Study On Variations Of Physical And Mechanical Properties Of Ancient Wood Structure In The Imperial Palace

ABSTRACT Wood species identification and study on variation of original density, air-dried density, oven-dried density, MOE, MOR along radial direction of ancient wood structure in the Imperial Palace were conducted in this paper. The results indicated:(1) Wood species used in the experiment were Larch wood and Pine wood (Soft Pines).(2) The change trend of wood density along radial direction for two species were same: mature wood >juvenile wood > overmature wood. The difference in three density between juvenile and mature Larch wood as well as between mature wood and overmature wood reached 0.01 level of significance.(3) The change trend of MOE along radial direction for Larch wood and Pine wood were respectively: mature wood >juvenile wood > overmature wood, juvenile wood>mature wood>overmature wood. The difference in MOE between mature and overmature Larch wood as well as between juvenile wood and overmature Pine wood, between mature and overmature Pine wood reached 0.01 level of significance.(4) The change trends of MOR along radial direction for two were same: mature wood >overmature wood >juvenile wood. The difference between juvenile and mature Larchwood as well as between juvenile and mature Pine wood, between mature and overmature Pine wood reached 0.01 level of significance.(5) There was a remarkable positive correlation between mechanical properties and air-dried density for two wood species.(6) The difference in MOE and MOR between Larch wood beam and pillar both reached 0.01 level of significance. The difference in MOE and MOR between Pine wood beam and Fang reached 0.01 and 0.05 level of significance respectively.(7) The mean values of five physical and mechanical properties of Larch wood tested in this experiment were all larger than those of Pine wood. Larch wood was used as beam and pillar; while Pine wood was usually used as Fang, beam and pillar.[Fig. 14, Tab.26, Ref.40, For.6 ]...