2021 Volume 67 Issue 2 Pages 93-99
To evaluate the strength of structural members using a stress wave propagation method, it is necessary to determine a constant elastic modulus value, regardless of the sensor insertion position and distance between the sensors. Therefore, the elastic modulus values of sugi (Cryptomeria japonica), hinoki (Chamaecyparis obtusa), akamatsu (Pinus densiflora), and karamatsu (Larix kaempferi), which have been used for wooden civil engineering structures, were evaluated while varying the sensor insertion position and the distance between sensors. The elastic modulus was found to be larger when the sensor was inserted between the structural member cross sections, rather than between the surfaces. Moreover, a positive correlation between elastic modulus and distance between sensors was discovered. Subsequently, a correction formula was devised that ensures that the elastic modulus is constant, regardless of sensor insertion position and distance between sensors, with the correction formula calculated for each of the examined wood species.
