Estimation of seismic inelastic deformation demands in plane steel MRF with vertical mass irregularities

Application of the hybrid force/displacement (HFD) seismic design method to composite steel/concrete plane frames

“…The HFD method, as developed for pure steel frames [33][34][35][36][37][38][39], is based on equations derived on the assumptions of rigid connections, disregarding panel zones and centerline member representation for MRFs. Here, the proposed HFD for CFT-MRFs is based on equations derived from different assumptions [40].…”

“…This methodology combines the advantages of the well-known force-based and displacement-based seismic design methods in a hybrid force/ displacement (HFD) design scheme and works in a PBD framework. The method has been proposed in the preliminary work of Karavasilis et al [33] and evolved by extensive parametric studies of the authors [34][35][36][37][38] to reach its final stage dealing with plane steel frames of various kinds [39]. Herein, the HFD method is extended to CFT-MRFs and applied to realistic design examples of CFT-MRFs using the formulae proposed by Skalomenos et al [40] and those presented here, which are based on a more refined modeling than in Tzimas et al [39].…”

Effect of Vertical Discontinuity of Columns in R.C Frames Subjected to Different Wind Speeds in India

“…Pushover analysis seemed to underestimate the response quantities in the upper floors of the irregular frames. Karavallis et al (2008) [8] studied the inelastic seismic response of plane steel moment-resisting frames with vertical mass irregularity. The analysis of the created response databank showed that the number of storeys, ratio of strength of beam and column and the location of the heavier mass influence the height-wise distribution and amplitude of inelastic deformation demands, while the response does not seem to be affected by the mass ratio.Sarkar et al (2010) [13] proposed a new method of quantifying irregularity in vertically irregular building frames, accounting for dynamic characteristics (mass and stiffness).…”

Evaluation of soil structure intreraction effects on the non stationary random seismic response of vertically mass irregular steel buildings

“…Usually, construction of buildings with different story usage, impose mass irregularity to the system. Through recent researches, it was observed that the amount and position of heavier stories play an important role in seismic performance of mass irregular buildings [10,11,14]. Meanwhile, low attention has been attributed to the effects of SSI on seismic response of these types of irregular structures.…”

“…Perfect regularity is an idealization that rarely occurs in constructions and irregular configurations are almost happened in real structures. Generally, vertically irregular buildings are more vulnerable to earthquake hazards compare to the buildings with regular configuration [10][11][12][13]. Variation of mass, stiffness and strength through the structure height makes non-geometric vertical irregularity in structures.…”