JPH0830191A - Device for experimenting member stress of truss - Google Patents

Abstract

PURPOSE:To easily and surely measure stresses acting on respective members constituting truss. CONSTITUTION:Both ends of the truss 3 assembled by force gage members 31 which are disposed in correspondence to the chord members or web members in the positions to be measured in stresses and have proving rings, general members 32 which are disposed in correspondence to the chord members or web members exclusive of the chord members or web members disposed with these force gage members 31 and cross beams 33 which freely turnably and pivotally support these force gage members 31 or the general members 32 are pivotally supported at the rotational bearing member 22 and mobile bearing member 23 of a base plate 2 and thereafter, a weight 34 is loaded at the arbitrary cross beam 33. The stresses acting on the force gage members 31 are measured via the strain gages stuck to the proving rings.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a truss member stress measuring device.

[0002]

2. Description of the Related Art Generally, truss type frame structures are generally known in various fields such as civil engineering, construction and machinery. This truss type frame structure (hereinafter referred to as truss) has a chord member, that is, a truss, as shown in FIGS.
An upper chord member U and a lower chord member L are connected by a belly member, that is, a diagonal member D and a vertical member V. Then, when considering the member strength of the truss, the upper chord member U constituting the truss,
It is necessary to calculate the stress acting on each member such as the lower chord L, the diagonal D, and the vertical V. In other words, it is necessary to know how much tensile force or compression force each member receives when an external force is applied to the truss.
Calculated by illustration and calculation.

On the other hand, the truss is learned in the middle and higher education curriculums, and the strength calculation is obtained by the above-mentioned illustrations and calculations, but the force is invisible, so that the learner must stress each member. It was difficult to understand intuitively. Therefore, as described in Japanese Utility Model Laid-Open No. 1-88974 and Japanese Utility Model Laid-Open No. 3-98475, an outer member, a rod made of an inner member slidably fitted to the outer member, and the rod. Forming a spring structure with a spring member disposed inside the material, assembling this spring structure as a chord member or a belly member that is each member of the truss, and then applying a load to such a truss Thus, a device has been proposed in which what kind of force and how much force acts on each member constituting the truss can be intuitively grasped by the amount of expansion and contraction of the spring structure and its direction.

[0004]

However, in the truss assembled by using the above-mentioned spring structure, the truss expands and contracts due to its own weight before the load is applied,
It had the drawback of giving a premonition. In this case, it is conceivable to increase the elastic coefficient of the spring member constituting the spring structure, but in that case, the amount of expansion and contraction of the spring structure becomes small, and it is extremely difficult to visually grasp the action state of force. Becomes

It is also possible to manufacture a scale model of a truss, attach a strain gauge directly to the member whose stress is to be measured, and apply a load to the truss to measure the stress, but this generally occurs in the elastic range. Strain is very small (1/10
Since it is necessary to use a measuring device with a very high magnification and a high precision, a relatively large model has to apply a considerably large load, and there is a drawback that the handling becomes complicated.

The present invention has been made in view of the above problems, and provides a member stress test device for a truss capable of simply and reliably measuring the stress acting on each member of the truss.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a base provided with a rotary bearing member and a movable bearing member, and both ends thereof are axially supported by the rotary bearing member and the movable bearing member of the base, respectively.
Corresponding to the chord member or the belly member arranged corresponding to the chord member or the belly member at the stress measurement target position, or the chord member or the chord member or the belly member excluding the chord member at the stress measurement target position where the force meter member is arranged And a truss assembled from transverse members that rotatably support these force gauge members or general members, wherein the force gauge member includes a proving ring, and It is characterized in that the stress acting on the dynamometer member can be measured through a strain gauge attached to the probing ring or through a dial gauge arranged in the probing ring by loading on the cross beam. It is a thing.

[0008]

[Operation] A force measuring member arranged on the rotary bearing member and the moving bearing member of the base in correspondence with the chord member or the abdominal member at the stress measuring position, and the stress measuring member having this force measuring member arranged. Of a truss assembled from general members arranged corresponding to the chord members or the belly members except the chord members or the belly members at the position, and a cross beam that rotatably supports these force meter members or the general members. After supporting both ends respectively, load them on any cross beam.

As a result, since the dynamometer member is provided with the proving ring, the stress acting on the dynamometer member can be measured as a large strain with a relatively small load,
Moreover, the member stress of the truss can be reliably measured via the strain gauge attached to the proving ring or via the dial gauge arranged on the proving ring.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a truss member stress measuring device 1 of the present invention. This truss member stress test device 1 is supported on a base 2 and on this base 2. It consists of a truss 3.

The base 2 is made of a channel material and can be adjusted horizontally as appropriate, and a rotary support member 22 fixed to the base frame 21 for rotatably supporting one end side of the truss 3. And a moving support member 23 that rotatably and rotatably supports the other end of the truss 3. As shown in detail in FIG. 3, the rotary support member 22 is spaced on the support plate 25 so that it can support both ends of the support plate 25 to which the cylindrical body 24 is fixed and the cross beam 33 that constitutes the truss 3. It is composed of a bracket 26 fixed in place, and a small hole 26a into which the bearing 10 that rotatably supports the horizontal girder 33 can be fitted is formed in the bracket 26. The cylindrical body 24 of the rotary support member 22 has a bush 2 fixed to the base frame 21 via a mounting plate 27.
8 is rotatably fitted.

The moving support member 23, like the rotary support member 22, is also composed of a support plate 25 having a cylindrical body 24 and a bracket 26 provided with a bearing 10 for rotatably supporting a cross beam 33. ing. However, in the bracket 26 of the moving support member 23, the long hole 26 is provided along the longitudinal direction of the truss 2 so that the bearing 10 supporting the horizontal girder 33 can roll.
b is formed (see FIG. 5).

The distance between the rotary support member 22 and the movable support member 23 with respect to the base frame 21 of the base 2 is fixed according to the span of the truss 3 to be assembled. The support member of 1 may be slidably provided on the base frame 21.

On the other hand, the truss 3 has a lower chord member L as a chord member.
Of the upper chord member U and the diagonal member D serving as a belly member, a force meter member 31 disposed corresponding to any lower chord member L, diagonal member D, and upper chord member U whose member stress is to be measured. Dynamometer member 31
Lower chord member L, diagonal member D, lower chord member L excluding upper chord member U, diagonal member D, plate-shaped general member 32 arranged corresponding to the upper chord member U, and a force meter member thereof. 31 and general member 32
Of the horizontal girder 33 and the weight 34 as a load that can be loaded on the lateral girder 33. The horizontal girder 33 is provided at both ends of the force meter member 31 and the general member 32. The bearing 10 is fitted so that the force meter member 31 and the general member 32 are rotatably supported.

Specifically, the truss 3 includes lower chord members L _{1 to} L ₄ , diagonal members D _{1 to} D ₈ and upper chord members U _{1 to} U ₃ having the same length.
Of the chord member or the belly member, the force meter member 31 is disposed on the diagonal member D ₄ and the upper chord member U ₂ whose member stress is to be measured.
1, the diagonal members D _{1 to} D ₃ , D _{5 to} D ₈ other than the diagonal member D ₄ and the upper chord member U ₂ are applied to the upper chord members U ₁ and U ₃ and the lower chord members L _{1 to} L ₄ . A general member 32 having the same length as the measuring member 31 is arranged. And these lower chord members L ₁
˜L ₄ , diagonal members D _{1 to} D ₈ and upper chord members U _{1 to} U ₃ , the transverse girder 33 is applied to the point, which is the overlapping portion of the force gauge member 31 and the general member 32, Further, a weight 34 is loaded on the horizontal girder 33 which is bridged over the grade.

In this case, since the truss 3 is treated as a plane truss, the force gauge member 31 is arranged in one plane.

By the way, as shown in FIGS. 6 and 7, the force meter member 31 includes a proving ring 36 having a joint 35, and a plate-like connecting member 37 detachably connected to the joint 35 of the proving ring 36. The large strain can be measured with a relatively small load. The strain generated by the load acting on the force meter member 31 can be measured by the strain gauge 11 attached to the central portion of the probing ring 36, and the measurement result is not shown in detail, but the strain gauge is used. Can be displayed on.

In this embodiment, a strain gauge is attached to the proving ring 36 to detect the stress acting on the force gauge member 31, but a dial gauge is arranged on the proving ring 36 to determine the diameter of the proving ring 36. You may make it grasp from the amount of change.

A plurality of types of connecting members 36 and general members 32 of the force meter member 31 having different lengths are prepared, and by selecting the connecting members 36 and general members 32 having the required lengths, In addition to the warren truss shown in FIG. 1 and FIG. 8, a how truss (see FIG. 9), a platform truss, a roof truss, etc. can be assembled.

Next, the case of measuring the member stress of the truss 3 will be described. First, each pair of lower chord members L _{1 to} L ₄ , diagonal members D _{1 to} D ₈ and upper chord members U ₁ to. U ₃
Corresponding to the force meter member 31 and the general member 32,
A cross beam 33 is prepared, and the bearings 1 are respectively attached to both ends of the cross beam 33.
The force meter member 31 and the general member 32 fitted with 0 are fitted, and the force meter member 31 and the general members corresponding to the lower chord members L _{1 to} L ₄ , the diagonal members D _{1 to} D ₈ and the upper chord members U _{1 to} U ₃ are inserted. Fasten with the nut 12 (see FIG. 3) so that the member 32 does not come off. In this case, the diagonal member D whose member stress is to be measured
₄ and the upper chord member U ₂ are provided with a force meter member 31, and the other lower chord member L, diagonal member D and upper chord member U are provided with a general member 32.
Is arranged. In addition, depending on the grade, the number of superposed general members 32 including the force measuring member 31 changes, so that the spacer 13 having the same plate thickness as the connecting member 37 of the force measuring member 31 and the general member 32 is disposed. It is necessary to adjust so that the measuring member 31 and the general member 32 are not twisted.

When the truss 3 is assembled in this manner, the superposed portions of the general members 31 (lower chord member L ₁ and diagonal member D ₁ and lower chord member L ₄ and diagonal member D ₈ ) located at both ends thereof are rotationally supported. The member 21 and the moving support member 22 are fitted into both ends of the cross girder 33 arranged on the bracket 26, and fastened with the nut 12 so as not to separate. After this, the horizontal girder 33 located at the grade
When the weight 34 is loaded on the stress gauge 11, the stress acting on the force gauge member 31 arranged corresponding to the diagonal member D ₄ and the upper chord member U ₂ by the load is caused by the strain gauge 11 attached to the proving ring 36. It is converted into an electric signal and displayed on a strain gauge (not shown).

In this case, the diagonal member D ₄ and the upper chord member U ₂ are selected as the members at the position to be measured, but the lower chord member L, the diagonal member D or the upper chord member U other than these may be used. For example, the truss 3 may be assembled by disposing the force gauge members 31 corresponding to all the lower chord members L _{1 to} L ₄ , the diagonal members D _{1 to} D ₈ and the upper chord members U _{1 to} U _3. The force meter member 3 corresponding to any one selected from L, diagonal member D, or upper chord member U
1 may be provided. Further, the loading position of the weight 34 may be a rating other than the rating, and the number thereof is arbitrary.

[0024]

As described above, according to the present invention, the base having the rotary bearing member and the movable bearing member, and the both ends of the rotary bearing member and the movable bearing member of the base are axially supported to measure the stress. Corresponding to the chord material or the belly material at the target position, which corresponds to the chord material or the belly material, and the chord material or the chord material excluding the belly material at the stress measurement target position where the force gauge member is arranged. And a truss assembled from transverse members that rotatably support the general members and the force meter member, the force meter member including a probing ring, and an arbitrary transverse beam. By configuring the load gauge, the stress acting on the force gauge member can be measured via a strain gauge attached to the proving ring or via a dial gauge placed on the proving ring. Ri, large strain can measure the stress acting on the force-measuring member relatively small load,
It is easy to handle, and the stress of the truss member can be reliably measured via a strain gauge or dial gauge.

[Brief description of drawings]

FIG. 1 is a front view of a truss member stress test device of the present invention.

FIG. 2 is a plan view of a member stress test device for a truss of the present invention.

3 is a cross-sectional view taken along line XX of FIG.

FIG. 4 is an enlarged view of a Y portion of FIG.

5 is an enlarged view of a Z part in FIG. 1. FIG.

FIG. 6 is a front view of a force meter member.

FIG. 7 is a side view of the force meter member.

FIG. 8 is a schematic view showing a warren truss.

FIG. 9 is a schematic diagram showing a how truss.

[Explanation of symbols]

1 member stress experiment device 2 base 21 base frame 22 rotation support member 23 moving support member 3 truss 31 force gauge member 32 general member 33 cross beam 34 weight 36 proving ring L, L _{1 to} L ₄ lower chord member (chord member) D, D _{1 to} D ₈ diagonal material (belly material) U, U _{1 to} U ₃ upper chord material (chord material)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masao Amada 2164-3 Innan, Innan-cho, Hidaka-gun, Wakayama Prefecture (72) Inventor Yoshikazu Sakamoto 7-23-23 Kuraji, Katano-shi, Osaka Prefecture (72) Inventor Miyawaki Kojiro 11-30-8, Karigigaoka, Hirakata-shi, Osaka

Claims (1)

[Claims] 1. A base provided with a rotary bearing member and a movable bearing member, and both ends thereof are axially supported by the rotary bearing member and the movable bearing member of the base, respectively, corresponding to a chord member or a belly member at a stress measurement target position. And a general member arranged corresponding to the chord material or the abdominal material excluding the chord material or the abdominal material at the stress measurement target position in which the force meter member is disposed, and these. Of a truss assembled from a transverse girder that rotatably supports a force gauge member or a general member, and the force gauge member is provided with a probing ring and is loaded on an arbitrary transverse girder so that Through the strain gauge attached to the proving ring the acting stress,
Alternatively, a member stress test device for a truss, which is configured so that it can be measured via a dial gauge arranged on the proving ring.