MATERIAL PROPERTY EVALUATION OF COLUMNS IN TRADITIONAL WOODEN BUILDINGS USING IMPACT ELASTIC WAVE

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  • 衝撃弾性波を用いた伝統木造建物の柱の材料定数評価法の提案
  • ショウゲキ ダンセイハ オ モチイタ デントウ モクゾウ タテモノ ノ ハシラ ノ ザイリョウ テイスウ ヒョウカホウ ノ テイアン

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Abstract

<p> To mitigate seismic damages of traditional wooden buildings in Japan, it is important to evaluate aseismic performance of the traditional wooden buildings properly and conduct proper aseismic reinforcement. Major aseismic elements of many traditional wooden buildings are hanging walls. If strong ground motions occur, the columns next to the hanging walls may be broken and the buildings result in collapse. Therefore, it is important to evaluate whether the columns break or not using the material properties such as bending Young’s modulus and bending strength.</p><p> To evaluate the material properties of each column in the traditional wooden buildings, non-destructive tests are desirable because many buildings are regarded as cultural properties. In our previous study2), we have proposed a non-destructive test using impact elastic wave to measure wave velocity of wood. Moreover, we have found preferable correlation between the bending Young’s modulus and the dynamic modulus of elasticity which was calculated from the wave velocity and the density of the wood. Nevertheless, we did not propose a material property evaluation method to be used for the aseismic performance evaluation of traditional wooden buildings in our previous study. In this study, we propose the evaluation method of bending Young’s modulus and bending strength of columns.</p><p> On the other hand, there are cases where the columns and beams in the traditional wooden buildings are replaced totally or partially because of degradation. Therefore, in our propose method, we make small specimens from these replaced wooden members and conduct both impact elastic wave test and bending test to the small specimens. From these test results, we conduct regression analysis and construct the relation expressions of the material properties. Then, the material properties of the columns in the buildings are evaluated to apply the wave velocity of the columns to the relation expressions.</p><p> Our proposed method is summarized in three steps as follows.</p><p> A) Field tests to columns in the buildings</p><p> Impact elastic wave test to the columns in the building is conducted to obtain the wave velocity of the columns.</p><p> B) Laboratory tests to small specimens</p><p> Impact elastic wave test, bending test and density measurement are conducted to obtain the material properties.</p><p> Regression analysis are also conducted to construct the relation expression.</p><p> C) Evaluation of material properties of the columns</p><p> The material properties are evaluated using the wave velocity from A) and the material properties from B).</p><p> We will evaluate the material properties of the columns without laboratory tests to accumulate the relation expressions of the material properties of various kinds of tree species.</p>

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