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Showing 1 to 20 of 30 for “"response spectra"”.
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An Evaluation of Scaling Methods for Earthquake Response Spectra
In current practice, design response spectra are scaled or normalized by the three peak ground motion values--displacement in the low, velocity in the intermediate, and acceleration in the high range of frequencies. In this study, alternative scaling factors are evaluated with the purpose of …
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Prediction of seismic design response spectra using ground characteristics
… For the groups thus defined, normalized response spectra are obtained for single-degree-of-freedom and massless oscillators. The effectiveness of the grouping scheme is examined by studying the variance of response quantities within each group. The implicit parameters of average frequency …
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Use of Response Spectra in the Dynamic Analysis of Systems With Two Degrees of Freedom
Made available in DSpace on 2014-12-05T17:37:08Z (GMT). No. of bitstreams: 1 6000239.pdf: 3509192 bytes, checksum: f9f56a928b734cd93bd4dcc65df0eda2 (MD5) Previous issue date: 1959
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Stochastic and seismic design response of linear and nonlinear structures
… calculating the stochastic and seismic design response of linear and nonlinear structures are presented. For linear structures, two approaches are developed: (1) the modified mode displacement approach for classically as well as non-classically damped structures, and (2) the generalized force …
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Regionally adaptable ground-motion Prediction Equations (GMPEs) for seismic hazard analysis
… design practices the GMPEs are often derived for response spectral ordinates (e.g., spectral acceleration) of a single degree of freedom (SDOF) oscillator. The functional forms of such GMPEs are based upon the concepts borrowed from the Fourier spectral representation of ground motion. This …
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Seismic Response of Structures with Flexible Floor Slabs by a Dynamic Condensation Approach
… is appropriate to describe the in-plane response of floors. For seismic excitations with vertical components, however, the flexibility of the floor slabs in the out-of-plane direction may play a significant role and it can result in an increase in the seismic response. The simplified …
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Design methodologies for the seismic retrofitting of bridges
… the region. Earthquake data is organized into response spectra, time histories, and frequency histories. Response spectra display the spectral displacement, velocity, and acceleration in terms of periods and are of the most interest to structural engineers. Once all of the data is gathered and …
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A Neural Network-Based Methodology for Generating Spectrum -Compatible Earthquake Accelerograms
… of the inverse mapping directly from the response spectra to earthquake accelerograms. A two-stage approach is used. In the first stage, a replicator neural network is used as a data compression tool. The replicator neural network compresses the vector of the discrete Fourier spectra of …
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Using Pulse R -Factors to Estimate Structural Response to Earthquake Ground Motions
… new method is developed for estimating inelastic response to strong ground motions. The method applies strength reduction (R) factors determined for a simple pulse to the elastic spectrum of the ground motions to estimate inelastic response spectra. Optimal pulse shapes and durations are …
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Um programa para o cálculo automático estático e dinâmico de sistemas de tubulações
… on nuclear power piping, principally seismic response-spectra and time history. The governing movement equations are transformed on normal coordinates and the solution is performed by step-by-step integration techniques. Discret or consistent mass matrices for straight and circularly curved …
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Seismic evaluation of the U3ax/bl landfill in the Area 3 Rwms, Nevada Test Site, Nevada
… evaluation, a seismic hazard analysis and a site response analysis were performed for the U3ax/b1 landfill which is located within the Area 3 Radioactive Waste Management Site of the Nevada Test Site. The site evaluation included application of the Spectral-Analysis-of-Surface-Waves method to …
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Seismic Response of Light Attachments to Buildings
… method is proposed to compute the maximum response of light secondary systems attached to buildings subjected to earthquakes. The method is derived by considering that a secondary system and its supporting primary structure form a single assembled system, and by applying a modified version …
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Quick methods of analysing earthquake forces on viaduct bridges having continuous decks and tall piers
… of a relatively quick method of analysis using response spectra and taking account of the effects of damping. The use of this method is illustrated by applying it to a mathematical model representing a real. bridge. Manual calculations are performed and refined by the application of Rayleigh's …
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Exact modal synthesis methods for seismic analysis of primary and multiply supported secondary systems
… approach for the calculation of the system response for any forcing function . For seismic analysis of combined primary and secondary structures, such as a main structure supporting piping or other auxiliary system, the combined structure is divided into two substructures. The …
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Probability of derailment under earthquake conditions
… elastic conditions, a method to obtain the power spectral density function for ground acceleration is presented and used to obtain acceleration and displacement response spectra.
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Inelastic seismic behavior of stiffening systems : multi-span simply-supported (MSSS) bridges
… stiffening parameters variations on the dynamic response of simple stiffening systems are presented. It is shown that on the average the displacement response is lower for stiffening systems, consistent with pushover analysis based on the seismic codes. However, considering many other damage …
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A method for the fatigue evaluation of riveted steel girder railway bridges
… in 1988 with the goal of collecting loading and response spectra for typical riveted girder railway bridges. The collected data were used to develop the new fatigue evaluation method or fatigue model. The fatigue model is a ""direct"" method of fatigue evaluation and has a basis in reliability …
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Seismic response analysis of multiply connected secondary systems
… to correlated inputs at several points. The response of the secondary systems is expressed as a combination of the dynamic, pseudo-static and cross response components. The dynamic part is associated with the inertial effect induced by the support accelerations. The pseudo-static part is due …
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Investigation of alternative seismic design procedures for standard buildings
… models and uniform hazard response spectra are used to evaluate structural performance. Deterministic design-checking equations are derived based on displacement-based performance criteria which are expressed in probabilistic terms. The deterministic design equations account …
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Comparing Optimized Perimeter Steel Bracing of Tall Buildings under Different Seismic Regions
… lateral frame systems for tall buildings from response spectra in different seismic regions rather than from an idealized design spectrum. The structural performance of the various optimized framing layouts produced were further verified through a nonlinear analysis, which indicated that they …
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