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.

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.

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.

ON THE EFFECT OF EFFORT REGULATION BY MEANS OF TEMPORARY CONTINUITYIN SPLIT SPAN STRUCTURES OF STEELREINFORCED CONCRETE BRIDGES

2021 ◽  
pp. 58-61
Author(s):  
I.Yu. Belutsky ◽  
◽  
I.V. Lazarev ◽  
Keyword(s):  
Reinforced Concrete ◽  
Bending Moment ◽  
Concrete Bridges ◽  
Stress Rate ◽  
Steel Reinforced Concrete ◽  
Reinforced Concrete Bridges ◽  
Effort Regulation

Abstract. The publication shows the effectiveness of applying the principle of temporary continuity by combining split span structures into acontinuous couplingusing a temporary joint. The method can be viewed as an option for effort regulation, creating abearing capacity reserveinload-bearing constructions within the span structures of bridges. The calculations provided show the effect on stress rate and bending moment in split span structurescombined into a double-spancontinuous coupling by a temporary joint.

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