CN108956292B - Test device considering initial stress action of cross section of steel bridge deck plate welding seam - Google Patents
Test device considering initial stress action of cross section of steel bridge deck plate welding seam Download PDFInfo
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- CN108956292B CN108956292B CN201810651190.1A CN201810651190A CN108956292B CN 108956292 B CN108956292 B CN 108956292B CN 201810651190 A CN201810651190 A CN 201810651190A CN 108956292 B CN108956292 B CN 108956292B
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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
Abstract
The invention discloses a test device considering the initial stress action of a steel bridge deck plate welding seam cross section, which comprises: the device comprises an initial stress gear adjusting module, a crank slide block force transmission module, a spring pipe frame module and a rubber action head module; the initial stress gear adjusting module is fixedly connected with the crank slider force transmission module through a bearing, the crank slider force transmission module is connected with the spring tube frame module through a connecting rod, the connecting rod can linearly move on a notch of a sliding groove of a connecting plate of the spring tube frame module, and the rubber action head module is connected with the spring tube frame module through the connecting rod. According to the invention, the initial stress of the cross section of the welding seam is transferred through the rubber action head, so that the actual stress condition of the local area of the welding seam of the steel bridge panel under the action of the stay cable and the like can be better simulated, the test efficiency is obviously improved, and the test cost is reduced.
Description
Technical Field
The invention relates to the technical field of bridge structure fatigue test instruments, in particular to a test device considering the initial stress action of a steel bridge deck plate welding seam cross section.
Background
The orthotropic steel bridge deck is widely applied to the construction of a large-span cable bridge because of the advantages of light weight, high strength, large bending and torsional rigidity and the like. However, due to the arrangement of the longitudinal and transverse stiffening ribs and the welding residual stress inevitably caused by welding operation, the steel bridge deck is always subjected to fatigue damage, which brings adverse effects on the safety and the working performance of the bridge. As a typical steel bridge deck bridge system, axial stress caused by a stay cable of a cable-stayed bridge is transferred to a steel box girder through an anchoring area, so that the axial initial stress of a welding seam of the box girder cannot be ignored. At present, a large number of theoretical and experimental researches are carried out by domestic and foreign scholars aiming at the fatigue damage of the steel bridge deck. However, most of the current researches only consider the influence of the axial force of the stay cable on the fatigue performance of node parts such as a cable beam anchoring area. In the test, the steel box girder is only set as a boundary condition for simulating a real bridge, and the influence of the axial force on the fatigue performance of the steel bridge deck is not analyzed. The forces are actually transmitted from the stay cables to the anchoring area and are finally borne by the steel box girder. According to the saint-wennan principle, the stress concentration effect is not obvious at the moment, and when the influence of the axial direction of the stay cable on the fatigue performance of the steel box girder is considered, the stay cable is taken as a specific stress state of a bridge formation more often, and the stay cable is not taken as an influencing factor to be deeply considered.
At present, in order to simulate the fatigue damage of a steel bridge deck, an MTS servo hydraulic control system device and a vibration type fatigue test device are mostly used, the MTS servo hydraulic control system device is mainly applied to a steel bridge deck section model or other test pieces with larger sizes, and the test cost is higher. The fatigue test device is mainly suitable for the fatigue test of the steel bridge deck plate local model test piece, and is economical and economical. But both have difficulty in applying the initial weld cross-sectional stress directly on the test specimen.
Therefore, how to design a novel and economic test device capable of simulating the initial stress action of the cross section of the welding seam of the steel bridge deck becomes a technical problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a test device considering the initial stress action of the cross section of a welding seam of a steel bridge deck, which can obviously improve the test efficiency and reduce the test cost.
In order to solve the technical problem, the invention provides a test device considering the initial stress action of the cross section of a welding seam of a steel bridge deck, which comprises: the device comprises an initial stress gear adjusting module, a crank slide block force transmission module, a spring pipe frame module and a rubber action head module; the initial stress gear adjusting module is fixedly connected with the crank slider force transmission module through a bearing, the crank slider force transmission module is connected with the spring tube frame module through a connecting rod, the connecting rod can linearly move on a notch of a sliding groove of a connecting plate of the spring tube frame module, and the rubber action head module is connected with the spring tube frame module through the connecting rod.
Preferably, the lower end of the initial stress gear adjusting module is provided with two vertical gears, the two gears at the lower end are enabled to rotate by adjusting the rotary valve, and the four gears at the upper part are driven to rotate by the connecting rod, so that the crank sliding block force transmission modules at the two sides are driven to work.
Preferably, the gears at the upper end and the lower end of the initial stress gear adjusting module are adjusted by using connecting rods, the connecting rods are two sleeves drilled with cavities, and the length of each connecting rod is adjusted by using bolts.
Preferably, one end of the crank block force transmission module is fixedly connected with an outer side gear on the upper portion of the initial stress gear adjusting module through a bearing and rotates synchronously with the gear.
Preferably, the sliding groove in the crank sliding block force transmission module is provided with a ball, so that the sliding block can conveniently move linearly on the notch.
Preferably, the sliding groove rod in the crank sliding block force transmission module is provided with scales, and the size of the clamped load can be marked according to the expansion amount of the spring.
Preferably, the spring pipe frame module is fixedly connected with the crank sliding block force transmission module, and a connecting rod with the other end connected with the spring is arranged on the sliding block of the crank sliding block force transmission module and can control the spring to stretch.
Preferably, the spring central axis of the spring pipe frame module is provided with a protection rod to prevent the spring from generating excessive deformation.
Preferably, the rubber action head module is fixedly connected with the spring pipe frame module, and the horizontal position and the vertical position of the rubber action head can be adjusted through the adjusting bolt.
Preferably, the rubber action head module is internally provided with an electromagnet, and the working state of the rubber action head module can be controlled by a switch on the rubber action head module.
The invention has the beneficial effects that: the test device provided by the invention can better simulate the actual stress condition of the local area of the welding seam of the steel bridge panel under the action of the stay cable and the like by transmitting the initial stress of the cross section of the welding seam through the rubber action head, thereby obviously improving the test efficiency and reducing the test cost; the device can apply initial stress to a steel bridge deck local model test piece which needs to consider the initial stress of the cross section of the welding seam, and provides a feasible method for researching the stress performance of the steel bridge deck under systems such as a cable-stayed bridge and the like.
Drawings
Fig. 1 is a schematic structural diagram of the device.
Fig. 2 is an exploded view of the initial stress gear adjustment module.
FIG. 3 is a schematic view of an initial stress gear adjustment module.
Fig. 4 is an exploded view of an initial stress gear adjustment module adjustment lever.
FIG. 5 is a schematic view of the initial stress gear adjustment module upper gear drive.
Fig. 6 is an exploded view of the initial stress gear adjustment module upper gear drive.
Fig. 7 is a schematic view of a crank block force transfer module.
Fig. 8 is an exploded view of the crank block force transfer module.
Fig. 9 is a partially exploded view of the cooperating crank block force transfer module and spring housing module.
Fig. 10 is a schematic view of the dowel bars of the slider-crank force transfer module and the spring cradle module.
Fig. 11 is a disassembled view of the spring cage module.
Fig. 12 is a schematic view of a rubber action head module.
Fig. 13 is a schematic view of the disassembly of the rubber action head module.
FIG. 14 is a schematic view of a horizontal position adjustment portion of the rubber action head module of FIG. 1.
FIG. 15 is a schematic view of a horizontal position adjustment portion of the rubber action head module of FIG. 2.
FIG. 16 is a schematic view of the interior of a rubber action head module.
FIG. 17 is a schematic view showing the installation of the device for applying the test piece without bending moment initial stress.
FIG. 18 is a schematic view showing the installation of the apparatus for applying a test piece with an initial stress of bending moment.
Detailed Description
As shown in FIG. 1, the test device considering the initial stress action of the cross section of the welding seam of the steel bridge deck comprises: the device comprises an initial stress gear adjusting module, a crank slide block force transmission module, a spring pipe frame module and a rubber action head module; the initial stress gear adjusting module is fixedly connected with the crank slider force transmission module through a bearing, the crank slider force transmission module is connected with the spring tube frame module through a connecting rod, the connecting rod can linearly move on a notch of a sliding groove of a connecting plate of the spring tube frame module, and the rubber action head module is connected with the spring tube frame module through the connecting rod.
The lower end of the initial stress gear adjusting module is provided with two vertical gears, the two gears at the lower end are enabled to rotate by adjusting the rotary valve, and the four gears at the upper part are driven to rotate by the connecting rod, so that the crank slide block force transmission modules at two sides are driven to work. The gears at the upper end and the lower end of the initial stress gear adjusting module are adjusted by utilizing connecting rods, the connecting rods are two sleeves drilled with cavities, and the length of each connecting rod is adjusted through bolts.
One end of the crank sliding block force transmission module is fixedly connected with an outer side gear on the upper portion of the initial stress gear adjusting module through a bearing and rotates synchronously with the gear. The sliding groove in the crank sliding block force transmission module is provided with a ball, so that the sliding block can move linearly on the notch conveniently. The slide groove rod in the crank slide block force transmission module is provided with scales, and the size of the clamped load can be marked according to the expansion amount of the spring.
The spring pipe frame module is fixedly connected with the crank sliding block force transmission module, and a connecting rod with the other end connected with a spring is arranged on a sliding block of the crank sliding block force transmission module and can control the spring to stretch. And a protection rod is arranged on the spring central axis of the spring pipe frame module to prevent the spring from generating excessive deformation.
The rubber action head module is fixedly connected with the spring pipe frame module, and the horizontal and vertical positions of the rubber action head can be adjusted through the adjusting bolt. The rubber action head module is internally provided with an electromagnet, and the working state of the rubber action head module can be controlled by a switch on the rubber action head module.
Taking a top plate-U rib test piece as an example, as shown in fig. 17 and 18, the test device comprises a rotary valve part 1, a rotary valve 1a, a rotary valve and lower force transmission gear connecting rod 1b, a lower force transmission gear part 2, a lower force transmission gear 2a fixedly connected with the connecting rod 1b, a gear 2b perpendicular to the lower force transmission gear 2a, an initial stress gear adjusting module adjusting rod 3, an adjusting rod inner sleeve 3a, an adjusting rod outer sleeve 3b, an adjusting bolt 3c, upper force transmission gears 4a-4d, upper force transmission gear connecting rods 4f, 4h, upper force transmission gear fixing rods 4e, 4g, 4i, upper force transmission gear connecting rod fixing ends 4j-4q, a slider-crank module force transmission rod 5, a gear connecting transmission plate 5a, another transmission plate 5c, fixing rods 5e, 5f, 5g, fixed ends 5b, 5d, 5h, 5i and 5j, a slider-crank module 6, a slide bar end 6a, a slide bar end rod 6b, a slide groove rod 6c, a slide groove ball 6d, a connecting rod 6f, a push rod big end 6g, a slide groove rod scale 6h, a spring tube frame module 7, a spring base 7a, a push rod 7b, a push rod small end 7c, a spring 7d, a spring outer cover 7e, a spring base 7f, a rubber action head module 8, a slide groove plate 8a, a slide groove sheet 8b, a rubber action head shell 8c, an electromagnet switch 8d, fixed screws 8e and 8f, an electromagnet 8g, an extrusion rubber block 8h, a rubber head 8i and a nut 8 j.
As shown in fig. 12 to 18, the device mounting position (mainly, the position of the rubber action head) is determined according to the needs of the test, and the length of the fixing screw 8e and the position of the chute plate 8b are adjusted to be fixed to the chute plate 8a and the chute plate 8b, respectively, so that the surface of the rubber head 8i is tightly attached to the surface of the test piece. The rubber action head module 8 is adjusted to be fixed to the fixing screw 8 e. The electromagnet switch 8d is turned on to make the device adhere to the test piece.
As shown in fig. 1 to 6, according to the magnitude of the axial force required to be applied in the test, the rotary valve 1a is rotated to drive the lower force transmission gears 2a and 2b to rotate, and then the initial stress gear adjusting module adjusting rod 3 and the upper force transmission gear 4b are driven to rotate. At the same time, the upper force transmission gears 4a, 4c and 4d are driven to rotate.
As shown in fig. 7 to 11, the upper force transmission gears 4a and 4d adjust the position of the slide rod end 6a by driving the transmission plates 5a and 5c and pushing the push rod 7b to compress or extend the spring 7 d. And load data is read through the scales 6h on the sliding groove rod 6 c.
The test device provided by the invention can better simulate the actual stress condition of the local area of the welding seam of the steel bridge panel under the action of the stay cable and the like by transmitting the initial stress of the cross section of the welding seam through the rubber action head, thereby obviously improving the test efficiency and reducing the test cost; the device can apply initial stress to a steel bridge deck local model test piece which needs to consider the initial stress of the cross section of the welding seam, and provides a feasible method for researching the stress performance of the steel bridge deck under systems such as a cable-stayed bridge and the like.
Claims (8)
1. Consider test device of steel decking welding seam cross section initial stress effect, its characterized in that includes: the device comprises an initial stress gear adjusting module, a crank slide block force transmission module, a spring pipe frame module and a rubber action head module; the initial stress gear adjusting module is fixedly connected with the crank slider force transmission module by a bearing, the crank slider force transmission module is connected with the spring tube frame module through a connecting rod, the connecting rod moves linearly on a notch of a chute of a connecting plate of the spring tube frame module, and the rubber action head module is connected with the spring tube frame module through the connecting rod; the lower end of the initial stress gear adjusting module is provided with two vertical gears, the two gears at the lower end are enabled to rotate by adjusting a rotary valve, and the four gears at the upper part are driven to rotate by a connecting rod, so that the crank slide block force transmission modules at two sides are driven to work; the spring pipe frame module is fixedly connected with the crank sliding block force transmission module, and a connecting rod with the other end connected with the spring is arranged on the sliding block of the crank sliding block force transmission module to control the spring to stretch.
2. The test device for considering the initial stress action of the cross section of the welding seam of the steel bridge deck as claimed in claim 1, wherein the gears at the upper end and the lower end of the initial stress gear adjusting module are adjusted by using a connecting rod, the connecting rod is two sleeves drilled with cavities, and the length of the connecting rod is adjusted by using bolts.
3. The test device considering the initial stress action of the cross section of the welding seam of the steel bridge deck plate as claimed in claim 1, wherein one end of the crank block force transmission module is fixedly connected with an outer gear on the upper portion of the initial stress gear adjusting module through a bearing and rotates synchronously with the gear.
4. The test device for considering the initial stress action of the cross section of the welding seam of the steel bridge deck plate as claimed in claim 1, wherein the sliding groove in the crank block force transmission module is provided with a ball.
5. The test device considering the initial stress action of the cross section of the welding seam of the steel bridge deck slab as claimed in claim 1, wherein the slide way rod in the crank block force transmission module is provided with scales, and the size of the clamped load can be marked according to the expansion and contraction amount of the spring.
6. The test device for considering the initial stress action of the cross section of the welding seam of the steel bridge deck as claimed in claim 1, wherein a protection rod is arranged on the spring central axis of the spring pipe frame module.
7. The test device considering the initial stress action of the cross section of the weld joint of the steel bridge deck as claimed in claim 1, wherein the rubber action head module is fixedly connected with the spring tube frame module, and the horizontal and vertical positions of the rubber action head are adjusted by adjusting bolts.
8. The test device considering the initial stress action of the cross section of the weld joint of the steel bridge deck as claimed in claim 1, wherein the rubber action head module is internally provided with an electromagnet, and the working state of the rubber action head module is controlled by a switch on the rubber action head module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810651190.1A CN108956292B (en) | 2018-06-22 | 2018-06-22 | Test device considering initial stress action of cross section of steel bridge deck plate welding seam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810651190.1A CN108956292B (en) | 2018-06-22 | 2018-06-22 | Test device considering initial stress action of cross section of steel bridge deck plate welding seam |
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| CN108956292A CN108956292A (en) | 2018-12-07 |
| CN108956292B true CN108956292B (en) | 2020-08-25 |
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| CN201810651190.1A Active CN108956292B (en) | 2018-06-22 | 2018-06-22 | Test device considering initial stress action of cross section of steel bridge deck plate welding seam |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110686978B (en) * | 2019-10-22 | 2022-04-12 | 无锡公正试验检测有限公司 | Bridge inhaul cable stretching resonance detection device |
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| CN2572389Y (en) * | 2002-10-09 | 2003-09-10 | 同济大学 | Train running imitated structure fatigue test loading-frame |
| US7000484B2 (en) * | 2003-03-25 | 2006-02-21 | Kulite Semiconductor Products, Inc. | Load beam apparatus operative to prevent improper operation due to off axis loads |
| CN2784909Y (en) * | 2005-04-26 | 2006-05-31 | 李胜利 | Multifunctional combined experimental bench for mechanics of material |
| WO2012068037A3 (en) * | 2010-11-18 | 2012-07-19 | Honeywell International Inc. | System for monitoring structural assets |
| CN102650574A (en) * | 2011-08-19 | 2012-08-29 | 高速铁路建造技术国家工程实验室 | Dynamic load simulation device for high-speed railway |
| CN103163032A (en) * | 2013-03-29 | 2013-06-19 | 四川大学 | System and method for detecting fatigue strength of steel beam of corrugated steel web |
| CN203981518U (en) * | 2014-06-30 | 2014-12-03 | 长安大学 | The web clearance plane at the horizontal gusset plate of steel bridge place is out of shape fatigue test loading device outward |
| CN105445434A (en) * | 2015-12-22 | 2016-03-30 | 宝山钢铁股份有限公司 | Pipeline steel pipe on-site girth welding evaluation method |
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2018
- 2018-06-22 CN CN201810651190.1A patent/CN108956292B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2572389Y (en) * | 2002-10-09 | 2003-09-10 | 同济大学 | Train running imitated structure fatigue test loading-frame |
| US7000484B2 (en) * | 2003-03-25 | 2006-02-21 | Kulite Semiconductor Products, Inc. | Load beam apparatus operative to prevent improper operation due to off axis loads |
| CN2784909Y (en) * | 2005-04-26 | 2006-05-31 | 李胜利 | Multifunctional combined experimental bench for mechanics of material |
| WO2012068037A3 (en) * | 2010-11-18 | 2012-07-19 | Honeywell International Inc. | System for monitoring structural assets |
| CN102650574A (en) * | 2011-08-19 | 2012-08-29 | 高速铁路建造技术国家工程实验室 | Dynamic load simulation device for high-speed railway |
| CN103163032A (en) * | 2013-03-29 | 2013-06-19 | 四川大学 | System and method for detecting fatigue strength of steel beam of corrugated steel web |
| CN203981518U (en) * | 2014-06-30 | 2014-12-03 | 长安大学 | The web clearance plane at the horizontal gusset plate of steel bridge place is out of shape fatigue test loading device outward |
| CN105445434A (en) * | 2015-12-22 | 2016-03-30 | 宝山钢铁股份有限公司 | Pipeline steel pipe on-site girth welding evaluation method |
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| CN108956292A (en) | 2018-12-07 |
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