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How does ideCAD control the Column-Beam Moment Ratio according to AISC 341-16?
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For structures with a seismic force-resisting system, the linear-inelastic behavior of the
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structural system under the design earthquake is
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considered. Although it is different for each type of steel
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structural system, the system is aimed
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at reaching the most appropriate mechanism. Accordingly, linear-inelastic deformations are only allowed in certain
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members. The structure is
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dimensioned according to this behavior model.
In moment-resisting steel frames
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, these
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members are beams. The regions
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defined for
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the plastic hinges are certain regions at the ends of the beams connected to the columns.
These parts, which are
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called the protected zones, absorb energy with linear-inelastic behavior, while the other parts must remain with linear-elastic behavior.
Columns
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must be stronger than beams
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to prevent brittle collapse, except for the intended mechanism.
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The sway mechanism is preferred in Figure (a), while in Figure (b), the
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soft story mechanism is not desired. As
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shown in Figure (b), when the hinges are formed at the ends of the columns, this
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situation
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leads to brittle collapse.
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