Simple Analysis of Horizontal Load-Deflection Behavior of Steel Frames

In order to estimate simply the seismic performance of a certain story of a multi-story, multi-bay unbraced steel frame, the paper proposes a simple method to draw the horizontal load-deflection relationship of a story subassemblage. In the paper, first, the load-deflection relationship for the beam-and-column subassemblage is expressed by explicit equations, considering P-Δ efffect and materiatl non-linearity. Secondly, the method to apply this relationship in story subassemblage is described. Finally, accuraey of the present method is examined by comparing the results obtained with the results of precise numerical analysis and previous test. Using the formulas proposed in the present method, it is possible to obtain the horizontal load carrying capacity of an existing steel frame in the course of the seismic diagnosis