Back4.1.8.11.(10)

ATTRIBUTION:

Functional Statement:

F20

To support and withstand expected loads and forces.

Objective:

OS2.1

 

APPLICATION:

Determination of seismic torsional effects by applying torsional moments about a vertical axis at each level of the building, for the structural design of structures that are not torsionally flexible.
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A and to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9] that are required to be designed in accordance with the requirements of Part 4.

INTENT:

To limit the probability that the calculation of loads due to earthquake will not take into account the forces due to expected seismic torsional moment at any level of the building, taking into account eccentricities between the centre of mass and centre of rigidity, including accidental eccentricities such as those due to stiffening provided by non-structural building elements, which could lead to structural failure, which could lead to harm to persons.
To direct Code users to Sentence 4.1.8.11.(6) for the calculation of the lateral force at each level of the building.

ATTRIBUTION:

Functional Statement:

F20

To support and withstand expected loads and forces.

F22

To limit movement under expected loads and forces.

Objective:

OP2.1, OP2.4

 

APPLICATION:

Determination of seismic torsional effects by applying torsional moments about a vertical axis at each level of the building, for the structural design of structures that are not torsionally flexible.
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A and to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9] that are required to be designed in accordance with the requirements of Part 4.

INTENT:

To limit the probability that the calculation of loads due to earthquake will not take into account the forces due to expected seismic torsional moment at any level of the building, taking into account eccentricities between the centre of mass and the centre of rigidity, including accidental eccentricities such as those due to stiffening provided by non-structural building elements, which could lead to:
  • the excessive deformation of, or excessive stress in, the structural elements, which could lead to damage to the building, or
  • the excessive deformation of, or excessive stress in, the building structure, which could lead to damage to the building, which could impede the intended use and occupancy of the building.
To direct Code users to Sentence 4.1.8.11.(6) for the calculation of the lateral force at each level of the building.

ATTRIBUTION:

Functional Statement:

F20

To support and withstand expected loads and forces.

Objective:

OS2.1

 

APPLICATION:

Determination of seismic torsional effects for structures that are torsionally flexible, where IEFaSa(0.2) is equal to or greater than 0.35.
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A and to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9] that are required to be designed in accordance with the requirements of Part 4.

INTENT:

To limit the probability that the calculation of loads due to earthquake will not take into account the forces due to the expected seismic torsional moment at any level of the building, taking into account the dynamic response of the building to maximum expected seismic ground motions, which could lead to structural failure, which could lead to harm to persons.
To direct Code users to Article 4.1.8.12. for the Dynamic Analysis Procedure.

ATTRIBUTION:

Functional Statement:

F20

To support and withstand expected loads and forces.

F22

To limit movement under expected loads and forces.

Objective:

OP2.1, OP2.4

 

APPLICATION:

Determination of seismic torsional effects for structures that are torsionally flexible, where IEFaSa(0.2) is equal to or greater than 0.35.
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A and to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9] that are required to be designed in accordance with the requirements of Part 4.

INTENT:

To limit the probability that the calculation of loads due to earthquake will not take into account the forces due to the expected seismic torsional moment at any level of the building, taking into account the dynamic response of the building to maximum expected seismic ground motions, which could lead to:
  • the excessive deformation of, or excessive stress in, the structural elements, which could lead to damage to the building, or
  • the excessive deformation of, or excessive stress in, the building structure, which could lead to damage to the building, which could impede the intended use and occupancy of the building.
To direct Code users to Article 4.1.8.12. for the Dynamic Analysis Procedure.