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Sls Load Combinations

Computes serviceability limit state load combinations for structural deflection checks using AS/NZS 1170.0 Table 4.1. Determines short-term and long-term combination factors from the imposed-action category, applies them to dead and live loads, adds wind serviceability actions where applicable, and identifies the governing SLS combination for design.

inputs

4 fields

context

7 archetypes

engine

with-tool

outputs

6 scored fields

contract fields

Parameter Map

4 inputs to 6 scored outputs

  • dead_load_kn

    float

    Permanent (dead) load G acting on the member

    1 to 500kN
  • live_load_kn

    float

    Imposed (live) load Q acting on the member

    1 to 400kN
  • wind_serviceability_kn

    floatoptional

    Serviceability wind action W_s on the member (zero if wind not applicable)

    0 to 150kN
  • load_category

    enumfrom archetypehidden in hard

    Imposed-action category per AS 1170.1 (A = domestic, B = offices, C = public assembly, D = retail, E = storage)

    ABCDE
psi_stol 0.01

Short-term combination factor from AS/NZS 1170.0 Table 4.1

psi_ltol 0.01

Long-term combination factor from AS/NZS 1170.0 Table 4.1

sls_short_term_kntol 0.03

Short-term SLS combination G + psi_s * Q (kN)

sls_long_term_kntol 0.03

Long-term SLS combination G + psi_l * Q (kN)

sls_wind_kntol 0.03

Wind SLS combination G + psi_s * Q + W_s (kN)

governing_sls_kntol 0.03

Governing (maximum) SLS combination value (kN)

visibility contract

Difficulty Ladder

all_giveneasy

All parameters given including category, no wind action — straightforward factor lookup and arithmetic

all fields visible
all_givenmedium

All parameters given, includes wind serviceability actions across multiple categories

all fields visible
partialhard

Load category hidden — agent must infer the correct psi factors from the building use description

load_category

scenario bands

Archetype Atlas

residential_floor

2 contexts

Residential house floor with light dead load and domestic imposed loads

dead_load_kn5 to 30
live_load_kn3 to 20
wind_serviceability_kn0
load_categoryA

suburban-house-timber-floor / townhouse-concrete-slab

office_floor

2 contexts

Office building floor with moderate dead and live loads

dead_load_kn20 to 80
live_load_kn15 to 60
wind_serviceability_kn0 to 10
load_categoryB

cbd-office-tower-floor / suburban-office-park-slab

assembly_floor

2 contexts

Public assembly area such as a theatre or restaurant floor

dead_load_kn25 to 100
live_load_kn20 to 80
wind_serviceability_kn0 to 15
load_categoryC

convention-centre-mezzanine / stadium-concourse-slab

retail_floor

2 contexts

Retail/shopping floor with moderate imposed loads

dead_load_kn15 to 70
live_load_kn10 to 50
wind_serviceability_kn0 to 8
load_categoryD

shopping-centre-ground-floor / mixed-use-retail-podium

storage_floor

2 contexts

Storage or warehouse floor with heavy imposed loads

dead_load_kn30 to 150
live_load_kn40 to 200
wind_serviceability_kn0 to 5
load_categoryE

logistics-warehouse-slab / cold-store-mezzanine

exposed_office_with_wind

2 contexts

Office building member exposed to serviceability wind on an upper storey

dead_load_kn30 to 120
live_load_kn20 to 80
wind_serviceability_kn5 to 60
load_categoryB

coastal-office-tower-facade / high-rise-office-beam

assembly_with_wind

2 contexts

Public assembly structure with significant serviceability wind actions

dead_load_kn40 to 200
live_load_kn30 to 150
wind_serviceability_kn10 to 80
load_categoryC

grandstand-roof-beam / airport-terminal-long-span

rendered task

Generation Preview

cbd-office-tower-floor-office-floor-preview

difficulty
hard
visibility
partial
archetype
office_floor
site context
cbd-office-tower-floor
instruction excerptsls-load-combinations_calc.py

visible fields

  • dead_load_kn20 to 80 kN
  • live_load_kn15 to 60 kN
  • wind_serviceability_kn0 to 10 kN

withheld schema

load_categorypsi_spsi_lsls_short_term_knsls_long_term_knsls_wind_kngoverning_sls_kn
Office building floor with moderate dead and live loads. cbd-office-tower-floor. Required outputs: psi_s, psi_l, sls_short_term_kn, sls_long_term_kn, sls_wind_kn, governing_sls_kn