Three-dimensional lightweight steel framing system formed by bi-directional continuous double beams

A three-dimensional lightweight steel framing system comprising:

• continuous beams, a column (2), a wall body, a purlin (16), a lightweight composite floor system and a lateral resistant mechanism comprising a diagonal support (41) or a lateral resistant bracing (42), wherein the double continuous beam comprises two single continuous beams, the single continuous beams having identical or different section profiles the column sandwiched between the single continuous beams, the single continuous beams kept continuous at the intersection with the column;
• wherein the lightweight composite floor system (311) is a purlin (16), a lateral resistant bracing (42) and/or a cemented steel mesh ceiling (32), the lightweight composite floor system (311) further comprises a floor deck formed by a profiled steel sheet (52) connected to the purlin (16) by the floor connector (51) and is filled with concrete or cement mortar (601);
• the profiled steel sheet (52) is a corrugated profiled steel sheet or a folded profiled steel sheet, the profiled steel sheet (52) is with a 0.2-to-1.0-millimeter thickness and a 30-to-50-millimeter groove depth;
• the concrete or the cement mortar (601) is further installed with anti-cracking mesh or anti-cracking fiber (531);
• the depth of concrete or cement mortar (601) is less than 50 millimeters from the top of concrete or cement mortar (601) to the top of the profiled steel sheet (52);
• the floor connector 51) comprises a self-tapping screw (502), a sleeve (513) and/or a bearing gasket (514), the sleeve (513) is tightly attached to the self-tapping screw (502), the sleeve (513) is made of metal or plastic, at least one side of the sleeve (513) is expanded to form the bearing gasket (514);
• the purlin (16) is disposed at intervals of less than 180 centimeter;
• at least one pair of opposite corners of the lightweight composite floor system (311) are bounded by said lateral resistant bracing (42);
• said lateral resistant bracing (42) is formed by a strip steel, the strip steel is connected to the purlin (16) by the self-tapping screw (502);
• the cemented steel mesh ceiling (32) is connected to the purlin (16) by the self-tapping screw (502) and/or an air nail (515);
• the cemented steel mesh ceiling (32) comprises a first expanded ribbed steel mesh (54) covered with a cement mortar layer (61), and the cement mortar layer (61) is further reinforced with an anti-cracking mesh and/or an anti-cracking fiber (531).