Precast Prestressed Planks Design & Detailing
The use of precast planks as a design option for roofing over our semi-basement garage seems to most as being the one and only option. If the ‘perit’ proposes a reinforced concrete slab design, then he is only doing so to make him pay more money on the total construction costs. But how much of this is true? Is there really a cost factor between the use of precast planks and cast in-situ concrete?
- Reinforced spreader beams along the entire length of the precast plank supports;
- Concrete topping with mesh reinforcement above the precast planks. This is mostly important to eliminate differences in camber and elevation between adjacent planks at the joints and to evenly distribute loadings over adjacent planks. Reinforcement should be lapped with the spreader beams reinforcement in order to achieve adequate tying action;
- Alternatively, loose reinforcement should be provided between the concrete grouting of the precast planks as per tying reinforcement requirements