JPH0835355A - Artificial elasto-plastic hinge - Google Patents

Abstract

PURPOSE:To let both end sections of the beam of a structural have a damping function, and also guarantee a beam yield leading rupture mode at the time of severe earthquakes by fabricating both end sections of the beam of the structure into a comb shape each composed of round surfaces, meshing them with each other, and fastening them with a bolt at their centers. CONSTITUTION:Both end sections of the beam 1b of a structure are fabricated into a comb shape each composed of round surfaces so as to be meshed with each other, and they are fastened with a bolt 3 at the centers of their round shapes so as to be formed into an artificial elasto-plastic hinge 2. The elasto-plastic hinge 2 of a multi-plane joint style usually acts as one body with the beam 1b, it acts as a damping means because of the frictional resistance of the elasto-plastic hinge 2 at the time of a weak shock of earthquake or strong wind, and the elasto-plastic hinge 2 has plastic deformation caused, and guarantees a beam yield leading rupture mode at the time of severe earthquakes. When the section in a comb shape is tapered, the hinge can be acceptable even if fabrication is somewhat degraded in accuracy, besides, it is also acceptable that let the hinge have a trigger function by providing a shear pin for the joint section of the elasto-plastic hinge 2, or a rotary type oil damper, a rotary lead damper or a hinge damper may be employed in the joint section.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an artificial elasto-plastic hinge which is provided at both ends of a beam of a structure, and the ultimate collapse type of the structure is used as the collapse of the beam end to prevent the entire structure from collapsing.

[0002]

2. Description of the Related Art Various existing seismic isolation devices such as laminated rubber,
AMD (Active Mass Driver), AVS (Active Varia
ble Stiffness), etc., but in both cases it is necessary to consider the grounding space.

[0003]

As mentioned above, various seismic isolation devices such as laminated rubber and AMD (Active Mass Drive) are used.
r), AVS (Active Variable Stiffness), etc. have been put to practical use, but both require installation space,
It is a large-scale device. The current limit design (proof design)
In accordance with the design concept that "the ultimate collapse of the frame is the collapse of the beam ends to prevent the collapse of the entire structure", the structural design is performed at the material and material stages. It remains uncertain whether or not the expected collapse type can be formed due to the uncertainties and the complicated structure. In addition, the structure itself is significantly damaged when the collapse type is formed. The present invention provides an artificial elasto-plastic hinge that does not require any additional installation space and forms a reliable beam end collapsing mold.

[0004]

In an artificial elasto-plastic hinge that joins left and right members, the ends of the left and right members are processed into a comb shape having circular surfaces, which are meshed with each other to form a circular center portion. Fastened with bolts to form an artificial elastic-plastic hinge. In this artificial elasto-plastic hinge, the comb-shaped circular surface can be tapered in the longitudinal direction of the member to improve the meshing.

It is also possible to provide shear pins in the comb-shaped circular surface.

In another artificial elasto-plastic hinge for joining left and right members to each other, the ends of the left and right members are processed into a comb shape having circular surfaces, and rotary oil dampers are inserted and meshed with each other. An artificial elastic-plastic hinge can be formed by fastening the central portion with a bolt.

Further, the ends of both the left and right members are processed into a comb shape having a circular surface, a cylindrical piston and a cylinder are inserted, a protrusion is provided on the cylinder wall, and the cylinder is filled with lead to make an artificial bullet. It is also possible to form a plastic hinge.

Further, in an artificial elasto-plastic hinge for joining both left and right members, a viscoelastic body sandwiched between plate members is arranged at the upper and lower abutting portions of the both members, and the both members are connected by a U-shaped metal member, It is also possible to connect the sides of both members with a backing plate member to form an artificial elastic-plastic hinge.

[0009]

By arranging the artificial elasto-plastic hinges 2 according to the present invention at both ends of the beam of the structure 1, the rigidity of the portion 2 of the elasto-plastic hinge is changed to prevent deformation and resonance of the structure, or It is possible to yield and absorb the vibration energy to suppress the shaking of the structure. The operation will be described with reference to the drawings. FIG.
(A) is a figure in which the elasto-plastic hinge 2 acts integrally with the beam in normal times. FIG. 1B is a diagram showing that the elasto-plastic hinge functions as a vibration control device due to frictional resistance during a medium earthquake or strong wind. FIG.1 (c) is a figure which shows that an elasto-plastic hinge causes plastic deformation at the time of a big earthquake, and guarantees a beam yield precedence failure mode.

[0010]

EXAMPLE FIG. 2 (a) is a side view of an elasto-plastic hinge 2a of the multi-face friction joining system of the present invention.

FIG. 2B is a sectional view thereof. This is 2
The end portions of the two members are processed into a comb shape, joined together by the bolts 3 in a state where they mesh with each other, and the vibration energy is absorbed by the friction of the joined end surfaces to form a clear hinge. For example, if the comb portion is provided with a taper, friction on the entire contact surface can be expected even if the processing accuracy is somewhat poor.

The features of the elasto-plastic hinge 2a are that the mechanism is simple, that it can be applied to various design levels by changing the number of friction surfaces, and that it can be applied to the automated assembly (robotization) of the frame. Is mentioned.

FIG. 3 (a) is a side view of an elasto-plastic hinge 2b of a multi-face friction joining type with a trigger function. FIG. 3 (b)
Is a sectional view. By inserting the shearing pin 4 into the elasto-plastic hinge 2a of the multi-sided friction joining method, the force acting on the elasto-plastic hinge 2b of the multi-sided friction joining method with a trigger function becomes a certain level or more, and the shear pin 4 is cut. Only after this, the vibration energy is absorbed by the friction of the joint end faces to form a clear hinge.

FIG. 4A is a side view of a rotary oil damper type elasto-plastic hinge 2c. FIG.4 (b) is sectional drawing. A rotary type oil damper 5 is used at the joining portion of two members, and damping of the oil is actively controlled by an orifice 6 to control damping, thereby forming a clear hinge. A feature of the rotary oil damper type elasto-plastic hinge 2c is that variable damping and variable rigidity can be realized in a limited space within the frame frame of the structure.

FIG. 5A is a side view of a rotary lead damper type elasto-plastic hinge 2d. FIG. 5B is a sectional view. The lead 8 pushed out to the rotary piston 10 of the right side member is plastically deformed by the protrusion 9 of the left side member to absorb the rotational energy of the member and form a clear hinge.

FIG. 6A is a side view of an elasto-plastic hinge 2e of an elasto-plastic hinge damper type. The viscoelastic body sandwiched between the plate members 12 is arranged at the upper and lower contact portions of the right member and the left member, and the right member and the left member are connected by the U-shaped metal piece 13, and the side portions of the right member and the left member are contact plates. The members 14 are connected. The elastic-plastic hinge damper type elastic-plastic hinge 2e absorbs vibration energy by shear deformation of the viscoelastic body 11 during small deformation, and absorbs energy by plastic deformation of the U-shaped metal object during large deformation.

[0017]

The effects of the present invention are as follows.

(A) In normal times, the elasto-plastic hinge acts as an integral part of the beam, and no special space is required to install the elasto-plastic hinge.

(B) During a medium earthquake or strong wind, the elasto-plastic hinge functions as a vibration control device due to frictional resistance.

(C) At the time of a large earthquake, the elasto-plastic hinge undergoes plastic deformation to guarantee the beam yield pre-failure mode.

[Brief description of drawings]

FIG. 1 (a) is a view showing a structure to which the present invention is applied, in which an elasto-plastic hinge acts as an integral part of a beam in a normal state. (B) It is a figure showing that an elasto-plastic hinge functions as a vibration control device due to frictional resistance during a medium earthquake or a strong wind. (C) During a large earthquake, the elasto-plastic hinge causes plastic deformation,
It is a figure which shows guaranteeing a beam yield precedence failure mode.

FIG. 2 (a) is a side view of the elasto-plastic hinge of the multi-face friction joining method of the present invention. (B) It is sectional drawing of (a). (C) It is a detailed view of part A.

FIG. 3 (a) is a side view of an elasto-plastic hinge of a multi-face friction joining type with a trigger function of the present invention. (B) It is sectional drawing of (a).

FIG. 4 (a) is a side view of a rotary oil damper type elasto-plastic hinge of the present invention. (B) It is sectional drawing of (a).

FIG. 5 (a) is a side view of the rotary lead damper type elasto-plastic hinge of the present invention. (B) It is sectional drawing of (a).

FIG. 6 is a side view of an elasto-plastic hinge damper type elasto-plastic hinge of the present invention.

[Explanation of symbols]

1 ... Structure, 1a ... Pillar, 1b ... Beam, 2 ...
-Artificial elasto-plastic hinge, 3 ... bolt, 4 ... shear pin, 5 ... rotary oil damper, 6 ... orifice, 7 ... oil, 8 ... lead, 9 ... Protrusions,
10 ... Piston, 11 ... Viscoelastic body, 12 ...
Plate member, 13 ... U-shaped metal member, 14 ... Pad plate member

Claims (6)

[Claims] 1. In an artificial elasto-plastic hinge for joining left and right members, the ends of the left and right members are processed into a comb shape having a circular surface, meshed with each other, and the circular center portions are fastened with bolts. An artificial elasto-plastic hinge characterized by 2. The artificial elastic-plastic hinge according to claim 1, wherein a comb-shaped circular surface is provided with a taper in a longitudinal direction of the member. 3. The artificial elastic-plastic hinge according to claim 1, wherein a shear pin is provided in the comb-shaped circular surface. 4. In an artificial elasto-plastic hinge for joining left and right members, the ends of the left and right members are processed into a comb shape having circular surfaces, and rotary oil dampers are inserted and meshed with each other. An artificial elasto-plastic hinge characterized in that its central portion is fastened with bolts. 5. An artificial elasto-plastic hinge for joining left and right members, wherein ends of the left and right members are processed into a comb shape having a circular surface, and a cylindrical piston and a cylinder are inserted, and a cylinder wall is inserted. An artificial elasto-plastic hinge characterized in that a protrusion is provided and the cylinder is filled with lead. 6. An artificial elasto-plastic hinge for joining left and right members, wherein viscoelastic bodies sandwiched by plate members are arranged at upper and lower abutting portions of the both members, and the U and metal members are connected to each other. The artificial elasto-plastic hinge, characterized in that the side portions of both members are connected by a backing plate member.