Anchorage & Lapping

Conventional steel bars rely entirely on the adhesion between the bar surface and concrete to provide the necessary bond for anchorage. This is usually achieved by having surface deformations or provision of hooks to provide the required surface area for developing the necessary anchorage.

Unlike steel bars, EM fabric enable positive mechanical anchorage through the connected cross-wire welded at each intersection. Once EM fabric is embedded in the concrete, the anchorage of the fabric required to develop tensile stresses within the wires is provided by the embedment of the cross-wire. With the weld sheer strength exceeding half the characteristic yield strength (250 N/mm2) of the wire, an embedment of two welds will develop sufficient anchorage strength equal to the characteristic yield strength (485 N/mm2).

Therefore, the bond between the wire surface and concrete becomes additional anchorage. Full yield strength can be achieved with an overlapping of two welds of the fabric (Fig 1) and usually used in the lapping for the bottom of suspended slabs. While half yield strength can be achieved when the fabric are overlapped by one weld (Fig 2) and widely applied in lapping of top fabrics.



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