scholarly journals Incremental Dynamic Analysis of Koyna Dam under Repeated Ground Motions

2018 ◽  
Vol 318 ◽  
pp. 012021 ◽  
Author(s):  
Nik Zainab Nik Azizan ◽  
Taksiah A. Majid ◽  
Fadzli Mohamed Nazri ◽  
Damodar Maity ◽  
Junaidah Abdullah
Keyword(s):  
Dynamic Analysis ◽  
Ground Motions ◽  
Incremental Dynamic Analysis

Seismic Performance of Jacket Type Offshore Platforms Through Incremental Dynamic Analysis

2010 ◽  
Vol 132 (3) ◽  
Author(s):  
Behrouz Asgarian ◽  
Azadeh Ajamy
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Behavior ◽  
Earthquake Engineering ◽  
Dynamic Instability ◽  
Ground Motions ◽  
Nonlinear Behavior ◽  
Incremental Dynamic Analysis ◽  
Offshore Platforms ◽  
Strong Ground Motions ◽  
Strong Ground

Fixed offshore platforms in seismic active areas may be subjected to strong ground motions, causing the platform to undergo deformation well into the inelastic range. In this paper, incremental dynamic analysis (IDA) of jacket type offshore platforms subjected to earthquake was performed in order to study the linear and nonlinear dynamic behavior of this type of structures. IDA is a parametric analysis method that has been recently presented to estimate structural performance under seismic loads. By using incremental dynamic analysis of jacket type offshore platforms, the assessment of demand and capacity can be carried out. The method was used to predict nonlinear behavior of three newly designed jacket type offshore platforms subjected to strong ground motions. The engineering demand parameters of the platforms in terms of story drifts and intermediate elevation maximum displacement for different records were compared. This method was used for the performance calculations (immediate occupancy, collapse prevention, and global dynamic instability) needed for performance-based earthquake engineering of the above mentioned platforms. Two different behaviors were observed for the third platform in the X and Y directions. Particular attention has to be paid for the seismic design of this kind of platform. The results of jacket type offshore platforms incremental dynamic analysis shows that the method is a valuable tool for studying dynamic behavior in a nonlinear range of deformation. Because of high uncertainty in the nonlinear behavior of this type of structures, it is recommended to use this method for the assessment and requalification of existing jacket type offshore platforms subjected to earthquake.

scholarly journals Bidirectional Energy-based Pushover Procedure as a Fast Approach to Establish Approximate IDA Curves under Biaxial Seismic Excitations: An Evaluation for Medium- and High-rise Buildings

2021 ◽  
Author(s):  
Sahman Soleimani ◽  
Abdolreza Sarvghad Moghadam ◽  
Armin Aziminejad
Keyword(s):  
Dynamic Analysis ◽  
Ground Motions ◽  
Structural Models ◽  
Incremental Dynamic Analysis ◽  
Seismic Excitations ◽  
High Rise ◽  
Asymmetric Buildings ◽  
Fast Approach ◽  
Unique Approach ◽  
Similar Accuracy

Abstract Bidirectional energy-based pushover (BEP) procedure is expanded in this paper to predict approximate incremental dynamic analysis (IDA) results of medium- and high-rise structures. BEP is a unique approach in the sense that it provides approximate IDA curves under the simultaneous effect of two horizontal components of ground motions and is applicable to both symmetric- and asymmetric-plan buildings. The method has already proved to be useful in low-rise buildings, and this study aims to evaluate its suitability for mid- and high-rise structures. Six structural models were considered in this evaluation in two groups of 9- and 20-story buildings, with each group consisting of a symmetric, a one-way asymmetric, and a two-way asymmetric-plan building. The results revealed that the method was sufficiently accurate to provide approximate IDA curves for all structural models. The method had similar accuracy in the asymmetric models as it did in the symmetric models, although the accuracy slightly decreased as the height of the building increased. BEP also provided good estimates of the demands in both ‘flexible’ and ‘stiff sides’ of the asymmetric buildings as well as the demands over the height of the buildings.

scholarly journals An approach to quantify the influence of ground motion uncertainty on elastoplastic system acceleration in incremental dynamic analysis

2017 ◽  
Vol 20 (11) ◽  
pp. 1744-1756 ◽  
Author(s):  
Peng Deng ◽  
Shiling Pei ◽  
John W. van de Lindt ◽  
Hongyan Liu ◽  
Chao Zhang
Keyword(s):  
Dynamic Analysis ◽  
Ground Motion ◽  
Earthquake Engineering ◽  
Structural Response ◽  
Incremental Dynamic Analysis ◽  
Degree Of Freedom ◽  
Maximum Acceleration ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Performance Based Earthquake Engineering

Inclusion of ground motion–induced uncertainty in structural response evaluation is an essential component for performance-based earthquake engineering. In current practice, ground motion uncertainty is often represented in performance-based earthquake engineering analysis empirically through the use of one or more ground motion suites. How to quantitatively characterize ground motion–induced structural response uncertainty propagation at different seismic hazard levels has not been thoroughly studied to date. In this study, a procedure to quantify the influence of ground motion uncertainty on elastoplastic single-degree-of-freedom acceleration responses in an incremental dynamic analysis is proposed. By modeling the shape of the incremental dynamic analysis curves, the formula to calculate uncertainty in maximum acceleration responses of linear systems and elastoplastic single-degree-of-freedom systems is constructed. This closed-form calculation provided a quantitative way to establish statistical equivalency for different ground motion suites with regard to acceleration response in these simple systems. This equivalence was validated through a numerical experiment, in which an equivalent ground motion suite for an existing ground motion suite was constructed and shown to yield statistically similar acceleration responses to that of the existing ground motion suite at all intensity levels.

Seismic capacity estimation of a reinforced concrete containment building considering bidirectional cyclic effect

2018 ◽  
Vol 22 (5) ◽  
pp. 1106-1120
Author(s):  
Zhi Zheng ◽  
Changhai Zhai ◽  
Xu Bao ◽  
Xiaolan Pan
Keyword(s):  
Reinforced Concrete ◽  
Dynamic Analysis ◽  
Geometric Mean ◽  
Pushover Analysis ◽  
Incremental Dynamic Analysis ◽  
Dissipated Energy ◽  
Seismic Capacity ◽  
Capacity Estimation ◽  
Earthquake Intensity ◽  
Static Pushover Analysis

This study serves to estimate the seismic capacity of the reinforced concrete containment building considering its bidirectional cyclic effect and variations of energy. The implementation of the capacity estimation has been performed by extending two well-known methods: nonlinear static pushover and incremental dynamic analysis. The displacement and dissipated energy demands are obtained from the static pushover analysis considering bidirectional cyclic effect. In total, 18 bidirectional earthquake intensity parameters are developed to perform the incremental dynamic analysis for the reinforced concrete containment building. Results show that the bidirectional static pushover analysis tends to decrease the capacity of the reinforced concrete containment building in comparison with unidirectional static pushover analysis. The 5% damped first-mode geometric mean spectral acceleration strongly correlates with the maximum top displacement of the containment building. The comparison of the incremental dynamic analysis and static pushover curves is employed to determine the seismic capacity of the reinforced concrete containment building. It is concluded that bidirectional static pushover and incremental dynamic analysis studies can be used in performance evaluation and capacity estimation of reinforced concrete containment buildings under bidirectional earthquake excitations.

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