CN106680095B - Loading device for assembled special-shaped column structure and test method thereof - Google Patents

Loading device for assembled special-shaped column structure and test method thereof Download PDF

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Publication number
CN106680095B
CN106680095B CN201710136028.1A CN201710136028A CN106680095B CN 106680095 B CN106680095 B CN 106680095B CN 201710136028 A CN201710136028 A CN 201710136028A CN 106680095 B CN106680095 B CN 106680095B
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special
shaped column
column
support
door frame
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CN201710136028.1A
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CN106680095A (en
Inventor
陈海彬
武立伟
李文硕
张云发
李香薇
杨秋梅
张璐
陈建飞
张红
周计书
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Hebei Kegong Construction Group Co ltd
North China University of Science and Technology
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Hebei Kegong Construction Group Co ltd
North China University of Science and Technology
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0001—Type of application of the stress
    • G01N2203/0003—Steady
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0017—Tensile
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0019—Compressive
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/0202—Control of the test
    • G01N2203/0208—Specific programs of loading, e.g. incremental loading or pre-loading
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/067—Parameter measured for estimating the property
    • G01N2203/0682—Spatial dimension, e.g. length, area, angle

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)

Abstract

The invention relates to an assembly type special-shaped column structure loading device and a test method thereof, wherein the loading device comprises the following steps: the device comprises a left side portal, a right side portal, a pressing beam, a column support, a lateral support, an actuator loading head, a rolling friction support, a displacement meter for acquiring the displacement of the special-shaped column body and a beam end fixing device of the special-shaped column body; the left side door frame is parallel to the right side door frame; the door frame comprises a door frame beam and a door frame column; the two ends of the pressing beam are connected with the door frame beam through bolts; one end of the actuator loading head is connected with the actuator, and the other end of the actuator loading head is connected with the special-shaped column; the displacement meter is fixed on a vertical upright post connected with the pedestal; the portal beam is fixed on the pedestal; the column support is fixed on the pedestal. The loading device and the testing method of the assembled special-shaped column structure are simple and convenient to operate and easy to install, and can carry out loading tests on the L-shaped, T-shaped and cross-shaped assembled special-shaped columns with different sections; the test data is accurate and the measurement accuracy is high.

Description

Loading device for assembled special-shaped column structure and test method thereof
Technical Field
The invention relates to a loading test of an assembled steel tube concrete special-shaped column, in particular to a loading device of an assembled special-shaped column structure and a testing method thereof.
Background
In the fabricated steel pipe concrete special-shaped column structure, the stress performance of the joints and the column joints directly determine the overall performance of the structure, so that the joints and the joints with reasonable stress and convenient construction are key to the fabricated concrete structural design, and are important influencing factors for determining whether the structural form can be popularized and applied. The prefabricated special-shaped column structure is a structural form that a special-shaped column body is prefabricated in a factory and is transported to a construction site for assembly. The prefabrication rate of the structural system is high, but the connection structure of the joint is complex, the construction difficulty is high, the structural system is difficult to ensure to be completely equivalent to a cast-in-situ special-shaped column structure, and more structural earthquake resistance tests are needed to verify the reliability of the structure. Therefore, in order to better develop the earthquake resistance test of the assembled steel pipe concrete special-shaped column node, a simple, convenient and effective special-shaped column test loading device is needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the loading device for the assembled special-shaped column structure, which ensures smooth performance of the steel tube concrete special-shaped column test and has simple structure and convenient installation.
The technical scheme adopted by the invention is as follows:
an assembled special-shaped column structure loading device, comprising: the device comprises a left side portal, a right side portal, a pressing beam, a column support, a lateral support, an actuator loading head, a rolling friction support, a displacement meter for acquiring the displacement of the special-shaped column body and a beam end fixing device of the special-shaped column body;
the left side door frame is parallel to the right side door frame;
the door frame comprises a door frame beam and a door frame column;
the two ends of the pressing beam are connected with the door frame beam through bolts;
the upper surfaces of the two ends of the pressing beam are attached to the lower surfaces of the door frame beams;
the pressing beam is perpendicular to the left side door frame and the right side door frame;
the pressing beam is positioned at the middle position of the left side door frame beam and the right side door frame beam;
a rolling friction support is arranged below the pressing beam;
one end of the actuator loading head is connected with the actuator, and the other end of the actuator loading head is connected with the special-shaped column; the displacement meter is fixed on an upright post connected with the pedestal;
the lower ends of the upright posts of the special-shaped columns are arranged on the column support seats; the column support comprises a column shoe and a column support bottom plate connected with the column shoe;
a jack is arranged below the rolling friction support;
the base of the jack is contacted with the top end of the upright post of the opposite-type cylinder;
the top end of the jack is contacted with the lower surface of the rolling friction support;
the portal beam is fixed on the pedestal; the column support is fixed on the pedestal.
The two ends of the upright post are fixed, the upper end of the upright post is connected with the pressing beam, and the lower end of the upright post is connected with the pedestal; three displacement meters are arranged to respectively collect the displacement of the column top, the column middle and the column foot of the opposite column.
The beam end fixing device of the special-shaped column body comprises a beam support base, a tension and compression sensor, an upper connecting joint, a lower connecting joint, an upper fastening screw rod, a lower fastening screw rod and two connecting plates;
the beam support base is connected with the lower connector through a hinge shaft I;
the beam end is clamped by an upper connecting plate, a lower connecting plate and four screws;
the upper connector is connected with the lower connecting plate through a hinge shaft I;
the pulling and pressing sensor is connected with the upper connector and the lower connector through upper and lower connecting fastening screws;
the upper and lower connecting fastening screw rods are respectively provided with a positive and a negative buckle so as to better adjust the tightness of the tension and compression sensor and avoid the stress of the loading front beam end;
the rolling friction support comprises a cylindrical roller, a sliding plate and a fixed plate;
the fixed plate is connected with the pressing beam through a screw rod;
the sliding plate is hung on the fixed plate through a bearing II;
a cylindrical roller is arranged between the sliding plate and the fixed plate.
The square steel pipe in the lateral support is welded with the inclined support, and the inclined support is fixed on the left side portal and the right side portal by using screws;
the rolling bearing at the front end of the lateral support is propped against the side edge of the special-shaped column body;
the lateral support comprises a lateral adjusting component, a lateral reinforcing plate, a square steel pipe and an inclined support.
The lateral reinforcing plate is two iron plates with the thickness of 15mm, and the lateral reinforcing plate is used for reinforcing the strength and rigidity of the lateral support, providing enough lateral supporting force for the special-shaped column body and preventing the special-shaped column body from tilting.
The lateral adjusting component of the lateral support consists of a bearing positioning plate, reinforcing steel bars and a bearing, the bearing II is fixed through the bearing positioning plate, the bearing positioning plate is connected with an adjusting long plate, two adjusting holes are formed in the adjusting long plate, the lateral adjusting component freely slides on the fixed long plate, and the extension amount is adjusted through the extension of the lateral adjusting component so as to adapt to special-shaped columns of various sizes.
The actuator loading head consists of a front steel plate, a rear steel plate, a connecting plate, stiffening ribs I, stiffening ribs II and 4 screws;
the thickness of the steel plate is 30mm, and the diameter of the screw is 42mm.
The front steel plate and the rear steel plate are welded through stiffening ribs, the front steel plate is connected with the actuator, the rear steel plate is connected with the connecting plate through a screw rod, and the special-shaped column body is clamped so as to apply horizontal pushing force and pulling force through the actuator.
The door frame column is formed by splicing two channel steel middle welded lacing plates, and a hole is formed in the middle of the channel steel and used for connecting a door frame beam;
the portal frame base is formed by welding steel plates, holes are symmetrically formed in two sides of the base, and the portal frame base is fixed on the pedestal through bolts;
the door frame beam is formed by welding steel plates, and two ends of the beam are provided with holes and are connected to the door frame column by bolts.
A method for testing an assembled special-shaped column of an assembled special-shaped column structure loading device comprises the following steps:
a. according to the design height of the special-shaped column body, adjusting the position of the actuator to enable the actuator and the loading end of the special-shaped column body to be at the same horizontal height; assembling a left side portal, a right side portal and a pressing beam, and adjusting the position of the pressing beam to enable the special-shaped column body to be positioned right below the pressing beam; the rolling friction support is installed, so that the rolling friction support is fixed with the pressing beam, and the position of the rolling friction support is adjusted, so that the rolling friction support is coaxial with the centroid of the special-shaped column body;
b. according to the design size of the special-shaped column body, the positions of the column body, the column support base plate and the beam support base are adjusted, and the column support base plate and the beam support base are fixed on the pedestal by adopting screws; installing a column shoe, hoisting the special-shaped column body, adjusting an adjusting nut on the column shoe to enable the special-shaped column body to reach a designated position, and screwing the adjusting nut to fix the special-shaped column body; the beam end fixing device of the special-shaped column body is installed, the pull-press sensor is connected with the beam supporting base through the hinge shaft and the fastening screw rod after the special-shaped column body is fastened, and the upper fastening screw rod and the lower fastening screw rod are adjusted to enable the beam end to be in a smaller tensile stress state so as to ensure that the special-shaped column body is stable;
c. fixing the lateral support, and adjusting the adjusting component to enable the rolling bearing to prop against the side edge of the special-shaped column floor slab; assembling the special-shaped column body and the actuator connecting plate, and screwing up the screw rod to enable the actuator to be tightly connected with the special-shaped column body so as to provide horizontal load; a jack at the top end of the special-shaped column is installed, so that the axis of the jack is positioned at the centroid of the special-shaped column to provide axial force of the special-shaped column; and fixing the displacement meter support upright post, and adjusting the positions of the three displacement meters to measure the displacement values of the column top, the column and the column foot of the special-shaped column body.
d. In the loading process, axial force is applied by a jack firstly so as to simulate the dead weight of the superstructure; applying horizontal pushing force and pulling force through an actuator, measuring the relative displacement of the top and the bottom of the special-shaped column through a displacement meter, and obtaining a force-displacement curve of the column top so as to draw a hysteresis curve and a skeleton curve of the special-shaped column and reflect the earthquake resistance and the energy consumption performance of the special-shaped column; the interlayer displacement angle of the special-shaped column body can be obtained through the displacement values of the column top, the column middle and the column foot, and the ductility coefficient of the special-shaped column body can be calculated to evaluate the ductility performance of the special-shaped column body.
Compared with the prior art, the invention has the beneficial effects that:
the loading device for the assembled special-shaped column structure is simple and convenient to operate and easy to install, and can carry out loading tests on L-shaped, T-shaped and cross-shaped special-shaped columns with different sections; the test data is accurate and the measurement accuracy is high.
Drawings
FIG. 1 is a front view of an assembled special-shaped column structure loading device of the present invention;
FIG. 2 is a side view of the assembled profiled pole structure loading device of the present invention;
FIG. 3 is a top view of the assembled special-shaped column structure loading device of the present invention;
FIG. 4 is a front view of a column support of the fabricated contoured column structure loading device of the present invention;
FIG. 5 is a side view of a column support of the fabricated contoured column structure loading device of the present invention;
FIG. 6 is a front view of a beam mount of the fabricated special-shaped column structure loading device of the present invention;
FIG. 7 is a side view of a beam mount of the fabricated special-shaped column structure loading device of the present invention;
FIG. 8 is a schematic view of a rolling friction support device of an assembled profiled column structure loading device of the present invention;
FIG. 9 is a schematic structural view of the lateral support of the fabricated special-shaped column structure loading device of the present invention;
FIG. 10 is a schematic cross-sectional view of FIG. 9 at 1-1;
FIG. 11 is a schematic view of the actuator loading head of the assembled special-shaped column structure loading device of the present invention.
The main component symbols in the drawings illustrate:
1. the left side portal 2, the right side portal 3, the press beam 4, the column shoe 5, the column support bottom plate 6, the beam support base 7, the hinge shaft i 8, the tension-compression sensor 9, the actuator loading head 10, the hinge shaft ii 11, the rolling friction support 12, the lateral support 13, the actuator 14, the jack 15, the profiled cylinder 16, the counter-force wall 17, the pedestal 18, the lower connector 19, the lower connection fastening screw 20, the upper connection fastening screw 21, the upper connector 22, the lower connection plate 23, the upper connection plate 24, the adjusting nut 25, the upright post 26, the displacement gauge 27, the square steel tube 28, the lateral reinforcement plate 29, the adjusting assembly 30, the cylindrical roller 31, the sliding plate 32, the fixing plate 33, the bearings i, 34, the bearing ii 35, the bearing positioning plate 36, the fixing long plate 37, the adjusting hole 38, the diagonal support 39, the reinforcing steel bar 40, the adjusting long plate 41, the front steel plate 42, the rear steel plate 43, the connection plate 44, the stiffening rib i 45, the stiffening rib ii 46, the screw.
Detailed Description
The invention is described in detail below with reference to the attached drawings and examples:
as can be seen from fig. 1 to 11, an assembled special-shaped column structure loading device,
comprising the following steps: the device comprises a left side portal 1, a right side portal 2, a pressing beam 3, a column support, a lateral support 12, an actuator loading head 9, a rolling friction support 11, a displacement meter 26 for collecting the displacement of a special-shaped column 15 and a beam end fixing device of the special-shaped column;
the left side portal 1 is parallel to the right side portal 2;
the door frame comprises a door frame beam and a door frame column; the door frame is shaped like a Chinese character 'men';
the two ends of the pressing beam 3 are connected with the door frame beam through bolts;
the upper surfaces of the two ends of the pressing beam 3 are attached to the lower surfaces of the door frame beams;
the pressing beam 3 is perpendicular to the left side door frame 1 and the right side door frame 2; the pressing beam 3 is perpendicular to the left side door frame beam and the right side door frame beam;
the pressing beam 3 is positioned at the middle position of the left side door frame beam and the right side door frame beam;
a rolling friction support 11 is arranged below the pressing beam 3;
the rolling friction support 11 is connected with the pressing beam 3 through bolts, and the position of the rolling friction support 11 on the pressing beam is adjustable;
one end of the actuator loading head 9 is connected with the actuator 13, and the other end of the actuator loading head is connected with the special-shaped column 15; thereby realizing loading of the special-shaped column structural member.
The displacement meter 26 is fixed on the upright post 25 connected with the pedestal 17;
the lower ends of the upright posts of the special-shaped column bodies 15 are arranged on column supports; the column support comprises a column shoe 4 and a column support bottom plate 5 connected with the column shoe 4;
a jack 14 is arranged below the rolling friction support 11;
the base of the jack 14 is contacted with the top end of the upright post 25 of the opposite column 15;
the top end of the jack 14 is in contact with the lower surface of the rolling friction support.
The portal beam is fixed on the pedestal 17; the column support is fixed to the pedestal 17.
The two ends of the upright post 25 are fixed, the upper end of the upright post is connected with the pressing beam, and the lower end of the upright post is connected with the pedestal; three displacement meters 26 are provided to collect the displacements at the top, in and at the foot of the profiled column 15, respectively.
As shown in figures 1, 2, 6 and 7,
the beam end fixing device of the special-shaped column body comprises a beam support base 6, a tension and compression sensor 8, a lower connector 18, an upper connector 21, a lower connecting and fastening screw 19, an upper connecting and fastening screw 20, an upper connecting plate 23 and a lower connecting plate 22;
the beam support base 6 is connected with the lower connector 18 through a hinge shaft I7;
the beam end is clamped by an upper connecting plate 23, a lower connecting plate 22 and four screws;
the upper connector 21 is connected with the lower connecting plate 22 through a hinge shaft I7;
the pulling and pressing sensor 8 is connected with the lower connector 18 and the upper connector 21 through a lower connecting and fastening screw 19 and an upper connecting and fastening screw 20;
the lower connecting fastening screw rod 19 and the upper connecting fastening screw rod 20 are respectively provided with a positive and a negative buckle so as to better adjust the tightness of the tension and compression sensor and avoid the stress of the front loading beam end;
as shown in figures 1, 8 and 10,
the rolling friction support 11 comprises a roller 30, a sliding plate 31 and a fixed plate 32;
the fixed plate 32 is connected with the pressing beam 3 through a screw rod;
the sliding plate 31 is hung on the fixed plate 32 through a bearing I33;
a cylindrical roller 30 is arranged between the sliding plate 31 and the fixed plate 32, and the sliding plate 31 can slide along with the special-shaped column 15 in the loading process.
The lateral supports are symmetrically fixed on the door frame post. The lateral support 12 is fixed to the mast by means of screws.
The square steel tube 27 in the lateral support 12 is welded with the inclined support 38, and the inclined support 38 is fixed on the left side portal 1 and the right side portal 2 by using screws;
the rolling bearing 34 of the lateral support front end is propped against the side edge of the special-shaped column 15;
the lateral support 12 includes a lateral adjustment assembly 29, a lateral stiffening plate 28, a square steel tube 27 and a diagonal brace 38.
The lateral reinforcing plates 28 are two 15mm thick iron plates, and serve to reinforce the strength and rigidity of the lateral support 12, provide a sufficient lateral support force for the shaped column 15, and prevent the shaped column 15 from rolling.
The lateral adjusting component 29 of the lateral support 12 consists of a bearing positioning plate 35, reinforcing steel bars 39 and a bearing II 34, the bearing II 34 is fixed through the bearing positioning plate 35, the bearing positioning plate 35 is connected with an adjusting long plate 40, two adjusting holes 37 are formed in the adjusting long plate 40, the whole set of adjusting component 29 can freely slide on the fixed long plate 36, and the extending amount is adjusted through the extension and retraction of the lateral adjusting component 29 so as to adapt to special-shaped columns of various sizes.
As shown in figures 1, 2, 3 and 11,
the actuator loading head 9 consists of a front steel plate 41, a rear steel plate 42, a connecting plate 43, a stiffening rib I45, a stiffening rib II 46 and 4 screws 46;
the thickness of the steel plate is 30mm, the diameter of the screw is 42mm,
the front steel plate 41 and the rear steel plate 42 are welded and connected through stiffening ribs 45 and 46, the front steel plate 41 is connected with the actuator 13, the rear steel plate 42 is connected with the connecting plate 43 through a screw 46, and the special-shaped column 15 is clamped so as to apply horizontal pushing force and pulling force through the actuator 13.
A method for testing an assembled special-shaped column of an assembled special-shaped column structure loading device comprises the following steps:
a. according to the design height of the special-shaped column 15, the position of the actuator 13 is adjusted to enable the actuator 13 and the loading end of the special-shaped column 15 to be at the same horizontal height; assembling the left side portal 1, the right side portal 2 and the pressing beam 3, and adjusting the position of the pressing beam 3 to ensure that the special-shaped column 15 is positioned right below the pressing beam 3, so as to avoid the bias condition; the rolling friction support 11 is installed, so that the rolling friction support 11 is fixed with the press beam 3, and the position of the rolling friction support 11 is adjusted, so that the rolling friction support 11 is coaxial with the centroid of the special-shaped column 13;
b. according to the design size of the special-shaped column 15, the positions of the pressed column, the column support base plate 5 and the beam support base 6 are adjusted, and the column support base plate 5 and the beam support base 6 are fixed on a pedestal by adopting screws; installing the column shoe 4, hoisting the special-shaped column 15, adjusting the adjusting nut 24 on the column shoe to enable the special-shaped column to reach a designated position, and screwing the adjusting nut 24 to fix the special-shaped column; the beam end fixing device of the special-shaped column body is installed, after the special-shaped column body is fastened, the tension and compression sensor 8 is connected with the beam support base 6 through the hinge shaft 7 and the fastening screw rod 19, and the fastening screw rods 19 and 20 are adjusted to enable the beam end to be in a smaller tensile stress state so as to ensure the stability of the special-shaped column body;
c. fixing the lateral support 12, and adjusting the adjusting component to enable the rolling bearing to prop against the side edge of the special-shaped column floor slab; assembling the special-shaped column body and the actuator connecting plate 43, and screwing the bolts to tightly connect the actuator 13 and the special-shaped column body 15 so as to provide horizontal load; a jack 14 at the top end of the special-shaped column is installed, so that the axis of the jack 14 is positioned at the position of the special-shaped column 15 to provide axial force of the special-shaped column 15; the displacement meter support upright posts 25 are fixed, and the positions of the three displacement meters 26 are adjusted to measure the displacement values at the tops, middle and middle column feet of the special-shaped column 15.
d. In the loading process, an axial force is firstly applied by the jack 14 to simulate the dead weight of the superstructure; the horizontal pushing force and the pulling force are applied by the actuator 13, the relative displacement of the top and the bottom of the special-shaped column 15 is measured by the displacement meter 26, and a force-displacement curve of the column top is obtained, so that a hysteresis curve and a skeleton curve of the special-shaped column are drawn, and the earthquake resistance and the energy consumption performance of the special-shaped column are reflected; the interlayer displacement angle of the special-shaped column body can be obtained through the displacement values of the column top, the column middle and the column foot, and the ductility coefficient of the special-shaped column body is calculated to evaluate the ductility performance of the special-shaped column body.
The above description is only of the preferred embodiment of the present invention, and is not intended to limit the structure of the present invention in any way. Any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention fall within the technical scope of the present invention.

Claims (1)

1. A loading test method of an assembled special-shaped column structure loading device, the assembled special-shaped column structure loading device comprises: the device comprises a left side portal (1), a right side portal (2), a pressing beam (3), a column support, a lateral support (12), an actuator loading head (9), a rolling friction support (11), a displacement meter (26) for collecting the displacement of a special-shaped column (15) and a beam end fixing device of the special-shaped column; the left side door frame (1) is parallel to the right side door frame (2); the door frame comprises a door frame beam and a door frame column; two ends of the pressing beam (3) are connected with the door frame beam through bolts; the upper surfaces of the two ends of the pressing beam (3) are attached to the lower surface of the door frame beam; the pressing beam (3) is perpendicular to the left side door frame and the right side door frame; the pressing beam (3) is positioned at the middle position of the left side door frame beam and the right side door frame beam;
a rolling friction support (11) is arranged below the pressing beam; one end of the actuator loading head (9) is connected with the actuator (13), and the other end is connected with the special-shaped column body (15); the displacement meter (26) is fixed on a stand column (25) connected with the pedestal (17); the lower end of the upright post of the special-shaped column body (15) is fixed on the column support; the column support comprises a column shoe (4) and a column support bottom plate (5) connected with the column shoe (4); a jack (14) is arranged below the rolling friction support (11); the base of the jack (14) is contacted with the top end of the upright post of the special-shaped column body (15); the top end of the jack (14) is contacted with the lower surface of the rolling friction support (11);
the door frame is fixed on the pedestal (17); the column support is fixed on the pedestal (17);
the two ends of the upright post (25) are fixed, the upper end of the upright post is connected with the pressing beam (3), and the lower end of the upright post is connected with the pedestal (17); three displacement meters (26) are arranged, and the displacement of the column top, the column middle and the column foot of the opposite column (15) is respectively collected;
the beam end fixing device of the special-shaped column body comprises a beam supporting base (6), a tension and compression sensor (8), upper and lower connecting joints (18, 21), upper and lower fastening screws (19, 20) and upper and lower connecting plates (23, 22);
the beam support base (6) is connected with the lower connector (18) through a hinge shaft I (7);
the beam end is clamped by an upper connecting plate (23) and a lower connecting plate (22) and four screws;
the upper connector (21) is connected with the lower connecting plate (22) through a hinge shaft I (7);
the pulling and pressing sensor (8) is connected with the upper and lower connectors (18, 21) through upper and lower connecting fastening screws (19, 20); the upper and lower connecting fastening screw rods (19, 20) are provided with positive and negative buckles;
the rolling friction support (11) comprises a roller (30), a sliding plate (31) and a fixed plate (32);
the fixed plate (32) is connected with the pressing beam (3) through a screw rod;
the sliding plate (31) is hung on the fixed plate (32) through a bearing I (33);
a cylindrical roller (30) is arranged between the sliding plate (31) and the fixed plate (32);
the square steel tube (27) in the lateral support (12) is welded with the inclined support (38), and the inclined support (38) is fixed on the left side portal (1) and the right side portal (2) by utilizing screws;
the rolling bearing at the front end of the lateral support is propped against the side edge of the special-shaped column body (15);
the lateral support (12) comprises a lateral adjusting assembly (29), a lateral reinforcing plate (28), a square steel tube (27) and an inclined support (38);
the lateral adjusting component (29) of the lateral support (12) consists of a bearing positioning plate (35), reinforcing steel bars (39) and a bearing (34), the bearing II (34) is fixed through the bearing positioning plate (35), the bearing positioning plate (35) is connected with an adjusting long plate (40), two adjusting holes (37) are formed in the adjusting long plate (40), the lateral adjusting component (29) freely slides on the fixed long plate (36), and the extension amount is adjusted through extension and contraction of the lateral adjusting component (29) so as to adapt to special-shaped columns with various sizes;
the actuator loading head (9) consists of a front steel plate (41), a rear steel plate (42), a connecting plate (43), stiffening ribs I (44), stiffening ribs II (45) and 4 screws (46);
the front steel plate (41) and the rear steel plate (42) are welded and connected through stiffening ribs (45, 46), the front steel plate (41) is connected with the actuator (13), the rear steel plate (42) is connected with the connecting plate (43) through a screw (46), and the special-shaped column (15) is clamped so as to apply horizontal pushing force and pulling force through the actuator (13);
the door frame column is formed by splicing two channel steel middle welded lacing plates, and a hole is formed in the middle of the channel steel and used for connecting a door frame beam;
the portal frame base is formed by welding steel plates, holes are symmetrically formed in two sides of the base, and the portal frame base is fixed on the pedestal through bolts;
the door frame beam is formed by welding steel plates, and two ends of the beam are provided with holes and are connected to the door frame column by bolts;
the loading test method is characterized by comprising the following steps of:
a. according to the design height of the special-shaped column body (15), the position of the actuator (13) is adjusted, so that the actuator (13) and the loading end of the special-shaped column body (15) are positioned at the same horizontal height; assembling a left side portal (1), a right side portal (2) and a pressing beam (3), and adjusting the position of the pressing beam (3) to enable the special-shaped column body (15) to be positioned right below the pressing beam (3); the rolling friction support (11) is installed, so that the rolling friction support (11) is fixed with the pressing beam (3), and the position of the rolling friction support (11) is adjusted, so that the rolling friction support (11) is coaxial with the centroid of the special-shaped column body (13);
b. according to the design size of the special-shaped column body (15), the positions of the column body, the column support base plate (5) and the beam support base (6) are adjusted, and the column support base plate (5) and the beam support base (6) are fixed on the pedestal by adopting screws; installing a column shoe (4), hoisting a special-shaped column body (15), adjusting an adjusting nut (24) on the column shoe to enable the special-shaped column body to reach a designated position, and tightening the adjusting nut (24) to fix the special-shaped column body; the beam end fixing device of the special-shaped column body is installed, after the special-shaped column body is fastened, the tension and compression sensor (8) is connected with the beam support base (6) through the hinge shaft I (7) and the fastening screws (19, 20), and the upper fastening screws and the lower fastening screws (19, 20) are adjusted to enable the beam end to be in a smaller tensile stress state so as to ensure the stability of the special-shaped column body;
c. fixing the lateral support (12), and adjusting the adjusting component (29) to enable the rolling bearing to prop against the side edge of the special-shaped column floor slab (47); assembling the special-shaped column body and an actuator connecting plate (43), and screwing a screw (46) to tightly connect the actuator (13) and the special-shaped column body (15) so as to provide horizontal load; a jack (14) at the top end of the special-shaped column is installed, so that the axle center of the jack (14) is positioned at the centroid position of the special-shaped column (15) to provide axial force of the special-shaped column (15); fixing a displacement meter supporting upright post (25) and adjusting the positions of three displacement meters (26) to measure displacement values at the top, middle and bottom of the special-shaped column (15);
d. in the loading process, axial force is firstly applied through a jack (14) so as to simulate the dead weight of the superstructure; applying horizontal pushing force and pulling force through an actuator (13), measuring the relative displacement of the top and the bottom of the special-shaped column (15) through a displacement meter (26), and obtaining a force-displacement curve of the column top so as to draw a hysteresis curve and a skeleton curve of the special-shaped column and reflect the earthquake resistance and the energy consumption performance of the special-shaped column; the interlayer displacement angle of the special-shaped column body can be obtained through the displacement values of the column top, the column middle and the column foot, and the ductility coefficient of the special-shaped column body can be calculated to evaluate the ductility performance of the special-shaped column body.
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