Effects of near-fault ground motions and equivalent pulses on multi-story structures

Sehhati, Reza; Rodríguez-Marek, Adrián; ElGawady, Mohamed A.; Cofer, William F.

doi:10.1016/j.engstruct.2010.11.032

Cited by 188 publications

(94 citation statements)

References 14 publications

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“…It is well known that rocking structures are also particularly vulnerable to long-period ground motions and more precisely, to the persistence of the pulse (Ishiyama 1984;Spanos and Koh 1984;Augusti and Sinopoli 1992;Manos and Demosthenous 1996;Konstantinidis and Makris 2005;Manos et al 2013). In tall buildings, which are similarly vulnerable to long periods, the Peak Ground Velocity (PGV) was found to be a more efficient IM compared to the Peak Ground Acceleration (PGA) or Spectral acceleration (Sa) (Sehhati et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Efficiency of alternative intensity measures for the seismic assessment of monolithic free-standing columns

Pappas

Sextos

Porto

et al. 2016

Bull Earthquake Eng

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This paper deals with the dynamic response of a free-standing ancient column in the Roman Agora of Thessaloniki, Greece as a means to shed more light on the complex behaviour of rocking bodies under seismic excitation. Numerical analyses utilizing discrete element method were carried out with the use of multiple seismic records selected based on the disaggregation of the seismic hazard for the region of interest. To identify their impact on structural performance, earthquake Intensity Measures, such as Peak Ground Acceleration and Peak Ground Velocity are examined for the case of a column that sustained no visible permanent deformations during the Ms = 6.5 Thessaloniki earthquake of 1978. The analysis revealed a weak correlation of PGA and PGV with the response results and a significant influence of the mean frequency (f m ) of the seismic motion. No coupling was found between the maximum displacement of the top during the oscillation and the permanent post-seismic deformations. The complementarity of both earthquake Intensity Measures in the structural vulnerability assessment is also depicted.

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Section: Introductionmentioning

confidence: 99%

Efficiency of alternative intensity measures for the seismic assessment of monolithic free-standing columns

Pappas

Sextos

Porto

et al. 2016

Bull Earthquake Eng

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“…Kalkan and Kunnath (2006) stated that near-fault ground motions including fling step and forward directivity pulses can significantly activate higher modes of the structure compared to ordinary ground motions. Sehhati et al (2011) proposed a range of pulse-to-structure period ratios in which structural response can be estimated by equivalent pulses. Xu and Agrawal (2010) demonstrated that pulse components of near-fault records are the main cause of the maximum demands on structures.…”

Section: Introductionmentioning

confidence: 99%

Effects of forward directivity on the response of soil–structure systems

Khoshnoudian¹,

Attarnejad²,

Ahmadi³

et al. 2015

Proceedings of the ICE - Structures and Buildings

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2 3 4The effects of input parameters of pulse-like ground motions on the response of soil-structure systems are investigated through employing an ensemble of 64 ground motions. The soil and superstructure are idealised as a semi-infinite cone and a non-linear multiple-degrees-of-freedom shear building, respectively. The results confirm that the location of the critical storey is significantly affected by the pulse inputs and interacting parameters. Also, the pulse period ranges in which the critical storey complies with upper storeys are influenced considerably by interacting parameters. Moreover, there is a trade-off between pulse period and amplitude to determine the seismic demands of the structure.

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“…The larger Tpulse/Tstructure, the higher inter-story drift ratio especially in lower stories [32]. According to ASCE 41-13 and ASCE 7, members' plastic hinge rotation and maximum nonlinear inter-story drift ratio are well-known as the current seismic performance indicators, associated with structural components (local scale) and whole structure (global scale), respectively.…”

Section: Inter-story Drift Ratio Demand and Damage Patternmentioning

confidence: 99%

Near-Fault Effects on RC Buildings’ Demand in Linear and Nonlinear Analyses

2017

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Abstract. Strong ground motions of near-fault earthquakes are mostly generated by forward-directivity effects. Forward-directivity effects develop energetic pulses particularly in horizontal velocity history of fault-normal component. The narrow-band nature of the pulses results in revealing at least two peaks on the response spectra and also increasing seismic demand especially for mid-rise and high-rise buildings.Iranian seismic code (IS 2800-14) presents the coefficient N, for considering near-fault effects. It seems that the N is not efficient for designing in near-fault zone. The accurate near-fault demands can be determined by using nonlinear response history analyses. In the present paper, two 3-D reinforced concrete framed structures (RC buildings) are designed according to ACI 2014 and IS 2800-14. Then, the demands are estimated by employing linear response history analysis (LRHA) and also nonlinear response history analysis (NRHA) under an ensemble of 11 near-fault ground motions. The results reveal that the design spectrum of IS 2800-14 is incompatible with near-fault spectra and underestimates demands in the long periods range. Further, implementation of LRHA using response modification factor (R u ) and deflection amplification factor (C d ) leads to insufficient inter-story drift ratios. Finally, the 2 influence of enhancing ductility is studied by determining ductility reduction factors for near-fault records.

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Effects of near-fault ground motions and equivalent pulses on multi-story structures

Cited by 188 publications

References 14 publications

Efficiency of alternative intensity measures for the seismic assessment of monolithic free-standing columns

Efficiency of alternative intensity measures for the seismic assessment of monolithic free-standing columns

Effects of forward directivity on the response of soil–structure systems

Near-Fault Effects on RC Buildings’ Demand in Linear and Nonlinear Analyses

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