Designing a heavier structure makes the structure even heavier with additional elements recursively. As the self-weight of the structure increases, the effects of earthquake forces, deflections on the floor, etc. will also increase. Depending on the ground conditions, as the structure gets heavier the ground improvement costs may increase exponentially.
The design of traditional one way ribbed slabs with EPS (Styrofoam) or hollow brick fillings, has been limited by rules and regulations.
Instead, two way ribbed slabs can be constructed. However, in this design, filling the two way ribbed gaps with EPS, hollow brick or aerated concrete, especially in housing projects, should be evaluated carefully. While EPS fillings can pose a serious fire risk due to gas compression, toxic smoke emission and/or contribution to the fire by dripping, hollow brick/aerated concrete fillings also have a risk of falling during an earthquake.
A voided slab system reduces the weight and thickness of the slab, increasing the earthquake resistance of the structure without compromising performance attributes of a flat slab. What is voided slab system? – Read more…
Boşluklu döşeme sistemi, kirişsiz (mantar) döşemenin performans özelliklerinden ödün vermeden döşeme plağının ağırlığını azaltan, yapının deprem performansını artıran bir sistemdir.
Voided slabs are constructed biaxialy through the use of cube shaped disposable formworks made of recycled PP that are placed between lower and upper steel reinforcement. Casting of concrete is always in-situ. How is voided slab system applied? Read more…
Boşluklu döşeme, geri dönüşümlü polipropilenden (PP) imal edilmiş kör kalıpların alt ve üst donatı arasına döşemenin her iki yatay doğrultuda çalışacağı şekilde yerleştirilmesi ve betonun yerinde dökülmesi ile elde edilir.
Slabs designed with the voided slab system can reduce the weight of the building by up to 25% compared to flat slabs.
Compared to ribbed slab, voided slab system increases the earthquake resistance of the structure by creating a more rigid diaphragm. Additionally, it eliminates the risk of fire with EPS fillings since it constructs a concrete flat ceiling. Read more…
Sample floor plan
When modeling a voided slab system, first the moment of inertia, unit volume and cross-sectional area of the 𝙸 section formed by the disposable formworks is calculated. Equivalent section coefficients are obtained by comparing voided slab cross section values with flat slab section values. The voided slab model is created by multiplying these coefficients with relevant parameters such as effective section stiffness, modulus of elasticity and concrete unit volume weight in the structural design software used. How to model voided slab system? Read more…
We are at your service with our civil engineers who have been working with us since our establishment in 2011, the most knowledgeable about voided slab design and the most experienced in field supervision.
Fill in the form below or call us at +90 216 518 02 55 to contact our experienced engineers to get more information, study your project and get a quotation for voided slab system.
As ABS Yapı Elemanları, we can provide all civil engineering services partially or fully for the entire project. However, we can also provide information and support to client’s civil engineers through modeling guides, laboratory reports, university reports and sample project designs.
When it is time for installation, we produce the materials in accordance with the design and deliver them to the construction site on time. We provide on-site supervision to the formwork and steel teams during installation of the disposable formworks and concrete casting. We provide necessary guidance to all on-site teams for a correct implementation of the system.
Consumption of concrete and steel reinforcement varies depending on the project. The slab thickness and Volimax disposable formwork height are determined according to the column spans between columns and walls and to the design loads of the project.
If we need to give an approximate ratio, for 6-7 m column spans, the consumption of concrete in the slab decreases by 20-25% and reinforcement consumption by 15-20%. Since this reduction reduces the self-weight of the entire structure, a reduction is also provided in the earthquake loads and loads on the foundation. While the reduction of the earthquake loads provides convenience and material savings in the structural design, the reduction of the loads on the foundation both reduces the foundation thickness and provides great savings in ground improvement costs where needed. By decreasing the self-weight of the structure, additional reductions can be achieved recursively in column & shear wall dimensions. Thus, significant additional savings can be achieved in the total amount of reinforcement.
Consumption of concrete and reinforcement varies depending on the project. The slab thickness and Volimax formwork height are determined according to the column spans between columns and walls in the project and account loads.
After the thickness of the slab is determined, it will be designed as a beamless slab, as it is in two way ribbed slabs, there is no need for stirrup winding at every 70 cm. Therefore, 10-15% of reinforcement savings can be achieved. As the slab loads will decrease depending on the material used as ribbed slab filling, optimization can also be made in column/shear wall sizes.
As the column span increases, the reinforcement and concrete savings provided by the hollow flooring system will also increase.
We are at your service with our civil engineers who have been working with us since our establishment in 2011, the most knowledgeable about voided slab design and the most experienced in field supervision.
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