FAQ

The GIRDER-SLAB® system

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  • What procedure do I use to calculate the diaphragm shear transfer with the composite GIRDER-SLAB® system?

    Chapter 4 of the "PCI Manual for the Design of Hollow Core Slabs", Second Edition is a standard reference that engineers use to calculate horizontal shear transfer elements, i.e. collectors, chords, and drag struts. When considering the connection at the D-BEAM®, typically, the hollow core shear strength is less than the grouted beam's shear strength.

  • Can the GIRDER-SLAB® system be designed for point loads or non-uniform loading?

    Since all section properties are available, the EOR is able to calculate stresses for all loading conditions.

  • Does Girder-Slab Technologies provide assistance to the SER?

    Yes. Please call for further information. Additionally, all standard details are provided on our website.

  • I am a structural engineer who uses RAM software. How do I design your D-BEAM® girders using this software?

    For designing the GIRDER-SLAB® system in RAM engineers will let RAM select a standard WF shape but ignore the output. The engineer will then size the D-BEAM® girders from the D-BEAM® girder Design Tool located on our website. Since the D-BEAM®s are not normally used in a braced frame this procedure works well. If the D-BEAM® girders were located in a braced frame, engineers would again model it as a WF beam to obtain the axial load in the beam due to the lateral load. Then the engineer will check the D-BEAM® girder, manually, for the combined axial and bending stresses.

  • Our structural engineering firm designs multi story residential projects throughout the country. Can you give me a brief summary of how competitive the GIRDER-SLAB® system will be compared to other alternatives?

    Compared to low rise CMU or light gauge metal bearing walls the GIRDER-SLAB® system is not likely to be cost competitive. It will be very schedule and quality competitive. When comparing Girder-Slab to a CMU wall bearing system all structural CMU should be removed from the Girder-Slab design. The use of metal studs for exterior wall backup, interior walls, stairs/elevator shafts etc. (Depending on project specifics) may result in an overall savings to the project. Compared to conventional structural steel and precast hollow core slabs, the GIRDER-SLAB® system is cost competitive because the D-BEAM® girder allows you to lower the floor to floor height of the building. Compared to cast in place flat plate concrete the GIRDER-SLAB® system is very cost competitive. The GIRDER-SLAB® system is the only non proprietary, prefabricated, precast and steel system that offers significant savings while offering low floor to floor heights. Experienced steel fabricators can provide budgets and time tables from preliminary plans for your specific project so you can compare speed and cost economies. Every project is different. You must consider geographic location of your project, availability of skilled workers, building size and unique requirements. The GIRDER-SLAB® system is widely used in the Northeast, New England, and the Mid-west for high-rise (8 stories and above) or large square footage low rise buildings. The GIRDER-SLAB® system lighter building weight can save foundation, column and lateral bracing costs, and our rapid assembly process can meet special schedule demands for occupancy.

  • How high of a building can be constructed using the GIRDER-SLAB® system?

    As high as any other steel building. The D-BEAM® girder and the hollowcore plank carry the gravity loads. The height of the building is a function of lateral resisting system.

  • Can the GIRDER-SLAB® system be used as a diaphragm in a high seismic area?

    The GIRDER-SLAB® system utilizes precast concrete slabs and steel components joined compositely by grout and steel reinforcing. Both precast and steel components have been used in seismic areas. The use of standard details allows the GIRDER-SLAB® system to adapt to the high seismic environment. (Concrete topping and reinforcing is usually required.)

D-BEAM® girder
Hollowcore