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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 20 for “"p-delta"”.
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P-Delta effect for leg members of latticed communication towers.
Guyed Latticed Communication Towers are highly complex structures which are very difficult to model and analyze. Because of their geometric non-linearity, P-D effects are significant. To evaluate this, a sample guyed tower with one set of guys was modeled and linear and non-linear analyses were …
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Influence of intense ground motion on p-delta effect amplification
High intensity ground motion can cause significant deformations, which is the basis for additional second-order responses. This analysis uses two recorded ground motions for historical large earthquakes (Kocaeli and Tohoku), a sinusoidal curve, and a simulated ground motion based on the 1906 San …
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Implications of P-Delta analysis and LRFD of gable frames
Recent developments in the philosophy of structural steel design have led to design specifications that incorporate second-order geometric effects. The use of second-order elastic analysis (SOEA) in the design of structural frameworks may lead to more economically designed structures and increased …
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Risposta sismica fuori piano di strutture murarie: gli effetti P-Delta in un approccio a macro-elementi
… effetti del secondo ordine (cosiddetti effetti P-Delta P-Δ) in grado di descriver la risposta di rocking di muri in muratura soggetti a carichi fuori dal proprio piano. In accordo con la strategia a macro-elementi discreti, il modello proposto descrive un muro di muratura attraverso una mesh di …
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Comparison of P-Delta Analyses of Plane Frames Using Commercial Structural Analysis Programs and Current AISC Design Specifications
Several different approaches to determining second-order moments in plane frames were studied during this research. The focus of the research was to compare the moments predicted by four different commercially available computer analysis programs and the current design specification, the AISC LRFD …
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Nonlinear Dynamic Analysis of Structures with Hyperelastic Devices
… of varying content, and for two separate P-Delta cases of varying severity. Two sets of hyperelastic braces are investigated for their influence under the two ground motions and two P-Delta cases. Each scenario is analyzed using nonlinear dynamic analyses to investigate the response …
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Performance Prediction and Evaluation of Low Ductility Steel Moment Frames for Seismic Loads
… C collapsed due to story mechanism and high P-Delta moments. Therefore, it is recommended that WCSB design be restricted to 120 feet tall. All of the buildings with T-stub connections performed well except for the 3-story building in SDC D which exceeded the permanent residual drift limit. As …
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Development of a Comprehensive Linear Response History Analysis Procedure for Seismic Load Analysis
… orthogonal loading, solution techniques, P-Delta effects, modeling of the basement, and calculation of drifts are also studied in the context of linear response history analysis. The thesis concludes with suggested code language for linear response history analysis intended to be considered …
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Parameters Influencing Seismic Structural Collapse with Emphasis on Vertical Accelerations and the Possible Related Risks for New and Existing Structures in the Central and Eastern United States
… the yield strength, and the stability ratio (P-Delta effects). Then, three parameters were associated with the ground motions — the records themselves, the lateral ground motion scales, and the vertical ground motion scales. From the parameter study, it was found that the post-yield stiffness …
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Ο ΝΟΥΜΑΣ ΚΑΙ Η ΕΠΟΧΗ ΤΟΥ (1903-1931). ΓΛΩΣΣΙΚΟΙ ΚΑΙ ΙΔΕΟΛΟΓΙΚΟΙ ΑΓΩΝΕΣ
… AND MISTRIOTIS, AND CAUSED PROTESTS BY P. DELTA, P. VLASTOS AND OTHER FOLLOWERS OF THE POPULAR LANGUAGE. IN 1907 NOUMAS, A WELL KNOWN ORGAN OF THE DEMOTIC LANGUAGE WAS INFLUENCED BY SOCIAL IDEAS AND ATTEMPTED TO BALANCE BETWEEN ITS SOCIALIST AND NATIONALIST FRIENDS. THEESTABLISHMENT OF …
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Sensitivity Study on Modification of Vertical Distribution of Strength and Stiffness in Wood Shear Wall Building Models
… in this study. The analytical models include P-Delta effects and utilize the 10-parameter hysteresis CASHEW model. It is observed that the Parabolic strength distribution allows for dissipation of energy over the height of the building, has less collapse risk than other strength distributions …
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STUDIES OF DYNAMIC RESPONSE OF OFFSHORE GUYED TOWERS
… of the guying and foundation systems; (4) the P-Delta effects of the vertical loading; (5) the effects of variations in the values of the drag and inertia coefficients; and (6) the influence of the random phase angles used in the generation of the random sea. The response quantities examined are …
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Complete Mirror Pairs and Their Naive Stringy Hodge Numbers
… a to dual pair of nef-partitions</p><p>$\Delta=\Delta_1+\dotsb+\Delta_c$ and $\nabla=\nabla_1+\dotsb+\nabla_c$ a pair</p><p>of Calabi-Yau complete intersections</p><p>$(Y_{\Delta_1,\dotsc,\Delta_c},Y_{\nabla_1,\dotsc,\nabla_c})$ in Gorenstein Fano</p><p>toric varieties …
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Seismic Rehabilitation of Steel Concentrically Braced Frames Vulnerable to Soft-Story Failure Through Implementation of Rocking Cores
… yielding, brace buckling, brace rupture, and P-Delta effect. Eigenvalue analyses are first conducted to investigate the effect of RC on system modal properties. It is found that the added RC generally does not significantly change the fundamental period and therefore does not attract excessive …
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FOOTING FIXITY OF BRIDGE PIER WITH END-BEARING PILE FOUNDATION
… are used to check if the second-order effect (P-delta effect) needs to be considered. When large axial loaded compression members, like bridge piers, are under lateral load impacts, the rotation at the base of the pier may cause a significant effect on the lateral deflection of the pier. However, …
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Seismic Rehabilitation of Steel Moment Frames Vulnerable to Soft-Story Failures Through Implementation of Rocking Cores
… of member yielding, connection rupture, and P-Delta effect, and validated using published results. Eigenvalue analyses are conducted to investigate the effect of the RC on system modal properties. It is found that in general the added RC with practical stiffness value does not significantly …
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Development, Analysis and Testing of a Hybrid Passive Control Device for Seismic Protection of Framed Structures
… and aids in collapse prevention due to p-delta effects. The first phase of this work included characterization of high damping rubber compounds and analytical modeling of the HPCD concept. Experimental testing was completed to measure both the static and dynamic material properties of six …
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Nonlinear Analysis of Multistory Structures Using "NONLIN"
During the months I have been at Virginia Tech, I have experienced the most exciting time of my life. There are many persons who helped me to pursue my Master's degree. I would like to take this opportunity to express my appreciations to them. I would like to thank my advisor and committee …
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Analysis of the flow structure and reattachment over accelerating non-slender delta-wing planforms
<p>Delta wings are triangular-shaped lifting surfaces, and in past decades, they have been found to have important applications in maneuvering combat aircraft and supersonic aircraft. Slender, or high swept, delta wings have been widely studied in early investigations since they suffer less wave …
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A Comparative Study on Seismic Analysis Methods and the Response of Systems with Classical and Nonclassical Damping
… effects of negative lateral stiffness due to P-delta effects when the earthquake ground motions were too weak to induce sliding in the ring assemblies.</p>