Investigation of Fling-Step Effect on Mid-Rise R/C Buildings Subjected To Near Source Strong Motion


Abstract eng:
In the proximity of an active fault system, ground motions are significantly affected by the faulting mechanism, direction of rupture propagation relative to the site (e.g., forward directivity), as well as the possible static deformation of the ground surface which is associated with fling-step effects. These near-source outcomes cause most of the seismic energy from the rupture to arrive in a single coherent long-period pulse of motion. The failure of modern engineered structures observed within the near-fault region of the 1994 Northridge earthquake revealed the vulnerability of existing buildings against pulsetype ground motions. Additionally, the strong directivity effects during the 1999 Kocaeli, Duzce, and Chi-Chi earthquakes renewed attention on the consequences of near-fault ground motions on structures. This paper investigates the correlation between illustrious characteristics of near field ground motion Intensity Measures (IM) and the corresponding seismic response of reinforcement concrete (RC) frame buildings, by the use of Incremental Nonlinear Dynamic Analysis (IDA) method. Two in plan symmetric 10 and 15-story RC frames (as mid-rise buildings). Moreover, IDA has been used to assess the collapse capacity and expected earthquake damage level as a function of the spectral acceleration at the fundamental period of the building. Twenty eight bidirectional ground motions used to simulate the earthquake. The models designed for two different scenarios depending on the distance to the fault, (i.e. 14 near-fields and 14 far-fields ground motion) and applied along the structural axes of the buildings. The OpenSees software was used to conduct nonlinear structural evaluations. Numerical modeling showed that the RC buildings are under large deformation requirements in the presence of velocity pulses in a velocity time history. Moreover, the results highlighted some certain intensity measures which exhibited strong correlation with the seismic damage of RC models. However, the degree of correlation between those values and the seismic damage in near-fields depends on the vertical pulse of ground motion can have a great influence on the seismic response of a building when combined with a horizontal pulse.

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


Original version of the author's contribution as presented on USB, paper 936.:
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