Optimization of continuous steel plate girder bridges

1991 ◽  
Vol 3 (4) ◽  
pp. 231-239 ◽  
Author(s):  
A. M. Memari ◽  
H. H. West ◽  
T. M. Cavalier
Keyword(s):  
Steel Plate ◽  
Continuous Steel ◽  
Girder Bridges ◽  
Plate Girder

STRENGTH RECOVERY OF STEEL BRIDGES WITH CORROSION NEAR BEARINGS

2020 ◽  
Vol 7 (2) ◽  
Author(s):  
Naoyuki Asao ◽  
Yoshiichi Fujimoto
Keyword(s):  
Steel Plate ◽  
Shear Capacity ◽  
Analytical Models ◽  
Plate Girders ◽  
Girder Bridges ◽  
Strength Recovery ◽  
Reinforcement Measure ◽  
Vertical Stiffener ◽  
The 1960S ◽  
Plate Girder

A lot of steel plate girder bridges were erected during the rapid growth in the 1960s in Japan. Currently, the condition of those aging bridges has become marked and a problem in society since over 50 years have passed. Particularly, the corrosion-induced deterioration and damage in railway steel plate girder bridges, which have an open deck, is becoming prominent. Despite that, the evaluations of residual strengths and the strengthening methods of corroded bridges are not always enough. Therefore, firstly, this paper shows analytical-based evaluation results that explain how the residual shear capacities of plate girders, having corrosion near bearings, depend on the condition of the corroded surface, such as a vertical stiffener or a web. The results show the fracture mode as buckling changes as well as the residual shear capacity, according to the degree and form of corrosion. Next, this study proposes a reliable reinforcement measure to recovery the shear capacity by applying said evaluation results and analytical models. Finally, the shear capacity could be improved tremendously by simple attachments as reinforced members.

scholarly journals Novel Approaches for Fracture Detection in Steel Girder Bridges

2019 ◽  
Vol 4 (3) ◽  
pp. 42 ◽  
Author(s):  
Mohammad Abedin ◽  
Armin B. Mehrabi
Keyword(s):  
Steel Plate ◽  
Distinct Pattern ◽  
Fracture Detection ◽  
Girder Bridges ◽  
Steel Girder Bridges ◽  
Periodic Monitoring ◽  
Self Powered ◽  
Girder Bridge ◽  
Contact Sensors ◽  
Plate Girder

The bottom flanges of steel plate girder bridges can be considered fracture-critical elements depending on the number of girders and bridge configuration. For such cases, it is required that inspection of these bridges be carried out using costly “arms-length” approach. New techniques in structural health monitoring (SHM) that use non-contact sensors and self-powered wireless sensors present alternative approach for inspection. Application of such techniques would allow timely detection and application of repair and strengthening, in other word, providing for more resilient bridges. This paper investigates the feasibility of using a handful of self-powered wireless or non-contact sensors for continuous or periodic monitoring and detection of fracture in steel plate girder bridges. To validate this concept, vibration measurements were performed on an actual bridge in the field, and detailed finite element analyses were carried out on a multi-girder bridge. The records obtained show that vibration amplitude was significantly increased for fractured girder, and a distinct pattern of strain variation was registered in the vicinity of fracture, all of which can be detected effectively with relevant sensors. Moreover, the amplitude and frequency of the vibration was shown to be significant enough for providing the required power for typical sensor(s).

scholarly journals Estimating the Dynamic Behavior of Highway Steel Plate Girder Bridges Using Real-Time Strain Measurements

2020 ◽  
Vol 10 (12) ◽  
pp. 4215
Author(s):  
Mosbeh R. Kaloop ◽  
Emad Elbeltagi ◽  
Jong Wan Hu
Keyword(s):  
Real Time ◽  
Dynamic Behavior ◽  
Steel Plate ◽  
Damping Ratio ◽  
Dominant Frequency ◽  
Static Displacement ◽  
Strain Measurements ◽  
Girder Bridges ◽  
Double Filtration ◽  
Plate Girder

Structural health monitoring (SHM) techniques are used to assess the behavior of structures during or after construction. The high cost of sensors is the main reason for the limited use of the SHM techniques. The present study investigates the dynamic behavior (dynamic acceleration, semi-static displacement, frequency and damping ratio) of highway steel plate girder bridges using strain measurements. The double filtration and polynomial prediction methods are used to estimate the dynamic behavior of the bridge using real-time strain measurements. To verify the accuracy of the developed method, the field monitoring measurements of the WonHyo bridge is used. The bridge behavior under different truck speeds and weights is observed and evaluated. The displacement and acceleration measurements are used to examine the results of the proposed method. The results of this study demonstrate that the strain measurements can be used to obtain an accurate semi-static displacement and dominant frequency content of the bridge. The accuracy of the developed model for the semi-static and dynamic behaviors is 99% and 69%, respectively.

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