Structural assessment and load test of a RC roof top

Structural assessment and load test of a RC roof top

RE conducted the Structural Assessment (including rebound hammer and Ferroscan) and the Load Carrying Capacity Test on the roof top of a 4-story hospital in the Ubonratchathani province, Thailand. The assessment was necessary as 4 more floors would be constructed on top of this RC roof slab. This building was built 20 years ago. As a result, the floor structural drawing and the design load were questionable. Thus, the test was used to create a new structural drawing of the floors and to determine the load capacity of the floors compared with the design live load following the Building Act.

In the process of structural assessment, the RE team of engineers collected floor material properties e.g. the compressive strength of concrete, the reinforcement layout and the diameters. These parameters would then be used in the structural modeling analysis.

The Load Test was then conducted to determine the load carrying capacity of the slab.  A test load of 1000 kg/sq.m. was applied over a span of 63 sq.m. A plastic water pond was used as the load application. 3 sets of dial gauges and digital displacement transducers to measure the deflection of the floor were set up. The temperature effect on the equipment and the supporting truss was also taken into account using the total station and the prism.

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