Concrete bridges: inspection, repair, strengthening, testing and load capacity evaluation

1996 ◽  
Vol 34 (03) ◽  
pp. 34-1572-34-1572
Keyword(s):  
Load Capacity ◽  
Concrete Bridges ◽  
Capacity Evaluation

Monitoring of a Norwegian steel-concrete bridge strengthening for composite action

2021 ◽  
Author(s):  
Victor Vestman ◽  
Peter Collin ◽  
Robert Hällmark ◽  
Magnús Arason
Keyword(s):  
Load Capacity ◽  
Design Procedure ◽  
Concrete Bridges ◽  
Traffic Load ◽  
Traffic Density ◽  
Concrete Bridge ◽  
Composite Action ◽  
Shear Connectors ◽  
Coiled Spring ◽  
Existing Bridges

<p>Traffic density and vehicle weight have been increasing over time, which implies that many existing road bridges were not designed for the high service loads and the increased number of load cycles that they are exposed to today. One way to increase the traffic load capacity of non-composite steel- concrete bridges is to use post-install shear connectors and one type of shear connector is the coiled spring pin. This type of connector has advantages for strengthening of existing bridges, since it enables an installation from below while the bridge is still in service and does not bring along removal of concrete and pavement, nor welding to the top flange.</p><p>This paper describes one ~50 years old Norwegian single span steel-concrete bridge that was strengthened with post-installed coiled spring pins. The strengthening method and the design procedure are presented, along with the results from a field monitoring on Sagstu bridge, performed to evaluate the behaviour of the strengthened structure. The results show that the coiled spring pins counteract the slip and bring along a very good degree of composite action.</p>

APPLICABILITY OF WIDE-RANGE ULTRASONIC TESTING TO NON-DESTRUCTIVE INSPECTION OF GROUT CONDITION IN PRESTRESSED CONCRETE BRIDGES

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Kuniharu Fukushima ◽  
Kimihiko Amaya ◽  
Takanori Kinoshita ◽  
Isamu Yoshitake
Keyword(s):  
Prestressed Concrete ◽  
Ultrasonic Testing ◽  
Load Capacity ◽  
Comparative Investigation ◽  
Concrete Cover ◽  
Concrete Bridges ◽  
Inspection Method ◽  
Wide Range ◽  
Inspection Techniques ◽  
Non Destructive

Complete grouting of tendon ducts is important for durability of post-tensioned prestressed concrete (PC) bridges. Voids in the ducts may induce failure of PC tendons, possibly causing a reduction in load capacity and collapse of the bridge. The wide-range ultrasonic testing (WUT) is one of the non-destructive inspection techniques. The focus of this study is to examine the applicability of the WUT to grout inspection. This paper summarizes the characteristics of the non-destructive methods available for the PC grout inspection and outlines the sensing and analyzing techniques of the WUT method performed in practice in PC bridge construction. The inspection accuracy of the WUT method was examined by comparison to a sensor-based inspection method. This paper also reports comparative investigation and discusses the advantages of the WUT method including inspection accuracy, cost performance, time efficiency and safety. It was confirmed in on-site application that the WUT method was capable of determining grout condition at a concrete cover depth of 250 mm.

Safety Evaluation of Reinforced Concrete Girder Bridge after Strengthened with Pasting Technology

2014 ◽  
Vol 919-921 ◽  
pp. 443-447
Author(s):  
Zhi Meng Zhao ◽  
Ke Da Liu ◽  
Jin Yi Chai ◽  
Le Le Lei ◽  
Qi Wang ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Prestressed Concrete ◽  
Load Capacity ◽  
Safety Evaluation ◽  
Reinforced Concrete Beam ◽  
Concrete Bridges ◽  
Steel Plates ◽  
Expansion Joints ◽  
Girder Bridge

This paper examines the load capacity and safety of reinforced concrete beam bridge strengthened with pasting steel plates and carbon fiber polymer technology, taking the Longwanggou Bridge built in Jungar Qi in 1980s,a coal-rich area in Inner Mongolia, for example, in accordance with the Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts (JTG D62-2004), and the Code for Design of Highway Bridge Strengthening (JTG /T J22-2008). The girders in superstructure of this bridge were strengthened by using pasting steel plate technology, while the capping beams of piers and abutments using combined technology of sticking steel plates and carbon fiber reinforcement polymer (CFRP). At the same time, the deck pavement and the expansion joints were replaced, with adjusting the continuous form of the bridge, to improve the integrity and its driving comfort. The results from the theoretical analysis and dynamic and static load tests on the bridge after strengthening have shown that it is safe and good in the integrity and reliable in the load capacity.

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