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- W2563265410 abstract "Important information for the risk assessment of some damages on the historical structures represents data of failure development. Cracks in the load-bearing walls are one of the observed failures. This article focuses on remarkable method of damage measurement, their long-term monitoring and devices used for measurement. Long-term monitoring of crack movement in load-bearing walls and arches is one of the methods for a diagnosis of historical structures. Decision about reconstruction or structural adjustment of walls, ceilings or even bases is based on the results from the monitoring of the damage development. Changes that have to be monitored are very slow and relatively small. So that the long-term crack monitoring and data recording is necessary for determination of the crack development. The automatic measurement by the linear variable differential transformer has emerged as the most suitable method. High resolution, accuracy and measurement stability are the most important advantages of the method. The sensors requirements such as operation difficulty and price come from the fact that the measurement often goes on while the historical structure is in common use, e.g. sightseeing tours, cultural actions or restoration works take place there. There are several examples of testing and evaluation of the measurement that have been made on the historical structures in the Czech Republic in last years in the paper. 2. Analysis of requirements and choice of the method A used device has to be able to measure the displacement in units of micrometers, because the change of the crack dimension in the walls is generally tens or hundreds of micrometers for a period of several months. Sensor has to be mechanically connectable to the measured structure in an easy way, so that the historical building is not damaged. It has to survive adverse effects of local climate such as wind or rain and also the presence of dust or vibration has to be taken into account. The measurements itself and data recording has to be in a motion unattended for a long time; potential power cuts can't stop them. Data have to be saved continuously throughout the monitoring of the structure without risk of loss. The monitoring device is placed on the historical building for a long time (up to several years), often in a hardly accessible location. In spite of that its price can't be extremely high. The chosen method can also allow measuring the temperature in an area of the crack, temperature outside and relative humidity of the air altogether because all the information is relevant while evaluating the damage development." @default.
- W2563265410 created "2017-01-06" @default.
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- W2563265410 date "2012-01-01" @default.
- W2563265410 modified "2023-09-23" @default.
- W2563265410 title "LONG-TERM MONITORING OF MECHANICAL DAMAGE ON THE HISTORICAL STRUCTURES" @default.
- W2563265410 hasPublicationYear "2012" @default.
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