Abstract
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.
Highlights
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
In its commentary the New Zealand National Society for Earththis document implies that only secondary quake Engineering, Committees of the members, which are not part of the lateral
In reporting the experimental results related to the behaviour of subassemblages of reinforced concrete ductile frames, Bertero and Popov pointed out the seriousness of the compounding effects of stiffness and strength degradation due to inelastic reversed cyclic loading, and that of P-delta moments
Summary
Relative to its adjacent storeys shall be considered in accordance with accepted. Recent work of a discussion group of engineering practice". Standards Association of New Zealand and force resisting system, must be checked for researchers at Universities was centered on actions that might be induced in them by various design aspects of earthquake resisting interstorey drift In this the drift should ductile reinforced concrete frames. A number of questions lead up to the design where 6 e is the drift computed for the elastic frame under code specified lateral recommendations: loading, y is the ductility factor, typically equal to 5 for ductile reinforced concrete (a) Aresecondarymomentsdue to P - delta frames, and 8 is a stability coefficient effects critical in seismic design, and if so, which is similar to the stability index when are they critical?.
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