Concrete Grid Beam

A waffle slab or two way joist slab is a concrete slab made of reinforced concrete with concrete ribs running in two directions on its underside.

Concrete grid beam.

It consists of a reinforced concrete beam that transmits the load from a bearing wall into spaced foundations such as pile caps or caissons. Section of a waffle slab including beam ribs and column head. Wholistically it forms a structural skeleton for the building which is used to support other members such as floors roof walls and claddings. Grade beams are commonly concrete beams which are designed to act as horizontal ties between footings or pile caps.

The load is transferred directly from slab to column in the flat slab. It is used in conditions where the surface soil s load bearing capacity is less than the anticipated design loads. An assembly of intersecting beams placed at regular interval and interconnected to a slab of nominal thickness is known as grid floor or waffle floor. Stabilized by the grid beam system together with soil nail installation see fig.

Continuous grid beam structures made of concrete have been used for many years in china to stabilize the natural and man made slopes. In this type of floor a mesh or grid of beams running in both the directions is the main structure and the slab is of nominal thickness. A grade beam differs from a wall footing because a grade. 25 mm in diameter and 16 l ft 5 0 m long were installed to cover the target area of 5442 yd 2 4550 m.

For example a 20 20 ft grid could have one intermediate beam so 3 ply clt floor panels spanning 10 ft can be used. Concrete frame construction is a construction method which comprises a network of columns and beams to transfer the loads coming onto the structure to the foundation successfully. Waffle slabs are preferred for spans greater than 40 feet as they are much stronger than flat slabs flat slabs with drop panels two way slabs one way slabs and one way joist slabs. The main difference between flat slab conventional slab beam system is that the one is directly supported on the column while another system has a beam for support.

Generally this slope stabilization structure is called grid beam. They should be reinforced with continuous reinforcement that is developed within or beyond the supported column or be anchored within the pile cap or footings as per aci 318 14. The dimension of the grid beam cross section was 12 x 12 in. Figure1shows a typical application of continuous grid beam structure on a man made slope.

At intersections of the concrete grid beams 1157 pieces of soil nail 1 in. Larger square grids such as 28 28 or 30 30 ft with one intermediate beam can also be used. In conventional slab beam system the load is transferred from slab to beam and ultimately beam to the column. A structural reinforced concrete continuous beams at an intermediate building floor provides gravity load resistance for the applied dead and live loads.