Determination of physical and mechanical properties of fir and black pine used in historical wooden houses in Mudurnu region

In this study, physical and mechanical properties of black pine (Pinus nigra Arnold, subsp. pallasiana) and fir (Abies bornmülleriana Mattf.) wood species used in historical wooden houses in Mudurnu region in Bolu were compared with control samples. In results of applied physical testing, moisture and water absorption rate of control samples were found to be higher than the historical samples. In mechanical tests, as the physical properties control specimens have shown higher strength properties than historical samples. When compared black pine historical samples to control samples strength losing was determined 58% in flexural strength, 27% compressive strength, 49% tensile strength. In historical fir samples these percentages were determined as 18%, 15% and 21% respectively. The highest nail holding strength decrease of historical black pine and fir were determined as 79% and 61% in tangential direction. The average of screw holding strength decrease of historical black pine samples have determined as 32% when compared to control black pine samples. In radial direction and tangential of historical fir samples the average of screw holding strength decreases were determined as 37.5%. Contrary to these decreases, 10% increasing has been observed in cross-section of historical fir samples.