科研之友
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摘要
In this study, the influences of the P-Delta effect on the behavior of middle-rise unbraced steel frames and the validity of factor B2 were investigated using the analytical approach to suggest the basic design information on the P-Delta effect to the structural engineers. The refined plastic hinge method with an arc length algorithm was applied to the two-dimensional second-order inelastic analysis which can cover the post-maximum load behavior. Four types of middle-rise unbraced steel frames were selected as the subjects of the analysis. The main parameters of the analysis were the shape and the scale of the frame, the stiffness of the beam and the first-floor column, and the axial load ratio of the first-floor column. As revealed by the analytical research that was conducted, the P-Delta effect affects the behavior of middle-rise unbraced steel frames and the axial load, and the stiffness of the first-floor column are the main factors which govern the P-Delta effect. In addition, factor B2 is not applicable to the frame that has not clear story concept and it does not properly estimate the P-Delta effect of an unbraced frame when nonlinear-inelastic behavior is induced. Thus, reasonable guidelines are needed for the use of factor B2.
- 出版日期2010-9
