JPH0518977B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an architectural frame having a structure in which prestressing steel is arranged within a beam.

[Problem that the invention seeks to solve]

Modern buildings are becoming more and more OA and intelligent, and corporate needs for functionally comfortable buildings are becoming stronger, and as a result, structures with sufficient ceiling height and large spans are required. . However, on the other hand, there are restrictions on the height of buildings due to legal regulations such as restrictions on diagonal lines on roads and restrictions on shading, making it difficult to ensure sufficient structural beam formation. be.

In light of these circumstances, methods have begun to be adopted to accommodate large spans by arranging prestressing steel inside the beams, while at the same time reducing the beam cross-section.However, in conventional frames, the beam cross-section is uniform. Because it is
Securing piping space for the equipment that is essential for OA still requires some effort, and the highest point of the PC steel arrangement curve is placed near the columns, so a large suspension force effect cannot be obtained, and it is difficult to reduce the beam size. The reality is that there are limits. In other words, the suspension force effect of the prestressed steel materials arranged in a catenary line, that is, the effect of the prestress moment of the prestressed steel materials, is controlled by the magnitude of the abdominal pressure.
Since this abdominal pressure is determined by the curvature of the suspension line, the curvature becomes small with the conventional arrangement method, and a large suspension force effect cannot be expected.

This invention was based on the actual situation of frames in which conventional prestressing steel materials are arranged, and by placing the highest point of the prestressing steel material arrangement curve inside the beam, it is possible to increase the suspension force effect and at the same time secure piping space. That is.

[Means for solving problems]

In the present invention, by locating the highest point of the PC steel material arrangement curve on the inner beam part of the column, the curvature of the curve is increased and the suspension force effect is increased. make it smaller,
This area will be used as piping space. This makes it possible to simultaneously satisfy the contradictory conditions of building OA requirements and height constraints.

The beam size of one span is smaller at the center than at both ends.
At both ends, haunches of equal cross section are formed.

The highest point of the PC steel material is located in this haunch section,
In the column part, they are arranged in a catenary line through the centroid axis of the beam.

〔Example〕

The present invention will be explained below based on the drawings showing one embodiment.

Architectural frame A of the present invention is constructed by arranging prestressing steel members 2 in a catenary line inside a beam 1 whose central portion of one span has a smaller thickness than both end portions.

As a result of reducing the size of the central portion of the beam 1, haunches 1a having equal cross sections are formed at both ends.

Figure 1 shows an example in which the lower end side of the beam 1 is cut out, and the structure is such that a duct/piping space S for equipment shown by hatching in Figure 3 is housed at the base of the ceiling 3. It is. Figure 3 shows how it fits.

The PC steel material 2 is at its highest point B as shown in Figure 1.
is located within the section of the haunch 1a, and arranged in a catenary between the highest point B and the lowest point C. And pillar 4,
In the fourth section, the PC steel material 2 is passed through the centroid axis position D of the beam 1. Point E and point F are the inflection points of the PC steel material 2 arrangement curve. Therefore, during one span, the PC steel material 2 has an upward curvature (downward convexity) in the central part, that is, between C and E, and an upward curvature (downward convexity) in the section of the haunch 1a, that is, between E and E.
downward (convex upward) between F, 4 pillars, i.e. F
Horizontal or upward curve (convex downward) between ~D
It will be placed in Note that the highest point B may be located on the point E, that is, at the beginning of the corbel 1a.

The embodiment shown in FIG. 2 has a structure in which the upper end side of the beam 1 is cut out and the duct/piping space S is housed under the floor 5.

In this case as well, the PC steel materials 2 are arranged along a trajectory similar to the arrangement curve shown in FIG.

Figure 4 shows the duct/piping space S of this example.
This shows the state of affairs.

〔Effect of the invention〕

This invention has the above configuration, and the highest point of the PC steel arrangement curve is located in the haunch section of the beam, so the distance between the highest points is shorter than when the highest point is located inside the column, and the suspension force effect is reduced. i.e. PC
The curve and radius of curvature of the steel material become smaller, and the upward action of supporting the central part of the beam, where the bending moment is large, becomes stronger, which in turn allows the beam span to be increased.
Therefore, since the beam size at the center of the beam can be made small, this space can be used as a space for equipment piping, and piping can be carried out without providing a beam through hole.

[Brief explanation of drawings]

Figures 1 and 2 are schematic diagrams showing embodiments of the present invention, particularly examples of the arrangement of prestressing steel materials. Figures 3 and 4 are examples of how the duct and piping spaces fit in Figures 1 and 2, respectively. FIG. A... Architectural frame, 1... Beam, 1a... Haunch,
2...PC steel material, 3...Ceiling, 4...Column, 5...
Floor, S...Duct/piping space.

Claims (1)

[Claims] 1. In an architectural structure in which prestressed steel (PC) steel is arranged in a catenary shape inside a reinforced concrete beam, the beam at the center of one span is made smaller than both ends to form haunches with equal cross-sections at both ends. The highest point of the placement curve is located in the haunch section, and the PC is placed in the column part.
An architectural frame characterized by a steel material passing through the centroid axis of a beam.