Investigation of the relationship of seismic intensity measures and the accumulation of damage on concrete gravity dams using incremental dynamic analysis

In order to shorten the time of through-the-canopy-ejection, and to ensure pilot safely escape and survive. The application of linear cutting technique using miniature detonation cord( MDC) in through-the-canopy-ejection-system is proposed. A series of different kinds of MDC are designed. Firstly experimental study on the cutting process of the PMMA plate wiht MDC is carried out. Material of metal cover explosive types and the range of charge quantities are determined. Consequently the phenomena of spallation is observed, and the relationship between the cutting depth and charge quantities is obtained. For the comparison, the process of explosion cutting PMMA plate is simulated by means of nonlinear dynamic analysis code LS-DYNA. Spallation phenomena which occurs in the experiment, is also observed in the simulation. Simulation results present the relationship of cutting depth of PMMA plate versus charge linear density, which well agree with experimental ones.

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Mathematical models for the dynamic analysis of concrete gravity dams

Earthquake Engineering & Structural Dynamics ◽

10.1002/eqe.4290030304 ◽

1974 ◽

Vol 3 (3) ◽

pp. 249-258 ◽

Cited By ~ 22

Author(s):

Dixon Rea ◽

C-Y. Liaw ◽

Anil K. Chopra

Keyword(s):

Mathematical Models ◽

Dynamic Analysis ◽

Gravity Dams ◽

Concrete Gravity Dams

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Effect of foundation in dynamic analysis of concrete gravity dams

Journal of the Croatian Association of Civil Engineers ◽

10.14256/jce.713.2011 ◽

2012 ◽

Vol 64 (8) ◽

pp. 641-646

Keyword(s):

Dynamic Analysis ◽

Gravity Dams ◽

Concrete Gravity Dams

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Intensity Measure Based on a Smooth Inelastic Peak Period for a More Effective Incremental Dynamic Analysis

Applied Sciences ◽

10.3390/app10238632 ◽

2020 ◽

Vol 10 (23) ◽

pp. 8632

Author(s):

Juan Carlos Vielma ◽

Maria Cristina Porcu ◽

Nelson López

Keyword(s):

Dynamic Analysis ◽

Fourier Spectrum ◽

Linear Time ◽

Time History ◽

Incremental Dynamic Analysis ◽

Seismic Intensity ◽

Intensity Measure ◽

Peak Period ◽

History Analysis ◽

Concrete Building

The Incremental Dynamic Analysis (IDA) assesses the global collapse capacity of a structure by plotting its maximum inelastic response, obtained through a non-linear time-history analysis, versus the scaled intensity of different input earthquakes. The seismic intensity is often measured through the spectral acceleration at the fundamental elastic period. However, this can produce highly variable results. An alternative method is presented in this paper that relies on the elongated period, calculated either from the Fourier spectrum of the acceleration at a target building point (inelastic peak period) or from a smooth Fourier spectrum (inelastic smooth peak period). By referring to a reference reinforced concrete building and to a set of 10 spectrum-consistent earthquakes, the paper presents the results of a wide investigation. First, the variation in the elongated period as a function of the seismic intensity is discussed. Then, the effectiveness of the proposed method is assessed by comparing the IDA curves to those obtained through the elastic period or through approximate values of the elongated period given in the literature. The results show that the alternative IDA procedure generates curves with less-dispersed collapse thresholds. A statistical analysis shows significant improvements in the results when the inelastic smooth peak period is adopted.

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Fragility analysis of a subway station structure by incremental dynamic analysis

Advances in Structural Engineering ◽

10.1177/1369433216671319 ◽

2016 ◽

Vol 20 (7) ◽

pp. 1111-1124 ◽

Cited By ~ 13

Author(s):

Tong Liu ◽

Zhiyi Chen ◽

Yong Yuan ◽

Xiaoyun Shao

Keyword(s):

Dynamic Analysis ◽

Earthquake Engineering ◽

Seismic Vulnerability ◽

Probabilistic Method ◽

Incremental Dynamic Analysis ◽

Seismic Intensity ◽

Fragility Analysis ◽

Subway Station ◽

Limit States ◽

Station Structure

Fragility analysis constitutes the basis in seismic risk assessment and performance-based earthquake engineering during which the probability of a structure response exceeding a certain limit state at a given seismic intensity is sought to relate seismic intensity and structural vulnerability. In this article, the seismic vulnerability assessment of a subway station structure is investigated using a probabilistic method. The Daikai subway station was selected as an example structure and its seismic responses are modeled according to the nonlinear incremental dynamic analysis procedure. The limit states are defined in terms of the deformation and waterproof performance of the subway station structure based on the central column drift angle and the structural tension damage distribution obtained from the incremental dynamic analysis. Fragility curves were developed at those limit states and the probability of exceedance at the limit states of operational, slight damage, life safety, and collapse prevention was determined for the two seismic hazard levels. Results reveal that the proposed fragility analysis implementation procedure to the subway station structure provides an effective and reliable seismic vulnerability analysis method, which is essential for these underground structural systems considering their high potential risk during seismic events.

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