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 30 for “"Flexural Stiffness"”.
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Behavior, strength and flexural stiffness of circular concrete columns reinforced with FRP bars and spirals/hoops under eccentric loading
La détérioration des structures en béton armé avec des barres d’armature d’acier peut être observée quotidiennement dans les régions à climat agressif. Le renforcement interne en polymères renforcés de fibres (PRF) a démontré sa faisabilité grâce à différents éléments structuraux en génie civil. …
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Beam-column connection flexural behavior and seismic collapse performance of concentrically braced frames
This dissertation investigates the flexural behavior of beam-column connections with gusset plates and their ability to improve the seismic collapse performance of concentrically braced frames. Previous experimental and field observations demonstrated that reserve lateral force-resisting capacity …
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Flexural Stiffnesses of and Dimensional Stability in Circular Quasi-isotropic Laminate Mirrors
… In this dissertation document, radial stiffness associated with stacking sequence effects in quasi-isotropic laminates (pi/n, where n=3, 4, and 6) and dimensional stability in the composite laminates are investigated numerically. The numerical results show that directional dependency of …
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An Algorithm and Methodology for Static Response Based Damage Detection in Structural Systems
… in three different structural types. Reduced flexural stiffness is detected in a steel moment frame, reduced cross sectional area is detected in a three dimensional truss, and lastly a combination of reduced flexural stiffness and reduced moment capacity of connections is detected in a three …
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Enhanced induced strain actuator performance through discrete attachment to structural elements
… memory alloy actuator wire) does not possess any flexural stiffness; and therefore, remains straight between the two attachment points. In the second implementation, the actuator (PZT's and electrostrictive) possesses flexural stiffness, and bends with the structure. The formulation and …
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Effects of Corrugations on Stiffness Properties of Composite Beams for Structural Applications
… research. While composite materials possess high stiffness and strength properties, the stiffness of composite laminates may be maximized by changing the geometry. By adding corrugations, the flexural stiffness is increased in one direction compared to the stiffness of a flat part with the same …
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Distributed Fibre Optic Sensing to Assess Support Reactions and Behaviour of Composite Steel Bridges
… from supports and loading points. An estimate of flexural stiffness was used to calculate support reactions, which were found to be inconsistent with results obtained from load cells. The error between DFOS calculated support reactions and load cell support reactions was then minimized to …
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Wing flexibility and design for animal flight
… to the control of wing deformations by measuring flexural stiffness (which incorporates both material and structural features) and quantifying patterns of supporting veins in 16 insect species. I find that average spanwise and chordwise stiffness scale strongly with wing size, and that spanwise …
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An incremental, non-linear displacement method for the elastic analysis of space trusses and plane frames
… the load at which the determinant of the stiffness matrix passes through zero. Chord shortening due to bowing of truss compression members which have an initial imperfection in straightness is included in the analysis by modifying the member axial stiffness term. Numerical examples of …
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ANALYSIS OF FRAME-CORE WALL BUILDINGS CONSIDERING EFFECTS OF AXIAL FORCE AND AXIAL DEFORMATION
… continua with equivalent shear rigidity, GA, and flexural stiffness, EIa. The effect of axial force is included in the derivation of shear stiffness. Charts are presented to facilitate the determination of shear rigidity for different levels of axial force ratio, P / Pcr , in practical range. Core …
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High modulus carbon fiber/titanium laminates
… applications. For structural applications where flexural stiffness and strength play the most important role, titanium's high cost can be a restrictive factor. The cost-effectiveness of the material can be increased by using it together with other less expensive high strength and low weight …
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Ultimate capacity of offshore platform conductor strings
… moment observed in the experimental tests. The flexural stiffness of the inner casing serves to strengthen the conductor system. Therefore, a design method that considers the strength of the outer conductor and the inner casings is recommended.
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Horizontal Stiffness of Wood Diaphragms
… investigation was conducted to study the stiffness of wood diaphragms. Currently there is no method to calculate wood diaphragm stiffness that can reliably account for all of the various framing configurations. Diaphragm stiffness is important in the design of wood framed structures to …
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Experimental Determination of the Stiffness and Strength of Continuity Tie Connections in Large Wood Roof Dipahragms, and Impact on the Collective Chord Model
… are stiff enough to engage and provide diaphragm flexural stiffness in a collective chord model. Four series of continuity tie assemblies using Simpson Strong-Tie steel connectors were tested to determine the stiffness of each assembly. The results found from testing were applied to an example …
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A study on cork-based plastic composite material
… appropriate due to extremely high in-plane and flexural stiffness to weight ratios. However, low structural freedom and high environmental burdens of core material in sandwich panels such as fiberglass, and chemically synthesized foams have retarded a wide use in various areas. Recently it has …
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Analysis of reinforced embankments and foundations overlying soft soils
… a membrane element developed which has radial stiffness but no flexural stiffness. The applicability of the program was verified by comparing analytical results to case histories of reinforced embankments and to model studies of reinforced foundations. A simplified procedure for computing the …
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Dynamic analysis of concrete coupled wall structures : a parametric study
… 15 degree opening could achieve the greatest stiffness. Same-size coupling beams could create DC in shorter buildings in Phase I, but the result was contradicted in Phase II testing. However, both Phases displayed the fact that shear stiffness played a more important role in affecting DC than …
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Prestressing Concrete with Shape Memory Alloy Fibers
… When cracks form in concrete members, the flexural stiffness of the member decreases and the deflection increases which increases the overall size of the member. Prestressing concrete remedies this problem by inducing a compressive stress in the concrete thereby reducing the net tension in …
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Prediction of Bending Properties of Lightly Modified Bamboo from Bambusa blumeana
… bending. Prediction methods for the strength and stiffness of LMB included the use of single variable correlations and best subset multiple regression model. From the single variable correlation and best fit multiple linear regression models, the strongest predictors for the bending strength and …
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ΔΙΕΡΕΥΝΗΣΗ ΤΗΣ ΑΝΕΛΑΣΤΙΚΗΣ ΣΕΙΣΜΙΚΗΣ ΣΥΜΠΕΡΙΦΟΡΑΣ ΠΟΛΥΟΡΟΦΩΝ ΚΤΙΡΙΩΝ ΑΠΟ ΟΠΛΙΣΜΕΝΟ ΣΚΥΡΟΔΕΜΑ
… INFLUENCE ON THERESPONSE WAS THE EFFECTIVE FLEXURAL STIFFNESS OF THE ELASTIC PART OF THE MODELS REPRESENTING THE HYSTERETIC BEHAVIOUR OF R/C MEMBERS; AMONG THE POST-YIELD STIFFNESS PARAMETERS, THE ONE DETERMINING THE SLOPE OF THE UNLOADING BRANCH INTHE MODIFIED TAKEDA MODEL WAS FOUND TO HAVE …
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