Simplified second-order inelastic analysis for frame design
Abstract
Two simple, accurate and practical models are proposed to represent the second-order inelastic behavior of rigid and semi-rigid frames. One is called the "Modified Plastic Hinge Method". In this method, the simple plastic hinge method is modified to account for the gradual plastification of a cross-section in a member. This method improves the predictions of simple plastic hinge method. The second model is called the "Beam-Column Strength Method". In this method, a column in a frame is treated as an element, and the interaction curve of different slenderness ratio is taken as the ultimate strength surface. When the load combination reaches the ultimate strength surface, the column is considered as failed. This method takes into account the effect of member instability and plastification on structural stability. The load-deflection response predicted by the proposed methods is almost identical to that by the plastic zone method. It is found that when the axial load is large and/or the member is long, the simple plastic hinge method may overestimate the limit load of structures.
Degree
Ph.D.
Advisors
White, Purdue University.
Subject Area
Civil engineering
Off-Campus Purdue Users:
To access this dissertation, please log in to our
proxy server.