Site Load Testing of Full Scale Composite Concrete Floors

by Patrick Sullivan, Univ London, United Kingdom,



Document Type: Proceeding Paper

Part of: Structural Engineering in Natural Hazards Mitigation

Abstract:

The paper presents the results of a load test carried out in 1982 on a continuous reinforced concrete slab with a permanent shuttering consisting of compressed straw (Stramit) or cement bound wood wool fibres forming a trapezoidal T-shaped flooring system. Twenty years after construction, a fire burnt the permanent forms exposing honeycombed concrete within the webs of the T's and inadequate reinforcing detailing. The slabs and reinforcing bars were instrumented with electrical resistance strain gauges and vibrating wire gauges at critical points and transducers were placed at various locations on and below the slab to measure maximum sagging and hogging deflections. Clinometers were also installed at the top side of the slabs to measure any rotations taking place. Loading up to 1.25 x design load was carried out at night to minimise the effect of temperature.

Subject Headings: Reinforced concrete | Load tests | Concrete slabs | Slabs | Load factors | Floors | Thermal loads

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