JP2007205059A - Connecting structure using circular steel pipe column and h-section steel beam, and bridge pier using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a strong connecting structure permitting a low production cost and the effective utilization of a space for the connecting structure being composed of a circular steel pipe column and an H-section steel beam for construction. <P>SOLUTION: The connecting structure comprises an H-section steel beam 2 having a web 6 and two flanges 5 at both the ends of the web 6 and a circular steel pipe column 1. An axial direction of the steel pipe column 1 is aligned with a direction between flanges of the steel beam 2; a shape of an end of the steel beam 2 is aligned with a shape of the surface of the steel pipe column 1; the end of the steel beam 2 is fixed to the surface of the steel pipe column 1; further, the flanges 5 of the steel beam 2 at the fixed portion are widened in the width direction in such a manner that a fixing range in a peripheral direction of the steel pipe column has an angle α not lower than 90° but not greater than 180° from the center of a horizontal section of the steel pipe column to the widened flange portions at both ends of the widened flange portions. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a connection structure of a building constituted by a circular steel pipe column and an H-shaped cross-section steel beam, and a connection structure between a circular sheath and an H-shaped cross-section steel beam that are fitted on the outer periphery of the circular steel pipe column. Furthermore, it is related with the bridge pier comprised by connecting a circular steel pipe pillar using the said connection structure.

  As shown in FIG. 3, as a connection structure between the circular steel pipe column 1 and the H-shaped steel beam 2 (hereinafter referred to as a steel beam), a diaphragm 3 is arranged inside the circular steel pipe column 1, and the diaphragm 3 and the steel beam 2 are connected to each other. As shown in FIG. 4, a through-diaphragm type that connects the flange 5, and an outer diaphragm type that arranges an annular outer diaphragm 4 on the outer periphery of the circular steel pipe column 1 and connects the outer diaphragm 4 and the flange 5 of the steel beam 2. It has been known.

  Furthermore, in the outer diaphragm type, as a means for avoiding the difficulty of transportability and the restriction of the internal space of the building due to the outer diaphragm 4 projecting outward, and as a means for transmitting the load of the steel beam to the column member Document 1 and Patent Document 2 are disclosed.

  The invention described in Patent Document 1 is an invention in which a connection structure between a steel pipe column and a steel beam is configured in a space-saving manner by using a ring stiffener obtained by dividing an outer diaphragm into a peripheral surface of the steel pipe column at about 90 degrees. On the other hand, the invention described in Patent Document 2 widens the internal space of the building by widening the steel beam flange closer to the connection steel pipe in the connection structure of the connection steel pipe and the steel beam arranged around the concrete column. It is the invention characterized by doing.

  As means for allowing construction errors between the circular steel pipe column 1 and the steel beam 2 and simplifying the construction, Patent Document 3, Patent Document 4 and Patent Document 5 include a circular sheath tube as shown in FIG. 7 is disclosed.

  In the inventions described in Patent Document 3 and Patent Document 4, a steel ring is inserted into a steel pipe column, and a steel ring and a joining ring made of a gusset and a ring made of steel pipe that has a larger inner diameter than the outer diameter of the steel pipe column and forms a required clearance between the columns. Since the gusset is not arranged at the time of transportation and construction of the steel pipe column, workability can be improved. Furthermore, because of the clearance, it is easy to absorb column construction errors.

  The invention described in Patent Document 5 is a connection structure in which a hollow inner tubular tube is inserted into a steel tube column and filled with concrete to be integrated, and the quality reliability of field welding can be solved.

  In addition, in the connection structure of the circular sheath and the tube and the steel beam described in these Patent Documents 3 to 5, when the diaphragm is disposed through the circular sheath and the pipe, the insertion is inhibited and the filling property of the concrete placement is lowered. Generally, an outer diaphragm type is used.

By the way, in Patent Document 6, a plurality of circular steel pipe columns (described as “steel pipe pile” in Patent Document 6) are connected by a steel beam using a low yield point steel material (described as “connecting member” in Patent Document 6). Thus, an invention relating to a seismic pier that constitutes a set of piers is disclosed. According to the present invention, when a seismic force is applied, the steel beam yields before the circular steel pipe column, so that the circular steel pipe column can be protected from the seismic force without being damaged.
JP 2002-161581 A JP 2004-108063 A Japanese Patent Application Laid-Open No. 5-214736 JP-A-7-180165 Japanese Patent Laid-Open No. 5-31746 JP 2005-299080 A

  Since the through diaphragm type and the outer diaphragm type transmit the load acting on the flange 5 of the steel beam 2 to the diaphragm, a strong connection structure can be obtained. Here, the through diaphragm type is manufactured by cutting the steel pipe column 1 and welding the diaphragm 3 and then welding and connecting the steel pipe column again. Therefore, the diaphragm type is a process such as cutting and re-welding the steel pipe. The problem is that it takes a lot of time and effort. Moreover, when filling concrete in a steel pipe, not only does the diaphragm 3 impair the filling property, but there is a problem that an unfilled portion is generated in the vicinity of the diaphragm 3.

On the other hand, in the manufacture of the outer diaphragm type, an annular outer diaphragm 4 having a size that fits just around the outer periphery of the steel pipe column 1 is cut out from the steel plate, and the outer diaphragm 4 is fitted into the steel pipe column 1 to form the steel beam 2. This is done by welding and joining to the steel pipe column 1 at the connection position of the flange 5. Here, in such an outer diaphragm type, since an annular plate is cut out from the steel plate when the outer diaphragm 4 is manufactured, there is a problem that a lot of waste is generated in the steel plate and the yield of the material is deteriorated.
In addition, the outer diaphragm type has protrusions other than the steel beam connection range, so there is a problem in transportability, and the protrusions may be deformed or damaged by colliding with other objects during transportation and installation. .
In addition, particularly when there is a site restriction, it is necessary to arrange the steel pipe columns on the inner side by an amount corresponding to the protruding portion, which hinders effective use of the space, resulting in an uneconomic structure. Furthermore, the projecting portion has a problem that it is not preferable in terms of durability because rainwater, dust, and the like tend to accumulate, and is not preferable in terms of aesthetics.

  In the invention described in Patent Document 1, the outer diaphragm is divided, but in the cross section perpendicular to the connecting portion of the steel beam of the steel pipe column, there is a protruding portion similar to the conventional outer diaphragm, so that the transportability is difficult. Has not been solved, and it has become an uneconomical structure that hinders effective use of space.

On the other hand, the invention described in Patent Document 2 is an invention directed to a concrete column, and has a structure in which a load transmission mechanism is different from a circular steel pipe column targeted by the present invention, but a flange is widened at a connection portion. It has a structure.
However, the widening of the flange shown in the invention described in the literature reinforces the bending strength of the steel beam, and when a load is applied to the steel beam, the connecting steel pipe easily deforms. The problem is that the load of the steel beam cannot be reliably transmitted to the connecting steel pipe. Furthermore, although it is shown that the widened portions of the steel beams connected adjacent to each other are separated from each other, it can be seen that the central angle of the circular steel pipe cross section is less than 90 degrees.
In addition, since the connection structure using a circular sheath and a tube is of the outer diaphragm type, the problem of the circular shape and the tube format has the same problem as the above-described outer diaphragm type.

  Incidentally, FIG. 5 of Patent Document 4 shows a structure in which a joining ring and an H-shaped steel beam are directly fixed without using an outer diaphragm. However, when the steel beam flange is directly fixed to the circular sheath or pipe, the roundness or tube easily deforms against the load acting on the steel beam. I can't communicate.

  In the present invention, (1) it is possible to reduce production costs such as cutting and re-welding of steel pipes, reducing processing costs, reducing waste of materials, and (2) easy transportation of circular steel pipe columns, There is no fear of deformation or damage of the projecting part during transportation or construction, and there is no hindrance to effective use of the space. (3) The load acting on the steel beam is reliably transmitted to the round steel pipe column, and the round steel pipe column is deformed. An object of the present invention is to provide a strong connection structure between a circular steel pipe column and an H-shaped steel beam and a bridge pier using the connection structure.

In order to advantageously solve the above-described object, the following configuration is provided.
A first invention is a connection structure of a web and an H-shaped cross-section steel beam having two flanges at both ends thereof and a circular steel pipe column, wherein the axial direction of the steel pipe column and the direction between the flanges of the steel beam are aligned. And the shape of the end of the steel beam is matched to the shape of the surface of the steel pipe column, the end of the steel beam is fixed to the surface of the steel pipe column, and the flange of the steel beam in the fixed portion is The steel tube column is widened so that the fixing range in the circumferential direction of the steel tube column is 90 ° or more and 180 ° or less at an angle formed with the center of the cross section of the steel tube column.
A second invention is a connection structure of a web and an H-shaped cross-section steel beam having two flanges at both ends thereof and a steel circular sheath inserted into the outer periphery of a circular steel tube column, and the shaft of the sheath tube Aligning the direction and the direction between the flanges of the steel beam, and matching the shape of the end of the steel beam to the shape of the surface of the sheath tube, and fixing the end of the steel beam to the surface of the sheath tube, Further, the flange of the steel beam in the fixing portion is widened so that the fixing range in the sheath circumferential direction is 90 degrees or more and 180 degrees or less at an angle formed with the center of the sheath section. Features.
A third invention is characterized in that, in the first invention or the second invention, a circular steel pipe column is filled with a filling hardening material such as concrete or mortar.
The fourth invention is characterized in that, in the second or third invention, a filling hardening material such as concrete or mortar is filled between the sheath pipe and the steel pipe column.
5th invention connected the two circular steel pipe pillars in the pier using the connection structure of the circular steel pipe pillar in any one of 1st-4th invention, and an H-shaped cross-section steel beam, It is characterized by the above-mentioned. .
6th invention arrange | positions four circular steel pipe pillars in each corner at a bridge pier, and adjoins said steel pipe pillars to either of the round steel pipe pillars of 1st invention, and H-shaped cross-section steel beams. They are connected using a connection structure.

According to the present invention, in the connection structure between a circular steel pipe column and a steel beam, production labor such as cutting and re-welding of the steel pipe can be suppressed as much as possible.
Further, since it is possible to eliminate the waste of materials in the manufacture of the outer diaphragm, it is possible to provide an inexpensive connection structure with reduced processing costs.
Furthermore, unlike the conventional outer diaphragm type, there is no protruding part from the circular steel pipe column outside the steel beam connection range, making it easy to transport the circular steel pipe column, and preventing deformation and damage of the protruding part during transportation and construction. No fear or hindrance to effective use of space. In addition, it is possible to provide a connection structure that is free of rainwater and dust and has excellent durability and aesthetics.
Moreover, in the case of the structure in which the concrete 15 is filled in the circular steel pipe column 1, since there is no through diaphragm which becomes an obstacle to concrete filling in construction, the concrete can be filled densely, and the connection structure with excellent quality It can be.
Furthermore, since the load acting on the steel beam 2 can be reliably transmitted to the circular steel pipe column 1 and deformation of the circular steel pipe column 1 can be suppressed, a strong connection structure can be provided.

  The present invention is an invention aimed at forming a strong connection structure with a low manufacturing cost, enabling effective use of space in a connection structure of a circular steel pipe column and a steel beam. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

  A connection structure of a web and an H-shaped cross-section steel beam having two flanges at both ends thereof and a circular steel pipe column, wherein the axial direction of the steel pipe column and the direction between the flanges of the steel beam are aligned, and the steel pipe column Matching the shape of the end of the steel beam to the shape of the surface, the end of the steel beam is fixed to the surface of the steel pipe column, and the flange of the steel beam in the fixed portion is the circumferential direction of the steel pipe column Is fixed so that the fixing range is 90 degrees or more and 180 degrees or less at an angle formed with the center of the cross section of the steel pipe column.

  FIG. 1 is a view showing a connection structure of a circular steel pipe column 1 and a steel beam 2 according to the first embodiment of the present invention. As shown in FIG. 1, a circular steel pipe column 1, a web 6, and an H-shaped steel beam 2 having two flanges 5 at both ends thereof are connected to the axial direction (vertical direction in the figure) of the circular steel pipe column 1 and the steel beam 2. And the end of the steel beam 2 are matched to the shape of the surface of the circular steel pipe column 1 (according to the curvature of the steel pipe column), and the surface of the steel pipe column The end of the steel beam is fixed, and the circular steel pipe column 1 and the steel beam 2 are connected. The axial direction (vertical direction in the figure) of the circular steel pipe column 1 and the flange-to-flange direction (vertical direction in the figure) of the steel beam 2 are aligned on the same plane in parallel. Simplifies to define the angle formed by the center of the cross section of the steel pipe column on a plane perpendicular to the axial direction of the circular steel pipe column.

The steel beam 2 is fixed to the surface of the circular steel pipe column 1 by fixing the flange 5 and the web 6 of the steel beam 2 by welding.
The flange 5 of the steel beam 2 in the fixing portion is widened so that the fixing range in the circumferential direction of the circular steel pipe column 1 is 90 degrees or more and 180 degrees or less at an angle formed with the center of the cross section of the circular steel pipe column 1. That is, when the angle between the straight lines 13 connecting the center 11 of the cross section of the steel pipe and the flange connecting outer edges 12 at both ends in the width direction of the flange widened portion is the center angle 9 (α), the center angle 9 (α) is 90 degrees or more and 180 degrees. The flange widening part 10 is formed so that it may become the following.
In addition, in FIG. 1, although the side part of the flange widening part 10 is made into the linear shape, it may be a curved line shape or the polygonal line shape which combined multiple straight lines. In particular, when the fixing range in the circumferential direction of the circular steel pipe column 1 is 180 degrees at the angle formed with the center of the cross section of the circular steel pipe column 1, it is necessary to form a curved line or a polygonal line shape.
Further, if the fixing range in the circumferential direction of the circular steel pipe column 1 is 90 degrees or more in the angle formed with the center of the cross section of the circular steel pipe column 1, an error in production is allowed and is slightly less than 90 degrees ( For example, 90 degrees minus several degrees) is not a problem on the effect of the invention.
Further, as shown in FIG. 1, it is preferable that the flange widened portion 10 is substantially symmetrical with respect to the web 6 because it is easy to process, but it may not be symmetrical.

  Thereby, unlike the through diaphragm type and the outer diaphragm type, the degree of processing can be drastically omitted, and the production cost can be reduced. Further, since there is no protruding portion other than the steel beam connection range as in the outer diaphragm type, transportation becomes easy, and there is no fear of deformation or damage of the protruding portion during transportation or construction.

  Moreover, when there is site restriction, the steel pipe column can be arranged at the outermost edge, so that the space can be used effectively and an economical structure can be constructed. Furthermore, since the flange widening portion 10 is formed in a range where the central angle 9 (α) is 90 degrees or more, the load of the flange 5 is reliably transmitted to the circular steel pipe column 1 and a strong connection structure is provided. Can do. Further, when the center angle 9 (α) exceeds 180 degrees, the width of the flange 5 becomes equal to or larger than the diameter of the steel pipe column 1, and thus a protrusion is generated, which is not preferable. Therefore, the upper limit is set to 180 degrees or less. .

In addition, about the dimension shape of the widening part 10, the flange widening part 10 becomes larger than the steel pipe tangent 14 in the flange connection outer edge 12 so that a load may be smoothly transmitted from the flange connection outer edge 12 to the flange 5 general part. It is desirable to be formed.
The connection between the circular steel pipe column 1 and the flange 5 (the widened portion 10) is connected by welding, and butt welding is generally desirable. Further, in the processing of the widened portion of the flange, the thick plate is formed by welding assembly of the thick plate formed with the widened portion or by connecting the thick plate to a part of the rolled H-section steel.
Further, in FIG. 1, the steel beam 2 is shown as an integral structure. However, in consideration of assembly at the site, a member previously connected to the circular steel pipe column is built and connected to the vicinity of the widened portion by factory processing. A structure in which steel beams are connected by bolt connection may be used.

  FIG. 2 is a view showing a connection structure between the circular steel pipe column 1 and the steel beam 2 according to the second embodiment of the present invention. As shown in FIG. 2, in the second embodiment, a circular sheath 7 having an inner diameter larger than the outer diameter of the circular steel tube column 1 is fitted on the outer periphery of the circular steel tube column 1. Since the steel beam 2 is fixed to the same as in the first embodiment, the circular steel pipe column 1 and the steel beam 2 are connected.

That is, the flange 5 and the web 6 of the steel beam 2 are fixed to the circular sheath 7 by welding. When the angle of a straight line (normal line) 13 connecting the cross-sectional center 11 of the steel pipe and the flange connection outer edge 12 is a central angle 9 (α), the flange widened portion 10 is formed so that the central angle 9 (α) is at least 90 degrees. Has been. Unlike the conventional connection structure using the outer diaphragm type, the degree of processing can be drastically omitted, and the manufacturing cost can be reduced. In addition, since the flange widening portion is in the range where the central angle 9 (α) is 90 degrees or more, the load of the flange 5 can be reliably transmitted to the circular sheath 7 and a strong connection structure can be obtained.
It is preferable that the gap between the circular steel pipe column 1 and the circular sheath 7 is filled with a filling and hardening material such as concrete 8 or mortar. The filling and curing material may be an organic material such as epoxy or acrylic. In addition, when not filling with a filling hardening material, in order to connect the circular steel pipe pillar 1 and the circular sheath and the pipe | tube 7, a ring-shaped steel material can be fixedly connected by welding to a sheath pipe upper and lower part.

  The third embodiment of the present invention is a structure (not shown) in which concrete is filled in the circular steel pipe column 1 of FIGS. Further, in order to transmit shearing force in the connection range between the circular steel pipe column 1 and the circular shape or the tube 7 in FIG. (Not shown) may be arranged.

  Here, the reason why the flange widened portion 10 is formed in a range where the central angle 9 (α) of the cross section of the steel pipe is 90 degrees or more will be a strong connection structure.

  FIG. 6A shows a structure in which the circular steel pipe column 1 filled with concrete and the flange 5 of the steel beam 2 are directly fixed without being widened. In this case, generally, the central angle 9 (α) of the cross section of the steel pipe is about 20 to 50 degrees. When a tensile force indicated by an arrow is applied to the flange 5, an out-of-plane load is applied to the circular steel pipe column 1. Therefore, as shown in FIG. Deformation occurs. This is because even if a uniform tensile force acts on the flange 5, the load concentrates on the flange connection outer edge 12 at the connection portion between the circular steel pipe column 1 and the steel beam 2. That is, the force at the flange connection outer edge 12 can be divided into a tangential force 17 and a normal force 16 of the steel pipe (circular steel pipe column), but the steel pipe has a high resistance to the tangential force 17 of the steel pipe. Although exerted, since the resistance force of the normal direction force 16 is extremely small, deformation occurs in the out-of-plane direction. Originally, a strong proof strength and rigidity are required for the connection structure between the circular steel pipe column 1 and the steel beam 2, but when the central angle 9 (α) of the steel pipe cross section is small, the deformation in the out-of-plane direction is large. Therefore, necessary connection strength and connection rigidity cannot be secured.

  FIG. 7 (a) shows that the flange 5 has a center angle 9 (α) of the steel pipe cross section of the circular steel pipe column 1 of 90 ° or more at the connecting portion between the circular steel pipe column 1 filled with concrete and the flange 5 of the steel beam 2. A widened and fixed structure is shown. When a tensile force acts on the flange 5, as shown in FIG. 7B, out-of-plane deformation occurs in the circular steel pipe column 1 as in FIG. 6B. However, when the flange connection outer edge 12 is divided into a tangential force 17 and a normal force 16 of the steel pipe, the normal force 16 becomes small when the central angle 9 (α) of the cross section of the steel pipe is 90 degrees or more. Therefore, the amount of out-of-plane deformation is dramatically reduced. On the other hand, since the tangential force 17 is increased, the transmission force to the circular steel pipe column 1 is dramatically increased. Therefore, when the central angle 9 (α) of the cross section of the steel pipe is 90 degrees or more, the connection structure is strong and has high rigidity without disposing the outer diaphragm.

  Here, an example of analysis for connection structures with different center angles (α) of the cross section of the steel pipe will be shown. FIG. 8 shows an analysis for a structure in which a circular steel pipe column filled with concrete having an outer diameter of 610 mm and a plate thickness of 12.7 mm is connected to a flange having a plate width of 120 mm and a plate thickness of 12 mm. The analysis cases are a case in which the flange is not widened, a case in which the flange is widened in the range where the central angle (α) is 46 degrees, and a case in which the flange is widened in the range where the central angle (α) is 90 degrees. Here, the center angle (α) of the case without the flange widening is 23 degrees. The yield strength of the flange is 570 kN.

FIG. 8 is a diagram showing the tensile load acting on the flanges obtained in the above three cases on the vertical axis and the displacement amount of the flange on the horizontal axis. The case with no flange widening (center angle 23 degrees) is greatly deformed as the load increases, and does not reach the yield load (570 kN) of the flange. This is because when the flange does not have a widened portion, the flange and the steel pipe connection are deformed in addition to the extension of the flange, and as a result, the steel pipe connection is less than the yield load of the flange. It shows that it has been destroyed.
In the case where the central angle (α) is 46 degrees, the flange displacement is smaller than in the case where the flange is not widened, and finally the yield load (570 kN) has been reached. It shows that a large deformation occurs in the steel pipe connection.

  On the other hand, in the case where the central angle (α) is 90 degrees, the deformation is linear up to the yield load (570 kN), and after reaching the flange yield load (570 kN), a clear bending occurs and the deformation increases. ing. This indicates that only deformation of the flange occurs without deformation of the steel pipe connection portion. That is, when the center angle (α) is 23 degrees, the connection portion is broken before the yield load of the flange is reached, and when the center angle is 46 degrees, the yield load is reached, but the steel pipe connection portion is greatly deformed, so The rigidity is not secured. On the other hand, when the center angle (α) is 90 degrees, it is indicated that the yield load of the flange and the rigidity of the connecting portion can be ensured.

The pier which is 4th embodiment of this invention is shown in FIG. The fourth embodiment has a structure in which four circular steel pipe columns 1 are arranged at four corners and adjacent circular steel pipe columns 1 are connected by four steel beams 2. The installation range of the steel beam flange 5 and the circular steel pipe column 1 is widened so that the center angle 9 (α) of the cross section of the steel pipe is more than 90 degrees. When there is a restriction, the circular steel pipe column 1 can be arranged at the outermost edge, and the space can be used effectively. Furthermore, it can be set as the structure excellent also in scenery property and excellent in durability.
Moreover, also when arrange | positioning the decorative wall 18 in the outer periphery of the circular steel pipe pillar 1, a cross-sectional shape can be made small.

  On the other hand, FIG. 11 shows a sectional view using a conventional outer diaphragm type in a structure in which four circular steel pipe columns 1 are connected by four steel beams 2. Compared with FIG. 9 of the present invention, since the outer diaphragm 4 protrudes to the outside of the circular steel pipe column 1, when there is a site restriction, the circular steel pipe column 1 needs to be arranged on the inside, and the space is effective. Cannot be used. In addition, there are issues with landscape and durability. In addition, when placing a decorative wall, it is necessary to extend further to the outside, and if there are site restrictions and restrictions on the dimensions of the foundation structure, the space cannot be used effectively, resulting in an uneconomic structure. .

  Although FIG. 9 shows four circular steel pipe columns as an object, FIG. 10 shows an embodiment of the present invention in which two circular steel pipe columns 1 are connected by a steel beam 2. As described above, the present invention is similarly applied to a bridge pier constituted by two circular steel pipe columns.

It is a figure which shows one form of the connection structure of the circular steel pipe pillar and steel beam of this invention, (a) is a longitudinal cross-sectional view of a connection structure, (b) shows the cross-sectional view of a connection structure. It is a figure which shows another form of the connection structure of the circular steel pipe pillar and steel beam of this invention, (a) is a longitudinal cross-sectional view of a connection structure, (b) shows the cross-sectional view of a connection structure. It is a figure which shows the connection structure of the conventional circular steel pipe column and a steel beam, (a) is a longitudinal cross-sectional view of a connection structure, (b) shows the cross-sectional view of a connection structure. It is a figure which shows the connection structure of the conventional circular steel pipe column and a steel beam, (a) is a longitudinal cross-sectional view of a connection structure, (b) shows the cross-sectional view of a connection structure. It is a figure which shows the connection structure of the conventional circular steel pipe column and a steel beam, (a) is a longitudinal cross-sectional view of a connection structure, (b) shows the cross-sectional view of a connection structure. It is a figure explaining the load transmission mechanism of the connection structure of the conventional round steel pipe pillar and a steel beam, (a) is a cross-sectional view, (b) is a deformation | transformation figure at the time of a load action. It is a figure explaining the load transmission mechanism of the connection structure of the circular steel pipe pillar and steel beam of this invention, (a) is a cross-sectional view, (b) is a deformation | transformation figure at the time of a load effect | action. It is a figure which shows the result of the example of an analysis of a circular steel pipe column and a steel beam connection structure. It is sectional drawing connected with four steel pipe pillars and four steel beams by this invention. It is sectional drawing connected with two steel pipe pillars and two steel beams by this invention. It is sectional drawing connected with four steel pipe pillars and four steel beams by a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Round steel pipe pillar 2 H-shaped cross-section steel beam 3 Through diaphragm 4 Outer diaphragm 5 Flange 6 Web 7 Circular sheath pipe 8 Concrete 9 Center angle of steel pipe cross section 10 Widening part 11 Center of steel pipe cross section 12 Flange connection outer edge 13 Steel pipe of flange connection outer edge Normal 14 Steel pipe tangent 15 of flange connection outer edge Concrete 16 Normal direction force 17 of flange connection outer edge Tangential force 18 of flange connection outer edge Decorative wall

Claims (6)

  A connection structure of a web and an H-shaped cross-section steel beam having two flanges at both ends thereof and a circular steel pipe column, wherein the axial direction of the steel pipe column and the direction between the flanges of the steel beam are aligned, and the steel pipe column Matching the shape of the end of the steel beam to the shape of the surface, the end of the steel beam is fixed to the surface of the steel pipe column, and the flange of the steel beam in the fixed portion is the circumferential direction of the steel pipe column The connection structure of the circular steel pipe column and the H-shaped cross-section steel beam is widened so that the fixing range is 90 degrees or more and 180 degrees or less at an angle formed with the center of the cross section of the steel pipe column.   A connection structure of a web and an H-shaped cross section steel beam having two flanges at both ends thereof and a steel circular sheath inserted into the outer periphery of a circular steel pipe column, the axial direction of the sheath pipe and the steel beam Align the direction between the flanges, and match the shape of the end of the steel beam to the shape of the surface of the sheath tube, and fix the end of the steel beam to the surface of the sheath tube. The flange of the steel beam is widened so that the fixing range in the sheath circumferential direction is 90 degrees or more and 180 degrees or less at an angle formed with the center of the sheath section. And H-section steel beam connection structure.   3. The connection structure of a circular steel pipe column and an H-shaped cross-section steel beam according to claim 1 or 2, wherein the circular steel pipe column is filled with a filling hardening material such as concrete or mortar.   4. The connection structure between a circular steel pipe column and an H-shaped cross-section steel beam according to claim 2 or 3, wherein a filling hardening material such as concrete or mortar is filled between the sheath pipe and the steel pipe column.   The bridge pier characterized by connecting two circular steel pipe pillars using the connection structure of the circular steel pipe pillar and H-section steel beam of any one of Claims 1-4.   Four circular steel pipe columns are respectively arranged at four corners, and the adjacent steel pipe columns are connected to each other using the connection structure of the circular steel pipe columns and the H-shaped cross-section steel beam according to any one of claims 1 to 4. A pier characterized by that.

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