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 19 of 19 for “"box-beam"”.
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New Approach to Connections Between Members of Adjacent Box Beam Bridges
The adjacent box beam bridges (ABBB) are considered as an ideal solution for short to medium span bridges and for routes with low to medium traffic volumes. The ABBB system has been utilized and is popular in several states in the United States. However, this bridge system has long term durability …
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Optimization of composite box-beam structures including effects of subcomponent interaction
Minimum mass designs are obtained for a simple box beam structure subject to bending, torque and combined bending/torque load cases. These designs are obtained subject to point strain and linear buckling constraints. The present work differs from previous efforts in that special attention is payed …
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An Analytical Investigation of Natural Frequency for a Symmetric Composite Box-Beam with Thermal Effects
… the natural frequency of a symmetric composite box-beam subjected to temperature gradient. A set of coupled partial differential equations of motion is obtained by means of small defection theory and D'Alembert's method. The Smith and Chopra stiffness matrix is used in the governing equations of …
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A parametric study of the stress distribution in a four-celled box beam model of the ASR-21 Class Catamaran cross-structure.
Thesis: Ocean E., Massachusetts Institute of Technology, Department of Ocean Engineering, 1972
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Combined Loading of Composite Box-Beams with Linearized Differential Equations of Motion
… of arbitrarily laminated, cantilevered composite box-beam under static, transverse loading. Small deflections are assumed and the differential equations of motion have been linearized for ease of calculation. The Smith and Chopra stiffness matrix is used in the equations of motion, and software …
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VHPC Material Characterization and Recommendations for the Buffalo Branch Bridge Rehabilitation
Adjacent box beam bridges are economical bridge systems for accelerated bridge construction. The box beams are constructed at precast plants and are traditionally connected by a shear key filled with grout. This system is ideal for short spans with low clearance restrictions. However, due to the …
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Shear Strength Assessment of Corrosion-Damaged Prestressed Concrete Girders Repaired With CFRP
… corrosion is present in the end regions of the beams, failure of the girders will likely be in shear, which is a sudden failure mode and not the preferred limit state. Therefore, it is beneficial to study repair practices and their advantages, as repairs are often more cost-effective than …
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The finite element analysis of thin-walled box spine-beam bridges
… and experimental analysis of thin-walled box spine-beam bridges. Existing methods available for the analysis of spine-beam bridges have been reviewed, with special attention being paid to thin-walled box beam theories. A new approach combining the finite element technique and the …
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Use of Photogrammetry Aided Damage Detection for Residual Strength Estimation of Corrosion Damaged Prestressed Concrete Bridge Girders
… physical contact. The flexural capacities of a box beam and an I-beam estimated using strain compatibility analysis were validated with the actual capacities at failure sections determined from four destructive tests conducted by Al Rufaydah (2020). Along with the reduction in the …
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Optimization of composite structures by genetic algorithms
… design is applied to a more complex wing box-beam optimization problem. Tuning the genetic algorithm on this problem shows that, because the maximum length of a search is limited, the optimal population size does not grow with the size of the design space. If the probability of applying …
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Integrated structural design, vibration control, and aeroelastic tailoring by multiobjective optimization
… variables were derived for a finite element beam model of the structure and constant feedback gains determined by Independent Modal Space Control. Pareto optimal designs generated for a simple beam and a tetrahedral truss demonstrated the benefit of solving the integrated structural and …
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Beneath a great roof, airplanes and travelers will gather: an airport for the city of Washington D.C.
… concrete masts. From the masts, hollow concrete box beams are hung from a web of four hundred steel cables. The concrete box beam is formed by thirty foot long sections spanning from cable to cable. The beam is made of ten sections that cantilever three hundred feet out each side from the line of …
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Non-Contact Lap Splices in Dissimilar Concretes
… situation is found in the repair of adjacent box beam bridges and in the construction of inverted T-beam systems, among others. It is vital to understand whether the same mechanisms are present across a cold joint with two different types of concrete as are present in traditional non-contact …
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Development of a Magnetic Field Sensor System for Nondestructive Evaluation of Reinforcing Steel in Prestressed Concrete Bridge Members
… magnetic field induced in it. A field test of a box-beam bridge was conducted using both MMF and MFL detection techniques separately. This led to the realization of a comprehensive MMF-MFL electromagnet-sensor system for inspection of prestressed steel in concrete. A computer aided simulation …
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The theory of anisotropic thin- and thick-walled closed cross-section beams with coupled elastic deformations
… and accurate anisotropic closed-section beam theory has been developed for both thin- and thick-walled composite beams. In this theory transverse shear effects, both of the cross-section and of the beam walls, are taken into account. Torsional warping, both free and constrained as well as …
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Passive gust load alleviation through bend-twist coupling of composite beams on typical commercial airplane wings
… An analytical formulation of the orthotropic box beam bending stiffness matrix is derived by combining Euler-Bernoulli beam theory and classical laminated plate theory. The out-of-plane displacement due to the twist of the cross section is modeled by a bilinear warping function. The analytical …
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An Efficient Reduced Order Modeling Method for Analyzing Composite Beams Under Aeroelastic Loading
… cross-sections. An example of this might be a box-beam made up of 4 laminates, all of which are quasi-isotropic. This results in neglecting more complex designs that might yield a more effective solution, but require a greater analysis effort. The present work aims to show that the …
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Development of Innovative Hybrid Steel-Free Multi-Girder Bridge Deck System
… Glass Fibre Reinforced Polymer (GFRP) hollow box beam girders reinforced with Carbon FRP (CFRP) sheets on the bottom tensile face. An integrated cast-in-place Ultra-High Performance Concrete (UHPC) slab was placed overtop of the assembled girder system, with a two-part bond system used between …