Disclosed herewith a modular integrated building and a construction method thereof. The building comprises multiple prefabricated room units (1). A bottom of a load-bearing structure of the prefabricated room unit (1) is provided with a semi-prefabricated connecting port (2). Reinforcing bars arranged at a top of the prefabricated room unit (1) of a next floor are inserted in the connecting port (2) and thus connected with reinforcing bars arranged therein, so that the prefabricated room units (1) of two adjacent floors are connected with each other through in-situ casting concrete in the connecting port (2). A cast-in-situ concrete interlayer (3) is arranged on a top plate (11) of the prefabricated room unit (1) of a next floor, for connecting adjacent prefabricated room units (1) of a same floor together.

Precast construction elements are described suitable for use in high seismic areas. The precast construction elements can be precast, pre-topped double tees. The precast construction elements incorporate a passive energy dissipation device in a flange. The energy dissipation device provides a ductile connection having a deformation capacity of larger than 0.6″. Adjacent elements are connected to one another at joints that include the passive energy dissipation device. Passive energy dissipation devices can be passive hysteretic dampeners, such as U-shaped flexural plates. Passive energy dissipation devices can be bar dissipaters (e.g., grooved dissipaters). Also described are passive hysteretic dampers that include U-shaped flexural plates held in conjunction with a reinforcement element that defines a circle around which the flexural plate can bend.

The present invention relates to methods of forming voids in concrete elements, and to a void former apparatus and system useful for this application. The void former unit comprises a first void former element comprising a first surface and a first opening in the first surface and a second void former element comprising a second surface and a second opening in the second surface, wherein the first void former element and the second void former element detachably connect to form a passage between the first opening and the second opening, and a void space between the first surface and the second surface surrounding the passage. Multiple void former units can detachably connect to form a void former system comprising a single continuous void space. While exemplified by use in concrete elements, other uses of the void former unit and void former system are envisaged.

Precast construction elements are described suitable for use in high seismic areas. The precast construction elements can be precast, pre-topped double tees. The precast construction elements incorporate a passive energy dissipation device in a flange. The energy dissipation device provides a ductile connection having a deformation capacity of larger than 0.6″. Adjacent elements are connected to one another at joints that include the passive energy dissipation device. Passive energy dissipation devices can be passive hysteretic dampeners, such as U-shaped flexural plates. Passive energy dissipation devices can be bar dissipaters (e.g., grooved dissipaters). Also described are passive hysteretic dampers that include U-shaped flexural plates held in conjunction with a reinforcement element that defines a circle around which the flexural plate can bend.

The present invention is a modular structural building method consisting of prefabricated, precast, composite reinforced concrete raised floor and steel beam panels with adjustable levelling connection assemblies between panels, supported by columns. The system has the ability to accommodate the use of the floor by construction personnel during the on-site assembly process. The perimeter of the raised floor slab can be provided with ducts for a field installed conventional reinforcement means to create a continuous structural diaphragm for the floor panel.

Precast construction elements are described suitable for use in high seismic area. The precast construction elements can be precast, pre-topped double tees. The precast construction elements incorporate a passive energy dissipation device in a flange. The energy dissipation device provides a ductile connection having a deformation capacity of larger than 0.6″. Adjacent elements are connected to one another at joints that include the passive energy dissipation device. Passive energy dissipation devices can be passive hysteretic dampeners, such as U-shaped flexural plates. Passive energy dissipation devices can be bar dissipaters (e.g., grooved dissipaters). Also described are passive hysteretic dampers that include U-shaped flexural plates held in conjunction with a reinforcement element that defines a circle around which the flexural plate can bend.

The present invention relates to methods of forming voids in concrete elements, and to a void former apparatus and system useful for this application. The void former unit comprises a first void former element comprising a first surface and a first opening in the first surface and a second void former element comprising a second surface and a second opening in the second surface, wherein the first void former element and the second void former element detachably connect to form a passage between the first opening and the second opening, and a void space between the first surface and the second surface surrounding the passage. Multiple void former units can detachably connect to form a void former system comprising a single continuous void space. While exemplified by use in concrete elements, other uses of the void former unit and void former system are envisaged.

A connection assembly includes a first concrete member, a second concrete member, and a cap formed of a concrete material. The first concrete member has an end surface and a plurality of reinforcing bars protruding from the end surface. The second concrete member has a plurality of opening walls defining an opening extending through the second concrete member. The second concrete member is disposed on the end surface of the first concrete member with the reinforcing bars disposed in the opening. The cap is cast in the opening around the reinforcing bars and is spaced apart from each of the opening walls.

A concrete structure body includes a first concrete member having a first facing surface; a second concrete member having a second facing surface and disposed such that the first facing surface and the second facing surface face each other; a connection portion that fills a gap between the first facing surface and the second facing surface; and a tendon disposed in the connection portion to extend along the first facing surface and the second facing surface and to which a tensile force is applied in a longitudinal direction.

A connection assembly includes a first concrete member, a second concrete member, and a cap formed of a concrete material. The first concrete member has an end surface and a plurality of reinforcing bars protruding from the end surface. The second concrete member has a plurality of opening walls defining an opening extending through the second concrete member. The second concrete member is disposed on the end surface of the first concrete member with the reinforcing bars disposed in the opening. The cap is cast in the opening around the reinforcing bars and is spaced apart from each of the opening walls.