Seismic performance improvement of Special Truss Moment Frames using damage and energy concepts

2014 ◽  
Vol 44 (7) ◽  
pp. 1055-1073 ◽  
Author(s):  
Ahmad Heidari ◽  
Sadjad Gharehbaghi
Keyword(s):  
Performance Improvement ◽  
Seismic Performance ◽  
Moment Frames ◽  
Special Truss Moment Frames

scholarly journals Analytical investigation of the seismic performance of special truss girder framing systems with new technologies

2020 ◽  
Author(s):  
Μαρία Ντίνα
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Seismic Performance ◽  
New Technologies ◽  
Analytical Investigation ◽  
Moment Frames ◽  
Special Truss Moment Frames

Αντικείμενο της Διατριβής αποτελεί η αναλυτική διερεύνηση της δυνατότητας βελτίωσης της αντισεισμικής συμπεριφοράς ειδικών δικτυωτών πλαισιακών συστημάτων (Special Truss Moment Frames, STMFs, από χάλυβα) μέσω της ενσωμάτωσης ράβδων κυκλικής διατομής από κράματα νικελίου-τιτανίου (μνήμης μορφής – shape memory alloy bars), οι οποίες αποτελούν εναλλακτικό σύστημα απορρόφησης της σεισμικής ενέργειας στο ειδικό τμήμα (special segment) των πλαισίων. Τούτο καθόσον διαθέτουν την δυνατότητα να ανακτήσουν την αρχική τους (απαραμόρφωτη) γεωμετρία μετά από μηχανική διαταραχή κατά την αποφόρτιση, μέσω του μετασχηματισμού φάσης των κρυσταλλικών δομών (ματερνσιτικής – ωστενιτικής). Ο επικρατών αντισεισμικός σχεδιασμός των STMFs με ειδικό μέρος ευρισκόμενο στο μέσο του ανοίγματος τους (με σκοπό την απορρόφηση σεισμικής ενέργειας) είναι η δημιουργία πλαστικών αρθρώσεων στις τέσσερεις γωνίες. Αυτός ο μηχανισμός προτείνεται να αντικατασταθεί μέσω της παραμόρφωσης των SMAs σε ένα ειδικό μέρος με αρθρώσεις στις κορυφές του. Τονίζεται ότι οι ράβδοι SMA θεωρούνται σε όλες τις αναλύσεις της Διατριβής ως μη λυγηρές, είτε λόγω μεγάλης διατομής είτε λόγω ενίσχυσης μέσω συστημάτων αποφυγής λυγισμού.

Numerical study on seismic performance improvement of composite wide beam-column interior joints

2021 ◽  
pp. 103637
Author(s):  
Satish Paudel ◽  
Ganchai Tanapornraweekit ◽  
Somnuk Tangtermsirikul
Keyword(s):  
Performance Improvement ◽  
Seismic Performance ◽  
Numerical Study ◽  
Wide Beam

Effect of Common U.S. Ground Motion Selection Methods on the Structural Response of Steel Moment Frame Buildings

2019 ◽  
Vol 35 (4) ◽  
pp. 1611-1635
Author(s):  
Raul Uribe ◽  
Siamak Sattar ◽  
Matthew S. Speicher ◽  
Luis Ibarra
Keyword(s):  
Los Angeles ◽  
Ground Motion ◽  
Seismic Performance ◽  
Common Ground ◽  
Traditional Approach ◽  
Structural Response ◽  
Output Parameter ◽  
Selection Methods ◽  
Moment Frames ◽  
The Impact

This study quantifies the impact of two common ground motion (GM) selection methods, included in U.S. standards, on the seismic performance evaluation of steel special moment frames. The methods investigated are a “traditional” approach, herein referred to as the target maximum considered earthquake (TMCE) method, and a newer approach known as the conditional mean spectrum (CMS) method. The TMCE method selects GMs using the risk-based maximum considered earthquake (MCER) spectrum as the target spectrum, while the CMS method uses the CMS that anchors the MCER at multiple conditioning periods. Three special steel moment frames of 4, 8, and 16 stories are designed in accordance with ASCE/SEI 7-10, and their seismic performance is assessed with the nonlinear dynamic procedure prescribed in ASCE/SEI 41-13 using GMs selected and scaled in accordance with the aforementioned methods. A comparison of statistical parameters for the reduced beam sections and column hinges is conducted using the normalized demand-to-capacity ratio ( DCR), as the output parameter. The buildings are evaluated at the collapse prevention performance level for a far-field site located in Los Angeles, CA. In general, the CMS method results in lower DCRs of the frame components and smaller output parameter dispersion. In addition to the spectral shape, the demands are largely influenced by the spectral accelerations prescribed for each evaluated method. The consideration of collapse realizations is also documented as well as the existing and proposed statistical methods to account for these realizations. The study shows that the GM selection process can cause significant differences in structural response that may lead to different retrofitting decisions.

Experimental Study of Seismic Performance Improvement of Pilotis RC Column Strengthened with FRP

2019 ◽  
Vol 10 (1) ◽  
pp. 17-25 ◽  
Author(s):  
Jeongjin Choi ◽  
◽  
Taehun Lee ◽  
Byeongjin Park ◽  
Kwanggun Rho ◽  
...  
Keyword(s):  
Experimental Study ◽  
Performance Improvement ◽  
Seismic Performance ◽  
Rc Column

Seismic Design and Performance Evaluation of Long-Span Special Truss Moment Frames

2019 ◽  
Vol 145 (7) ◽  
pp. 04019053 ◽  
Author(s):  
Chatchai Jiansinlapadamrong ◽  
KyoungSub Park ◽  
John Hooper ◽  
Shih-Ho Chao
Keyword(s):  
Performance Evaluation ◽  
Seismic Design ◽  
Moment Frames ◽  
Long Span ◽  
And Performance ◽  
Special Truss Moment Frames

Investigation of Seismic Performance of (RBS) and Drilled Flange Connection (DFC) Containing rhombus Shaped Hole in Steel Moment Frames

2020 ◽  
Vol 18 (2) ◽  
pp. 246-262
Author(s):  
Mehdi Vajdian ◽  
S. Mehdi Zahraei ◽  
S. Mohammad Mirhosseini ◽  
Ehsanollah Zeighami
Keyword(s):  
Seismic Performance ◽  
Moment Frames ◽  
Steel Moment Frames ◽  
Flange Connection ◽  
Shaped Hole

scholarly journals Column splice fracture effects on the seismic performance of steel moment frames

2017 ◽  
Vol 137 ◽  
pp. 93-101 ◽  
Author(s):  
Kimberly Stillmaker ◽  
Xai Lao ◽  
Carmine Galasso ◽  
Amit Kanvinde
Keyword(s):  
Seismic Performance ◽  
Moment Frames ◽  
Steel Moment Frames
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