scholarly journals Estimation of Response Modification Factor and Nonlinear Displacement for Moment Resisting Reinforced Concrete Frames

2002 ◽  
Vol 6 (2) ◽  
pp. 29-37
Keyword(s):  
Reinforced Concrete ◽  
Concrete Frames ◽  
Reinforced Concrete Frames ◽  
Response Modification Factor ◽  
Moment Resisting ◽  
Modification Factor

scholarly journals Seismic Response Modification Factorof Reinforced Concrete Frames Basedon Pushover Analysis

2019 ◽  
Vol 2 (2) ◽  
Author(s):  
Amira Elyamany Mohamed ◽  
Walid A Attia ◽  
Wael M. El-Degwy
Keyword(s):  
Reinforced Concrete ◽  
Seismic Analysis ◽  
Pushover Analysis ◽  
Fundamental Period ◽  
Concrete Frames ◽  
Reinforced Concrete Frames ◽  
Response Modification Factor ◽  
R Factor ◽  
Modification Factor ◽  
The Given

Response modification factor is an essential factor in seismic analysis to provide economic design of reinforced concrete structures. Base shear force is divided by the response modification factor to consider the ability of the structure to dissipate energy through plastic hinges. The current study investigates the effects of changing some parameters on response modification factor (R-factor). Four groups of reinforced concrete frames were studied with different number of bays, number of stories, load pattern, and fundamental period of vibration. All reinforced concrete frames were analyzed using SAP 2000 then the straining actions results were used at specific excel sheets which are developed to design reinforced concrete members according to the Egyptian code of practice ECP-203 and ECP-201. Frames were analyzed by nonlinear static analysis (pushover analysis) using SAP2000. A sum of thirty two systems of frames was analyzed. According to the results, every frame has its unique value of R-factor. Accordingly, many parameters should be mentioned and considered at code to simulate the actual value of R-factor for each frame. Response modification factor is affected by many factors like stiffness, fundamental period of vibration, number of bays, frame height, geometry of the structure, etc. The given values of R-factor at ECP-201 can be considered conservative; as the accurate values of R-factor is higher than the given values.

SHAKING TABLE TESTS ON HAUNCH RETROFITTED REINFORCED CONCRETE FRAMES

2019 ◽  
Vol 3 (Special Issue on First SACEE'19) ◽  
pp. 233-240
Author(s):  
Junaid Akbar ◽  
Naveed Ahmad ◽  
Bashir Alam
Keyword(s):  
Reinforced Concrete ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Concrete Frames ◽  
Seismic Behaviour ◽  
Response Modification Factor ◽  
Rc Frames ◽  
Moment Resisting ◽  
Modification Factor ◽  
Rare Earthquake

Shaking table tests were performed on five one-third reduced scale two storey reinforced concrete (RC) moment resisting frames having construction defects (using low strength concrete without confining ties in beam-column joints, larger tie spacing, and reduced longitudinal and transverse reinforcements). The deficient frames were observed to have severe joint damageability, resulting in joint panel cover spalling and core concrete crushing. Haunch retrofitting technique was adopted to upgrade the seismic behaviour of deficient RC frames. Additional four deficient RC frames were built and retrofitted with steel haunch; both axially stiffer and deformable with energy dissipation, fixed to the beam-column connections to reduce shear demand on joint panels. The as-built and retrofitted frame seismic response modification factor (R) was calculated and compared to evaluate the viability of the haunch retrofitting technique. The haunch retrofitting technique increased the lateral stiffness and strength of the structure, resulting in the increase of structure overstrength. The retrofitting increased R factor by sixty percent to one hundred percent. The presented results indicate that the technique can significantly enhance the seismic performance of deficient RC frames, particularly against the frequent and rare earthquake events.

scholarly journals Design of beam-column joints

1977 ◽  
Vol 10 (4) ◽  
pp. 226-237
Author(s):  
R. W. G. Blakeley
Keyword(s):  
Reinforced Concrete ◽  
Seismic Design ◽  
Discussion Group ◽  
Concrete Frames ◽  
Reinforced Concrete Frames ◽  
Moment Resisting

This paper is the result of deliberations of the Society's discussion group on seismic design of ductile moment resisting reinforced concrete frames.

scholarly journals Analysis for torsion employing provisions of NZRS 4203:1974

1977 ◽  
Vol 10 (4) ◽  
pp. 219-225
Author(s):  
R. A. Poole
Keyword(s):  
Reinforced Concrete ◽  
Seismic Design ◽  
Discussion Group ◽  
Concrete Frames ◽  
Reinforced Concrete Frames ◽  
Moment Resisting

This paper is the result of deliberations of the Society's discussion group on seismic design of ductile moment resisting reinforced concrete frames.

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