Esta ferramenta realiza verificações de projeto e conformidade para lajes de vigas reforçadas de acordo com AS 2870:2011. Os cálculos são baseados no Método Simplificado para Projetos de Jangadas descrito em AS 2870 Cláusula 4.5, que é uma extensão dos valores considerados conformes previstos na Cláusula 3.2. O método simplificado permite a extensão e modificação dos valores considerados conformes para atender às mudanças exigidas pelo engenheiro de projeto, evitando a necessidade de análises 3D complexas da interação estrutura/solo.

Este método é compatível com lajes com carga distribuída de projeto de até 10kPa, e uma carga projetada na linha de borda de até 25 kN/m. Cláusula 4.5 tem um conjunto de condições estritas que devem ser satisfeitas para uso, incluindo espaçamento máximo do feixe, profundidades mínimas de viga e armadura mínima de laje. Esta ferramenta realiza inicialmente uma Cláusula 4.5 verificação de adequação, seguido por verificações de rigidez e resistência de acordo com a Cláusula 4.5.2 e Cláusula 4.4(f).

Esta calculadora também pode ser usada para exportar um desenho de plano de engenharia com um cronograma detalhado de reforço de vigas.

AS 2870 has an extensive range of deemed-to-comply designs for stiffened rafts, footing slabs, waffle rafts and stiffened slabs with deep edge beams, outlined in Section 3 of the standard. These tabulated values allow designers to specify compliant designs without carrying out structural stiffness/capacity calculations. Contudo, AS 2870 also provides guidance for designs which are outside the scope of the deemed-to-comply values for stiffened raft slabs, allowing designers to customise their designs to suit desired site geometry and beam dimensions. The method for modifying deemed-to-comply raft designs is outlined in AS 2870 Cláusula 4.5.

The Simplified Method for Raft Designs comprises the following:

1. Suitability Check: Cláusula 4.5 has a series of criteria that a slab must meet to be suitable for the Simplified Method. These criteria include maximum beam spacing, profundidades mínimas de viga e armadura mínima de laje.
2. Solo & Settlement Parameters: The soil classification and maximum differential deflection must be determined based on the expected surface movement (Y_s) and method of wall construction.
3. Stiffness Check: The stiffness of any thickened beams in the raft slab must be checked. The required stiffness is obtained from Figure 4.1, based on the soil classification and expected surface movement.
4. Força & Ductility Check: Cláusula 4.4 requires all beam sections to have sufficient reinforcement so that the ultimate strength (M_você) é 20% greater than the cracking moment calculated using AS 3600 Cláusula 8.1.6.1(1). The beams must also have sufficient reinforcement to satisfy the minimum reinforcement requirements of AS 3600 Cláusula 8.1.6.1(2).

O AS 2870 Residential Slab Design Calculator has the following inputs:

• Laje / Beam Geometry: Comprimento, width and depth of all structural elements within the slab.
• Reinforcement Details: Slab and beam reinforcement. Inputs can be mesh reinforcement or deformed rebar.
• Geotechnical Parameters: Moisture change properties of the subgrade material and expected surface movement, obtained from geotechnical investigation.
• Loading Inputs: Design distributed and edge line loading around slab perimeter.
• Propriedades do Material: Concrete strength and reinforcement yield stress.

O AS 2870 Residential Slab Design Calculator provides the following outputs:

• Soil classification and maximum differential deflection.
• Cláusula 4.5 suitability checks.
• Stiffness check of edge / internal beams.
• Ductility and strength check of edge / internal beams.

O AS 2870 Residential Slab Design Calculator has the following assumptions and limitations:

• This calculator is only intended for rectangular slabs (No plano). For non-rectangular plans, design for strength/ductility should be based on the overlapping rectangles method. Refer AS 2870 and associated commentary for further guidance.

• Calculations for minimum reinforcement requirements are based on AS 3600 Cláusula 8.1.6.1. This tool includes the contribution of the slab as a flange for minimum reinforcement requirements but does not include contribution of the flange for section moment capacity.
• This tool ignores the contribution of compression reinforcement for section moment capacity.
• This tool uses AS 3600 for calculation of concrete flexural tensile strength, rather than the prescribed values in AS 2870.
• The curve equations for Figure 4.1 graphs were developed using regression analysis of known values, as no official equations are available.

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