P-δ EFFECT IN EARTHQUAKE RESISTANT DESIGN FOR SHEAR TYPE MULTI-STORY FRAMES

Abstract

The P-δ effect produced by the gravity load and the lateral deformation of frames is most important in the high-rise building under earthquakes. A great contribution has been made by previous researches for the clarification of the P-δ effect. However, the real effect of the P-δ effect on the seismic design still remains ambiguous. In this paper, a simple expression of the P-δ effect on the required base shear coefficient is derived for shear-type multi-story frames.