Japanese castle is well known the Samurai class modern period one, which have the beautifulrncastle tower and high stone wall. Korean castle characteristic is the mountain castle for take refuge in, whichrnhave the vertical stone wall surrounding the mountain ridge. These castles have developed in 3-power periodrnand continued up to 18th century. The Chinese castle history was the history of city. Whole city was surroundedrnby castle wall which was made of brick and soil, in where there were their palace, office and publicrnhousing. Japanese modern time castle wall was built piling up the stone block without using the iron- bar orrncement. For the purpose of clarifying the traditional technique in wall, and applying to the restoration, thernstudy of wall stability has been continued. I would like to show you these studies and practical method usingrnthe force indication line method.
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