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Showing 1 to 18 of 18 for “"Box Girder Bridge"”.
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Design of a cable-stayed precast post-tensioned box girder bridge
… the field of cable-stayed post-tensioned precast box girder technology and construction is presented. Likewise, a preliminary design for a 600 foot main span cable-stayed post-tensioned box girder bridge is presented. The analysis considers dead load, and live loadings acting on the girder using …
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An investigation into the usefulness of a method of analysis for straight, uniform-section, box-girder bridge decks with side cantilevers
… single-cell, uniform-section concrete box-girder bridge-decks with side cantilevers. This method only requires a calculator for execution and if a computer is used, results for maximum stresses may be obtained almost immediately. The authors state that since their method does not …
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Redundancy Evaluation of Fracture Critical Bridges
Cases of brittle fractures in major bridges prompted AASHTO to publish its first fracture control plan in 1978. It focused on material and fabrication standards, and required periodic 24-month hands-on inspection of bridges with fracture critical members. The practical result of this plan was to …
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Investigation of the Time-Dependent Longitudinal Flexural Behavior of the Varina-Enon Bridge
… throughout the United States highway system and bridge construction. Over time, the force in the prestressing strands is reduced by delayed strains in the concrete. The accurate estimation of this prestress loss is vital for making good decisions about the remaining capacity of a structure and …
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Effective Prestress Evaluation of the Varina-Enon Bridge Using a Long-Term Monitoring System and Finite Element Model
The Varina-Enon Bridge is a cable-stayed, precast, segmental, post-tensioned box girder bridge located in Richmond, Virginia. Inspectors noticed flexural cracking in July of 2012 that prompted concerns regarding long-term prestress losses in the structure. Prestress losses could impact the future …
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Long-Term Monitoring and Evaluation of the Varina-Enon Bridge
… can reduce flexural capacity. The Varina-Enon Bridge is a cable-stayed, precast, segmental, post-tensioned box girder bridge located in Richmond, Virginia. Observation of flexural cracks in the bridge by inspectors promoted a study regarding long-term prestress losses in the structure. For …
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The structural behaviour of horizontally curved prestressed concrete box girder bridges
Bridges are important and efficient structures which are comprised of a number of elements andsubstructures, namely the deck, abutment and foundation and possibly additional intermediatesupports. Recently the horizontally curved box girder bridge has become more desirable inmodern motorway systems …
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Thermal Gradients in Southwestern United States and the Effect on Bridge Bearing Loads
Thermal gradients became a component of bridge design after soffit cracking in prestressed concrete bridges was attributed to nonlinear temperature distribution through the depth of the bridge. While the effect of thermal gradient on stress distributions has been previously investigated in concrete …
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Refined Evaluation of Effective Prestress in the Varina-Enon Bridge
The Varina-Enon Bridge is a cable-stayed, post-tensioned segmental box girder bridge in Richmond, Virginia. A large flexural crack was noted by inspectors in July 2012 which prompted a number of investigations into the current condition of the bridge. Particular focus has been put on prestress …
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Non-Standard Fixed Hsla-V Military Bridge: Fabrication, Testing, and Model Simulation
… a number of 'fixed' or 'semi-permanent' bridge types to ensure critical sustainment is uninterrupted along military supply routes, and the designs are classified as standard (panel) and nonstandard, e.g. Army Facilities Components Systems (AFCS). The AFCS bridges consist of a series of …
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Integration of Traffic and Structural Health Monitoring Systems Using A Novel Nothing-On-Road (NOR) Bridge-Weigh-In-Motion (BWIM) System
Bridges are vital components of the U.S. transportation network. However, every year, the transportation agencies report a large number of aging bridges that are structurally damaged. Also, evolving traffic and particularly the overloaded traversing traffic can threaten the bridges' integrity and …
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Evaluation of redundancy in trapezoidal box-girder bridges using finite element analysis
The AASHTO Bridge Design specifications define a fracture-critical member as a component in tension whose failure is expected to result in the collapse of a bridge. The tension flanges of twin box-girder bridges are thus labeled as fracture-critical. In order to avoid the catastrophic collapse …
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Effects of thermal loads on Texas steel bridges
The effects of thermal loads on steel bridges are not well understood. Although thermal effects are discussed in the AASHTO specifications, the appropriateness of the recommended thermal gradients is questionable. Thermal effects on the bridges can impact the design of the steel superstructure, the …
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Seismic Response and Analytical Fragility Functions for Curved Concrete Box-Girder Bridges
Curved bridges are constructed to conform to geometric constraints resulting from traffic and structural restrictions. They are different from their straight counterparts since the response coupling in the longitudinal and transverse directions and rotation of the superstructure may lead to …
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Torsional Ground Motion Effects on the Seismic Response of Continuous Box-girder Highway Bridges
Highway bridges are particularly vulnerable to seismically-induced deformations and forces due to their complex dynamic characteristics. Therefore, many studies have been conducted to provide insight into their seismic response characteristics under various types of ground motions. Undoubtedly, …