Performance‐based optimum tuning of tuned mass dampers on steel moment frames for seismic applications using the endurance time method

2021 ◽  
Author(s):  
Majid Tavakolinia ◽  
Mohammad Ch. Basim
Keyword(s):  
Moment Frames ◽  
Steel Moment Frames ◽  
Tuned Mass Dampers ◽  
Endurance Time ◽  
Endurance Time Method ◽  
Seismic Applications

Estimating structural damage of steel moment frames by Endurance Time method

2008 ◽  
Vol 64 (2) ◽  
pp. 145-155 ◽  
Author(s):  
H.E. Estekanchi ◽  
K. Arjomandi ◽  
A. Vafai
Keyword(s):  
Structural Damage ◽  
Moment Frames ◽  
Steel Moment Frames ◽  
Endurance Time ◽  
Endurance Time Method

Collapse assessment of steel moment frames using endurance time method

2015 ◽  
Vol 14 (2) ◽  
pp. 347-360 ◽  
Author(s):  
E. Rahimi ◽  
H. E. Estekanchi
Keyword(s):  
Moment Frames ◽  
Steel Moment Frames ◽  
Endurance Time ◽  
Endurance Time Method ◽  
Collapse Assessment

scholarly journals Endurance time method for multi-component analysis of steel elastic moment frames

2011 ◽  
Vol 18 (2) ◽  
pp. 139-149 ◽  
Author(s):  
V. Valamanesh ◽  
H.E. Estekanchi
Keyword(s):  
Component Analysis ◽  
Moment Frames ◽  
Endurance Time ◽  
Endurance Time Method

Design by Qualification Testing of Reduced Beam Section Welded Connections

2015 ◽  
Vol 1111 ◽  
pp. 229-234
Author(s):  
Florea Dinu ◽  
Dan Dubină ◽  
Cristian Vulcu ◽  
Calin Neagu
Keyword(s):  
Numerical Models ◽  
Shear Stresses ◽  
Moment Frames ◽  
Steel Moment Frames ◽  
Reduced Beam Section ◽  
The Face ◽  
Qualification Testing ◽  
Low Stiffness ◽  
Beam Section ◽  
Seismic Applications

Steel moment frames are common systems in multi-storey buildings. Even the relatively low stiffness of the system limits the applicability, they remain popular in seismic applications due to the good dissipation capacity. Considered deemed-to-comply in seismic applications, welded beam to column connections experienced serious damages and even failures during strong seismic earthquakes. These failures included fractures of the beam flange-to-column flange groove welds, cracks in beam flanges, and cracks through the column section. To reduce the risk of brittle failure of welded connections, beam weakening near the ends became popular. To assure the desired behavior, i.e. the development of plastic deformations in the reduced beam section zones rather than at the face of the column, proper detailing and sizing is necessary. Today design provisions are limited to long beams, where the effect of shear stresses may be neglected. The application of the same rules for short beams might be non-conservative, and therefore qualification testing is necessary. The study presents the qualification testing of reduced beam sections welded connections of short beams. Both monotonic and cyclic tests were performed and numerical models were validated based on the test data.

scholarly journals Evaluating Performance of Concrete Special Moment Resisting Frames with Different Seismic Coefficients Using Endurance Time Method

2018 ◽  
Vol 4 (1) ◽  
pp. 93 ◽  
Author(s):  
Hadi Radmanesh ◽  
Majid Mohammadi
Keyword(s):  
Performance Level ◽  
Cost Ratio ◽  
Optimum Structure ◽  
Moment Frames ◽  
Endurance Time ◽  
Lower Weight ◽  
Seismic Coefficient ◽  
Endurance Time Method ◽  
Moment Resisting ◽  
Real Earthquake

This performance-based study was conducted to investigate the effects of seismic coefficients on performance of concrete special moment frames of 5,7, and 10-storey buildings located in Tehran, Iran. The structures are designed three-dimensionally by ETABS 2016 software according to ACI-318-08. Fifteen specimens were designed with different base shears having seismic coefficients of 0.7, 0.85, 1, 1.15, and 1.30 times the proposed value of Iranian Standard 2800, (i.e. decreased by 70 and 85%, and increased by 115 and 130%). Endurance time method (ETA20in series of ET acceleration function) as well as three real earthquake records was employed to evaluate the seismic performance of the modeled structures. The performance of structures was compared by the time of the first plastic hinges formation in beams and columns, the time of entering to nonlinear region and the time of experiencing storey drift of 2% corresponding to the life safety performance level. It was observed that the results of ET records and real records were similar to each other. A procedure was proposed for finding optimum structure with lower weight using ET method through defining efficient ratio (ER) and cost ratio (CR). Based on the results of ER/CR ratio and considering the importance of collapse prevention performance level, optimum structure was a 7-storey structure with lower weight or cost whose seismic coefficient had been reduced by 70%. It was concluded that high safety can not be achieved simply by increasing the seismic coefficient of structures.

Experimental and analytical investigations of steel panel dampers for seismic applications in steel moment frames

2018 ◽  
Vol 47 (6) ◽  
pp. 1416-1439 ◽  
Author(s):  
Keh-Chyuan Tsai ◽  
Chung-Hsiang Hsu ◽  
Chao-Hsien Li ◽  
Pu-Yuan Chin
Keyword(s):  
Moment Frames ◽  
Steel Moment Frames ◽  
Steel Panel ◽  
Seismic Applications

scholarly journals Application of endurance time method in damage assessment of concrete moment frames

2020 ◽  
Vol 5 (2) ◽  
pp. 1-11
Author(s):  
A. Baniassadi ◽  
H. Estekanchi ◽  
◽  
Keyword(s):  
Damage Assessment ◽  
Moment Frames ◽  
Endurance Time ◽  
Endurance Time Method

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.

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