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[BS] 501.1 Objective
To provide a desired level of structural performance when structures are subjected to the loads that are expected during construction or alteration and throughout their intended lives.
[BS] 501.2 Functional Statements
[BS] 501.2.1 Life Safety and Injury Prevention
Structures shall be designed and constructed to prevent injury to occupants due to loading of a structural element or system consistent with the design performance level determined in Chapter 3.
[BS] 501.2.2 Property and Amenity Protection
Structures shall be designed and constructed to prevent loss of property and amenity consistent with the design performance level determined in Chapter 3.
[BS] 501.3 Performance Requirements
[BS] 501.3.1 Stability
Structures, or portions thereof, shall remain stable and not collapse during construction or alteration and throughout their lives.
[BS] 501.3.2 Disproportionate Failure
Structures shall be designed to sustain local damage, and the structural system as a whole shall remain stable and not be damaged to an extent disproportionate to the original local damage.
[BS] 501.3.3 Loss of Amenity
Structures, or portions thereof, shall have a low probability of causing damage or loss of amenity through excessive deformation, vibration or degradation during construction or alteration and throughout their lives.
[BS] 501.3.4 Expected Loads
Structures, or portions thereof, shall be designed and constructed taking into account expected loads, and combination of loads, associated with the event(s) magnitude(s) that would affect their performance, including, but not limited to:
  1. Dead loads.
  2. Live loads.
  3. Impact loads.
  4. Explosion loads.
  5. Soil and hydrostatic pressure loads.
  6. Flood loads (mean return period).
    • Small: 100 years
    • Medium: 500 years
    • Large: Determined on a site-specific basis
    • Very Large: Determined on a site-specific basis
  7. Wind loads (mean return period).
    • Small: 50 years
    • Medium: 75 years
    • Large: 100 years
    • Very Large: 125 years
  8. Windborne debris loads.
  9. Snow loads (mean return period).
    • Small: 25 years
    • Medium: 30 years
    • Large: 50 years
    • Very Large: 100 years
  10. Rain loads. See Table 501.3.4.
  11. Earthquake loads (mean return period).
    • Small: 25 years
    • Medium: 72 years
    • Large: 475 years, but need not exceed two-thirds of the intensity of very large loads
    • Very Large: 2,475 years. At sites where the 2,475-year, 5-percent damped spectral response acceleration at a 0.3-second period exceeds 1.5 g and at a 1-second period exceeds 0.6 g, very large ground shaking demands need not exceed a 5-percent damped response spectrum that at each period is 150 percent of the median spectral response acceleration ordinate resulting from a characteristic earthquake on any known active fault in the region.
  12. Ice loads, atmospheric icing (mean return period).
    • Small: 25 years
    • Medium: 50 years
    • Large: 100 years
    • Very Large: 200 years
  13. Hail loads.
  14. Thermal loads.
RAIN LOADS
MAGNITUDE OF EVENTDRAINAGE SYSTEMMRI (YEARS)STORM DURATION (MIN.)
SmallPrimary2560
SmallSecondary2515
MediumPrimary5060
MediumSecondary5015
LargePrimary10060
LargeSecondary10015
Very LargePrimary10030
Very LargeSecondary10010
[BS] 501.3.5 Safety Factors
The design of buildings and structures shall consider appropriate factors of safety to provide adequate performance from:
  1. Effects of uncertainties resulting from construction activities.
  2. Variation in the properties of materials and the characteristics of the site.
  3. Accuracy limitations inherent in the methods used to predict the stability of the building.
  4. Self-straining forces arising from differential settlements of foundations and from restrained dimensional changes due to temperature, moisture, shrinkage, creep and similar effects.
[BS] 501.3.6 Demolition and Alteration
The demolition or alteration of buildings and structures shall be carried out in a way that avoids the likelihood of premature collapse.
[BS] 501.3.7 Site Work
Site work, where necessary, shall be carried out to provide stability for construction on the site and avoid the likelihood of damage to adjacent property.

Related Code Sections

Section 501 Stability, Structural Forces
To provide a desired level of structural performance when structures are subjected to the loads that are expected during construction or alteration ...
Section 501 Stability, Structural Forces
To provide a desired level of structural performance when structures are subjected to the loads that are expected during construction or alteration ...
501.3 Stability, Performance Requirements
Structures, or portions thereof, shall remain stable and not collapse during construction or alteration and throughout their lives ...
501.2.1 Stability, Life Safety and Injury Prevention
Structures shall be designed and constructed to prevent injury to occupants due to loading of a structural element or system consistent ...
501.2.1 Stability, Life Safety and Injury Prevention
Structures shall be designed and constructed to prevent injury to occupants due to loading of a structural element or system consistent ...