Disclosed is a structural element including of interlocked resilient sheet material components, with each sheet operatively forming a component by being shaped to provide an elongate base with two opposing edges from which a first extension and a second extension respectively extend, with the second extension extending further from the base than the first extension, with the first and second extensions being provided with complimentary interlocking means operatively enabling the extensions of one sheet material component to be interlocked with the extensions of another sheet material component; with the extensions of four sheet components being interlocked, each at a right angle with at least one extension of another one of the sheet components, operatively for four sheet components to provide the structural element with an elongate open-ended core with a plurality of elongate open-ended ribs spaced around the core with each rib being longitudinally aligned with the core.

A building system may include at least one diaphragm beam having opposite ends connected to an external structural frame of a building, at least one pre-assembled floor-ceiling panel adjacent to a vertical side of and coupled to the diaphragm beam, and at least one pre-assembled wall adjacent to a horizontal side of and coupled to the diaphragm beam. The diaphragm beam may be filled with a mineral-based material, such as concrete. The one or more pre-assembled floor-ceiling panels may each include a plurality of joists extending perpendicular to the diaphragm beam, a floor-panel including at least one metal layer attached to the joists on a floor side of the pre-assembled floor-ceiling panel, and a ceiling panel including at least one layer comprising mineral-based material attached to the joists on a ceiling side of the pre-assembled floor-ceiling panel. The one or more pre-assembled walls may include interior and/or exterior walls of a building.

An assembled self-recovery circular concrete-filled steel-tube composite joint includes a circular steel-tube column and H-shaped steel beams, where steel bars penetrate through the circular steel-tube column; the circular steel-tube column includes an upper steel-tube column section, a central inserted-connection column section and a lower steel-tube column section; the upper steel-tube column section is connected to the central inserted-connection column section through an upper sleeve connector, and the central inserted-connection column section is connected to the lower steel-tube column section through a lower sleeve connector; and the H-shaped steel beams are connected to the circular steel-tube column through the upper sleeve connector and the lower sleeve connector. According to the assembled self-recovery circular concrete-filled steel-tube composite joint, all members are machined in a factory and are connected on site through bolts.

The present Stacked Wall Truss Construction and its use in multi-story buildings makes use of prefabricated modular wall elements (100) that are interconnected in three dimensions to enable the rapid completion of building construction with improved quality of construction over that found in traditional multi-story building construction. The resultant building is a structural steel frame without the use of stacking columns. Vierendeel trusses (100) with vertical members (101-105) of tube steel are used, thereby the construction process becomes stacking trusses fit up as complete walls, not erecting columns. An inner Mating Member (131-135) enables each truss to be near perfectly positioned on top of the installed truss below.

The present Stacked Wall Truss Construction and its use in multistory buildings makes use of prefabricated modular wall elements (100) that are interconnected in three dimensions to enable the rapid completion of building construction with improved quality of construction over that found in traditional multi-story building construction. The resultant building is a structural steel frame without the use of stacking columns. Vierendeel trusses (100) with vertical members (101-105) of tube steel are used, thereby the construction process becomes stacking trusses fit up as complete walls, not erecting columns. An inner Mating Member (131-135) enables each truss to be near perfectly positioned on top of the installed truss below.

The present Stacked Wall Truss Construction and its use in multi-story buildings makes use of prefabricated modular wall elements (100) that are interconnected in three dimensions to enable the rapid completion of building construction with improved quality of construction over that found in traditional multi-story building construction. The walls are created with stacking modular elements to form a vertically continuous structure, and Floor Modules (161,162) are supported by a Floor Shelf (141-144) at predetermined elevations to provide a solid surface on top of which a Topping Slab (1031,1032) of concrete is poured which fills the space between the Floor Module and the Wall Trusses to create an integral structure.

The present Stacked Wall Truss Construction and its use in multi-story buildings makes use of prefabricated modular wall elements (100) that are interconnected in three dimensions to enable the rapid completion of building construction with improved quality of construction over that found in traditional multi-story building construction. The walls are created with stacking modular elements to form a vertically continuous structure, and Floor Modules (161,162) are supported by a Floor Shelf (141-144) at predetermined elevations to provide a solid surface on top of which a Topping Slab (1031,1032) of concrete is poured which fills the space between the Floor Module and the Wall Trusses to create an integral structure.

An assembled self-recovery circular concrete-filled steel-tube composite joint includes a circular steel-tube column and H-shaped steel beams, where steel bars penetrate through the circular steel-tube column; the circular steel-tube column includes an upper steel-tube column section, a central inserted-connection column section and a lower steel-tube column section; the upper steel-tube column section is connected to the central inserted-connection column section through an upper sleeve connector, and the central inserted-connection column section is connected to the lower steel-tube column section through a lower sleeve connector; and the H-shaped steel beams are connected to the circular steel-tube column through the upper sleeve connector and the lower sleeve connector. According to the assembled self-recovery circular concrete-filled steel-tube composite joint, all members are machined in a factory and are connected on site through bolts.

An assemblable structural column joint connection using fiber-reinforced concrete filled round double steel tubes, including an outer high-strength round steel tube, an inner high-strength round steel tube and a round separation plate. The wedge-shaped teeth are provided at two sides of the outer and inner high-strength steel tubes, and wedge-shaped teeth spaced are uniformly distributed along circumferences of the inner and outer high-strength round steel tubes. The round separation plate includes a round plate provided with a central through-hole, and vertical separation walls are provided with on upper and lower surfaces of the round plate. The vertical separation walls are provided with wedge-shaped sliding grooves matching the wedge-shaped teeth. The inner and outer high-strength round steel tubes are fixedly connected to the round separation plate by matching the wedge-shaped teeth with the wedge-shaped sliding grooves.

The present application relates to the structure of a load-bearing column and a factory using the same. The load-bearing columns comprise a first column, a second column and a third column. The first column is a reinforced concrete column and is arranged on the underground floor. The second column is a pre-fabricated reinforced concrete column on the ground floor and is fixed to the top of the first column. The third column is fixed to the top of the second column, wherein the third column comprises a steel column and a third reinforcing bar assembly which surrounds the circumference of the steel column and extends from the bottom of the steel column in an axial direction to a predetermined distance.