The invention provides a prefabricated structural element including an elongate body (11) and at least one first tensioner (1) that is fastened in the elongate body in such a manner that it compresses the elongate body. The structural element includes at least one second tensioner (2) that is fastened to the elongate body at two distinct points by two fastener element so that it compresses the elongate body, at least one of the fastener element being removable so as to make it possible to relax the compression exerted on the elongate body by the second tensioner.

There is provided a prefabricated floor panel (101) for use with a supporting structure (103) including a floor member (105) the floor member (105) defining a floor surface (107) and being adapted to engage with an adjacent similar floor panel (101) and at least one or more strengthening beams (109) configured to engage with the supporting structure (103) in use to support the prefabricated floor panel (101).

The precast reinforced concrete construction elements with pre-stressing connectors provide beam-column connections which are post-tensioned through a combination of active and passive pre-stressing tendons. The active pre-stressing tendons improve the efficiency and effectiveness of the beam-column connections under service loads, as well as during application of external forces and stresses, such as during earthquakes. The passive pre-stressing tendons are lightly pre-stressed and only become effective during progressive collapse of the building. Specifically, the passive pre-stressing tendons become stressed only during downward movement of a joint due to the loss/damage of a column, thus providing resistance against further downward movement of the joint and thereby resisting the progressive collapse.

This disclosure is directed to retention clamps that may be included in post-tensioning assemblies. More specifically, in some embodiments, a sheathing-retaining clamp for a post-tensioning assembly may comprise a body adjustable between an open position and a closed position, wherein in the closed position, the body is configured to wrap around a tendon assembly of the post-tensioning assembly, and a fastening mechanism configured to lock the body in the closed position. In some such embodiments, the sheathing-retaining clamp may additionally comprise a plurality of compression ribs that extend radially inwards from the body in the closed position and that are configured to directly contact a sleeve of the tendon assembly.

This disclosure is directed to retention clamps that may be included in post-tensioning assemblies. More specifically, in some embodiments, a sheathing-retaining clamp for a post-tensioning assembly may comprise a body adjustable between an open position and a closed position, wherein in the closed position, the body is configured to wrap around a tendon assembly of the post-tensioning assembly, and a fastening mechanism configured to lock the body in the closed position. In some such embodiments, the sheathing-retaining clamp may additionally comprise a plurality of compression ribs that extend radially inwards from the body in the closed position and that are configured to directly contact a sleeve of the tendon assembly.

There is provided a method of introducing prestress into a beam-column joint of PC construction to make it into a triaxially compressed state, in which the beam-column joint is made into a triaxial compression state and reasonable prestress is introduced into cross section areas of the ends of the members forming the beam-column joint. A tensile introducing force is generated by tensionally anchoring PC cables passed through the beam-column joint to introduce prestresses into the cross section areas of the ends of the members forming the beam-column joints in respective axial directions to make triaxial compression state, to satisfy the following conditions (1) and (2): (1) no tensile strength is generated, with respect to long term design load, in cross-section areas of the members forming the end of the beam and the end of the column, which ends are in contact with the beam-column joint; and (2) upon occurring of extremely large scale earthquake (very rarely occurred earthquake), in the beam-column joint, no generation of diagonal cracks is allowed to be generated but diagonal tensile stress intensity caused due to shear force inputted by seismic load is made less than allowable tensile stress intensity of concrete.

A pre-compression system for pre-compressing a concrete structure, the system comprising a first tubular element (31) that is expandable in a longitudinal direction and interposed between the first and the second head (21, 22). The first tubular element (31) is movable between a longitudinally elongated configuration, in which a pressurized fluid is placed inside the first tubular element (31), and a contracted configuration, in which said fluid is at least partly removed, the passage from the elongated configuration to the contracted configuration bringing about a compression on the concrete which at least partly envelops the first tubular element (31).

A pre-compression system for pre-compressing a concrete structure, the system comprising a first tubular element (31) that is expandable in a longitudinal direction and interposed between the first and the second head (21, 22). The first tubular element (31) is movable between a longitudinally elongated configuration, in which a pressurized fluid is placed inside the first tubular element (31), and a contracted configuration, in which said fluid is at least partly removed, the passage from the elongated configuration to the contracted configuration bringing about a compression on the concrete which at least partly envelops the first tubular element (31).

Provided are a hollow composite beam using a dual-web and a construction method thereof. The hollow composite beam using a dual-web can secure space efficiency using a tendon installed in an internal space of a dual-web and can efficiently adjust a tensioning force using the tendon anchored by an anchoring wedge and a separable bolt, wherein the dual-web is formed as a web of a steel beam having a bottom flange on which a deck plate is supported.

A method is defined for attaching mounted parts on a mounting substrate formed of concrete or masonry, having a group of anchors wherein the following is true for the ratio VSd/NSd of the rated value for the transverse load VSd and of the rated value of the tensile load NSd of at least one anchor in the anchor group: VSd/NSd≥0.3, preferably VSd/NSd≥0.6 and particularly preferably VSd/NSd≥1.0, and wherein the characteristic resistances of these anchors to transverse loading VRk or to tensile loading NRk satisfy the following relationship: VRk/NRk≤1.1. The at least one anchor of the anchor group is inclined at an angle αAnker to the perpendicular to the surface of the mounting substrate in such a manner that the following is true: αAnker=k*¾*arc tan (VSd/NSd) for NSd>0, and αAnker=k*67.5° for NSd=0, where: 0.8≤k≤1.34, providing that αAnker≤75°.