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Check concrete members and make seismic loads
Set up the bars of concrete beams and columns of the open model, check them to ACI 318-19, make equivalent lateral forces to ASCE 7-22 on rigid floors, and see storey drift. An aid for an engineer to check.
Written for BimCraft 0.8. The same help is inside the app: press F1.
The Concrete members and Seismic loads blocks in the Analysis tab check reinforced concrete beams and columns of the open IFC, and make the sideways forces of an earthquake on the floors of its frame. They are the same blocks as DetailCraft's, run after the Analysis tab's analysis, and saved in the IFC with the other analysis settings.
What BimCraft reads
The analysis reads the model's beams, columns and braces with their profiles (see Analyse the structural frame). The Concrete members block lists every section they use. Press Set up as concrete… on a section that is concrete: BimCraft takes a rectangle from the profile's area and stiffness (the width b and depth h you can then change), so a section that is not close to a rectangle (a rolled steel shape) gives a size you must correct, or is left alone.
A section set up as concrete, and any element whose material is named concrete, is analysed as concrete: E = 4700 √f′c, 2400 kg/m³, and by default with cracked sections (columns 0.70 Ig, beams 0.35 Ig; ACI 318-19 Table 6.6.3.1.1(a)). Choose Gross sections to turn that off. Without these settings the model is analysed exactly as before.
Bars, combinations, check
Give the cover, the top, bottom and side bars (or a column cage) and the ties of each section, set f′c, fy, fyt, K and sway or non-sway. Give the load cases their kind, press Make combinations (ASCE 7 §5.3.1) and then Check concrete: each member gets a utilisation, coloured on the model. Members over capacity, and a storey drift over its limit, are listed in Problems with their clause; click one to select the element.
Floors and seismic loads
In the Seismic loads block Find floors takes the levels where two or more beams meet; each becomes a rigid diaphragm. Take weights from cases reads each floor's seismic weight from the cases you give a factor. Fill in SDS, SD1, S1, R, Ie, Cd, TL, the system and the risk category, then Make seismic cases (ASCE 7-22 12.8: period, base shear, distribution up the floors, 5 % accidental torsion). The storey forces and the drift check (12.12) show after a run. The same period and storey stiffness feed the earthquake in Play a flood, wind or an earthquake when you pick the analysis frame as its source.
Slabs and walls of concrete become plates in the analysis, and the Slab reinforcement block works out the steel they need per metre. The details of every check are in DetailCraft's topic of the same name.