By The Institution of Structural Engineers
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Extra info for Appraisal of existing structures
Similarly, structural safety cannot be prescribed in absolute terms, but is certainly less subjective than serviceability. Deflection calculations are notoriously unreliable. Calculating deflections and comparing these with code recommendations is rarely of much value when appraising an existing structure. Therefore in the situations where there is no proposed change of use and no identifiable significant deterioration of the structure, the performance to date provides a better yardstick for serviceability performance.
There is no requirement to assess latent problems or related issues (such as discovering whether high alumina cement was used in construction or whether the structure contains significant levels of chlorides). There may be need for testing where one or more of the following concerns exist: ––There is a lack of information on the nature and properties of the materials in the structure. ––The presence of deteriorated or deleterious materials is known or suspected. ––The brief requires a prognosis of the future life of the structure.
63 Building Research Establishment. Wet rot: recognition and control. BRE Digest 345. 64 Building Research Establishment. Dry rot: its recognition and control. BRE Digest 299. 65 IStructE. Design and construction of deep basements including cut-and-cover structures. G. J. eds. The Weathering and performance of building materials. 2 Basic questions As mentioned in the Introduction, structural appraisal is an activity quite different from design. It is aimed at assessing the real condition and the adequacy of an existing structure.