JP2963344B2 - Unit frame of space truss and space truss frame - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a unit frame of a space truss in which a compression member is stabilized against buckling, and to a space truss frame constructed therefrom.

[0002]

2. Description of the Related Art It is possible to assemble a truss frame material of a flat truss in which an upper chord material and a lower chord material are connected by a web material such as a lattice material, or a tetrahedral truss unit. Conventionally, a space truss frame is composed of a single material such as a steel pipe or a shape steel.However, when a single material works as a compressed material, buckling becomes a problem before yield strength is achieved, and it cannot work to the full yield strength. The maximum strength is determined by the buckling load, and the maximum strength of the frame is also determined by the compression material.

[0003] Therefore, since the frame is composed of a single material, the components must be designed with a compressive force less than the buckling load of the compressive material. I can't. Further, after buckling, the proof strength is remarkably reduced and the deformability is also reduced, so that the energy absorbing ability for the vibration input to the frame cannot be expected.

The present invention has been made in view of the above background, and proposes a unit frame and an entire frame of a space truss which stabilizes a compression member against buckling and exerts a deformability.

[0005]

According to the present invention, a truss frame member, which is assembled by assembling four chord members into a diamond shape and laying a bundle in a short diagonal direction of the rhombus, is used as a basic component of the truss. As shown in FIG. 2, the tensile force T is applied to the bundle by the compressive force P acting between the nodes at both ends of the truss frame member, so that the string material, which bears the compressive force C, yields before the string buckles. Then, while the truss frame member of the basic component receives the compressive force P, it is caused to behave as a tensile member.

When the truss frame material acts as a compression member, the truss frame material can be yielded before the string material buckles. Therefore, the plastic deformation capability after yielding can be expected, and the truss frame material can withstand the vibration input to the frame. Energy absorption capacity is improved.

In a unit frame of a space truss, a plurality of truss frame members are arranged in a polygonal shape on a plane, the ends of adjacent truss frame members are connected to each other, and the truss frame members are restrained in a direction outside the plane by the truss frame members. Are connected.

Although the truss frame member is a plane truss, it tends to cause out-of-plane deformation with an increase in compressive force. However, restraint members for restraining out-of-plane deformation of the truss frame member at nodes at both ends of each truss frame member. Are connected to one another and the other ends are connected to each other while being connected to the other ends of the restraining members of the adjacent truss frame members, thereby forming a unit frame that is stable against out-of-plane deformation.

The unit frame constitutes a space truss frame by being incorporated in at least a part of the space of the space truss forming a continuous mesh of polygons on a plane.

[0010]

As shown in FIG. 1, a unit frame 5 according to the first aspect of the present invention has a flat truss frame 3 in which a bundle 2 is erected on a diamond-shaped frame composed of four chords 1 shown in FIG. At the same time, each truss frame 3
It is constructed by restraining the out-of-plane deformation of, and becomes a basic unit of the space truss frame.

FIG. 1 shows a case where the truss frame members 3 are combined in a triangular shape on a plane, but as shown in FIG. If the mesh can be continued in two directions, it can be combined with a pentagonal shape. Hexagons consist of a combination of triangles.

As shown in FIG. 2, the truss frame member 3 is provided between four chord members 1 arranged in a rhombus shape and nodes 7, 7 of the chord members 1, 1 in a short diagonal direction of the rhombus. It consists of bundle material 2,
In the long diagonal direction of the rhombus, the nodes 6 at both ends of the truss frame 3
The bundle 2 bears the tensile force T due to the compressive force P acting between the six. The joint between the chords 1 and 1 at the node 6 may be either a pin joint or a rigid joint.

FIG. 3 shows the relationship between the compressive force P acting on the truss frame member 3 and the compressive deformation δ of the chord member 1.
If the axis and the direction of action of the compressive force P coincide with each other, the buckling occurs, the proof stress rapidly decreases, the load bearing capacity is lost, and the energy absorbing capacity cannot be expected. It can be seen that since the frame member 3 is stable against buckling of the chord member 1, even after the bundling material 2 yields, it exhibits plastic deformation ability without reducing the proof stress and maintaining the proof stress at the time of yielding. Due to this plastic deformation capacity, the truss frame member 3 absorbs vibration energy input to the space truss frame when the compressive force P is applied.

As shown in FIGS. 1 and 6, a plurality of truss frame members 3 are assembled and arranged in a polygonal shape on a plane to form a unit frame 5.
Is configured. Adjoining truss frame members 3, 3
6 are connected to each other so as to overlap with each other,
The ends of the restraining members 4 and 4 are connected to the nodes 7 and 7 at both ends, respectively. Of the adjacent truss frame members 3, 3, the node 6 of one of the truss frame members 3 also serves as the node 6 of the adjacent truss frame member 3.

While the other ends of the restraining members 4 and 4 are connected to each other, they are connected to the other ends of the restraining members 4 and 4 of the adjacent truss frame members 3 to form nodes 8 of the restraining members 4 and 4. FIGS. 1 and 6 show two restraining members 4 and 4 connected to the bundle 2 of each truss frame member 3 connected to the center of a triangle formed by the unit frame 5 and connected to each other. 8 is arranged at the center of the unit frame 5. FIG. 8 shows that the other ends of the restraining members 4, 4 of the adjacent truss frame members 3, 3 are connected to each other, and the nodes 8 are arranged at three places in the triangle. Is the case.

The restraining member 4 is connected to the restraining members 4 of the adjacent truss frame members 3 and is installed on the truss frame member 3 on a plane so that the compressive force acts on the truss frame member 3. Out-of-plane deformation is constrained. The restraining member 4 is connected to the other restraining members 4 so that the truss frame 3
In order to bear the out-of-plane direction force, the connection state of both ends of the restraint member 4 may be either pin connection or rigid connection.

FIG. 4 shows a unit frame 5 in a case where the truss frame members 3 are combined in a rectangular shape on a plane. In this case as well, the other ends of the two restraining members 4, 4 connected to the respective truss frame members 3 can be connected to each other at the center of the square as in the case of the triangular shape. Connecting the restraining members 4 and 4 of the members 3 and 3 to each other,
Node 8 is located between them.

In the embodiment shown in FIGS. 1 and 4, the truss frame 3 is vertically oriented so that the lengths of the restraining members 4 and 4 connected to the bundle 2 of the truss frame 3 are equal. But
In some cases, it is inclined with respect to vertical.

In the space truss frame according to the second aspect of the present invention, as shown in FIGS.
The truss is configured to be incorporated in at least a part of an area of a space truss in which a polygon forms a continuous mesh. The space truss frame has a spherical or cylindrical curved surface as shown in Figs.
Alternatively, a curved surface having an upwardly convex curvature, such as an elliptical curved surface, is formed. 12 and 13 show the case where the unit frame 1 is used for the entire truss frame. FIG. 14 shows a state where the unit frame 1 of the embodiment shown in FIG. 1 is incorporated in a part of the entire truss frame.

FIG. 5 shows a continuous state of the unit frames 5 when the plane shape forms a triangular mesh, and FIGS. 6 and 8 show one unit frame 5 thereof. FIG. 7 is a view taken along line xx of FIG.

FIG. 9 shows a continuous state of the unit frame 5 when a square mesh is formed. 10 and 11 are views taken along arrows yy and zz, respectively, of FIG.

[0022]

The present invention is as described above. A truss frame member assembled by assembling four chords into a rhombus shape and laying a bundle in a short diagonal direction of the rhombus is used as a basic component of the truss. Since the tensile force is applied to the bundle by the compressive force acting between the nodes at both ends of the truss frame, the bundle can be tensile-yielded before the chord that bears the compressive force buckles. The frame material can behave as a tensile material while receiving a compressive force.

Further, one end of a restraining member for restraining the out-of-plane deformation of the truss frame material is connected to both ends of the bundle of each truss frame material, and the other ends are connected to each other to form adjacent truss frame materials. Is connected to the other end of the restraining member to form a unit frame, so that the truss frame member is stable against out-of-plane deformation.

Further, since the truss frame material can be yielded before the string material buckles, a plastic deformation ability after yielding can be expected, and an energy absorbing ability for vibration input to the frame can be enhanced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a unit frame in which truss frame members are assembled in a triangular shape.

FIG. 2 is an elevation view showing a truss frame member.

FIG. 3 is a diagram showing a load-deformation relationship between a truss frame member and a single member.

FIG. 4 is a perspective view showing a unit frame in which truss frame members are assembled in a square shape.

FIG. 5 is a plan view showing a space truss frame forming a triangular mesh.

FIG. 6 is a partially enlarged view of FIG. 5;

FIG. 7 is a view taken along line xx of FIG. 6;

FIG. 8 is a plan view showing a modification of FIG.

FIG. 9 is a plan view showing a space truss frame forming a square mesh.

FIG. 10 is a view taken along line yy of FIG. 10;

FIG. 11 is a view taken along line zz of FIG. 10;

FIG. 12 is a plan view showing a spherical space truss frame.

FIG. 13 is a plan view showing a tubular curved truss frame.

FIG. 14 is a plan view showing a space truss frame partially incorporating a unit frame.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... String material 2 ... Bundle material 3 ... Truss frame material 4 ... Constraint member 5 ... Unit frame 6 ... Node 7 ... Node 8
……node.

Claims (2)

(57) [Claims] 1. A truss frame composed of four chords assembled in a rhombus shape and a bundling material laid in a short diagonal direction of the rhombus. The ends of the adjacent truss frame members arranged in a shape are connected to each other, and one end of a restraining member for restraining the out-of-plane deformation of the truss frame member is connected to each of the nodes at both ends of the bundle member of each truss frame member, A unit frame for a space truss, wherein the other ends are connected to each other and the other end of the restraining member of each adjacent truss frame member. 2. A space truss frame which is constructed by incorporating the unit frame according to claim 1 in at least a part of a space of the space truss forming a continuous mesh of polygons on a plane.