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Showing 1 to 20 of 21 for “"Natural period"”.

  1. Nonlinear site amplification functions for Central and Eastern North America

    Harmon, Joseph A.University of Illinois at Urbana-Champaign2017

    … velocity in the top 30 m of a site (VS30), site natural period, soil depth, and site nonlinearity which can be coupled with empirically-developed linear empirical amplification models. Including site natural period into the amplification function is shown to greatly improve estimates of site …

    uiuc Repository record

  2. Application of the latching control on a wave energy converter

    Shadman, MiladUniversidade Federal do Rio de Janeiro2017

    … power and absorption bandwidth when providing a natural period close to the predominant wave periods of the sea site. In addition, a wave-to-wire numerical model is developed to address the performance of the COPPE/Seahorse device in the nearshore Rio de Janeiro. The code is adapted to model a …

    brazil-uerj Repository record

  3. Estudo sobre a qualidade da resposta dinâmica do Método de Superposição dos Modos de Lanczos

    Ferreira, Cláudio BittencourtUniversidade Federal do Rio de Janeiro1990

    … submitted to large range of excitation periods is carried out. The unbalanced equation of motion, or residual, was evaluated from global parameters to address the response quality of a modal superposition method with load-dependent basis generated by Lanczos-type algorithms. The Lanczos …

    brazil-uerj Repository record

  4. OSCILLATING SURGE WAVE ENERGY CONVERTER GEOMETRY OPTIMIZATION FOR DIRECT SEAWATER DESALINATION

    McMorris, JasonEast Carolina University2023

    … used a significant wave height of 0.117m and a natural period of 1.68s. The system's power take-off (PTO) was also manipulated using different damping and stiffness coefficients to maximize the power generated from the OSWEC. The results of the wave simulations showed that the thinnest …

    ecu Repository record

  5. Seismic Response of Short Period Structures and the Development of a Self-Centering Truss Moment Frame with Energy Dissipating Elements for Improved Performance

    Darling, Scott ChristianVirginia Tech2012

    … that has been shown to work for structures with natural period greater than about 1.0 seconds, but does not hold true for shorter period structures. An additional consequence of this design methodology is that conventional seismic systems do not explicitly limit the amount of structural damage, …

    vt Repository record

  6. A Comparison of Optimized Nonlinear Time History Analysis and the Equivalent Lateral Forces Method for Brace Design

    Balling, Lukas2007

    … approximate formulas for the determination of natural period. These spectra are used to obtain seismic base shear, and the distribution of equivalent lateral forces. Yielding and drift criteria are then used to determine brace areas. This design procedure is referred to throughout the thesis as …

    byu Repository record

  7. A comparative study on the seismic performance of concrete and steel Diagrid structures

    Sun, MingzeMassachusetts Institute of Technology2015

    … better than concrete Diagrids in terms of natural period and controlling top drifts while concrete was tested to be better at controlling top accelerations. Comparing to outrigger and moment frame systems, both concrete and steel Diagrid structures were tested to be stiffer and more …

    mit Repository record

  8. Coupled simulation of loading and response of columns under extreme events

    Allahverdi, Navid H.

    … of blast loading in comparison with columns' natural period, column responses are mainly impulse-sensitive. The proposed equations in conjunction with SDOF model can be beneficial tools in blast design practices. Furthermore, the damage and failure modes of columns are studied. For columns …

    njit Repository record

  9. Numerical investigation of the performance of WEC integrated with vertical wall using CFD

    Yang, InjunUniversity of Strathclyde2024

    … particularly when it is considered within the natural period of the WEC. Furthermore, the application of latching control showed significant improvements in the WEC's performance, particularly in longer wave periods. However, it is important to note that the impact of the vertical wall becomes …

    strathclyde Repository record

  10. The influence of structural details, geotechnical factors and environs on the seismic response of framed structures.

    Madden, PatrickUniversity of Dundee2014

    … spectral response parameters, specifically the natural period and damping of equivalent single degree of freedom (SDOF) systems, which include the effects of frame rigidity, geometry and SSI.<br/>Dynamic centrifuge testing is also carried out in order to further validate the improved spectral …

    dundee Repository record

  11. Conventional and deep learning-based site amplification models for central and eastern North America

    Ilhan, OkanUniversity of Illinois at Urbana-Champaign2021

    … relationship, based only on the site natural period, which produces noticeably lower errors relative to those using time averaged shear wave velocity in the top 30 m of a site (VS30) is proposed for linear RS amplification, and all the linear RS functions are applied to FAS …

    uiuc Repository record

  12. Hydroelasticity of High-Speed Planing Craft Subject to Slamming Events: An Experimental and Numerical Investigation of Wedge Water Entry

    Ren, ZhongshuVirginia Tech2020

    … while the inertial effect elongates the natural period of the plate. Inspired by the experimental work, a computational framework was proposed to focus on the chine-unwetted phase. Several hydroelastic models can be obtained from this framework. The hydroelastic models were validated to …

    vt Repository record

  13. Development of Deep Shear Wave Velocity Profiles and an Approach to Generate Site Signature Consistent Pseudo Shear Wave Velocity Profiles in the Mississippi Embayment

    Himel, Ashraf Kamal2024

    … of the Memphis sand layer could affect the long period public infrastructures with 1 – 2 second natural period, such as highway bridges and skyscrapers. </p> <p>Utilizing the 24 deep VS profiles, velocity functions are developed for the geologic units found in the embayment. Pseudo site signature …

    arkansas Repository record

  14. The autecology of Widdringtonia Cedarbergensis in relation to its conservation management

    Manders, Patrick TimothyDepartment of Biological Sciences1985

    … in late summer or autumn coinciding with the natural period of seed release. This will maximise the germination and establishment of the seed released from both the survivors and the trees killed. Where deemed necessary in terms of adult mortality or seedling recruitment, seed should be sown …

    cape-town Repository record

  15. Wavelet-Based Characterization and Stochastic Modelling of Pulse-like Ground Motions on the Time-frequency Plane

    Lungu, A.City University London2014

    … from an engineering perspective the structural natural period is an appropriate and representative parameter for the definition of “pulses”. Overall, these analyses shed light into the challenges experienced when attempting to detect the pulse content in the accelerograms, in an effort to inform …

    city-london Repository record

  16. Seismic behaviours of adjacent building structures on liquefied soil

    Qi, ShengwenjunUniversity of Dundee2020

    … case is explained by changes in effective natural period and damping ratio, determine using measured transfer functions.<br/><br/>In terms of the influence of soil liquefiability (from fully non-liquefied to completely liquefied) on SSI effects, correlations of engineering demand parameters …

    dundee Repository record

  17. Ductility demands of filtered earthquakes on reinforced concrete frames

    Kuan, Steven Yet WuiUniversity of British Columbia1993

    … amplified acceleration, increased predominant period, and lengthened duration of strong shaking. Filtering of seismic waves through the soft soils in the Fraser River delta in British Columbia was investigated using the two-dimensional, dynamic analysis program SHAKE. It was found that the peak …

    ubc Repository record

  18. Improved Understanding of The 2018 Mw7.5 Palu Earthquake Using Local Earthquake Tomography and Numerical Ground Motion Simulation

    Sakti, Artadi Pria2026

    … local earthquake tomography (LET) and long-period ground motion simulations using three-dimensional (3-D) and basin models to analyze basin effects during the earthquake. For LET we have utilized P-wave arrival times recorded by both permanent and temporary seismograph networks covering the …

    aus-cath Repository record

  19. Improved Understanding of The 2018 Mw7.5 Palu Earthquake Using Local Earthquake Tomography and Numerical Ground Motion Simulation

    Sakti, Artadi Pria2026

    … local earthquake tomography (LET) and long-period ground motion simulations using three-dimensional (3-D) and basin models to analyze basin effects during the earthquake. For LET we have utilized P-wave arrival times recorded by both permanent and temporary seismograph networks covering the …

    anu Repository record

  20. Parametric Soil-Structure Modeling for Rapid Climatic Disaster Response

    Tripathi, RahulUniversity of Missouri--Kansas City2014

    … characterized by a single parameter of Tn (the natural period of the structure). The direct hazardous impacts considered in this thesis are extreme hydraulic forces and local foundation scouring that may ultimately cause failure of coastal structures (i.e. collapse). The criteria of success of …

    umkc Repository record

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