges

2013 ◽  
Vol 779-780 ◽  
pp. 1070-1076
Author(s):  
Jia Ying Sun ◽  
Cheng Hua Huang
Keyword(s):  
Reinforced Concrete ◽  
Preventive Measures ◽  
Steel Slag ◽  
Concrete Bridges ◽  
Concrete Bridge ◽  
Freezing And Thawing ◽  
Reinforced Concrete Bridge ◽  
Reinforced Concrete Bridges ◽  
Strength And Durability ◽  
Durability Of Concrete

Abstact: Based on the damage of five corrosive bridges concrete in Shanghai, it suggested that the strength and durability of C30 concrete have decreased seriously. These years, a lot of bridges, overhead roads and tram roads have been built, so the study on anticorrosion technology of reinforced concrete bridge will assuredly become a pressing issue. The main measure in this article is to design the durability of concrete aiming at the reasons why durability decreases at the different environmental conditions. The results of the research suggested that the over-replacement with active mixture technology could assuredly make Cl- penetrative resistance, freezing and thawing resistance and carbonizing resistance improve. It was best when coefficient of over-replacement was 1.3, and slag was best followed by steel slag, and then fly ash. Furthermore, the over-replacement with active mixture technology could stay concrete forepart shrinkage rate, thereby improving the durability of concrete.

The Effect of Type and Height of Piers on the Seismic Behavior of Reinforced Concrete Bridges

2019 ◽  
Vol 41 ◽  
pp. 79-87 ◽  
Author(s):  
Mohamed Cherif Djemai ◽  
Mahmoud Bensaibi ◽  
Fatma Zohra Halfaya
Keyword(s):  
Reinforced Concrete ◽  
Structural Parameters ◽  
Strong Motion ◽  
Concrete Bridges ◽  
Geometrical Parameters ◽  
Girder Bridges ◽  
Building Research Institute ◽  
Reinforced Concrete Bridges ◽  
Dynamic Analyses ◽  
Strong Motion Database

Bridges are commonly used lifelines; they play an important role in the economic activity of a city or a region and their role can be crucial in a case of a seismic event since they allow the arrival of the first aid. Reinforced concrete (RC) bridges are worldwide used type view their durability, flexibility and economical cost. In fact, their behavior under seismic loading was the aim of various studies. In the present study the effect of two structural parameters i.e. the height and the type of piers of reinforced concrete bridges on seismic response is investigated. For that reason, different multi-span continuous girder bridges models with various geometrical parameters are considered. Then, non-linear dynamic analyses are performed based on two types of piers which are: multiple columns bent and wall piers with varying heights. In this approach, a serie of 40 ground motions records varying from weak to strong events selected from Building Research Institute (BRI) strong motion database are used including uncertainty in the soil and seismic characteristics. Modelling results put most emphasis on the modal periods and responses of the top pier displacements, they show the influence of the considered parameters on the behavior of such structures and their impact on the strength of reinforced concrete bridges.

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