scholarly journals Assessment of Response Reduction Factors Of Reinforced Concrete Buildings Using Response spectrum Analysis

2021 ◽  
Author(s):  
Natalie Simone Bryon
Keyword(s):  
Reinforced Concrete ◽  
Spectrum Analysis ◽  
Response Spectrum ◽  
Elastic Response ◽  
Reinforced Concrete Buildings ◽  
Response Spectrum Analysis ◽  
Concrete Buildings ◽  
Seismic Force ◽  
Comparative Review ◽  
Reduction Factors

This study provides an in-depth comparative review of the response reduction factors per NBCC 2015 code used to reduce the elastic response of the structure. An assembly of eight (8) reinforced concrete buildings of which four (4) different Seismic Force Resisting System (SFRS) types was included. The models were also categorized based on ductility and overstrength characteristics specifically ductile and conventional construction moment frames as well as ductile and conventional construction shear walls. All eight (8) models were analyzed using elastic Response Spectrum Analysis (RSA). Each SFRS was also analyzed as both a 12 storey and 40 storey building in order to explore the effects / restrictions of building height. The Equivalent Lateral Force Procedure was performed on the assembly of models for comparison to determine if the static procedure as per NBCC 2015 provisions resulted in overly conservative or similar results. The relevant structural response such as base reactions, storey drifts, storey forces, and member forces were recorded and analyzed.

scholarly journals Assessment of Response Reduction Factors Of Reinforced Concrete Buildings Using Response spectrum Analysis

2021 ◽  
Author(s):  
Natalie Simone Bryon
Keyword(s):  
Reinforced Concrete ◽  
Spectrum Analysis ◽  
Response Spectrum ◽  
Elastic Response ◽  
Reinforced Concrete Buildings ◽  
Response Spectrum Analysis ◽  
Concrete Buildings ◽  
Seismic Force ◽  
Comparative Review ◽  
Reduction Factors

This study provides an in-depth comparative review of the response reduction factors per NBCC 2015 code used to reduce the elastic response of the structure. An assembly of eight (8) reinforced concrete buildings of which four (4) different Seismic Force Resisting System (SFRS) types was included. The models were also categorized based on ductility and overstrength characteristics specifically ductile and conventional construction moment frames as well as ductile and conventional construction shear walls. All eight (8) models were analyzed using elastic Response Spectrum Analysis (RSA). Each SFRS was also analyzed as both a 12 storey and 40 storey building in order to explore the effects / restrictions of building height. The Equivalent Lateral Force Procedure was performed on the assembly of models for comparison to determine if the static procedure as per NBCC 2015 provisions resulted in overly conservative or similar results. The relevant structural response such as base reactions, storey drifts, storey forces, and member forces were recorded and analyzed.

scholarly journals Seismic force redistribution in asymmetrical reinforced concrete buildings due to soil-structure interaction

2020 ◽  
Author(s):  
Παρασκευή Ασκούνη
Keyword(s):  
Reinforced Concrete ◽  
Soil Structure ◽  
Soil Structure Interaction ◽  
Reinforced Concrete Buildings ◽  
Structure Interaction ◽  
Concrete Buildings ◽  
Seismic Force

Η παρούσα διατριβή διερευνά την ανακατανομή των εσωτερικών δυνάμεων μεταξύ των κατακόρυφων μελών οπλισμένου σκυροδέματος (Ο/Σ) απλών ασύμμετρων χαμηλών κατασκευών υπό σεισμική φόρτιση λαμβάνοντας υπόψη την δυναμική αλληλεπίδραση εδάφους-κατασκευής (ΔΑΕΚ). Μια σειρά μονώροφων επιπέδων πλαισίων Ο/Σ με ένα, δύο και τέσσερα ανοίγματα, εδραζόμενα επί απαραμόρφωτου ή παραμορφώσιμου εδάφους μέσω θεμελίων με συνδετήριες δοκούς αναλύεται δυναμικά. Η σεισμική φόρτιση προσομοιώνεται με συνθετικά επιταχυνσιογραφήματα συμβατά με το φάσμα σχεδιασμού του Ευρωκώδικα 8. Μονώροφα και τριώροφα 3-Δ κτιρίων Ο/Σ ενός ανοίγματος εδραζόμενα επί απαραμόρφωτου ή παραμορφώσιμου εδάφους μέσω θεμελίων με συνδετήριες δοκούς και γενικής κοιτόστρωσης, αναλύονται δυναμικά χρησιμοποιώντας πραγματικά επιταχυνσιογραφήματα.Η ασυμμετρία στα εξεταζόμενα 2-Δ και 3-Δ κτίρια Ο/Σ επιτυγχάνεται αντικαθιστώντας έναν στύλο από ένα τοίχωμα μεταβλητού πλάτους. Η συμπεριφορά των μελών Ο/Σ θεωρείται ελαστική σύμφωνα με τους ισχύοντες κανονισμούς σχεδιασμού, καθώς και ελαστοπλαστική σύμφωνα με ένα ελαστοπλαστικό μηχανικό μοντέλο ινών. Τόσο οι γραμμικές όσο και οι μη γραμμικές ελαστοπλαστικές αναλύσεις πραγματοποιούνται στο χρονικό πεδίο. Οι γραμμικές αναλύσεις γίνονται λαμβάνοντας υπόψη τη μειωμένη δυσκαμψία των μελών λόγω της ρηγμάτωσης του σκυροδέματος. Οι μη γραμμικές ελαστοπλαστικές αναλύσεις γίνονται με ένα μοντέλο συγκεντρωμένης μέσω μείωση της δυσκαμψίας. Οι μη γραμμικές ποσότητες απόκρισης περιλαμβάνουν όχι μόνο τις δυνάμεις ροπής και διάτμησης των μελών, αλλά και τις γωνιακές παραμορφώσεις ορόφων και διάφορους δείκτες βλάβης σε επίπεδα μέλους και κατασκευής για τέσσερα επίπεδα επιτελεστικότητας. Αδιάστατοι λόγοι των εσωτερικών απόλυτων μέγιστων δυνάμεων και ροπών των κατακόρυφων μελών Ο/Σ εκφράζονται ως προς τις ιδιότητες διατομής τους και συγκρίνονται για τις περιπτώσεις ΔΑΕΚ και απαραμόρφωτου εδάφους τόσο για τις ελαστικές όσο και για τις ελαστοπλαστικές αναλύσεις. Έτσι, προσδιορίζεται και συζητείται η επίδραση της ΔΑΕΚ στη σεισμική απόκριση των κατακόρυφων στοιχείων και ολόκληρης της κατασκευής. Όλες οι αναλύσεις αποδεικνύουν ότι η ΔΑΕΚ επηρεάζει έντονα τη σεισμική απόκριση μελών Ο/Σ και απλών κατασκευών Ο/Σ και η επιρροή της μπορεί να είναι ευεργετική ή επιζήμια σε αντίθεση με τους ισχύοντες κανονισμούς οι οποίοι θεωρούν μόνο τα θετικά αποτελέσματά της.

Seismic Performance Evaluation of a Super-Tall Building Structure

2012 ◽  
Vol 446-449 ◽  
pp. 2357-2360
Author(s):  
Ying Zhou ◽  
Lei Hong
Keyword(s):  
Performance Evaluation ◽  
Reinforced Concrete ◽  
Seismic Performance ◽  
Response Spectrum ◽  
Hybrid Structure ◽  
Elastic Response ◽  
Response Spectrum Analysis ◽  
Seismic Performance Evaluation ◽  
Steel Reinforced Concrete ◽  
Tall Structure

This paper carried out the seismic performance evaluation of a super-tall hybrid structure. The hybrid structure consists of steel reinforced concrete (SRC) frame and reinforced concrete (RC) core wall. Based on the characteristics of the structure, the structural system, seismic performance objectives and seismic measures are presented. Moreover, the elastic response spectrum analysis, elastic and elasto-plastic dynamic analysis are performed to evaluate the seismic behavior of the structure at different seismic hazard levels. The conclusion can be drawn that through the seismic measures taken in the paper, the super-tall structure could generally achieve the seismic performance objectives.

scholarly journals BENEFIT FROM CHAINED MASONRY WALLS TO IMPROVE THE SEISMIC RESPONSE OF REINFORCED CONCRETE BUILDINGS

2021 ◽  
Vol 30 (2) ◽  
Author(s):  
Abdelkader Nour ◽  
Abdelkader Benanane ◽  
Humberto Varum
Keyword(s):  
Reinforced Concrete ◽  
Seismic Behavior ◽  
Lateral Displacement ◽  
Response Spectrum ◽  
Masonry Walls ◽  
Base Shear ◽  
Reinforced Concrete Buildings ◽  
Concrete Buildings ◽  
Finite Element Software ◽  
Seismic Loadings

The multiple earthquakes have proved the effect of chained masonry walls on the seismic behavior of multistoried reinforced concrete buildings. The chained masonry walls have been considered one of the types of masonry infill walls but without gaps. This participation came intending to study this effect through the modeling of several two-dimensional frames for a multistoried reinforced concrete building, taking into account the hollow brick walls, which represent the most common type in Algeria. We analyzed the proposed models using ETABS finite element software, relying on the response spectrum method and respecting the most important requirements according to the applicable Algerian Seismic Code. After analysis of the different models, the results have been compared according to the parameters of the period, base shear, lateral displacement, and stiffness. Through a critical synthesis of the results, we concluded that these walls could significantly affect the seismic behavior of this type of buildings. Moreover, the neglect of these walls in the modeling process can lead designers to have a false perception of the behavior of these buildings towards seismic loadings.    

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