DISEÑO DE PEDESTALES DE CONCRETO

Design of Reinforced Concrete Pedestals

In this video, the design of reinforced concrete pedestals is discussed. These structures transfer loads from a metal column through the floor to the foundation footing to prevent corrosion. The guide covers calculating dimensions, steel reinforcements, and practical design examples.

Calculating Dimensions and Steel Reinforcements

• Pedestals support metal columns from foundation soil, typically square in geometry.

• Controlled perimeter fill around pedestals prevents lateral movements for tall elements.

• Designing a pedestal supporting a metal column involves considering ultimate design load, concrete strength, and foundation dimensions.

Dimension Calculation and Steel Reinforcement

• Pedestal height is crucial for accommodating ground elements; base connects to metal column via anchor bolts.

• Initial pedestal dimension estimation suggests sides at least 150mm larger than base plate with concrete thickness between 100-250mm.

• Minimum pedestal dimension calculated based on base plate extension; later verified against compression load criteria.

Steel Reinforcement Considerations

• Longitudinal steel area proposed should exceed 1% of cross-sectional area; must be greater than total anchor bolt area.

• Pedestal's steel area must surpass 1% of its cross-section and not fall below total anchor bolt area.

• Correct reinforcement layout confirmed with minimum cover of 4cm uniformly distributed around all sides.

Compression Load Analysis and Stirrup Design

• Utilizing pressure to calculate action resistance with safety factor; verifying load-bearing capacity against ultimate load requirement.

• Stirrups designed based on proposed bar size; spacing determined by upper and lower zone requirements related to critical areas.

Final Design Considerations

• Stirrup separation varies based on location within the pedestal structure; length determined by specific criteria ensuring structural integrity.

[Detailed Summary of Transcript in English]

Design and Construction of Pedestals

This section discusses the design and construction details of pedestals, focusing on key aspects such as armament, spacing, and filling considerations.

• The critical zone extends 60 centimeters from the top level. Stirrups displace by 10 centimeters at the bottom with 20 centimeters at the top. The graphic illustrates the assembly based on prior details, emphasizing stirrup spacing in the upper zone.

• The pedestal assembly comprises 14 bars with interior plates for support on the footing grill. This method is common for reinforced concrete pedestals. Bolts for anchoring the base plate must be embedded correctly within the confined core.

• Recommendations include limiting stirrup protrusion to preferably 20 centimeters but no more than 25 centimeters. Spacing should halve towards the upper end of the pedestal, with length equal to its longer side. Proper backfilling is crucial to prevent settling and cracks.

• Careful backfilling around and beneath the base is essential to avoid sinkage and floor cracks. For long pedestals, compacted layer-wise filling of 20-25 centimeters ensures lateral support and prevents bulging.