Load Combinations are a critical aspect of design. It is important to ensure you are correctly applying the relevant design load combinations to ensure the minimum design requirements of your local design code are being met. Here, SkyCiv has released a summary of the design combinations integrated in our Structural Analysis Software for engineers to use as a reference. We have included the load combos for ASCE 7-10, AS/NZ 1170, ACI, NBCC and EN 1990.
ASCE 7 10 is a design code for the United States; focussing on the minumum requirements for structural design in the US. With this design standard, it provides the recommended load factors and load combinations to be applied to each of the load types (wind, snow, dead etc..) and is particularly useful for design codes such as AISC 360 - Structural Steel Buildings. This design standard comes with two provisions;
- ASD - Allowable Strength Design
- LRFD - Load and Resistance Factor Design
Below are the summarized load combination factors for ASCE 7-10 based on their provisions:
ACI 318 is a US concrete design standard released by the American Concrete Institute specifying the minimum design loads and load factors for concrete structures. Fundamentally, all structures/structural members should possess design strengths at all sections at least equal to the required strengths calulated for the factored loads and forces in combinations.
Chapter 9 of the code details the strength and serviceability load combination requirements of structural members:
NBCC 2010 is the Canadian provision for the design and construction new buildings. It provides minimum technical provisions for the design and construction of new buildings. For the purposes of Canadian load combinations, Part 4 of the design code provides specifications for limit states design:
The Eurocodes are a set of standards for how structural design should be conducted within the European Union. EN 1990:2002 (ECO) sets out the basis of structural design whereas EN 1991 (EC1) specifies the actions on structures. In conjunction, these two documents provide a methodology for the Eurocode load combinations of actions for limit states design. The ultimate limit states for loss of equilibrium (EQU), internal failure (STR), ground deformation (GEO) need to be checked together with accidental/seismic (ALS) and servicibility limit states (SLS) when appropriate.