Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 31 for “"Steel bridge"”.
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Reliability of corroded steel bridge girders
… is one of the main causes of deterioration of bridges. Structures exposed to harsh environmental conditions are subjected to time-variant changes of their load-carrying capacity. Thus, there is a need for an evaluation to accurately assess the actual condition and predict the remaining life of …
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Repair of Steel Bridge Girders Damaged by Distortion-Induced Fatigue
… fatigue as the leading cause of cracks in steel bridges built prior to the mid-1980s. Experimental and computer simulations of 914-mm (36-in.) deep girder-cross frame subassemblies subjected to cyclic loading were carried out to study the effects of distortion-induced fatigue and to …
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Heuristic, qualitative, and quantitative reasoning about steel bridge fatigue and fracture
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1989.
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Mag Feet : a robotic device for the inspection of steel bridge structures
The aging of America's steel bridges presents many challenges. Undetected cracks and corrosion can eventually lead to catastrophic failure. Due to the difficulties with inspecting existing bridges the use of mobile robots for steel bridge inspection has become an important area of research. This …
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Computerized Ultrasonic Raytracing Model for C-scans of Solid Steel Bridge Pins
… of computerized ultrasonic C-scanning of solid steel bridge pins using a raytrace model. The raytrace model was developed to facilitate interpretation of data obtained from an ultrasonic C-scanning system for the Virginia Transportation Research Council (VTRC). The report discusses the reasons …
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Analysis of acoustic emission waveforms from fatigue cracks on a steel bridge hanger
Fatigue cracks on a steel bridge hanger were monitored for acoustic emission in conjunction with strain gage monitoring. Waveforms of emissions were collected and classified using source location, strain magnitude, position on strain cycle and uniqueness of waveforms as the primary criteria. A vast …
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Behavior of hollow-core fiber reinforced polymer-concrete-steel bridge columns under extreme loading
… hollow-core fiber reinforced polymer-concrete-steel (HC-FCS) bridge columns under extreme loading. The HC-FCS column consists of a concrete wall sandwiched between an outer fiber reinforced polymer (FRP) tube and an inner steel tube. The steel tube was embedded into a reinforced concrete …
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Methods for Evaluation of the Remaining Strength in Steel Bridge Beams with Section Losses due to Corrosion Damage
… to better understand the structural behavior of steel bridge beams that have experienced section loss near the bearings. This type of deterioration is common in rural bridges with leaking expansion joints, which exposes the superstructure to corrosive road deicing solutions. Seventeen beams from …
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STANDARDS TO CONTROL FRACTURE IN STEEL BRIDGES THROUGH THE USE OF HIGH-TOUGHNESS STEEL AND RATIONAL INSPECTION INTERVALS
Non-redundant steel bridge systems have been used for major bridges in the United States since the late 1800’s. Designers recognized the inherent structural efficiency and economy associated with two-girder and truss systems. Unfortunately, early knowledge was limited regarding fatigue, fracture, …
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Custom-Engineered and Additively Manufactured Components for Strengthening Steel Bridges
… a primary deterioration mechanism in aging steel bridge infrastructure, reducing stifness and load-carrying capacity. Current inspection practices are largely qualitative, and conventional repair methods often restore nominal area without fully addressing irregular corrosion geometry. This …
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FEA methodology for system-level redundancy evaluation: Application to non-composite steel bridges
<p>Currently, all steel bridges with members designated as Fracture Critical Members (FCMs) are required to undergo hands-on inspections every 24 months. A FCM is a primary steel tension member (or portion of) which failure results in collapse or loss of serviceability of a bridge. However, …
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Evaluation of moment redistribution for hybrid HPS 70W bridge girders
… studies have demonstrated that the use of hybrid steel bridge I-shaped girders (specifically sections incorporating Grade 50 webs and High Performance Steel (HPS) 70W flanges) can produce steel weight savings and overall design economy for a wide range of typical steel bridge superstructures. …
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Pier moment-rotation behavior of high performance steel HPS70W I-girders
… of compact and noncompact high performance steel HPS70W I-shape girders in the context of examining two restrictions for inelastic design of steel bridge girders in the current edition of the AASHTO LRFD bridge code (AASHTO, 1998 and interim 2001). The first restriction is that inelastic …
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A mix-use design proposal of the Martin Luther King bridge : a study of the use of a bridge in a historic St. Louis riverfront
… the levee of the Mississippi spanned by a 1950's steel bridge in a historic St. Louis district known as Laclede's Landing. My intentions are to introduce a connection between the river and the city that will provide access to the water's edge to create a linear park or esplanade alongside Wharf …
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The Effects of Stream Crossings and Associated Road Approaches on Water Quality in the Virginia Piedmont
… four different stream crossing structures: 1) steel bridges, 2) pole bridges (pipe with poles), 3) standard culverts, and 4) re-enforced fords (with GeoWeb or Geotextile) to determine the influence of stream crossing type on water quality and to evaluate erosion associated with stream crossing …
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Folded Intersection: a performing arts center
… boundary. Two folded bands, one made of skeletal steel and surfaced with copper connecting the river and the mountainous landscape beyond with the city, the other made of reinforced concrete folded to form a spatial intersection housing a series of activities: performing, spectating, and …
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Static push-out tests and finite element studies on larger diameter shear studs for composite steel bridges
Efficient steel bridge girder design makes use of composite action between the concrete bridge deck and the steel girders. The critical link between the deck and the girders are shear studs welded to the girder top flange. The most commonly used shear studs have a 7/8-inch diameter and are welded …
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A Numerical Based Determination of Stress Intensity Factors for Partially Cracked Flexural I-shaped Cross-sections
… design specifications and the AASHTO manual for bridge evaluation are consistently revised using knowledge of previous bridge failures. Although modern steel structures are designed to resist fatigue cracking from service loads, cracks in the tension flanges of steel bridge girders have been …
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Surface and Sub-Surface Analyses for Bridge Inspection
The development of bridge inspection solutions has been discussed in the recent past. In this dissertation, significant development and improvement on the state-of-the-art in the field of bridge inspection using multiple sensors (e.g. ground penetrating radar (GPR) and visual sensor) has been …
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