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Hollow Core Slab Design
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Hollow core slabs are prestressed concrete elements that have a constant cross section. They are manufactured using high tensile strength prestressed strands which are embedded within the element. Hollow core slabs are widely used in the construction of floors in multi-storey residential, commercial, office, and industrial buildings. It is also possible to use hollow core slabs in vertical or horizontal installations as walls or noise barriers.
Standards: European
Features
- The type of prestressing strand can be selected as Standard, Super, Dyform or Stabilised with strand class of 1, 2 or 3.
- Tendon release type can be of Gradual or Sudden release. The Installation and Loading time can be chosen from the drop down.
- ECHOLLOWSLAB design module determines concrete properties at release, installation, and loading.
- Determines initial losses of prestressing force due to short term relaxation, elastic deformation, time dependent losses due to creep, shrinkage and relaxation.
- Determination of service loads and checks serviceability moments, uses iteration to determine the depth of the stress block, calculates ultimate loads and checks the ultimate moment of resistance.
- Determines shear resistance of both the cracked and uncracked sections and resistance to spalling.
- The calculation also determines the initial camber, camber after installation and long-term deflections.
Design Considerations
- The slab is considered to be single, simply supported span and subjected to only area loads.
- Section properties such as Height to neutral axis, Cross-section area, First moment of inertia and Moment of inertia are to be entered manually by the user.
- No allowance is considered for Structural concrete toppings.
- The calculation does not cover longitudinal shear check and fire resistance checks.
National Standards Available
European Standard
- • National Annex of several countries such as Europe (recommended), UK, Finland, Ireland, Malaysia, Norway, Singapore and Sweden are considered.
References
- EN1992-1-1:2004 - Design of concrete structures - Part 1-1: General rules and rules for buildings.
Revision
- Ver 1.0 - Original version
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User Manual
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