scholarly journals 70%-Damped Spectral Acceleration as a Ground Motion Intensity Measure for Predicting Highly Nonlinear Response of Structures

2019 ◽  
Vol 35 (2) ◽  
pp. 589-610 ◽  
Author(s):  
Kenny Buyco ◽  
Thomas H. Heaton
Keyword(s):  
Ground Motion ◽  
Nonlinear Response ◽  
Spectral Acceleration ◽  
Intensity Measure ◽  
Steel Moment Frame ◽  
Intensity Measures ◽  
Frame Building ◽  
Highly Nonlinear ◽  
Wide Range ◽  
Ground Motion Intensity Measure

We investigate 70%-damped spectral acceleration, Sa70%( T), as a ground motion intensity measure for predicting maximum interstory drift ratios of 0.03, 0.06, and 0.1 as well as collapse. We perform incremental dynamic analysis with 50 ground motions on 22 steel moment frame building models with heights of 3, 9, and 20 stories. We find that if T1 ≤ T ≤ 2 T1, Sa70%( T) is efficient and usually sufficient for the considered levels of highly nonlinear response. Sa70%(1.5 T1) is generally an efficient choice. We find that Sa70%( T) is similar to average spectral acceleration, Saavg, in many ways, as both intensity measures emphasize a wide range of periods in a ground motion when compared to Sa5%( T1). Sa70%( T) is equivalent to the peak of a ground motion's low-pass filtered acceleration, and this interpretation may be useful for estimating the potential of a ground motion to elicit a highly nonlinear response.

A spectral-acceleration-based combination-type earthquake intensity measure for high-rise stack-like structures

2019 ◽  
Vol 23 (7) ◽  
pp. 1350-1366 ◽  
Author(s):  
Yikun Qiu ◽  
Changdong Zhou ◽  
Siha A ◽  
Guangwei Zhang
Keyword(s):  
Ground Motion ◽  
Ground Motions ◽  
Spectral Acceleration ◽  
Intensity Measure ◽  
Earthquake Intensity ◽  
Intensity Measures ◽  
Higher Modes ◽  
High Rise ◽  
Near Fault ◽  
Period Elongation

Ground motion intensity measures are of great importance for the seismic design of structures. A well-chosen intensity measure will reduce the detailed ground motion record selection effort for the nonlinear dynamic structural analyses. In this article, a spectral-acceleration-based combination-type earthquake intensity measure is presented. This intensity measure considers the higher modes effect and period elongation effect due to nonlinear deformation at the same time. The modal mass participation factors are determined to take weighting coefficients and the product of elastic first-mode period T1 and a constant C is expressed to represent the elongated period. Therefore, the proposed intensity measure is a combination of earthquake ground motion characteristics, elastic structural responses, higher modes participation, and the period elongation effect due to inelastic structural behaviors. Four three-dimensional models of reinforced concrete stack-like structures including a 240 m-high chimney, a 180 m-high chimney, a 120 m-high chimney, and a 42.3 m-high water tower are established and analyzed in ABAQUS to investigate the correlation between the intensity measure and the maximum curvatures under 44 far-field ground motions and 28 near-fault ground motions with a pulse-like effect. With the optimal vibration modes and the proper period elongation coefficient, the efficiency of the introduced intensity measure is compared with the other 15 intensity measures. The results indicate that the proposed intensity measure is believed to be a good choice for high-rise stack-like structures, especially under the near-fault ground motions with pulse-like effect.

scholarly journals Probabilistic seismic hazard analysis using a new ground motion intensity measure

DYNA ◽  
2016 ◽  
Vol 83 (195) ◽  
pp. 206-215 ◽  
Author(s):  
Robespiere Chávez López ◽  
Edén Bojórquez-Mora
Keyword(s):  
Seismic Hazard ◽  
Ground Motion ◽  
Hazard Analysis ◽  
Probabilistic Seismic Hazard Analysis ◽  
Seismic Hazard Analysis ◽  
Probabilistic Seismic Hazard ◽  
Intensity Measure ◽  
Intensity Measures ◽  
First Time ◽  
Ground Motion Intensity Measure

The main objective of this work is to compute the probabilistic seismic hazard analysis for a region of Mexico using a new ground motion intensity measure which is based on the spectral acceleration and a parameter proxy of the spectral shape named Np. The motivation of using this new ground motion intensity measure is because recently it has demonstrated its potential in predicting the response of buildings subjected to earthquakes. In fact, it was demonstrated that intensity measures based on Np are more efficient compared with other parameter of the literature. It is important to mention that this is the first time that a probabilistic seismic hazard analysis is performed using this new intensity measurement.

A new ground motion intensity measure I B

2017 ◽  
Vol 99 ◽  
pp. 97-107 ◽  
Author(s):  
Edén Bojórquez ◽  
Robespierre Chávez ◽  
Alfredo Reyes-Salazar ◽  
Sonia E. Ruiz ◽  
Juan Bojórquez
Keyword(s):  
Ground Motion ◽  
Intensity Measure ◽  
Ground Motion Intensity Measure

Study of Dispersion of the Ground Motion Intensity Measure of R/C Frame Minaret

2017 ◽  
Vol 1 (1) ◽  
pp. 24-33
Author(s):  
Mamdooh Ali Abdullah Al-baadani ◽  
Mohammed Al-Shameri
Keyword(s):  
Ground Motion ◽  
Intensity Measure ◽  
Ground Motion Intensity Measure

Ground Motion Intensity Measures for Liquefaction Hazard Evaluation

2006 ◽  
Vol 22 (2) ◽  
pp. 413-438 ◽  
Author(s):  
Steven L. Kramer ◽  
Robert A. Mitchell
Keyword(s):  
Ground Motion ◽  
Earthquake Engineering ◽  
Ground Motions ◽  
Excess Pore Pressure ◽  
Hazard Evaluation ◽  
Peak Acceleration ◽  
Intensity Measure ◽  
Arias Intensity ◽  
Intensity Measures ◽  
Liquefaction Hazard

The requirements of performance-based earthquake engineering place increasing importance on the optimal characterization of earthquake ground motions. With respect to liquefaction hazard evaluation, ground motions have historically been characterized by a combination of peak acceleration and earthquake magnitude, and more recently by Arias intensity. This paper introduces a new ground motion intensity measure, CAV5, and shows that excess pore pressure generation in potentially liquefiable soils is considerably more closely related to CAV5 than to other intensity measures, including peak acceleration and Arias intensity. CAV5 is shown to be an efficient, sufficient, and predictable intensity measure for rock motions used as input to liquefaction hazard evaluations. An attenuation relationship for CAV5 is presented and used in an example that illustrates the benefits of scaling bedrock motions to a particular value of CAV5, rather than to the historical intensity measures, for performance-based evaluation of liquefaction hazards.

Simplified Method of Isolated Structure Collapse Capacity Part, (I): Ground Motion Intensity Measure

2013 ◽  
Vol 275-277 ◽  
pp. 1466-1470
Author(s):  
Yang Liu ◽  
Wen Guang Liu ◽  
Wen Fu He ◽  
Qiao Rong Yang
Keyword(s):  
Correlation Coefficient ◽  
Ground Motion ◽  
Ground Motions ◽  
Near Field ◽  
Far Field ◽  
Intensity Measure ◽  
Maximum Deformation ◽  
Average Value ◽  
Short Period ◽  
Ground Motion Intensity Measure

The equivalent velocity spectrum as a new ground motion intensity measure (IM) characterization parameter is proposed in this paper. 44 far field ground motions and 20 near-field high-speed pulse seismic waves were used for single-degree-freedom (SDOF) nonlinear time history analysis, respectively. The correlations between five IMs and maximum deformation for SDOF at various periods and different yield coefficients were analyzed. The results show that for the structures with medium-to-long period, the correlation coefficient average value of the proposed equivalent speed and maximum deformation is more than 0.6, and maximum of those is more than 0.9. The correlation coefficient average value by using the proposed equivalent speed under far field ground motions is more than those under near field ground motions. The P-delta effect on the correlation coefficients between proposed IM for the structures with medium-to-short period is significant

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