COLLAPSE MECHANISM AND DISPLACEMENT OF LOW AND MIDDLE-RISE STEEL MOMENT FRAMES UNDER HORIZONTAL BI-DIRECTIONAL GROUND MOTIONS

2020 ◽  
Vol 85 (771) ◽  
pp. 749-758
Author(s):  
Koji HIROISHI ◽  
Takanori ISHIDA ◽  
Ryota MASEKI ◽  
Hiroyuki NARIHARA ◽  
Satoshi YAMADA
Keyword(s):  
Ground Motions ◽  
Collapse Mechanism ◽  
Moment Frames ◽  
Steel Moment Frames

Effects of Fling Step and Forward Directivity on Seismic Response of Buildings

2006 ◽  
Vol 22 (2) ◽  
pp. 367-390 ◽  
Author(s):  
Erol Kalkan ◽  
Sashi K. Kunnath
Keyword(s):  
Seismic Response ◽  
Ground Motions ◽  
High Amplitude ◽  
Moment Frames ◽  
Steel Moment Frames ◽  
Damage Potential ◽  
Near Fault ◽  
Forward Directivity ◽  
Fling Step ◽  
Far Fault

This paper investigates the consequences of well-known characteristics of near-fault ground motions on the seismic response of steel moment frames. Additionally, idealized pulses are utilized in a separate study to gain further insight into the effects of high-amplitude pulses on structural demands. Simple input pulses were also synthesized to simulate artificial fling-step effects in ground motions originally having forward directivity. Findings from the study reveal that median maximum demands and the dispersion in the peak values were higher for near-fault records than far-fault motions. The arrival of the velocity pulse in a near-fault record causes the structure to dissipate considerable input energy in relatively few plastic cycles, whereas cumulative effects from increased cyclic demands are more pronounced in far-fault records. For pulse-type input, the maximum demand is a function of the ratio of the pulse period to the fundamental period of the structure. Records with fling effects were found to excite systems primarily in their fundamental mode while waveforms with forward directivity in the absence of fling caused higher modes to be activated. It is concluded that the acceleration and velocity spectra, when examined collectively, can be utilized to reasonably assess the damage potential of near-fault records.

scholarly journals EFFECTS OF INPUT DIRECTION ON COLLAPSE MECHANISM AND STORY DRIFT FOR LOW AND MIDDLE-RISE STEEL MOMENT FRAMES

2021 ◽  
Vol 86 (781) ◽  
pp. 491-500
Author(s):  
Koji HIROISHI ◽  
Takanori ISHIDA ◽  
Ryota MASEKI ◽  
Hiroyuki NARIHARA ◽  
Satoshi YAMADA
Keyword(s):  
Collapse Mechanism ◽  
Moment Frames ◽  
Steel Moment Frames ◽  
Story Drift
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