The Role of the Rotational Inertia on the Seismic Resistance of Free-Standing Rocking Columns and Articulated Frames

被引:57
作者
Makris, Nicos [1 ]
机构
[1] Univ Patras, Dept Civil Engn, Div Struct, GR-26500 Patras, Greece
关键词
RIGID BLOCKS; DIMENSIONAL RESPONSE; BODIES; CAPACITY; SPECTRUM; BEHAVIOR; CRITERIA; MODEL; SLIDE;
D O I
10.1785/0120130064
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
A half century ago, Housner (1963) explained that there is a safety margin between uplifting and overturning of slender, free-standing columns and that as the size of the column or the frequency of the excitation increases, this safety margin increases appreciably to the extent that large, free-standing columns enjoy ample seismic stability. This paper revisits the important implications of this postuplift dynamic stability and explains that the enhanced seismic stability originates from the difficulty of mobilizing the rotational inertia of the free-standing column. As the size of the column increases, the seismic resistance (rotational inertia) increases with the square of the column size, whereas the seismic demand (overturning moment) increases linearly with size. Accordingly, in theory, a slender, free-standing column can survive any ground shaking provided that the column is sufficiently large, because a quadratic term eventually dominates over a linear term. The same result applies to the articulated rocking frame given that its dynamic rocking response is identical to the rocking response of a single free-standing column with the same slenderness but larger size.
引用
收藏
页码:2226 / 2239
页数:14
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