Evaluation of the Residual Performance of Partially Charred Components of Old Wooden Structure Ⅰ - Use of Ultrasonic Velocity and Testing of the Drilling Resistance -

Evaluation of the Residual Performance of Partially Charred Components of Old Wooden Structure Ⅰ - Use of Ultrasonic Velocity and Testing of the Drilling Resistance -

Residual performance of old architectural wood which has been damaged was measured using Nondestructive Evaluation(NDE). The wood Pole Tester was used to assess ultrasonic velocity inside wood and drill resistance was determinedusing an IML-resistograph. For ultrasonic measurements squared timber and circular timber’s measurements were separatelyconducted with 1,300 m/s as the standard ultrasonic velocity. The standard wood samples divided into two parts;a non-sound area (below the standard), and a sound area (above the standard). Furthermore, schematization of wood wascompared with results naked eye observation. The drilling resistance test was performed for both length and thicknessdirection in wood. The internal of the drilling was set at 30 cm (length direction), 5 cm (width direction) and 30cm(thickness direction). A non-sound area was defined as that 1) amplitude is below 20% and 2) carbonization and deteriorationare related.

Residual performance of old architectural wood which has been damaged was measured using Nondestructive Evaluation(NDE). The wood Pole Tester was used to assess ultrasonic velocity inside wood and drill resistance was determinedusing an IML-resistograph. For ultrasonic measurements squared timber and circular timber’s measurements were separatelyconducted with 1,300 m/s as the standard ultrasonic velocity. The standard wood samples divided into two parts;a non-sound area (below the standard), and a sound area (above the standard). Furthermore, schematization of wood wascompared with results naked eye observation. The drilling resistance test was performed for both length and thicknessdirection in wood. The internal of the drilling was set at 30 cm (length direction), 5 cm (width direction) and 30cm(thickness direction). A non-sound area was defined as that 1) amplitude is below 20% and 2) carbonization and deteriorationare related.