Reliable Displacement Response Spectra at Long Periods in the Near Field of Large Earthquakes

2013 ◽  
Vol 103 (4) ◽  
pp. 2534-2539 ◽  
Author(s):  
E. H. Javelaud ◽  
H. Morikawa
Keyword(s):  
Near Field ◽  
Response Spectra ◽  
Displacement Response ◽  
Displacement Response Spectra ◽  
Large Earthquakes

scholarly journals A Multi-Objective Ground Motion Selection Approach Matching the Acceleration and Displacement Response Spectra

2018 ◽  
Vol 10 (12) ◽  
pp. 4659 ◽  
Author(s):  
Yabin Chen ◽  
Longjun Xu ◽  
Xingji Zhu ◽  
Hao Liu
Keyword(s):  
Ground Motion ◽  
Response Spectrum ◽  
Structural Response ◽  
Response Spectra ◽  
Computationally Efficient ◽  
Ground Motion Selection ◽  
Displacement Response ◽  
Rc Frames ◽  
Selection Approach ◽  
Displacement Response Spectra

For seismic resilience-based design (RBD), a selection of recorded time histories for dynamic structural analysis is usually required. In order to make individual structures and communities regain their target functions as promptly as possible, uncertainty of the structural response estimates is in great need of reduction. The ground motion (GM) selection based on a single target response spectrum, such as acceleration or displacement response spectrum, would bias structural response estimates leading significant uncertainty, even though response spectrum variance is taken into account. In addition, resilience of an individual structure is not governed by its own performance, but depends severely on the performance of other systems in the same community. Thus, evaluation of resilience of a community using records matching target spectrum at whole periods would be reasonable because the fundamental periods of systems in the community may be varied. This paper presents a GM selection approach based on a probabilistic framework to find an optimal set of records to match multiple target spectra, including acceleration and displacement response spectra. Two major steps are included in that framework. Generation of multiple sub-spectra from target displacement response spectrum for selecting sets of GMs was proposed as the first step. Likewise, the process as genetic algorithm (GA), evolvement of individuals previously generated, is the second step, rather than using crossover and mutation techniques. A novel technique improving the match between acceleration response spectra of samples and targets is proposed as the second evolvement step. It is proved computationally efficient for the proposed algorithm by comparing with two developed GM selection algorithms. Finally, the proposed algorithm is applied to select GM records according to seismic codes for analysis of four archetype reinforced concrete (RC) frames aiming to evaluate the influence of GM selection considering two design response spectra on structural responses. The implications of design response spectra especially the displacement response spectrum and GM selection algorithm are summarized.

Prediction of elastic displacement response spectra in Europe and the Middle East

2007 ◽  
Vol 36 (10) ◽  
pp. 1275-1301 ◽  
Author(s):  
Sinan Akkar ◽  
Julian J. Bommer
Keyword(s):  
Middle East ◽  
Response Spectra ◽  
Elastic Displacement ◽  
Displacement Response ◽  
Displacement Response Spectra

Far-Source Long-Period Displacement Response Spectra in the Po and Venetian Plains (Italy) from 3D Wavefield Simulations

2011 ◽  
Vol 101 (3) ◽  
pp. 1055-1072 ◽  
Author(s):  
A. Vuan ◽  
P. Klin ◽  
G. Laurenzano ◽  
E. Priolo
Keyword(s):  
Response Spectra ◽  
Displacement Response ◽  
Long Period ◽  
Displacement Response Spectra

Generation of probabilistic displacement response spectra for displacement-based design

2004 ◽  
Vol 24 (2) ◽  
pp. 149-166 ◽  
Author(s):  
Jiong Guan ◽  
Hong Hao ◽  
Yong Lu
Keyword(s):  
Response Spectra ◽  
Displacement Response ◽  
Displacement Response Spectra ◽  
Displacement Based

Broadband (0.05 to 20 s) prediction of displacement response spectra based on worldwide digital records

2008 ◽  
Vol 12 (4) ◽  
pp. 453-475 ◽  
Author(s):  
Carlo Cauzzi ◽  
Ezio Faccioli
Keyword(s):  
Response Spectra ◽  
Displacement Response ◽  
Displacement Response Spectra

scholarly journals Relative displacement response spectra with pounding effect

2001 ◽  
Vol 30 (10) ◽  
pp. 1511-1538 ◽  
Author(s):  
Anat Ruangrassamee ◽  
Kazuhiko Kawashima
Keyword(s):  
Response Spectra ◽  
Relative Displacement ◽  
Displacement Response ◽  
Displacement Response Spectra

Impact of Damping Scaling Factors on Direct Displacement-Based Design

2016 ◽  
Vol 32 (2) ◽  
pp. 843-859 ◽  
Author(s):  
Cuiyan Kong ◽  
Mervyn J. Kowalsky
Keyword(s):  
Response Spectra ◽  
Equivalent Linearization ◽  
Base Shear ◽  
Limit States ◽  
Scaling Factors ◽  
Equivalent Viscous Damping ◽  
Direct Displacement Based Design ◽  
Displacement Response Spectra ◽  
Performance Limit States ◽  
Displacement Based

Damping scaling factors (DSFs) play an important role in direct displacement-based design (DDBD) as they provide a means to establish displacement response spectra for damping values beyond 5%. Response spectra for multiple damping values are needed for DDBD as the approach relies on equivalent linearization, expressed in the form of effective stiffness and equivalent viscous damping, to establish design forces for prescribed performance limit states. In the past, DSFs based on the Eurocode have been employed for DDBD; however, recent research has resulted in more robust DSF models. This paper examines the accuracy of the current DSF equation used in DDBD across the parameters that are important for structural design. A nonlinear regression analysis is performed based on the data obtained by the Rezaeian et al. (2014) model, and a base shear adjustment factor (SAF) is proposed for application to the DDBD base shear equation.

Static Application of Transient Hydrodynamic Loads on Vessel Internal Structures As a Result of Pulse Jet Mixer Overblow: Low-Frequency Loads

2020 ◽  
Author(s):  
Rafael Garcilazo ◽  
Brian Fant ◽  
Robert Blevins
Keyword(s):  
Waste Treatment ◽  
Low Frequency ◽  
Response Spectra ◽  
Liquid Density ◽  
Choked Flow ◽  
Internal Structures ◽  
Displacement Response Spectra ◽  
Conservation Of Momentum ◽  
Operation Results ◽  
Pulse Jet

Abstract At the Hanford Waste Treatment and Immobilization Plant (WTP), various vessels are designed to be agitated with internal pulse jet mixers (PJMs) in order to provide a means of mixing with no moving parts local to the vessel. PJMs are operated by use of an applied vacuum to draw liquid in followed by motive air to force liquid out (while not completely discharging all the liquid). This continual operation results in mixing of the vessel contents. In off-normal conditions, PJMs may completely discharge resulting in air rapidly injected into the vessel (PJM overblow). An evaluation is complete to determine the statically applied transient Rayleigh-Plesset bubble loads resulting from PJM overblow on the vessel’s internal submerged structures. The low-frequency bubble loads on internal structures is determined via analysis of overblow test data, application of the Rayleigh-Plesset equation based on bubble pressure, PJM nozzle critical flow ratios, conservation of momentum, the relative equation of motion of a submerged non-fixed structure subject to both relative drag and relative acceleration, non-flow boundary conditions, use of a displacement-response spectra, and Hooke’s Law. This theoretical Rayleigh-Plesset bubble loads model accounts for various vessel and internal submerged structure designs and different operational states: PJM cavity pressure, liquid density, depth of submerged bubble, and both choked or non-choked flow through the PJM nozzle.

Near-Fault Directivity Spectrum for Nuclear Structure Design on Rock Site

2011 ◽  
Vol 243-249 ◽  
pp. 3820-3823
Author(s):  
Long Jun Xu ◽  
Sheng Chao Yang
Keyword(s):  
Nuclear Structure ◽  
Ground Motions ◽  
Response Spectra ◽  
Structure Design ◽  
Design Spectra ◽  
Directivity Effect ◽  
Near Fault ◽  
Forward Directivity ◽  
Rock Site ◽  
Large Earthquakes

This study is aimed at evaluating the safety implications of near-fault directivity effect on nuclear structure and facilities designed according to the Chinese code. To this end, a set of near-fault ground motions at rock site with typical forward-directivity effect is examined with emphasis on several key parameters and response spectra. The bi-normalized response spectra in terms of different corner periods are utilized to derive nuclear design spectra. It was concluded that nuclear design spectra on rock site derived from typical directivity records are significantly influenced by both magnitude and distance. The nuclear design spectra specified in the code need to be adjusted to reflect the near-fault directivity effect of large earthquakes.

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