Steel-framed concrete beam and method for constructing steel-framed concrete beam

Patent metadata

Field	Value
Publication number	US-10988928-B2
Application number	US-201916549198-A
Country	US
Kind code	B2
Filing date	Aug 23, 2019
Priority date	Feb 28, 2017
Publication date	Apr 27, 2021
Grant date	Apr 27, 2021

Abstract

A binding beam includes a steel form having a bottom plate portion and a pair of side plate portions extending upward from both ends of the bottom plate portion and binding beam concrete placed in a groove portion configured by the bottom plate portion and the pair of side plate portions of the steel form.

First claim

The invention claimed is:

1. A steel-framed concrete beam comprising:
a steel form having a bottom plate portion and a pair of side plate portions extending upward from both ends of the bottom plate portion; and
concrete placed in a groove portion configured by the bottom plate portion and the pair of side plate portions of the steel form,
wherein an allowable bending moment or an allowable shear force of the steel-framed concrete beam is calculated by Equation (1) below:
F a =F RC +β·F S   (Equation 1)

wherein,
F a : an allowable bending moment or an allowable shear force of the steel-framed concrete beam,
F RC : an allowable bending moment or an allowable shear force of the concrete,
β: a burden factor of an allowable bending moment or an allowable shear force of the steel form, which is 0.5 or less, and
F S : an allowable bending moment or an allowable shear force of the steel form.

2. The steel-framed concrete beam according to claim 1 , wherein
a part of the steel-framed concrete beam is joined to a girder, and
the steel form is provided with an end portion on the girder side in a longitudinal direction of the steel form, accommodated in the girder via a notch formed in a side surface of the girder, and having a length equal to or greater than a cover thickness of the girder.

3. The steel-framed concrete beam according to claim 1 , wherein the side plate portion and the concrete have a web opening forming portion allowing formation of a web opening penetrating the side plate portion and the concrete.

4. The steel-framed concrete beam according to claim 1 , wherein a non-opening member for fixing the pair of side plate portions to each other is provided in a range from an upper end position of the pair of side plate portions to a position below the upper end position by one-third of a height of the pair of side plate portions.

5. The steel-framed concrete beam according to claim 1 , wherein the steel form is provided with a flange portion extending outward from an upper end of the side plate portion.

6. The steel-framed concrete beam according to claim 5 , wherein the steel form is provided with a reinforcing portion extending downward or upward from an outer end of the flange portion.

7. A method for constructing a steel-framed concrete beam comprising:
a steel form installation comprising installing a steel form having a bottom plate portion and a pair of side plate portions extending upward from both ends of the bottom plate portion; and
a placement comprising placing concrete in a groove portion configured by the bottom plate portion and the pair of side plate portions of the steel form installed in the steel form installation,
wherein an allowable bending moment or an allowable shear force of the steel-framed concrete beam is calculated by Equation (1) below:
F a =F RC +β·F S   (Equation 1)

wherein,
F a : an allowable bending moment or an allowable shear force of the steel-framed concrete beam,
F RC : an allowable bending moment or an allowable shear force of the concrete,
β: a burden factor of an allowable bending moment or an allowable shear force of the steel form, which is 0.5 or less, and
F S : an allowable bending moment or an allowable shear force of the steel form.

8. The steel form according to claim 1 , wherein a joining surface of the bottom plate portion is formed by superposing a part of the bottom plate portion of a first of a pair of frame members of the steel form and a part of the bottom plate portion of a second of the pair of frame members over each other.

Assignees

• Takenaka Corp
• Jfe Steel Corp
• Jfe Metal Products Corp

Inventors

• Hirayama Takayuki
• Nakahira Kazuto
• Nozawa Hirokazu
• Okuno Yuuichirou
• Machinaga Takahiro
• Fujita Naohiro
• Takatsu Hiroto
• Yamazaki Kenji
• Murakami Yukio
• Kinoshita Tomohiro
• Shimizu Takanori
• Watanabe Seishi
• Yasuoka Hiroori

Classifications

• E04C3/293 Primary

  the materials being steel and concrete (concrete with internal reinforcements or tensioning members E04C3/20) · CPC title

• E04B5/40

  with metal form-slabs · CPC title

• E04B1/16

  Structures made from masses, e.g. of concrete, cast or similarly formed in situ with or without making use of additional elements, such as permanent forms, substructures to be coated with load-bearing material (E04B1/32 - E04B1/36 take precedence) · CPC title

• E04C3/294 Primary

  of concrete combined with a girder-like structure extending laterally outside the element (light weight girders used as reinforcement E04C5/065; as part of a floor structure E04B5/23) · CPC title