Mechanical fire resistance of internal load bearing walls under both-sides heating is important for the prevention of collapse of a dwelling in a fire. Feasibility of the 45 minutes mechanical fire resistance with Japanese traditional timber-frame soil internal wall is studied for this purpose. The tests were initiated with intermediate scale specimens for the examination of the charring and internal temperature field of the column and then loaded tests under both-sides exposure were conducted on two 1-story tall bare-timber wall specimens. The tests suggest significant influence of the mortises of columns for horizontal timber bars on the buckling of walls. The conventional predictive method of the mechanical fire resistance of bare timber walls is then modified for the tested configuration.%筆者らは、軸組木造土壁構法による準耐火構造の開発を目標としrnて、外壁、床組等について、載荷加熱時の荷重を建物の実態に即しrnた荷重とすれば、準耐火構造で必要な45分間の要求性能を満足しrn得ることを明らかにした。rn木質系準耐火建築物では間仕切壁のうち、防火区画や長期荷重をrn支持するものは準耐火構造とする必要があるが、住宅等、開放的なrn居室で構成される建築物では、防火区画とならない間仕切壁が多数rn存在する可能性がある。
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