Testing of Concrete in Structures: Fourth Edition

150 Load testing and monitoringFigure 6.9 Measurements on suspended weights (photograph by courtesy of G.B.G.Structural Services).transducer (Figure 6.10) will enable a visual on-site capability together witha complete data logging of the load test displacements for later retrieval, processingand presentation. Gauges will normally be located at midspan and1/4 points (Figure 6.11) to check symmetry of behaviour. If the memberis less than 150 mm in width, one gauge located on the axis at each pointshould be adequate, but pairs of gauges as in Figure 6.11 should be used forwider members. The selection of gauge size will be based on the expectedtravel, and although gauges can be reset during loading this is not recommended.The gauges must be set so that they can be easily read with aminimum of risk to personnel and so that the chance of disturbance duringthe test is small. Telescopes may often be convenient for this purpose. Readingsshould be taken at all incremental stages throughout the test cycles