科研之友
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摘要
Many existing bridges have to be reassessed with respect to their actual bearing capacities and serviceability. They exhibit conceptual aging and thus require elaborate recalculation methods like the ones at stage two of the recalculation guideline. Often, calculative deficits are determined that contradict to the visible state of a building. Then, measurements at vulnerable structural elements become meaningful to identify actual reserves and thus elongate a residual lifetime. This complies with the third stage of the recalculation guideline - although hardly used in practice. Measurements make sense e. g. for fatigue damages of tendons or rebar as well as parameters of the serviceability state that pronouncedly depend on a realistic modelling of the structural behaviour and loadings. The contribution starts from the analytical methods, namely the numerical fatigue evaluation with its sensitive parameters and their particular influence. A variety of possible measurements for geometries, material properties, loadings, strain states or environmental conditions are briefly presented and summarised with their basic properties in a table to support the decision making of practical engineers. Two examples of geometry measures and strain measures at tendons coupled to additional data show the potential of monitoring for lifetime oriented preservations. Calculative lifetimes could be elongated up to a factor of 14.
- 出版日期2018-2
