Low-cut Filter Frequency Quantification and Its Influence on Inelastic Response Spectrum

2021 ◽  
pp. 1-25
Author(s):  
Yabin Chen ◽  
Longjun Xu ◽  
Pangang Wu
Keyword(s):  
Response Spectrum ◽  
Inelastic Response ◽  
Filter Frequency

Inelastic Response of a Spectrum-Compatible Artificial Accelerogram

1989 ◽  
Vol 5 (3) ◽  
pp. 477-493 ◽  
Author(s):  
Michael E. Barenberg
Keyword(s):  
Response Spectrum ◽  
Ground Motions ◽  
Normalization Procedure ◽  
Target Response ◽  
Single Degree Of Freedom ◽  
Inelastic Response ◽  
Strong Ground Motions ◽  
Single Degree ◽  
Initial Frequency ◽  
Strong Ground

The validity of evaluating the inelastic response of a structure subjected to an artificial accelerogram in lieu of a suite of eight recorded ground motions is determined by analyzing the inelastic response of single-degree-of-freedom oscillators over a range of frequencies from 1.0 to 10.0 Hz. A normalization procedure to minimize the dispersion in the ductility response of the oscillators subjected to the recorded ground motions is investigated. The artificial accelerogram is derived by superimposing closely spaced sine waves in order to match a target response spectrum. The results show that the artificial accelerogram is expected to produce the same amount of damage as the average of the recorded strong ground motions for structures with an initial frequency of less than 5.0 Hz and close to the average for the entire suite of ground motions for structures with frequencies greater then 5.0 Hz.

Spectral Variability and Its Relationship to Structural Response Estimated from Scaled and Spectrum-Matched Ground Motions

2016 ◽  
Vol 32 (4) ◽  
pp. 2191-2205 ◽  
Author(s):  
A. E. Seifried ◽  
J. W. Baker
Keyword(s):  
Response Spectrum ◽  
Ground Motions ◽  
Structural Response ◽  
Degree Of Freedom ◽  
Structural Systems ◽  
Spectral Variability ◽  
Single Degree Of Freedom ◽  
Inelastic Response ◽  
Single Degree ◽  
Spectral Dispersion

Conditional spectral dispersion ( CSD) is a measure of response spectrum variability that implicitly characterizes the variety of spectral shapes within a suite of ground motions. It is used here to explain the discrepancy between median structural demands estimated from different suites of scaled and spectrum-matched ground motions. Performing response history analyses with spectrum-matched ground motions is known to result in unconservatively biased median demand estimates in some cases. Herein, several suites of scaled ground motions with equivalent median intensities and varying levels of CSD are selected. A single suite of spectrum-matched ground motions is also created. These records are used to analyze the responses of inelastic single-degree-of-freedom and first-mode-dominated multiple-degree-of-freedom structural systems. Collapse capacities are also examined. A consistent trend between CSD and resulting median responses indicates that the bias phenomenon can be fully explained by an asymmetric relationship between conditional spectral ordinates at periods affecting inelastic response.

Inelastic Higher-Mode Response in Reinforced Concrete Wall Structures

2015 ◽  
Vol 31 (3) ◽  
pp. 1493-1514 ◽  
Author(s):  
Domenico Pennucci ◽  
Timothy J. Sullivan ◽  
Gian Michele Calvi
Keyword(s):  
Response Spectrum ◽  
Fem Analysis ◽  
Future Research ◽  
Concrete Wall ◽  
Inelastic Response ◽  
Higher Modes ◽  
Ductility Demand ◽  
Modeling And Analysis ◽  
Closed Form Solutions ◽  
Wall Structures

This study presents the results of a nonlinear response-history (NLRH) investigation of cantilever and coupled wall systems, in which the contribution of higher modes to the dynamic response is significant. The limitations of the so-called reduced response spectrum analysis method to predict higher-mode inelastic response are identified and the reasons for its shortcomings are explained. Two procedures for the prediction of the inelastic response of higher modes are presented. The first method is based on the substitute structure method and requires only elastic modal analysis, making it particularly fit for traditional design purposes. The second method is based on structural dynamics closed-form solutions, and it does not require finite element method (FEM) analysis, making it particularly fit for simplified capacity design purposes. The approaches show very good agreement with the results of the NLRH investigation for any structural period, ductility demand, and coupling ratio. Future research should aim to further verify the new methods using more refined modeling and analysis approaches.

Seismic Evaluation Method of Piping Systems by Inelastic Response Spectrum Analysis: Part 1 — Response Analysis

2019 ◽  
Author(s):  
Ichiro Tamura ◽  
Michiya Sakai ◽  
Shinichi Matsuura ◽  
Ryuya Shimazu ◽  
Hiroaki Tamashiro ◽  
...  
Keyword(s):  
Spectrum Analysis ◽  
Evaluation Method ◽  
Response Spectrum ◽  
Vibration Test ◽  
Piping System ◽  
Analysis Method ◽  
Seismic Evaluation ◽  
Response Spectrum Analysis ◽  
Inelastic Response ◽  
Piping Systems

Abstract An inelastic response-spectrum-analysis method for multi-degree-of-freedom systems was proposed. The method has lower analysis loads and good outlook given by the inelastic response spectrum like the elastic response-spectrum-analysis method, and is not an equivalent-linearization method. We propose a seismic evaluation method of piping systems to conduct seismic design using the inelastic response-spectrum-analysis. In this paper, the inelastic analysis method of piping systems for the seismic evaluation method is proposed and applied to a benchmark analysis problem of a piping system vibration test. The analysis result is compared with the vibration test result of the piping system. They are consistent and applicability of the analysis to the piping system was confirmed.

Inelastic Response Spectrum for Seismic Soil Pile Structure Interaction

2016 ◽  
Vol 7 (2) ◽  
pp. 24-34
Author(s):  
Pavan Kumar Emani ◽  
Ritesh Kumar ◽  
Phanikanth Vedula
Keyword(s):  
Interaction Analysis ◽  
Response Spectrum ◽  
Response Spectra ◽  
Response Analysis ◽  
Pile Groups ◽  
Radiation Boundary Condition ◽  
Ground Response Analysis ◽  
Inelastic Response ◽  
Design Spectrum ◽  
Finite Element Software

Structures resting on deep foundations like pile groups are subjected to entirely different kind of vibrations than those resting on shallow foundations, due to the inherent variations in the ground motions experienced at various levels of the foundation. The present work tries to generate response spectrum for single-pile supported structures using inelastic dynamic soil-pile interaction analysis. In the numerical model, the soil nonlinearity includes both separation at soil-pile interface and the plasticity of the near-field soil. The radiation boundary condition is also incorporated in the form of a series of far-field dampers which absorb the out-going waves. Inelastic response spectra for the structure, represented by a SDOF system, is generated after applying the synthetic time histories compatible with design (input) response spectra (as per IS 1893:2002-part I) at the base of pile to investigate the effects of ground response analysis including kinematics and inertial interaction between soil- pile system. It is found that a structure supported by pile foundations should be designed for larger seismic forces/ accelerations than those obtained from the design spectrum given in IS 1893:2002-Part I. The verification of the developed MATLAB program is reported towards the end, using results from commercial Finite Element software ABAQUS.

Experimental and Numerical Studies of Ratcheting in a Pressurized Piping System Under Seismic Load

2015 ◽  
Vol 137 (3) ◽  
Author(s):  
A. Ravikiran ◽  
P. N. Dubey ◽  
M. K. Agrawal ◽  
G. R. Reddy ◽  
R. K. Singh ◽  
...  
Keyword(s):  
Comprehensive Evaluation ◽  
Response Spectrum ◽  
Three Dimensional ◽  
Seismic Loading ◽  
Seismic Load ◽  
Piping System ◽  
Inelastic Response ◽  
Design Procedures ◽  
Numerical Studies ◽  
Piping Systems

Rational seismic design procedures necessitate comprehensive evaluation of nuclear piping systems under large amplitude seismic loads. This comprehensive assessment requires accurate prediction of inelastic response of piping system till failure to ensure adequate margins for unexpected beyond design basis events. The present paper describes the details of experimental and numerical studies of inelastic response of pressurized piping system under seismic loading. Shake table test has been carried out on a three-dimensional stainless steel piping system under internal pressure and seismic load. The amplitude of base excitation has been increased till failure of the piping system. The tested piping system has been analyzed using iterative response spectrum (IRS) method for various levels of excitation. The comparison of numerical and experimental results is given in the paper.

Sign in / Sign up

Export Citation Format

Share Document