A method of determining the unmodified temperature, T1, for elimination of thermal strain from the load testing is presented. It is based on the fact that the intersection point of two T–ε lines for a test point shows zero stress (or strain) and coincides with the known zero stress at the neutral axis of the structure, if the test point is set at the axis. The abscissa of this intersection point indicates the unmodified temperature T1. The method has been applied to the load test on a suspect beam in a 4‐storey building. The conclusion was reached that although the suspect beam was weaker than normal, it could take the assigned load without any remedial measures. This conclusion was verified by the practical evidence of normal service for more than five years.
The method is applicable to certain types of structures at the moment.
A new method of determining the thermal stress of concrete pavement in‐situ has been developed and applied to engineering practice with success. It consists of three parts:1. A system of theorems was established on the basis of mathematical modelisation that both temperature and thermal strain were sine functions of t, the time of observation, owing to the daily fluctuations of temperature and consequently the corresponding thermal strain. It was found that there exist a time phase and an angle of axes rotation between temperature and thermal strain.2. A bridge circuit with a strain block and specially designed equipment ‘free body’ was introduced. The strain transducer for every test point consists of one strain gauge in the strain block and one in the ‘free body’, the former is used as the active gauge in the bridge circuit and the latter as the dummy. A temperature probe of resistance type was inserted nearby each of the gauges. Arrangement of observations and procedure of the data treatment were stated.
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