The Structural Engineer > Archive > Volume 50 (1972) > Issues > Issue 1 > Correspondence Notes on a Failure: Wood-wool Slabs used as Permanent Shuttering
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Correspondence Notes on a Failure: Wood-wool Slabs used as Permanent Shuttering

A reinforced concrete office block of 7 storeys was recently damaged by IRA bomb attack. The bomb was placed on the first floor in an end bay and opposite to a staircase, and did considerable structural damage. The bay of first floor on which the bomb was placed was demolished and a hole was blown in the second floor slab above. This, together with damage to external columns, wall beam and solid end gable were all that might have been expected from the size of the bomb employed. However, and at first sight without explanation, large areas of the 6 in thick 'flat-slab' first floor were also damaged. In spite of the fact that these bays could have suffered only from secondary or reflected blast, deflexions of up to 8 in appeared in the middles of several of the 15 ft square bays.