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Composite Section

Calculates transformed section properties for a simplified steel I-girder with concrete slab and haunch using the modular ratio method. The template reports transformed area, neutral axis, second moment of area, and top and bottom section moduli.

inputs

11 fields

context

2 archetypes

engine

with-tool

outputs

5 scored fields

contract fields

Parameter Map

11 inputs to 5 scored outputs

  • top_flange_width_mm

    float

    Steel top flange width

    50 to 2000mm
  • top_flange_thickness_mm

    float

    Steel top flange thickness

    5 to 150mm
  • web_depth_mm

    float

    Clear steel web depth between flanges

    100 to 5000mm
  • web_thickness_mm

    float

    Steel web thickness

    5 to 100mm
  • bottom_flange_width_mm

    float

    Steel bottom flange width

    50 to 2000mm
  • bottom_flange_thickness_mm

    float

    Steel bottom flange thickness

    5 to 150mm
  • slab_width_mm

    float

    Effective concrete slab width

    100 to 10000mm
  • slab_thickness_mm

    float

    Concrete slab thickness

    50 to 500mm
  • haunch_width_mm

    float

    Concrete haunch width

    50 to 3000mm
  • haunch_thickness_mm

    float

    Concrete haunch thickness

    10 to 500mm
  • modular_ratio

    float

    Steel-to-concrete modular ratio

    1 to 20
transformed_area_mm2tol 0.03

Transformed composite section area

neutral_axis_from_bottom_mmtol 0.03

Neutral axis from bottom of steel section

transformed_inertia_mm4tol 0.03

Transformed second moment of area

bottom_section_modulus_mm3tol 0.03

Bottom section modulus

top_section_modulus_mm3tol 0.03

Top section modulus

visibility contract

Difficulty Ladder

all_giveneasy

All parameters given for a rolled girder

all fields visible
all_givenmedium

All parameters given across composite girder types

all fields visible
all_givenhard

All parameters given for a bridge plate girder

all fields visible

scenario bands

Archetype Atlas

plate_girder

2 contexts

Bridge plate-girder composite section

top_flange_width_mm300 to 700
top_flange_thickness_mm20 to 60
web_depth_mm900 to 2500
web_thickness_mm10 to 30

bridge-plate-girder / composite-road-bridge

rolled_girder

2 contexts

Rolled-girder composite section

top_flange_width_mm150 to 350
top_flange_thickness_mm10 to 35
web_depth_mm400 to 1000
web_thickness_mm8 to 20

rolled-girder-bridge / short-span-composite-deck

rendered task

Generation Preview

bridge-plate-girder-plate-girder-preview

difficulty
hard
visibility
all_given
archetype
plate_girder
site context
bridge-plate-girder
instruction excerptcomposite-section_calc.py

visible fields

  • top_flange_width_mm300 to 700 mm
  • top_flange_thickness_mm20 to 60 mm
  • web_depth_mm900 to 2500 mm
  • web_thickness_mm10 to 30 mm
  • bottom_flange_width_mm400 to 900 mm
  • bottom_flange_thickness_mm25 to 80 mm
  • slab_width_mm2000 to 5000 mm
  • slab_thickness_mm180 to 300 mm
  • haunch_width_mm300 to 800 mm
  • haunch_thickness_mm50 to 200 mm
  • modular_ratio6 to 12

withheld schema

transformed_area_mm2neutral_axis_from_bottom_mmtransformed_inertia_mm4bottom_section_modulus_mm3top_section_modulus_mm3
Bridge plate-girder composite section. bridge-plate-girder. Required outputs: transformed_area_mm2, neutral_axis_from_bottom_mm, transformed_inertia_mm4, bottom_section_modulus_mm3, top_section_modulus_mm3