NORMS FOR DESTRUCTIVE BENDING MOMENTS OF T-SHAPE CORNER JOINTS OF FRAME STRUCTURAL ELEMENTS MADE OF SOLID SPRUCE WOOD WITH A CROSS-SECTION OF 50 х 30 mm. (2026). Innovation in Woodworking Industry and Engineering Design, 8(2). http://innojs.ltu.bg/index.php/scjournal-inno/article/view/247