The Dynamic-Static Method (Dsm) for Structural Displacement Analysis Using the Example of a Wooden Church in Domachowo (Poland)

Abstract

Abstract. Medieval architecture in Poland is not widely represented in the tangible cultural heritage. A preserved structure with traces of medieval architecture is the parish church in Domachowo in southern Greater Poland (Wielkopolska). Due to numerous alterations and modernisations, it is now a complex structure showing clear signs of a damaged original geometry.For this reason, a project was initiated to measure the stability of the structure, especially under the influence of extreme external factors: mainly gusts of wind and uneven sun illumination. The implementation of the project required using two methods of measurement: static, at fixed time intervals, and dynamic, recorded on an ongoing basis during the operation of variable loads. The outcomes consisting of a combination of both methods and the unconventional use of precise inclinometers for measuring wooden structures, opens up new possibilities for real-time analysis of structural deformations and ongoing monitoring of technical conditions.The subject of this paper is to present the methodology of the conducted static-dynamic measurements (DSM) and the interpretation of their results, mainly in the context of assessing accuracy, stability of long-term readings with inertial sensors, and basic structural assessment.

Two Complementary Approaches toward Geodetic Monitoring of a Historic Wooden Church to Inspect Its Static and Dynamic Behavior

“…The first approach was discussed in a paper at the FIG Congress in Warsaw [18], indicating that, thanks to the second-degree correction, it is possible to "zero" the readings in a quiet time. It was also found that, for the description of the examined phenomenon of forced vibrations, the absolute values of the indications are not important, but their variability, as a result of the impulse pressure of external forces, is [21]. Taking into account the standard errors in the tachymetric measurement, it was initially assumed that the object at the level of the ceiling does not show unambiguous horizontal displacements relative to the floor.…”

“…The first approach was discussed in a paper at the FIG Congress in Warsaw [18], indicating that, thanks to the second-degree correction, it is possible to "zero" the readings in a quiet time. It was also found that, for the description of the examined phenomenon of forced vibrations, the absolute values of the indications are not important, but their variability, as a result of the impulse pressure of external forces, is [21].…”

“…The subject of this publication was the last of the mentioned groups of studies. The tests concern a specific object, but they can be universal for a given group of old wooden buildings, because they present developed approaches to the design, course, and evaluation of the results of combined geodetic measurements (tachymetry) and readings of inclination sensors, which were analyzed together with the obtained values of the selected weather parameters [18,21]. The approach presented here is utilitarian in nature, due to the physical subject and purpose of the research, but it can be a permanent element of monitoring complex structures.…”