scholarly journals EFFECTS OF INPUT DIRECTION OF GROUND MOTION AND COLUMN OVERDESIGN FACTOR ON SEISMIC RESPONSE OF 3D STEEL MOMENT FRAMES WITH SQUARE TUBE COLUMNS

2015 ◽  
Vol 80 (717) ◽  
pp. 1773-1783 ◽  
Author(s):  
Iathong CHAN ◽  
Yuji KOETAKA ◽  
Keiichiro SUITA
Keyword(s):  
Seismic Response ◽  
Ground Motion ◽  
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.

INFLUENCE OF EARTHQUAKE MECHANISMS TO THE SEISMIC RESPONSE OF STEEL MOMENT FRAMES

2021 ◽  
Author(s):  
Liseth Campos ◽  
Pablo Torres-Rodas ◽  
Pablo Quinde ◽  
Fabricio Yepez
Keyword(s):  
Seismic Response ◽  
Moment Frames ◽  
Steel Moment Frames

Influence of deterioration modelling on the seismic response of steel moment frames designed to Eurocode 8

2017 ◽  
Vol 47 (2) ◽  
pp. 356-376 ◽  
Author(s):  
Antonios Tsitos ◽  
Miguel A. Bravo-Haro ◽  
Ahmed Y. Elghazouli
Keyword(s):  
Seismic Response ◽  
Eurocode 8 ◽  
Moment Frames ◽  
Steel Moment Frames

Required Column Overdesign Factor of 3D Steel Moment Frames with Square Tube Columns

2018 ◽  
Vol 763 ◽  
pp. 235-242
Author(s):  
Iathong Chan ◽  
Yuji Koetaka
Keyword(s):  
Plastic Deformation ◽  
Bearing Capacity ◽  
Ground Motion ◽  
Seismic Design ◽  
3D Analysis ◽  
Horizontal Load ◽  
Moment Frames ◽  
Steel Moment Frames ◽  
Load Bearing Capacity ◽  
Load Bearing

Steel moment frames are designed to ensure sufficient energy absorption capacity by achieving an entire beam-hinging collapse mechanism against severe earthquakes. Therefore, the column overdesign factor is stipulated in seismic design codes in some countries. For example in Japanese seismic design code, the specified column overdesign factor is 1.5 or more for steel moment frames with square tube columns. And this paper describes seismic response by 3D analysis of steel moment frames, and presents seismic demand for the column overdesign factor to keep the damage of square tube columns below the specified limit of plastic deformation. The major parameters are column overdesign factor, horizontal load bearing capacity, shape of frames and input direction of ground motion. In order to investigate 3D behavior of frames and correlation between plastic deformation of columns and column over design factor, apparent column overdesign factor, which is defined as the ratio of full plastic moment of the column (s) to the full plastic moment of the beam (s) projected in the input direction of the ground motion, is introduced. From the earthquake response analysis, it is clarified that the profile of maximum value of cumulative plastic deformation of columns to apparent column overdesign factor, with the similar horizontal load bearing capacity, are nearly identical regardless of number of stories, floor plan, and input direction of ground motion. As a result, the required column overdesign factor to keep the damage of columns below the limit of plastic deformation is proposed under the reliability index of 2.

Impact of Residual Stresses and Initial Imperfections on the Seismic Response of Steel Moment Frames

2012 ◽  
Vol 138 (7) ◽  
pp. 942-951 ◽  
Author(s):  
Kapil Mathur ◽  
Larry A. Fahnestock ◽  
Taichiro Okazaki ◽  
Matthew J. Parkolap
Keyword(s):  
Residual Stresses ◽  
Seismic Response ◽  
Moment Frames ◽  
Steel Moment Frames ◽  
Initial Imperfections

EFFECT OF COLUMN BASE BEHAVIOUR ON THE SEISMIC RESPONSE OF STEEL MOMENT FRAMES

2005 ◽  
Vol 9 (sup2) ◽  
pp. 415-438 ◽  
Author(s):  
M. Kurata ◽  
M. Nakashima ◽  
K. Suita
Keyword(s):  
Seismic Response ◽  
Moment Frames ◽  
Steel Moment Frames ◽  
Column Base

scholarly journals Applications of vertical steel pipe dampers for seismic response reduction of steel moment frames

2017 ◽  
Vol 138 ◽  
pp. 02002
Author(s):  
Junaedi Utomo ◽  
Muslinang Moestopo ◽  
Adang Surahman ◽  
Dyah Kusumastuti
Keyword(s):  
Seismic Response ◽  
Steel Pipe ◽  
Moment Frames ◽  
Steel Moment Frames
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