Abstract:
PROBLEM TO BE SOLVED: To reduce the shear force caused by leverage of a steel construction part in a mixed structural beam comprising a concrete part and the steel construction part to reduce or eliminate reinforcements, thereby reducing the construction cost as well as enhancing the workability. SOLUTION: A cross-sectional cutout part 3 is provided by forming a slit 31 in a web 22 of a steel construction part 12 embedded in a concrete part 11 to reduce the shear force caused by leverage of the embedded steel construction part 12 so as to reduce the amount of bar arrangement in shear reinforcements in a junction, by which the filling property in the concrete of the junction can be enhanced. The cross-sectional cutout part 3 can be cut out nearly over the overall height of the web 22. COPYRIGHT: (C)2012,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To exhibit a base isolation function independently of axial force in the vertical direction so as to be applicable to any building independently of whether it is a high rise building or a low rise building.SOLUTION: In a base isolation structure for a floor slab 4, at least a foundation and a frame comprising a pillar 1 and a beam 2 constructed on the foundation in a building are turned into an earthquake resistant structure. A floor slab in the building is subjected to edge cutting from the earthquake resistant structure and is turned into a base isolation structure. A required clearance 5 is provided between the floor slab and the surrounding earthquake resistant structure in the horizontal direction. An elastic material 6 is provided in the clearance to maintain the edge cutting state. In the vertical direction, a slide material 3 is provided between a lower surface of the floor slab and an upper surface of the surrounding earthquake resistant structure to maintain the edge cutting state.
Abstract:
PROBLEM TO BE SOLVED: To improve safety of a junction of a PC structure member and a steel structure member and to suppress the generation of excessive deflection deformation and vibrations of the steel structure member.SOLUTION: A composite structural beam 1 constitutes a skeletal structure of a building comprising columns and beams, and PC structure members 2 at both ends and a steel structure member 3 at the center part are joined by tensioning force by a tension steel material and a mechanical joint. In the composite structural beam 1, a secondary tension steel material 5 is disposed through a column 4 to the PC structure members 2 so as to be joined with the column 4 at a column-beam joint part, and the column 4 is provided with a jaw 41 for receiving the PC structural member 2. A primary tension steel material 10 is disposed by an outer cable system to the lower surface of the steel structure material 3 and tensed and fixed to the PC structure members 2 at both ends, and even if the secondary tension steel material 5 is broken by excessive loads, since the joining force of the junction of the PC structure member 2 and the steel structure member is maintained by the primary tension steel material, the safety of the junction is maintained.
Abstract:
PROBLEM TO BE SOLVED: To provide a structure for reinforcing a bridge girder, in which a PC cable is simply anchored and fixed in a small cross section without the application of hole-in anchor work to an existing bridge girder.SOLUTION: A reinforcing cable 2 is provided in a tensioned state almost throughout a distance between supporting points of a bridge girder 1; a supporting material is provided in the center of the bridge girder 1 so as to support the PC cable 2; and the PC cable 2 has both ends provided with anchoring and fixing ends, so as to be fixedly anchored. At the anchoring and fixing ends, a reinforcing frame 4 is lined in an outer peripheral surface of a downside portion of the bridge girder 1 and made into a temporarily fixed state, a plurality of the PC cables 2 are disposed therein, and a filler 5 is injected and solidified to fixedly anchor the PC cables 2. Preferably, the lining of the reinforcing frame 4 is applied in accordance with a cross-sectional shape of the bridge girder. When the bridge girder 1 has an I-shaped cross section, the lining is applied up to a web 10, and a section between a flange and the web 10 is formed in a step-like shape. Thus, this step portion 15 acts like a shear cotter to prevent the reinforcing frame 4 from falling from the bridge girder 1, even if adhesion of the filler 5 is weakened due to aged deterioration.
Abstract:
PROBLEM TO BE SOLVED: To provide a reinforced concrete structure which eliminates a need for a support upon placing a precast concrete beam on a capital part and a need for a clearance for avoiding collision of a building which may be caused by an earthquake. SOLUTION: The reinforced concrete structure 1 includes columns 2 which are respectively provided with beam receiving cogs 3 formed on the capital parts and are erected at appropriate intervals, prestressed beams 4 arranged between the beam receiving cogs 3, precast concrete floor slabs 5 arranged on upper faces 15 of these beams in a tightly contacting manner, and cast-in-place concrete 7 placed on the upper surface of the precast concrete floor slabs 5 and joints 6 between the beams and the columns. A column-beam joint part 10 in each of a plurality of spans of the beams 4 is an elasticized column-beam joint 11. A joint reinforcing wire 20 without a prestressing force is arranged in the elasticized column-beam joint 11 from the end of one of the beams to the end of another beam through the joint 6 of the column. Isolating materials 18 are respectively arranged on the outer peripheries of lower end reinforcements 14 and upper end reinforcements 17 projecting from the beam 4 into the joint 6 of the column. COPYRIGHT: (C)2010,JPO&INPIT