Seismic Performance of RC Structures Using an Improved Inelastic Analysis Method

2006 ◽  
Vol 324-325 ◽  
pp. 1021-1026
Author(s):  
Jin Ho Kim ◽  
Sin Chu Yang
Keyword(s):  
Ground Motions ◽  
Earthquake Hazard ◽  
Structural Performance ◽  
Analysis Method ◽  
Diagram Method ◽  
Rc Structures ◽  
Earthquake Ground Motions ◽  
Inelastic Analysis ◽  
First Approximation ◽  
Hazard Level

Inelastic analysis procedures may be useful as a first approximation for the seismic response of a structure. The Capacity Diagram Method procedure, which is based on R--T (Reduction-ductility-Period) relationships, is investigated to compare with the modified CDM procedure. The CDM procedure is applied to the example model, which is moment resistant RC frame. Two seismic hazard categories having exceedance probabilities of 2% in 50 years and 10% in 50 years earthquake ground motions have been selected for evaluating the performance of the example model. The performance objective of the example model is represented by the combination of a structural performance level and an earthquake hazard level.

scholarly journals Earthquake Shaking Hazard Estimates and Exposure Changes in the Conterminous United States

2015 ◽  
Vol 31 (1_suppl) ◽  
pp. S201-S220 ◽  
Author(s):  
Kishor S. Jaiswal ◽  
Mark D. Petersen ◽  
Ken Rukstales ◽  
William S. Leith
Keyword(s):  
United States ◽  
Total Population ◽  
Critical Infrastructure ◽  
Ground Motions ◽  
Earthquake Hazard ◽  
The United States ◽  
Annual Rate ◽  
Earthquake Hazards ◽  
Earthquake Ground Motions ◽  
The U.S

A large portion of the population of the United States lives in areas vulnerable to earthquake hazards. This investigation aims to quantify population and infrastructure exposure in places within the conterminous United States that are subjected to varying levels of earthquake ground motions by systematically analyzing the last four cycles of the U.S. Geological Survey's (USGS) National Seismic Hazard Models (published in 1996, 2002, 2008 and 2014). Using the 2013 LandScan data, we estimate the number of people who are exposed to potentially damaging ground motions (peak ground accelerations at or above 0.1 g). At least 28 million (~9% of the total population) may experience 0.1 g level of shaking at relatively frequent intervals [annual rate of 1 in 72 years or 50% probability of exceedance (PE) in 50 years], 57 million (~18% of the total population) may experience this level of shaking at moderately frequent intervals (annual rate of 1 in 475 years or 10% PE in 50 years), and 143 million (~46% of the total population) may experience such shaking at relatively infrequent intervals (annual rate of 1 in 2,475 years or 2% PE in 50 years). We also show that there are a significant number of critical infrastructure facilities located in high-earthquake-hazard areas (modified Mercalli intensity ≥ VII with moderately frequent recurrence interval).

Structure-Specific Scalar Intensity Measures for Near-Source and Ordinary Earthquake Ground Motions

2007 ◽  
Vol 23 (2) ◽  
pp. 357-392 ◽  
Author(s):  
Nicolas Luco ◽  
C. Allin Cornell
Keyword(s):  
Ground Motions ◽  
Linear Regression Analysis ◽  
Structural Performance ◽  
Intensity Measures ◽  
Earthquake Ground Motions ◽  
Long Period ◽  
Earthquake Records ◽  
Dynamic Analyses ◽  
Nonlinear Dynamic Analyses ◽  
A Site

Introduced in this paper are several alternative ground-motion intensity measures ( IMs) that are intended for use in assessing the seismic performance of a structure at a site susceptible to near-source and/or ordinary ground motions. A comparison of such IMs is facilitated by defining the “efficiency” and “sufficiency” of an IM, both of which are criteria necessary for ensuring the accuracy of the structural performance assessment. The efficiency and sufficiency of each alternative IM, which are quantified via (i) nonlinear dynamic analyses of the structure under a suite of earthquake records and (ii) linear regression analysis, are demonstrated for the drift response of three different moderate- to long-period buildings subjected to suites of ordinary and of near-source earthquake records. One of the alternative IMs in particular is found to be relatively efficient and sufficient for the range of buildings considered and for both the near-source and ordinary ground motions.

scholarly journals Robust Optimal Damper Placement of Nonlinear Oil Dampers With Uncertainty Using Critical Double Impulse

2021 ◽  
Vol 7 ◽  
Author(s):  
Kohei Fujita ◽  
Ryota Wataya ◽  
Izuru Takewaki
Keyword(s):  
Optimal Design ◽  
Structural Design ◽  
Structural Parameters ◽  
Ground Motions ◽  
Structural Safety ◽  
Structural Performance ◽  
Damping Force ◽  
Placement Problem ◽  
Earthquake Ground Motions ◽  
Robust Optimal Design

A new robust method for optimal damper placement is presented for building structures under the critical double impulse. Oil dampers are treated here as representative supplemental dampers to control the seismic response of high-rise buildings. Such oil dampers usually obey a bi-linear force-velocity relation in controlling the maximum damping force through a relief mechanism to avoid the occurrence of excessive design forces in surrounding frames. The influence of uncertainty in characteristics of those bi-linear oil dampers on building structural safety is investigated. For the efficient evaluation of dynamic performance, the resonant critical double impulse is used as the base input instead of actual earthquake ground motions. Since the critical double impulse is determined to maximize the input energy to the objective building by changing the second impulse timing, uncertainties in input ground motions can be taken into account in a robust manner. To consider these various uncertainties, the robustness function based on the Info-Gap model is used in the robust optimization to assess structural performance variations caused by various uncertainties in the structural design phase. In this paper, a new innovative objective function in the robust optimal damper placement problem is proposed to enhance the robustness of structural performance under the variation of structural parameters by comparing the robustness function of the robust design with that of an ordinary optimal damper placement without considering uncertainties. Numerical examples of the robust optimal design of linear and bi-linear oil damper placements are shown for 10-story and 20-story planar building frame models. Structural performances of the robust optimal design to the conventional design earthquake ground motions are examined to investigate the validity of using the critical double impulse in the structural design under uncertainties.

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