ASDIP Concrete – Concrete Beams Design

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Beams are structural elements that support loads applied transversely, and therefore they mostly resist bending moments, as well as shear forces. Concrete beams are usually continuous, this is, they span between several supports. A common example of a T-beam occurs at the interior bay of a building floor, where a portion of the slab acts together with the projecting beam web. A beam at the border of the floor is called a spandrel beam.

The program performs the design of a multi-span rectangular, T, or inverted-T concrete beam when subjected to a combination of bending and shear loading, based on the latest ACI design criteria and the Ultimate Strength Design Method. Multiple options are included to model the beam geometry and loads, as well as the reinforcing steel.

Input Data

The required input data is organized on tabbed pages at the left half of the screen. The beam cross section may be either rectangular, T, spandrel, inverted-T, or L. A maximum of five spans may be modeled and two cantilevers. The end supports may be either pinned or fixed.

The program uses either the actual parabolic concrete stress-strain curve, or the simplified equivalent rectangular one. The steel considers the strain hardening region.

Distributed and concentrated loads may be modeled as part of the dead, live, roof live, and snow load cases. The program internally combines the applied loads per the specified load combinations.

Example

Design a 2-span continuous beam, 15-ft long each, which is a T-beam in a cast-in-place concrete office building. The beam dimensions are 12″ x 24″ and is cast monolithically with a 6″ thick slab.

The beam is subjected to the uniformly distributed and concentrated loads shown. Find the bending moment and shear force diagrams and design the reinforcement.

Output

The output results are organized on tabbed pages at the right half of the screen. The program calculates the moments and shears along the beam for all the specified load combinations. Then the capacity is accurately calculated based on the geometry and reinforcement, considering the moment gradient due to the development length of all the rebars.

The program allows to show the beam per span number and per load combination, for a granular check of the whole design process. The construction graph shows a scaled sketch of the beam elevation with information of the reinforcement.

For a more detailed information please read our blog posts Concrete Continuous Beams – A Design Challenge, and also How to Design Continuous Beams with ASDIP Concrete