• Title, Summary, Keyword: randomness in yield strength

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Influence of the Random Yield Strength Distribution on the Behaviour Factor of Steel Structures (임의항복강도의 분포가 강구조물의 거동계수에 미치는 영향)

  • Kook, Seung Kyu
    • Journal of Korean Society of Steel Construction
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    • v.9 no.2
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    • pp.229-235
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    • 1997
  • In order to check the influence of the randomness in yield strengths on the energy dissipation capacity of steel structures, behaviour factors applied for the "Response Spectrum Method" and their distributions are determined in this study with 7 steel framed models. Also 4 artificial accelerograms simulated with a given spectrum are applied to check the influence of the randomness in seismic action on the behviour factor. To execute numerous time-step calculations for the investigation a time-step analysis method is developed and applied after the reliability estimation to determine the action effects.

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Probabilistic Approach to Predicting Residual Longitudinal Strength of Damaged Double HullVLCC

  • Huynh, Van-Vu;Lee, Seung-Hyun;Cho, Sang-Rai
    • Journal of Ocean Engineering and Technology
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    • v.25 no.3
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    • pp.1-10
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    • 2011
  • This paper estimates the residual longitudinal strength of a damaged double hull VLCC (Very Large Crude Carrier) under combined vertical and horizontal bending moments using Smith's method. The damage estimated in this study occurred due to collision or grounding accidents. The effects of the randomness of the yield stress, plate thickness, extent of damage, and the combination of these three parameters on the ultimate hull girder strength were investigated. Random variables were generated by a Monte Carlo simulation and applied to the double hull VLCC described by the ISSC (International Ship and Offshore Structures Congress) 2000 report.

Statistical properties of the maximum elastoplastic story drift of steel frames subjected to earthquake load

  • Li, Gang
    • Steel and Composite Structures
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    • v.3 no.3
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    • pp.185-198
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    • 2003
  • The concept of performance based seismic design has been gradually accepted by the earthquake engineering profession recently, in which the cost-effectiveness criterion is one of the most important principles and more attention is paid to the structural performance at the inelastic stage. Since there are many uncertainties in seismic design, reliability analysis is a major task in performance based seismic design. However, structural reliability analysis may be very costly and time consuming because the limit state function is usually a highly nonlinear implicit function with respect to the basic design variables, especially for the complex large-scale structures for dynamic and nonlinear analysis. Understanding statistical properties of the structural inelastic deformation, which is the aim of the present paper, is helpful to develop an efficient approximate approach of reliability analysis. The present paper studies the statistical properties of the maximum elastoplastic story drift of steel frames subjected to earthquake load. The randomness of earthquake load, dead load, live load, steel elastic modulus, yield strength and structural member dimensions are considered. Possible probability distributions for the maximum story are evaluated using K-S test. The results show that the choice of the probability distribution for the maximum elastoplastic story drift of steel frames is related to the mean value of the maximum elastoplastic story drift. When the mean drift is small (less than 0.3%), an extreme value type I distribution is the best choice. However, for large drifts (more than 0.35%), an extreme value type II distribution is best.