Structural calculation and building calculations

sazeh performs the structural calculations of a building from loading to member checks and delivers the result in a calculation sheet, currently written in Persian. All numbers come from the analysis and from the tables of the codes. Artificial intelligence only explains the result and does not guess any number.

Base shear calculation

The base shear is computed according to clause 3-3-1 of the seismic code:

• the seismic coefficient C = A·B·I / Ru and the base shear V = C·W;
• the minimum of the code, V ≥ 0.12·A·I·W, is applied, and the sheet says which of the two governed;
• the reflection factor B is built from the soil type and the period;
• A is the design base acceleration that you choose, one of four steps of seismic hazard, because a wrong step makes an error of 17% to 75% in the base shear;
• the empirical period, the distribution of force over the height, accidental torsion and the 100-30 combination are also applied.

Live load calculation

The distributed live load is read by occupancy from table 6-5-1 of the loading code:

The roof live load is 1.5 kN/m². The share of the live load that enters the seismic weight comes from table 3-1 of the seismic code. The sheet compares the mass source of the model with this table, because a model that brings only dead load into the mass silently underestimates the base shear of the whole building.

Wind load calculation

sazeh does not apply wind load. If wind governs in your project (a tall and light building, a shed, an industrial structure), it must be computed separately. The sheet prints the wind pressure and the snow load for information, but these values do not enter the analysis.

The rest of the structural calculations

• Storey drift at the diaphragm corner, with the joint and the governing combination;
• overturning according to clause 3-3-8;
• checks of concrete members against the reinforced-concrete code and of steel members against the steel code;
• support reactions for every joint, for the foundation designer;
• quantities: weight of steel, volume of concrete and a lower bound of reinforcement.

The complete list is on the features page.

The calculation sheet

The calculation sheet, currently in Persian, starts with the summary "complies or does not comply with the codes" and ends with the list of the actions needed in ETABS. The sheet is printable on A4 pages and can be turned into a PDF in the browser.

Related pages

• Structural design: concrete, steel and what is not covered
• AI structural design
• Workflow
• Limitations