JPH04312682A - Vibration damper of steel framed construction - Google Patents

Abstract

PURPOSE:To facilitate a replacement of vibration damper members to maintain the effect of vibration damping by incorporating the unitized vibration damping members consisting of ultralow yielding point steel materials into a skeleton constituted of steel columns and beams. CONSTITUTION:Vibration damping members 3 of ultralow yielding point steel materials are incorporated into elements having high stress of members 4 and 5 of general steel materials in a rigid frame skeleton consisting of general steel columns 1 and beams 2. At that time, the vibration damping members 3 are unitized, rigid joints 6 with high strength bolts are provided between the members 4 and 5, and they are so mounted that they are capable of replacing. Plastic deformation is made in the vibration damping members 3 by stress caused in the time of repeated horizontal load such as wind, etc., so that energy such as wind, etc., is absorbed. According to the constitution, the vibration damping members 3 are so unitized that they are capable of replacing, and a fall in performance of the steel materials caused by fatigue and damage can be thereby prevented to maintain always the effect of vibration damping.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device for steel structures.

0002

[Prior Art] In Japanese Patent Application No. 2-307257, the present applicant has proposed a yield point strength σy of 2400 to 3300 kg/c.
Inside the frame made of general construction steel material of about m2,
By incorporating a member made of extremely low yield point steel material, which has a yield point strength of about 500 to 1500 kg/cm2, which is much lower than the above-mentioned general construction steel materials, it is possible to withstand earthquakes, wind, etc. We proposed a vibration damping structure that causes the same extremely low yield point steel to yield earlier than ordinary steel due to the stress generated during horizontal loading, and uses the hysteretic energy due to yielding of the same extremely low yield point steel as damping energy.

0003

[Problem to be solved by the invention] In the case of conventional structures, it is sufficient to ignore the influence of wind loads on horizontal loads and only consider seismic loads, but structures using ultra-low yield point steel materials In this case, as mentioned above, the yield point strength of the ultra-low yield point steel is much lower than that of ordinary steel, so the ultra-low yield point steel may be plastically deformed by a horizontal load similar to a wind load. Conceivable.

[0004] Wind loads do not act over a short period of time like earthquake loads, but act over a certain period of time, and at this time the building is subjected to repeated vibrations many times, resulting in an extremely low yield point. Fatigue damage to steel becomes a problem. The present invention was proposed in order to deal with such problems, and when fatigue damage of a vibration damping member made of extremely low yield point steel incorporated into a steel structure becomes a problem, the vibration damping member The object of the present invention is to provide a vibration damping device for a steel structure that allows replacement of the steel structure.

[0005]

[Means for Solving the Problems] In order to achieve the above object, a vibration damping device for a steel frame structure according to the present invention is provided within the frame plane of a steel frame structure composed of columns and beams made of general construction steel. It is constructed from an extremely low yield point steel material that has a much lower yield point strength than the above-mentioned general steel material, and is constructed by attaching a vibration damping member that is made into a unit so as to be replaceable.

[0006]

[Operation] Since the present invention is constructed as described above,
Due to the stress generated in a steel structure during horizontal loading, vibration damping members made of extremely low yield point steel, which has a much lower yield point strength than general construction steel installed within the structure of the steel structure, are Absorbs earthquake and wind energy by causing plastic deformation. Since the vibration damping member is made into a replaceable unit, the structure is subject to repeated horizontal loads over a certain period of time, such as wind loads, and fatigue damage to the vibration damping member becomes a problem. In such a case, by replacing the unitized damping member, the reduction in performance of the steel material due to fatigue damage can be eliminated and the same damping effect can always be exhibited.

[0007]

[Embodiment] Fig. 1 shows a first embodiment of the present invention, in which the yield point strength of Strength σy=500~1500kg/
The vibration damping member 3 made of ultra-low yield steel material, which has a yield point of about cm2, which is much lower than general steel materials, is installed in areas with large stress.
It is assembled into members 4 and 5 made of general steel,
The damping member 3 is formed into a unit, and a rigid joint 6 made of high-strength bolts is provided between the members 4 and 5 made of general steel so that it can be replaced.

Since the illustrated embodiment is constructed as described above, the vibration damping member 3 made of the low yield point steel undergoes plastic deformation due to stress generated during horizontal loads such as earthquakes and wind, so that earthquakes, Absorbs wind energy and exerts a vibration damping effect. When fatigue damage to the vibration damping member 3 made of the low yield point steel material becomes a problem, the vibration damping member 3 made into a unit is removed and replaced.

FIGS. 2 and 3 show the second and third embodiments of the present invention, respectively.
An example is shown in which the general steel member 5 in the example shown in FIG. The connection with the vibration damping member 3 is configured as a rigid joint 6 using high-strength bolts so that the ultra-low yield point steel member 3 can be replaced.

FIGS. 4 and 5 show the fourth and fifth embodiments of the present invention, respectively.
This embodiment shows a case in which a pin joint 7 is used as a joint between a vibration damping member 3 made of a unitized extremely low yield point steel material and a general steel material 4.

[0011]

Effects of the Invention According to the present invention, as described above, in the frame plane of a steel frame structure composed of columns and beams made of general construction steel, an extremely low In a vibration damping structure that incorporates a damping member made of yield point steel, the damping member is made into a unit so that the extremely low yield point steel material undergoes plastic deformation due to repeated loads such as wind loads. In cases where fatigue damage becomes a problem due to repeated exposure, by making parts of the vibration damping member made of ultra-low yield point steel replaceable, it is possible to eliminate deterioration in the performance of the steel material due to fatigue damage, and to always maintain the same damping material. It can be effective.

[0012] In addition, by using high-strength bolted joints and the like for easy replacement, and by replacing only the damping member unit made of ultra-low yield point steel before fatigue damage becomes a problem, It becomes possible to easily maintain the vibration damping effect without having any effect on the building itself.

[Brief explanation of drawings]

FIG. 1 is a front view showing a first embodiment of a vibration damping device for a steel structure according to the present invention.

FIG. 2 is a front view showing a second embodiment of the invention.

FIG. 3 is a front view showing a third embodiment of the present invention.

FIG. 4 is a front view showing a fourth embodiment of the present invention.

FIG. 5 is a front view showing a fifth embodiment of the present invention.

[Explanation of symbols]

1 Pillar 2 Beam 3. Vibration damping member 4. Components made of general steel materials 5. Components made of general steel materials 6 Rigid joint 7 Pin joint

Claims (1)

[Claims] Claim 1: A steel frame structure consisting of columns and beams made of general construction steel is made of extremely low yield point steel, which has a yield point strength far lower than that of the general steel, and is replaceable. A vibration damping device for a steel structure, characterized in that it is equipped with a vibration damping member unitized as described above.