CN110389077B - Multi-beam concrete bending creep testing device and testing method - Google Patents
Multi-beam concrete bending creep testing device and testing method Download PDFInfo
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- CN110389077B CN110389077B CN201910591219.6A CN201910591219A CN110389077B CN 110389077 B CN110389077 B CN 110389077B CN 201910591219 A CN201910591219 A CN 201910591219A CN 110389077 B CN110389077 B CN 110389077B
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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
- G01N3/02—Details
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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
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- 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
- G01N2203/0023—Bending
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- 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
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
Abstract
The invention discloses a multi-beam concrete bending creep testing device, which comprises: hoisting device and trisection point creep loading appearance, trisection point creep loading appearance includes: the door-shaped steel bracket, door-shaped steel bracket surface middle part has two lower part supports, lower part concrete beam test piece has been placed to lower part support top, lower part concrete beam test piece surface both ends have the middle part support, upper portion concrete beam test piece has been placed to middle part support top, be provided with a plurality of amount of deflection testing arrangements between lower part concrete beam test piece and the upper portion concrete beam test piece, upper portion concrete beam test piece surface middle part has two upper portion supports, each upper portion support department hangs and is equipped with biography power piece, it extends to door-shaped steel bracket below to pass power piece, it is provided with the loading hanging flower basket to pass power piece position department below door-shaped steel bracket, solves the technical problem that can not accurately reflect the actual complicated stress state that bends of concrete structure among the prior art.
Description
Technical Field
The invention belongs to the field of building tests, and particularly relates to a multi-beam concrete bending creep test device and a test method.
Background
Creep is an inherent property of concrete itself, and is a slow deformation that occurs under a sustained load, significantly affecting the safety and durability of the structure.
At present, concrete creep research at home and abroad mainly refers to concrete uniaxial compression and tension creep, however, the two testing methods have obvious difference compared with the actual stress state of a concrete structure (a road, a bridge and the like). The pure uniaxial compression and tension can not reflect the actual complex flexural stress state of the concrete structure and can not accurately represent the creep behavior of the concrete structure in the flexural state. In order to reflect the creep behavior of concrete in the actual stress state more accurately, it is necessary to develop a creep test device and a test method capable of reflecting the concrete in the flexural state.
Disclosure of Invention
The invention aims to provide a multi-beam concrete bending creep testing device and a testing method, and solves the technical problem that the actual complex flexural stress state of a concrete structure cannot be accurately reflected in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a multi-beam concrete flexural creep test device, comprising: hoisting device and trisection point creep loading appearance, trisection point creep loading appearance includes: the door-shaped steel bracket, door-shaped steel bracket surface middle part has two lower part supports, two the lower part support is located door-shaped steel bracket length direction's trisection position department respectively, lower part concrete beam test piece has been placed to lower part support top, lower part concrete beam test piece surface both ends have the middle part support, upper portion concrete beam test piece has been placed to the middle part support top, be provided with a plurality of amount of deflection testing devices between lower part concrete beam test piece and the upper portion concrete beam test piece, upper portion concrete beam test piece surface middle part has two upper portion supports, two upper portion support position and two the lower part support position is corresponding, each upper portion support department hangs and is equipped with and passes power piece, it extends to door-shaped steel bracket below to pass power piece, it is provided with the loading hanging flower basket to pass power piece position department below the door-shaped steel bracket.
The invention relates to a multi-beam concrete bending creep testing device, which comprises a mobile portal frame and a chain block, wherein the mobile portal frame comprises: the top of each portal frame triangular support is provided with a portal beam in a spanning mode, and the chain block is arranged on the bottom surface of the portal beam.
According to the multi-beam concrete bending creep testing device, a plurality of universal wheels are arranged at the bottom of the triangular support of the portal frame.
The invention relates to a multi-beam concrete bending creep testing device, which is characterized in that a hoisting device is matched with a plurality of three-division-point creep loaders for use.
The invention relates to a multi-beam concrete bending creep testing device, which comprises a force transmission piece, wherein the force transmission piece comprises: the U-shaped force transmission piece body is provided with a force transmission shaft mounting hole at the top, a force transmission shaft penetrates through the force transmission shaft mounting hole, and the force transmission shaft is in contact with the upper support.
According to the multi-beam concrete bending creep testing device, the limiting rod mounting buckles are arranged on two sides of the middle of the U-shaped force transmission piece body and used for penetrating the limiting rods, when the limiting rods penetrate, the limiting rods are located on the top surface of the door-shaped steel bracket, and the limiting rods transmit the stress of the force transmission piece to the door-shaped steel bracket.
According to the multi-beam concrete bending creep testing device, the force transmission piece lifting lugs are arranged at the two tops of the U-shaped force transmission piece body.
The invention discloses a multi-beam concrete bending creep test device.
A multi-beam concrete bending creep test method comprises the following steps:
s1, placing the door-shaped steel bracket stably, connecting the two force transmission pieces with a loading hanging basket respectively, placing the two force transmission pieces below two tripartite positions respectively, and adding standard loading weights or weights into the loading hanging basket to a specified weight;
s2, moving the hoisting device to the position of the door-shaped steel bracket, hoisting the two force transfer pieces through the two chain hoists, enabling the two force transfer pieces to be respectively located at the three-part positions of the door-shaped steel bracket, inserting a limiting rod into a limiting rod mounting buckle when the position of the limiting rod mounting buckle is higher than the upper surface of the bracket beam in the hoisting process, and transmitting the stress of the force transfer piece to the bracket beam through the limiting rod;
s3, arranging two lower supports on the surface of the bracket beam, wherein the two lower supports are both positioned at the position of a trisection point;
s4, hoisting a lower concrete beam test piece by using a chain hoist, and placing the lower concrete beam test piece on the two lower supports, wherein the two lower supports are positioned at the three-division point of the lower concrete beam test piece;
s5, placing middle supports at two ends of the surface of the lower concrete beam test piece;
s6, hoisting the upper concrete beam test piece to the two middle supports by using a chain hoist, and aligning the upper concrete beam test piece and the lower concrete beam test piece;
s7, respectively arranging two upper supports at the position of a triple point on the surface of the upper concrete beam test piece, and arranging deflection testing devices in the middle and at two ends of a gap between the upper concrete beam test piece and the lower concrete beam test piece;
and S8, continuously lifting the two force transmission pieces by using the two chain hoists again, taking out the limiting rod, and slowly descending the force transmission pieces to realize loading after the force transmission shaft is placed on the surface of the upper support.
The invention has the following beneficial effects: the invention designs a multi-beam concrete bending creep testing device and a testing method, which can reflect the creep behavior of concrete under a bending complex stress state, can simultaneously perform two concrete beam test pieces, improve the testing efficiency, and are easy to manufacture and operate and high in use safety.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is an isometric view of an embodiment of the invention;
FIG. 2 is a three-point creep loader isometric view of an embodiment of the present invention;
FIG. 3 is a partial view of a lifting device according to an embodiment of the present invention;
FIG. 4 is a front view of a three-point creep loader of an embodiment of the present invention;
fig. 5 is a partial view of a force transmitting member according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1-5, a multi-beam concrete flexural creep test apparatus includes: a hoist 10 and a three-part creep loader 14, the three-part creep loader 14 comprising: the door-shaped steel bracket 2 is characterized in that the middle part of the surface of the door-shaped steel bracket 2 is provided with two lower supports 3, the two lower supports 3 are respectively positioned at the three-point position of the door-shaped steel bracket 2 in the length direction, a lower concrete beam test piece 4 is placed above the lower support 3, middle supports 5 are arranged at two ends of the surface of the lower concrete beam test piece 4, an upper concrete beam test piece 6 is placed above the middle support 5, a plurality of deflection testing devices 11 are arranged between the lower concrete beam test piece 4 and the upper concrete beam test piece 6, the middle part of the surface of the upper concrete beam test piece 6 is provided with two upper supports 7, the two upper supports 7 are respectively positioned at the three-way point of the upper concrete beam test piece 6 in the length direction, a force transmission piece 8 is hung at each upper support 7, the force transmission piece 8 extends to the lower portion of the door-shaped steel bracket 2, and a loading hanging basket 9 is arranged at the position, below the door-shaped steel bracket 2, of the force transmission piece 8.
In a preferred embodiment of the present invention, the hoisting device 10 includes a mobile gantry 1 and a chain block 13, and the mobile gantry 1 includes: the top of the two portal frame triangular supports 101 is spanned with a portal beam 102, and the chain block 13 is arranged on the bottom surface of the portal beam 102.
In the preferred embodiment of the present invention, the bottom of the gantry triangle 101 is provided with a plurality of universal wheels 12.
In a preferred embodiment of the present invention, the hoist 10 is used in conjunction with a plurality of three-point creep loaders 14.
In a preferred embodiment of the invention, said force-transmitting member 8 comprises: the U-shaped force transmission piece body 805 is provided with a force transmission shaft mounting hole 801 at the top, a force transmission shaft penetrates through the force transmission shaft mounting hole 801, and the force transmission shaft is in contact with the upper support.
In a preferred embodiment of the present invention, one side or both sides of the middle of the U-shaped force transmission member body 805 are provided with a limiting rod mounting buckle 803, the limiting rod mounting buckle 803 is used for penetrating a limiting rod, when the limiting rod is penetrated, the limiting rod is located on the top surface of the door-shaped steel bracket 2, and the limiting rod transmits the stress of the force transmission member 8 to the door-shaped steel bracket 2.
In the preferred embodiment of the present invention, the two tops of the U-shaped force transmission member body 805 are provided with force transmission member lifting lugs 804.
In the preferred embodiment of the present invention, the steel gantry bracket 2 comprises two bracket supports 202 and a bracket beam 201, and the bracket beam 201 is spanned on the tops of the two bracket supports 202.
A multi-beam concrete flexural creep test method comprises the following steps:
s1, placing the door-shaped steel bracket 2 stably, connecting the two force transmission pieces 8 with the loading hanging basket 9 respectively, placing the force transmission pieces below the two three-point positions respectively, and adding standard loading weights or weights to a specified weight in the loading hanging basket 9;
s2, moving the lifting device 10 to the position of the door-shaped steel bracket 2, lifting the two force transmission pieces 8 through the two chain hoists 13 to enable the two force transmission pieces 8 to be respectively located at the three-point position of the door-shaped steel bracket 2, inserting a limiting rod into the limiting rod mounting buckle 803 when the position of the limiting rod mounting buckle 803 is higher than the upper surface of the bracket beam 201 in the lifting process, and transmitting the stress of the force transmission pieces 8 to the bracket beam 201 through the limiting rod;
s3, arranging two lower supports 3 on the surface of the bracket beam 201, wherein the two lower supports 3 are both positioned at the position of a three-point;
s4, hoisting a lower concrete beam test piece 4 by using a chain hoist 13, and placing the lower concrete beam test piece on the two lower supports 3, wherein the two lower supports 3 are positioned at the three-part position of the lower concrete beam test piece 4;
s5, placing middle supports 5 at two ends of the surface of the lower concrete beam test piece 4;
s6, hoisting the upper concrete beam test piece 6 to the two middle supports 5 by using a chain hoist 13, so that the upper concrete beam test piece 6 is aligned with the lower concrete beam test piece 4;
s7, respectively arranging two upper supports 7 at the position of a triple point on the surface of the upper concrete beam test piece 6, and arranging deflection testing devices 11 at the middle part and two ends of a gap between the upper concrete beam test piece 6 and the lower concrete beam test piece 4;
and S8, continuously lifting the two force transmission pieces 8 by using the two chain hoists 13 again, taking out the limiting rods, and slowly descending the force transmission pieces 8 to place the force transmission shafts on the surface of the upper support 7 to realize loading.
The third point is two points randomly arranged in the length direction, the part is divided into three parts, the bending of the concrete beam test piece is ensured, and certainly, the third point and the second third point can be respectively arranged in one third and two thirds of the length direction, namely, the third point is averagely divided into three sections with the same length.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (3)
1. A multi-beam concrete bending creep test method is characterized in that the method adopts a multi-beam concrete bending creep test device for testing, and the multi-beam concrete bending creep test device comprises: a hoist (10) and a ternary point creep loader (14), the ternary point creep loader (14) comprising: the door-shaped steel bracket (2), the middle part of the surface of the door-shaped steel bracket (2) is provided with two lower supports (3), the two lower supports (3) are respectively positioned at the three-point position of the door-shaped steel bracket (2) in the length direction, a lower concrete beam test piece (4) is placed above the lower supports (3), middle supports (5) are arranged at the two ends of the surface of the lower concrete beam test piece (4), an upper concrete beam test piece (6) is placed above the middle supports (5), a plurality of deflection testing devices (11) are arranged between the lower concrete beam test piece (4) and the upper concrete beam test piece (6), the middle part of the surface of the upper concrete beam test piece (6) is provided with two upper supports (7), the two upper supports (7) are positioned corresponding to the two lower supports (3), and a force transfer piece (8) is hung at each upper support (7), the force transmission piece (8) extends to the position below the door-shaped steel bracket (2), and a loading hanging basket (9) is arranged at the position, below the door-shaped steel bracket (2), of the force transmission piece (8);
the force transmission piece (8) comprises a U-shaped force transmission piece body (805), a force transmission shaft mounting hole (801) is formed in the top of the U-shaped force transmission piece body (805), a force transmission shaft penetrates through the force transmission shaft mounting hole (801), and the force transmission shaft is in contact with the upper support;
limiting rod mounting buckles (803) are arranged on two sides of the middle of the U-shaped force transmission piece body (805), the limiting rod mounting buckles (803) are used for penetrating limiting rods, when the limiting rods penetrate, the limiting rods are located on the top surface of the door-shaped steel bracket (2), and the limiting rods transmit stress of the force transmission piece (8) to the door-shaped steel bracket (2);
hoisting device (10) are including removing portal frame (1) and chain calabash (13), remove portal frame (1) and include: the top parts of the two portal frame triangular supports (101) are spanned with a portal beam (102), and the chain hoist (13) is arranged on the bottom surface of the portal beam (102);
the bottom of the portal frame triangular support (101) is provided with a plurality of universal wheels (12);
the top parts of two branches of the U-shaped force transmission piece body (805) are provided with force transmission piece lifting lugs (804);
the multi-beam concrete bending creep test method comprises the following steps:
s1, placing the door-shaped steel bracket (2) stably, connecting the two force transmission pieces (8) with a loading hanging basket (9) respectively, placing the two force transmission pieces below two three-point positions respectively, and adding standard loading weights or weights to a specified weight in the loading hanging basket (9);
s2, moving the hoisting device (10) to the position of the door-shaped steel bracket (2), hoisting the two force transmission pieces (8) through the two chain hoists (13), enabling the two force transmission pieces (8) to be respectively located at the three-division-point position of the door-shaped steel bracket (2), inserting a limiting rod into the limiting rod mounting buckle (803) when the position of the limiting rod mounting buckle (803) is higher than the upper surface of the bracket beam (201) in the hoisting process, and transmitting the stress of the force transmission pieces (8) to the bracket beam (201) through the limiting rod;
s3, arranging two lower supports (3) on the surface of a bracket beam (201), wherein the two lower supports (3) are located at the position of a three-point;
s4, hoisting a lower concrete beam test piece (4) by using a chain hoist (13), and placing the lower concrete beam test piece on two lower supports (3), wherein the two lower supports (3) are positioned at the three-part point of the lower concrete beam test piece (4);
s5, placing middle supports (5) at two ends of the surface of the lower concrete beam test piece (4);
s6, lifting the upper concrete beam test piece (6) to the two middle supports (5) by using chain hoists (13) to align the upper concrete beam test piece (6) with the lower concrete beam test piece (4);
s7, respectively arranging two upper supports (7) at the position of a triple point on the surface of the upper concrete beam test piece (6), and arranging deflection testing devices (11) in the middle and at two ends of a gap between the upper concrete beam test piece (6) and the lower concrete beam test piece (4);
s8, continuously lifting the two force transmission pieces (8) by using the two chain hoists (13) again, taking out the limiting rod, slowly descending the force transmission pieces (8) and placing the force transmission shaft on the surface of the upper support (7) to realize loading.
2. The method of claim 1, wherein the hoist (10) is used in conjunction with a plurality of three-point creep loaders (14).
3. The multi-beam concrete flexural creep test method according to claim 1, wherein the door steel bracket (2) comprises two bracket supports (202) and a bracket beam (201), and the bracket beam (201) is spanned on the tops of the two bracket supports (202).
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