SENSITIVITY ANALYSIS IN THE REHABILITATION OF HISTORIC TIMBER STRUCTURES ON THE EXAMPLES OF GREEK CATHOLIC CHURCHES IN POLISH SUBCARPATHIA
2021
This work concerns structural and sensitivity analysis of carpentry joints used in
historic wooden buildings in south-eastern Poland and western Ukraine. These are primarily
sacred buildings and the types of joints characteristic for this region are saddle notch and
dovetail joints. Thus, in the study the authors focus on these types of corner log joints.
Numerical models of the joints are defined and finite element simulations of their statics are
carried out. Moreover, a sensitivity analysis is performed in order to describe how the
uncertainty of material properties including humidity of some structural members, caused
during potential repairs, affect the structural behaviour of the whole connection. This
represents the situation when some degraded logs are exchanged into new wood combining
old, and often damp, wood with new and dry logs. A non-intrusive probabilistic approach to
the sensitivity analysis is applied and regression-based Polynomial Chaos (PC) expansion
method is used to propagate uncertainties.
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