A design procedure for dual eccentrically braced-moment resisting systems

2009 ◽  
Author(s):  
M Bosco ◽  
A Ghersi ◽  
P Rossi
Keyword(s):  
Design Procedure ◽  
Moment Resisting

Real-Time Hybrid Simulation of a Steel MRF with Large Scale Passive Magneto-Rheological Fluid Dampers under Selected Ground Motions

2011 ◽  
Vol 243-249 ◽  
pp. 3962-3965
Author(s):  
Cheng Chen ◽  
James M. Ricles
Keyword(s):  
Real Time ◽  
Large Scale ◽  
Design Procedure ◽  
Efficient Design ◽  
Mr Fluid ◽  
Moment Resisting Frame ◽  
Moment Resisting ◽  
Fluid Dampers ◽  
Magneto Rheological ◽  
Steel Mrf

Experimental evaluation of large scale MR fluid dampers for seismic hazard mitigation in buildings is presented in this paper. A simplified design procedure is applied to design a two-story, four-bay steel moment resisting frame (MRF) prototype structure with MR fluid dampers in passive mode. Real-time hybrid simulations are conducted to experimentally evaluate the performance of the MRF. The simulation results show that the simplified design procedure enables an efficient design to be achieved for an MRF with MR fluid dampers in passive-on mode.

Performance-Based Seismic Design of Pallet-Type Steel Storage Racks

2006 ◽  
Vol 22 (1) ◽  
pp. 47-64 ◽  
Author(s):  
André Filiatrault ◽  
Robert E. Bachman ◽  
Michael G. Mahoney
Keyword(s):  
Seismic Design ◽  
Ground Motions ◽  
Design Procedure ◽  
The United States ◽  
Moment Frames ◽  
Type Steel ◽  
Collapse Prevention ◽  
Moment Resisting ◽  
Performance Based Seismic Design ◽  
Storage Racks

This paper develops a performance-based seismic design procedure for pallet-type steel storage racks located in areas accessible to the public. Performance objectives for racks consistent with current building code procedures in the United States are defined. The paper focuses on collapse prevention of racks in their down-aisle direction under the Maximum Considered Earthquake (MCE) ground motions at the site. The down-aisle lateral load-resisting systems of racks are typically moment frames utilizing special proprietary beam-to-column moment-resisting connections that may result in large lateral displacements when subjected to MCE ground motions. A simple analytical model that captures the seismic behavior of racks in their down-aisle direction is proposed. The model assumes that the beams and columns remain elastic in the down-aisle direction and that all nonlinear behavior occurs in the beam-to-column connections and the moment-resisting connections between the base columns and support concrete slab. Therefore the behavior is based on the effective rotational stiffnesses developed by the beam-to-column connectors and column-to-slab connections that vary significantly with connection rotation. The model is validated against the results of shake-table tests conducted on full-scale racks under several ground-motion intensities. Finally, the model is incorporated in a displacement-based procedure to verify collapse prevention of racks in their down-aisle direction under the MCE.

scholarly journals Seismic Behaviour of EC8-Compliant Moment Resisting and Concentrically Braced Frames

Buildings ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 196 ◽  
Author(s):  
Silvia Costanzo ◽  
Roberto Tartaglia ◽  
Gianmaria Di Lorenzo ◽  
Attilio De Martino
Keyword(s):  
Design Procedure ◽  
Eurocode 8 ◽  
Braced Frames ◽  
Concentrically Braced Frames ◽  
Research Activity ◽  
Seismic Behaviour ◽  
Concentrically Braced ◽  
Dynamic Analyses ◽  
Moment Resisting ◽  
Energy Dissipation Capacity

The design procedure codified within current Eurocode 8 for dissipative moment resisting and concentrically braced frames have led to the design of massive systems characterized in the most of cases by poor energy dissipation capacity. The research activity presented in the current paper addresses the identification of the main criticisms and fallacies in the current EN 1998-1 for those seismic-resistant typologies. In this regard, the design provisions and codified rules for both moment resisting frames (MRFs) and chevron concentrically braced frames (CCBFs) are critically discussed and numerically investigated. Static and incremental dynamic analyses were performed on a set of 3 and 6-story frames designed compliant to EN 1998-1. The results from the numerical analyses are reported and discussed.

scholarly journals Seismic design procedure for steel moment resisting frames with viscous dampers

2017 ◽  
Author(s):  
Κωνσταντίνος Καρινιωτάκης
Keyword(s):  
Seismic Design ◽  
Design Procedure ◽  
Viscous Dampers ◽  
Steel Moment Resisting Frames ◽  
Moment Resisting Frames ◽  
Moment Resisting

Σε αυτή τη διατριβή, αναπτύσσεται μια μεθοδολογία αντισεισμικού σχεδιασμού για πλαισιακούς φορείς από χάλυβα με ιξώδεις αποσβεστήρες μέσα στο πλαίσιο του Ευρωκώδικα 8, ικανοποιώντας τις απαιτήσεις α) για μηχανισμό πλευρικής μετατόπισης με πλαστικές αρθρώσεις στις δοκούς και στις βάσεις των υποστυλωμάτων στη βάση του φορέα και β) για αντοχή σε κατάρρευση των πλαισιακών φορέων με ιξώδεις αποσβεστήρες τουλάχιστον ίση με αυτή των συμβατικών πλαισιακών φορέων. Προτείνεται ένας συντηρητικός κανόνας για τον ικανοτικό σχεδιασμό των υποστυλωμάτων. Συγκεκριμένα η αξονική δύναμη που χρησιμοποιείται στον ικανοτικό σχεδιασμό των υποστυλωμάτων υπολογίζεται ως η περιβάλλουσα της αξονικής δύναμης από την κατάσταση μέγιστης μετατόπισης και της αξονικής δύναμης από την κατάσταση μέγιστης ταχύτητας επί έναν συντελεστή. Ο κανόνας αυτός γίνεται πιο αυστηρός για κτίρια με περισσότερους από 10 ορόφους ώστε να επιληφθεί του θέματος ότι οι διαθέσιμες μέθοδοι ανάλυσης για κατασκευές με αποσβεστήρες υποεκτιμούν τις μέγιστες δυνάμεις των αποσβεστήρων στους χαμηλότερους ορόφους των ψηλών πλασιακών φορέων. Κατάλληλες τιμές του συντελεστή ευαισθησίας σχετικής μετακίνησης ορόφου (θ) προτείνονται, ώστε να εξασφαλίζεται αντοχή σε κατάρρευση των πλαισιακών φορέων με ιξώδεις αποσβεστήρες τουλάχιστον ίση με αυτή των συμβατικών πλαισιακών φορέων.

scholarly journals Development of a Seismic Design Approach for Infill Walls Equipped with Structural Fuse

2012 ◽  
Vol 6 (1) ◽  
pp. 249-263 ◽  
Author(s):  
Mohammad Aliaari ◽  
Ali M. Memari
Keyword(s):  
Seismic Design ◽  
Design Procedure ◽  
Design Approach ◽  
Infill Wall ◽  
Infill Walls ◽  
Isolation System ◽  
Masonry Infill ◽  
Masonry Infill Walls ◽  
Structural Fuse ◽  
Moment Resisting

Presented herein is a seismic design approach developed for a proposed infill wall “structural fuse” system for use in building frames. The purpose of this system is to prevent damage to frame or infill walls due to infill wall-frame in-teraction during potentially damaging earthquakes by isolating them through a “sacrificial” component or a structural fuse. The design approach includes a procedure for design and application of the fuse system in a multi-bay, multi-story build-ing with moment resisting frames. The empirical equation developed to predict the in-plane strength of masonry infill walls equipped with structural fuse is discussed. A calculation method is suggested to specify an appropriate fuse element capacity arrangement in a building frame in order to achieve desirable and controlled structural performance. The design procedure is shown through application to two buildings used for example, a low-rise (4-story) and a mid-rise (8-story) building. The result of the study demonstrates that the proposed isolation system has merits and can potentially improve the seismic performance of masonry infill walls by protecting the infill wall and the frame from damages due to their in-teraction.

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