Method for jointing concrete column and iron beam
AssigneeKurosawa Construction Co., Ltd.
InventorsRyohei Kurosawa, Shigeru Hyakutake, Hitoyuki Takagi
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Abstract
A method is provided for jointing a concrete column and an iron beam. A structure joint portion is provided between a column-beam junction and an end of the iron beam, which is mourned on a coning provided to the column. Prestressing tendons are arranged in plural rows to horizontally penetrate the column-beam junction, Tension-introduction forces are applied to the prestressing tendons to tensionally anchor an anchor plate, and thereby to integrally joint the column and the beam.
Claims2
A method for jointing a concrete column and a iron beam in a building structure having the column and the beam, the beam being an iron beam formed of H-steel, the method comprising:
- forming a column-beam junction integrally to the column in advance;
- providing an anchor plate and an anchorage at an end of the beam,
- providing an end plate at an end of the beam and an anchor plate and an anchorage at a predetermined distance apart from the end of the beam, or
- providing an end plate, a solidified filler material with a predetermined thickness, and an anchorage at an end of the beam;
- providing a structure joint portion between the column-beam junction and the end of the beam;
- mounting the end of the beam on a cogging provided to the column;
- arranging prestressing tendons in plural rows to horizontally penetrate the column-beam junction;
- applying tension-introduction forces into the prestressing tendons to tensionally anchor the anchorage, and thereby to integrally joint the column and the beam;
- and
- providing a concrete slab with a predetermined thickness on an upper end of the beam, wherein
- the tension-introduction forces applied into the prestressing tendons are determined so as to fulfill the following conditions:
- joint separation at the structure joint portion is inhibited in a case of a moderate earthquake, which is a rare earthquake, or weaker;
- the joint separation is allowed to proceed in a case of a large earthquake, which is a very rare earthquake;
- and
- yielding of a lower flange of the iron beam is prevented in the case of the large earthquake, by fulfilling an expression:
- P<ds/dpc×Ts,
- where
- P denotes a resultant force P of the tension-introduction forces,
- ds denotes a distance between a lower end of the beam and a top end of the slab,
- dpc denotes a distance between a position where the resultant force affects and the top end of the slab,
- Ts denotes a tensile yield load of the lower flange of the iron beam and
- Ts=B×t×σy,
- B denotes a width of the lower flange,
- t denotes a plate thickness of the lower flange, and
- σy denotes a yielding strength of the iron beam.
A method for jointing a concrete column and a beam in a building structure having the column and the beam, the beam being an iron beam formed of H-steel, the method comprising:
- forming a column-beam junction integrally to the column in advance;
- providing an anchor plate and an anchorage at an end of the beam,
- providing an end plate at an end of the beam and an anchor plate and an anchorage at a predetermined distance apart from the end of the beam, or
- providing an end plate, a solidified filler material with a predetermined thickness, and an anchorage at an end of the beam;
- providing a structure joint portion between the column-beam junction and the end of the beam;
- mounting the end of the beam on a cogging provided to the column;
- arranging prestressing tendons in plural rows to horizontally penetrate the column-beam junction;
- applying tension-introduction forces into the prestressing tendons to tensionally anchor the anchorage, and thereby to integrally joint the column and the beam;
- and
- providing a concrete slab with a predetermined thickness on an upper end of the beam, wherein
- the tension-introduction forces applied into the prestressing tendons are determined so as to fulfill the following conditions:
- joint separation at the structure joint portion is inhibited in a case of a moderate earthquake, which is a rare earthquake, or weaker;
- the joint separation is allowed to proceed in a case of a large earthquake, which is a very rare earthquake;
- and
- yielding of a lower flange of the iron beam is prevented in the case of the large earthquake, by the tension-introduction force applied into the prestressing tendon in a lower-most row being the smallest, the tension-introduction force applied into the prestressing tendon in an upper-most row being the largest, and the tension-introduction force applied into the prestressing tendons increasing at each respective prestressing tendon between the lower-most row and the upper-most row.
Dependencies are inferred from the claim text.