Field Instrumentation and Long-term Monitoring of the FRP Bridge Over Dubois Creek in Great Bend, Pennsylvania PDF Download

Author: Ian C. Hodgson
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 97

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Author: David James Holdener
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 274

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"Field validation of fiber reinforced polymer (FRP) bridges through load testing provides a means of measuring the performance of a bridge over time. Non-contact optical surveying equipment is one such method that can be utilized to measure the deflection of bridges under a static truck load. This thesis looks at monitoring bridges over time that have been both strengthened and constructed with FRP technologies. Five structurally deficient Missouri bridges have recently been retrofitted with FRP technologies with the intent to validate the overall in-situ performance. Testing focused on Nondestructive testing (NDT) techniques as a means of conducting these tests without damaging the existing structures. Static load testing was conducted and the results of the pre-strengthened and post-strengthened deflections have been used to evaluate the structural health over time"--Abstract, leaf iii.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 63

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Author: Terry J. Wipf
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 136

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This report describes the field application of the tilt sensing method for monitoring movement of the Black Hawk and Karl King Bridges. The study objectives were: to design a data acquisition system for tilt sensing equipment utilizing a telephone telemetry system; to monitor possible movement of the main span pier, Pier No. 2, on the Black Hawk Bridge in Lansing and the possible long-term movement of Pier No. 4 on the Karl King Bridge in Fort Dodge; and to assess the feasibility, reliability, and accuracy of the instrumentation system used in this study.

Author: Niket M. Telang
Publisher: Transportation Research Board
ISBN: 0309098564
Category : Bridges
Languages : en
Pages : 175

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Author: Wenjie Liu
Publisher:
ISBN:
Category :
Languages : en
Pages : 73

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Since 1996, over 30 Fiber Reinforced Polymer (FRP) composite bridges have been installed in the United States. Bridge locations are in Kansas, Missouri, New York, Iowa, Colorado, West Virginia, Ohio, California, Idaho, Washington, Pennsylvania, Illinois, Maryland, Oregon, North Carolina and South Carolina. Compared to traditional steel and concrete bridge structures, the FRP panel shows several significant advantages: reduced weight, higher strength, better corrosion resistance and quicker installation. However, FRP materials exhibit different physical properties. As such, a composite bridge would demonstrate different deformation and failure patterns than a traditional bridge. During the past years, much experimental research has been conducted to investigate FRP bridge deck performance. Most experiments divide into two types: 1) static and fatigue tests in the laboratory and 2) real traffic load tests in the field. These experimental results, as well as FEM analytical results, have served as baseline data for FRP bridge deck design. A long-term remote monitoring system was designed to investigate the response of the No-Name Creek composite bridge to the local weather. The characteristics of the bridge temperatures, the temperature differences of the two panel surfaces and the relationship between the temperature difference and the deflection were investigated with respect to the different weather patterns. Twelve thermal sensors were embedded into the FRP bridge panels. In addition, 3 laser sensors were installed to measure bridge thermal deflection. Between October 2004 and September 2005, bridge temperature and deflection were measured at 20 minute intervals. Relations between weather condition, temperature distribution and bridge thermal deflection for that bridge were analyzed. From the analysis of the experimental and FE methods, the responses of the composite bridge to weather are summarized as follows: (1) The temperatures of the upper and bottom panel surfaces and their differences greatly change with time of day and season. The extreme temp usually appears in the early afternoon and the minimum temp usually appears in the early morning or in the night. The bottom surface temperature is near the climatic temperature. (2) The bridge deflections are approximately proportional to the temperature differences. (3) The bridge had a significant upward deflection on a sunny day during the summer with the maximum often occurring between 3:00-5:00PM. The bridge has a downward deflection during the night with it being the most severe in the winter. (4) Comparing climate induced deflection to traffic load induced deflection, the climate induced deflection is at least on the same order of deflection as allowable traffic load. Therefore, it should be considered in the FRP bridge design process. (5) Thermal load and deflection usually are larger on clear days than on unclear, rainy, and snowy days. (6) Distributions of thermal load in the panel can form a larger amount of deflection in the hot season than in the cold season.

Author: Arthur J. Helmicki
Publisher:
ISBN:
Category : Cantilever bridges
Languages : en
Pages : 178

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The replacement of the US Grant Bridge over the Ohio River in Portsmouth, OH, was initiated in 2001 when the original bridge was closed and demolished, and its substitute opened in 2006. The new design is a steel cable stay design with steel girders and floor-beams supporting a post-tensioned concrete deck system nearly 65' wide carrying one lane of traffic in each direction. The combination of epoxy-coating, grout filling, and outer tubing provides protection for the all-important structural cabling suspension system from both weather and corrosion. Ironically, however, these same features make it impossible to gain direct access to either the cables or the interior of the anchorages which, in turn, presents special challenges for inspection and rehabilitation of these critical bridge components on bridges of this type. It was envisioned that its long-term behavior and any associated changes in its structural condition could be best understood with the aid of a longitudinal study beginning during bridge construction, one that includes instrumented monitoring of both construction/erection and in-service phases of the life of this bridge. Such an approach, integrated with traditional bridge management techniques, would help lead to a safe and economical realization of the 100-year design life of this structure. A health monitoring system for the bridge would be designed, planned, and implemented, with data collection and archival throughout its construction and ultimately an automated, user-friendly interface on a dedicated website.

Author: Jason Lloyd
Publisher:
ISBN: 9781622602742
Category :
Languages : en
Pages :

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With the advancement of many off-the-shelf data acquisition systems readily available today and the availability of 3G and 4G high-speed wireless cellular networks, the potential for remote monitoring of critical bridges has never been better. Needs exist regarding scour and general structural response for long-term monitoring. However, short-term monitoring using quickly deployable, rugged systems are also desirable in cases where impact, fire, environmental effects, or other damage may occur. These robust systems can be deployed rapidly, and endure harsh elements, enabling DOTs to constantly assess and monitor a structure, or a network of structures. Hence, the objective of this project is to explore the feasibility and proof of concept of using a web-based bridge monitoring interface for use on selected INDOT bridges for both short-term and long-term applications. This report will focus on a single case study, the Virginia Ave Bridge over I-65 SB, a steel plate girder bridge that frequently falls victim to truck impact as a result of low clearance. This case study is uniquely different and provides insight into how targeted instrumentation systems can be used to probe specific parameters desired by owners for bridge condition assessment and monitoring. It will be shown how commercially available instrumentation systems can be tailored to fit any unique application required. Additionally, it will be demonstrated that INDOT benefited from this specific case of field-deployed, short-term monitoring, which included automated notifications of critical onsite conditions.

Author: Vasileios Samaras
Publisher:
ISBN:
Category :
Languages : en
Pages : 444

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Real-time monitoring of fracture critical steel bridges can potentially enhance inspection practices by tracking the behavior of the bridge. Significant advances have occurred in recent years on the development of robust hardware for field monitoring applications. These systems can monitor, process, and store data from a variety of sensors (e.g. strain gages, crack propagation gages etc.) to track the behavior of the bridge. The research outlined in this dissertation is part of a large study focused on the development of a wireless system for use in long-term monitoring of bridges. The wireless monitoring system had a target maintenance-free life of ten years, and independent from the power grid. Thus, the feasibility to harvest energy for the monitoring system is an important step in the development of the system. In addition, the reliability of the sensors in the bridge is very important upon the success of the system. The focus of this dissertation is on two primary aspects of the wireless monitoring system. First, the feasibility to harvest energy from vehicular-induced vibrations is evaluated through analytical models of highway bridges under truck loads. Acceleration results from simple line-element models and detailed finite element models of five steel bridges in Texas and Oregon are compared with actual field data from the same bridges. Second, the dissertation also highlights studies on the identification of strain gages and installation procedures that result in long lives. In addition, the effect of temperature fluctuations and other environmental factors on the sensor drift and noise is also considered. In long-term monitoring applications, slight sensor drift and noise can build up over time to produce misleading results. This dissertation presents the results of transient dynamic analyses of bridges under moving truck loading and laboratory tests on gage durability that were conducted as part of a research project sponsored by the National Institute of Standards and Technology (NIST).

Author: Maria Q. Feng
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 134

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