Structural Engineering Quiz

What is considered a Type 1 vertical irregularity?

• Vertical Geometric irregularity

• Weight (mass) irregularity

• In plane discontinuity in vertical lateral-force resisting element

• Stiffness irregularity-soft story

When does a Type 2 vertical irregularity exist?

• When there is an in-plane offset of the lateral load resisting elements greater than the length of those elements

• When the horizontal dimension of the lateral force resisting frame system in any storey is more than 130 percent of that in the adjacent storey

• When the storey stiffness is less than 70 percent of that of the storey above

• When the effective mass of any storey is more than 150% of the effective mass of an adjacent storey

What is a Type 3 vertical irregularity based on?

• Abrupt discontinuities or variations in stiffness in diaphragms

• Storey stiffness less than 80% of that in the storey above

• In-plane offset of lateral load resisting elements

• Vertical geometric irregularity

When does a Type 4 vertical irregularity occur?

• When the plan configuration contains re-entrant corners

• When the vertical lateral load resisting elements are non parallel to major orthogonal axes

• When there are discontinuities in a lateral path

• When the storey strength is less than 80% of that in the storey above

What defines a Type 1 torsional plan irregularity?

• Re-entrant corners in the lateral force-resisting system

• Discontinuities in a lateral path

• Abrupt discontinuities or variations in stiffness in diaphragms

• Maximum storey drift at one end of the structure transverse to an axis is more than 1.2 times the average of the storey drifts of the two ends

When does a Type 2 re-entrant corner irregularity exist?

• When the horizontal dimension of the lateral force resisting frame system in any storey is more than 130 percent of that in the adjacent storey

• When there are discontinuities in a lateral path

• When the plan configuration contains re-entrant corners

• When diaphragms have abrupt discontinuities or variations in stiffness

What defines a Type 3 diaphragm discontinuity irregularity?

• When the vertical lateral load resisting elements are non parallel to major orthogonal axes

• Abrupt discontinuities or variations in stiffness in diaphragms

• When there are discontinuities in a lateral path

• When the plan configuration contains re-entrant corners

When does a Type 4 irregularity occur?

• When the storey strength is less than 80% of that in the storey above

• When there are discontinuities in a lateral path

• When the plan configuration contains re-entrant corners

• When the vertical lateral load resisting elements are non parallel to major orthogonal axes

What is considered a Type 5 nonparallel system irregularity?

• When the plan configuration contains re-entrant corners

• When the vertical lateral load resisting elements are non parallel to major orthogonal axes

• When the storey strength is less than 80% of that in the storey above

• Abrupt discontinuities or variations in stiffness in diaphragms

What defines a Type 5 nonparallel system irregularity?

• When the vertical lateral load resisting elements are non parallel to major orthogonal axes

• Abrupt discontinuities or variations in stiffness in diaphragms

• When the plan configuration contains re-entrant corners

• When there are discontinuities in a lateral path