Wooden load-bearing wall, method of constructing wooden load-bearing wall, method of increasing coefficient of effective wall length of wooden load-bearing wall, and gypsum-based load-bearing bearing board

A method of constructing a wooden load-bearing wall, comprising:

• fastening a gypsum-based load-bearing bearing board onto a wooden structure wall base of a wooden framework construction system or a wood framing construction system with fasteners,
• where the gypsum-based load-bearing bearing board includes a main material or a core material formed of a board-shaped hardened gypsum, and a paper member covering at least a front surface and a back surface of the main material or the core material,
• the gypsum-based load-bearing bearing board has, as an area density or a weight per unit area of the gypsum-based load-bearing bearing board determined as a mass per unit area of a wall surface of the wooden load-bearing wall, the area density or the weight per unit area in a range of from 6.5 kg/m2 to 8.9 kg/m2, a lateral nail resistance of 500 N or greater, and a compressive strength of 6.5 N/mm2 or greater, and
• each of the fasteners is a metal nail including a head portion and a body portion, in which an area ratio of an area of the head portion to a cross-sectional area of the body portion is set at a value in a range of from 6 to 13;
• and
• constructing the wooden load-bearing wall having, as an ultimate displacement of the wooden load-bearing wall determined by measuring a bearing wall test sample having a length of 1.82 m by an in-plane shear test, a value of the ultimate displacement (δu) being greater than 20×10−3 rad.

A method of increasing a coefficient of effective wall length of a wooden load-bearing wall that is constructed by fastening a gypsum-based load-bearing bearing board onto a wooden structure wall base of a wooden framework construction system or a wood framing construction system with fasteners, the method comprising:

• constructing the gypsum-based load-bearing bearing board using a main material or a core material formed of a board-shaped hardened gypsum, and a paper member covering at least a front surface and a back surface of the main material or the core material;
• setting a composition of the hardened gypsum of the main material or the core material so that an area density or a weight per unit area of the gypsum-based load-bearing bearing board determined as a mass per unit area of a wall surface is reduced to be in a range of from 6.5 kg/m2 to 8.9 kg/m2, and the gypsum-based load-bearing bearing board has a lateral nail resistance of 500 N or greater and a compressive strength of 6.5 N/mm2 or greater;
• using, as the fasteners, metal nails each including a head portion and a body portion, in which an area ratio of an area of the head portion to a cross-sectional area of the body portion is set at a value in a range of from 6 to 13, to inhibit a punching shear phenomenon or minimizing an action of a punch-out fracture;
• and
• constructing the wooden load-bearing wall having, as an ultimate displacement of the wooden load-bearing wall determined by measuring a bearing wall test sample having a length of 1.82 m by an in-plane shear test, a value of the ultimate displacement (δu) being greater than 20×10−3 rad.