scholarly journals A consideration of P-delta effects
 in ductile reinforced concrete frames

1978 ◽  
Vol 11 (3) ◽  
pp. 151-160 ◽  
Author(s):  
T. Paulay
Keyword(s):  
Reinforced Concrete ◽  
Stability Index ◽  
Concrete Frames ◽  
Reinforced Concrete Frames ◽  
Existing Building ◽  
Design Procedures ◽  
Gravity Load ◽  
Load Carrying ◽  
Probable Effect ◽  
The Stability

The likely effects of secondary moments due to the gravity load, which is being laterally displaced during inelastic seismic storey drift, upon ductile reinforced concrete frames is examined. Existing building code recommendations and design procedures relevant to the phenomenon are briefly reviewed. The probable effect of P-delta moments on inelastic dynamic
frame response is discussed. With the aid of illustrations various design considerations are presented. It is suggested that if strength demand
due to P-delta effects exceeds 15% of the ideal lateral load carrying capacity of a subframe, this strength demand should be met. From the comparison of the elastic and inelastic deformations of a frame due to earthquake loading, recommendations are made for the estimation of critical inelastic drifts in the lower half of the frame. This is subsequently used to quantify the problem with the aid of the "stability index". The quantitative evaluation of P-delta effects for an 18 storey frame is illustrated in the appendix.

Hybrid Simulation of the Gravity Load Collapse of Reinforced Concrete Frames

2008 ◽  
Author(s):  
Majid Baradaran Shoraka ◽  
Arnaud Y. Charlet ◽  
Kenneth J. Elwood ◽  
Terje Haukaas
Keyword(s):  
Reinforced Concrete ◽  
Hybrid Simulation ◽  
Concrete Frames ◽  
Reinforced Concrete Frames ◽  
Gravity Load

scholarly journals An application of capacity design philosophy to gravity load dominated ductile reinforced concrete frames

1978 ◽  
Vol 11 (1) ◽  
pp. 50-61 ◽  
Author(s):  
T. Paulay
Keyword(s):  
Reinforced Concrete ◽  
Lateral Loading ◽  
Capacity Design ◽  
Concrete Frames ◽  
Reinforced Concrete Frames ◽  
Design Philosophy ◽  
Axial Forces ◽  
Earthquake Resistant Design ◽  
Gravity Load ◽  
High Level

Indiscriminate application of the capacity design philosophy can lead to unnecessary or indeed absurd conservatism in the earthquake resistant design of gravity load dominated ductile reinforced concrete frames. Low-rise framed buildings are typical examples. The origin of excessive potential strength with respect to lateral loading is discussed and proposals are made to establish an acceptable upper bound for lateral load carrying capacity in such frames. A technique is presented by which the successive formation of potential plastic hinges, involving partial beam sway mechanisms, can be conveniently assured. While retaining the requirements for energy dissipation in beams, it is postulated that at an acceptable high level of lateral loading the formation of storey mechanisms, necessary to complete the frame sway mechanism, should be tolerable. Examples are given to illustrate the determination of design quantities for bending moments, shear and axial forces for both, beams and columns.

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