Collapse Assessment of High-Rise RC Structures Under Stochastic Earthquake Excitations


Abstract eng:
Reinforced concrete (RC) structures induced by extreme earthquakes will experience a strong nonlinear state which may cause partial or overall collapse. Meanwhile, the corresponding nonlinear process might be conspicuously influenced by the randomness stemmed from the ground motions. Although rapid progresses have been made in the numerical simulation techniques during the past decades, the addressing of randomness propagation in the collapse analyses up till now remains challenging. To provide knowledge beyond the conventional engineering insights, attention is focused on a comprehensive approach towards the stochastic seismic collapse analysis and the reliability assessment for large complex RC structures in this paper. Of which three key notions are emphasized: the refined finite element modeling and analysis aspects, a physical random ground motion model, and an energy-based structural collapse criterion. The softening of concrete material which substantially contributes to the collapses of the RC structures is modeled by a concrete stochastic damage constitutive model with a physical damage evolution law. And the dynamic equations of motion in the finite element analysis are solved by an explicit integration algorithm. The physical random ground motion model is introduced to describe the stochastic properties of the earthquake ground motions. Then the collapse-resistance performance of a certain RC structure can be quantitatively evaluated based on the probability density evolution method (PDEM) combining with the proposed energy-based collapse criterion. Numerical results in terms of a prototype RC frame-shear wall structure indicate that the randomness from ground motions dramatically affects the collapse behaviors of the structure, and even leads to entirely different collapse modes. Thus, it is of great significance to investigate the coupling effect of the damage evolution and the randomness propagation in collapse analysis and assessment of structures. The above integrated methodology gives rise to a new perspective to gain better understanding of the anti-collapse design and collapse prediction of large complex RC buildings.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


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