CN111380757A - Steel platform inner cylinder bracket-placed single-shear-wall pressure-bearing test frame and test method - Google Patents
Steel platform inner cylinder bracket-placed single-shear-wall pressure-bearing test frame and test method Download PDFInfo
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- CN111380757A CN111380757A CN202010216679.3A CN202010216679A CN111380757A CN 111380757 A CN111380757 A CN 111380757A CN 202010216679 A CN202010216679 A CN 202010216679A CN 111380757 A CN111380757 A CN 111380757A
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- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention provides a bearing test frame for a single shear wall with a bracket placed on an inner cylinder of a steel platform and a test method.
Description
Technical Field
The invention relates to a bearing test frame and a test method for a single shear wall for placing a corbel on an inner cylinder of a steel platform.
Background
The super high-rise building construction technology of China is ahead of the world, the height of the built Shanghai center reaches 632m, the building is the second high-rise building of the world, the top ten high-rise buildings of the world are ranked, half of China has monopolized, and at present, many famous super high-rise buildings in China are built, such as Beijing Chinese goblet, Wuhan greenbelt center, Hefeibang center and the like. The construction of the super high-rise building in China mainly adopts two technical systems, namely an integral steel platform system and a hydraulic creeping formwork system, wherein the integral steel platform is a super high-rise building construction technical system generally accepted by the building engineering field in China, and is fully practiced in important projects such as the eastern Mingzhu television station, Shanghai Jinmao building, global finance center, Shanghai center and the like, a relatively complete technical system is formed, and the integral steel platform system is, is and will be widely applied to the super high-rise building construction engineering in China.
In the construction of a core tube of a super high-rise building, the whole steel platform is generally lifted integrally by adopting a staged jacking method or a staged lifting method, and in the concrete pouring construction stage of the core tube, all construction loads of the whole steel platform and the upper part of the whole steel platform are transferred to a concrete structure of the core tube through a shelving bracket system at the bottom of an inner tube scaffold of the steel platform. At present, the research on the bearing capacity and the failure mode of the placing bracket and the local bearing position of the concrete is not fully developed, and no mature experimental research means and theoretical research results exist. Therefore, a test device and a matching method technical system thereof are needed to solve the problem of safety evaluation of a support system of the super high-rise building integral steel platform construction technology and can systematically research the characteristics of the integral steel platform system for placing the bracket and the local pressure-bearing structure of the super high-rise building core tube concrete structure.
Disclosure of Invention
The invention aims to provide a bearing test frame for placing a bracket single shear wall on an inner cylinder of a steel platform and a test method.
In order to solve the problems, the invention provides a bearing test stand for a steel platform inner cylinder and a single shear wall for placing a bracket, which comprises:
a base plate 1;
the single shear wall 2 is fixed on the bottom plate 1;
the shear wall 2 is positioned in a space surrounded by the counterforce frame system;
the platform system is provided with a placing bracket 9 extending out of one side of the platform system, and the placing bracket 9 is erected on the shear wall 2;
the bottom end of the loading system is connected with the platform system, the top end of the loading system is connected with the counterforce frame system, and the loading system is used for applying a downward axial force to the platform system;
and the control system is respectively connected with the loading system and the platform system and is used for respectively controlling the stretching of the shelving bracket 9 and the loading system.
Further, in the bearing test frame for the bracket-placed single shear wall in the steel platform inner cylinder, the shear wall 2 is provided with a bracket pin shell 11 or a groove-shaped space formed by the bracket pin shell 11, and the placed bracket 9 extends into the bracket pin shell 11 or the groove-shaped space.
Further, in the bearing test frame for the corbel placed single shear wall on the inner cylinder of the steel platform, the counterforce frame system comprises:
two bottom balance beams 3 embedded in the bottom plate 1;
two top balance beams 4;
the height is higher than four vertical steel columns 5 of the shear wall 2, the lower end of each vertical steel column 5 is connected with a bottom balance beam 3, the upper end of each vertical steel column 5 is connected with a top balance beam 4, the vertical steel columns 5 are arranged outside the structure of the shear wall 2, and the shear wall 2 is located in the middle eccentric position of the two groups of vertical steel columns 5.
Further, in the bearing test stand for the steel platform inner cylinder and the bracket single shear wall, the platform system comprises:
the platform comprises an L-shaped platform frame 8, wherein the L-shaped platform frame 8 is a rectangular frame formed by a plurality of H-shaped steel platform beams, a platform vertical frame 14 is a vertical part of the L-shaped platform frame 8, and an included angle formed between the platform vertical frame and a horizontal part of the L-shaped platform frame 8 is 90 degrees;
the shelf bracket 9 is a telescopic steel component, and the shelf bracket 9 is a telescopic steel component;
the bracket pushing oil cylinder 10 is a horizontally telescopic actuating device, and the rear end of the placing bracket 9 is connected with the bracket pushing oil cylinder 10;
the bracket fixing boots 12 are boot-shaped steel components with holes reserved in the middle parts, the bracket fixing boots 12 are fixed on the horizontal parts of the L-shaped platform frame 8, the placed brackets 9 penetrate through the holes reserved in the middle parts of the bracket fixing boots 12, and the bracket fixing boots 12 fix the freedom degrees of the placed brackets 9 in the left and right directions, so that the placed brackets 9 only do telescopic movement in the front and back directions under the action of the bracket pushing oil cylinders 10;
the gate-shaped support 13 is arranged in the middle of the L-shaped platform frame 8, the gate-shaped support 13 is a gate-shaped steel component, the gate-shaped support 13 is connected with the loading system, and an open space below the gate-shaped support 13 is used for placing the bracket pushing oil cylinder 10;
the guide pulleys 15 are slidable members provided with two pairs of roller groups, the number of the guide pulleys 15 is four, the guide pulleys 15 are fixed on the outer side of the platform vertical frame 14, and the guide pulleys 15 grasp two sides of the flange of the vertical steel column 5 and slide up and down along the vertical steel column 5.
Further, in the bearing test frame for placing the bracket single shear wall on the inner cylinder of the steel platform, the loading system comprises:
the hydraulic oil cylinder 6 is a vertical actuating device, and the rear end of the hydraulic oil cylinder 6 is fixed at the lower end of the top balance beam 4;
the device comprises an axial force sensor 7, wherein the axial force sensor 7 is used for monitoring the output axial force of a hydraulic oil cylinder 6, the front end of an expansion link of the hydraulic oil cylinder 6 is fixedly connected with the axial force sensor 7, and the axial force sensor 7 is connected with a door-shaped support 13.
Further, in the bearing test frame for placing the bracket single shear wall on the inner cylinder of the steel platform, the control system is used for controlling the axial force and the telescopic posture of the hydraulic oil cylinder 6 and the bracket pushing oil cylinder 10 and monitoring the axial force data of the axial force sensor 7.
Further, in the steel platform inner cylinder laying bracket single shear wall pressure-bearing test frame, the control system controls the hydraulic oil cylinder 6 to provide vertical force, the vertical force is transmitted to the platform frame 8 through the axial force sensor 7, the bracket fixing shoe 12 fixed on the L-shaped platform frame 8 transmits the vertical force to the laying bracket 9, the laying bracket 9 is in contact with the bracket pin shell 11 or the groove-shaped space, and finally the downward axial force provided by the hydraulic oil cylinder 6 is transmitted to the shear wall 2 structure.
According to another aspect of the invention, the invention further provides a bearing test method for the steel platform inner cylinder bracket-placed single shear wall, the bearing test frame for the steel platform inner cylinder bracket-placed single shear wall is adopted, and the method comprises the following steps:
firstly, integrally pouring a single shear wall 2 on a bottom plate 1 according to a structural design scheme to complete the construction of a counterforce frame system, installing a hydraulic oil cylinder 6 of a loading system at the lower end of a top balance beam 4 of the counterforce frame system, installing an axial force sensor 7 of the loading system at the lower end of a telescopic rod of the hydraulic oil cylinder 6 of the loading system, constructing a platform system on the bottom plate 1, clamping a guide pulley 15 at the back of an L-shaped platform frame 8 of the platform system on the flange of a vertical steel column 5 of the counterforce frame system, controlling a shelving bracket 9 of the platform system to be in a retraction state through a bracket jacking oil cylinder 10 of the platform system, and controlling the hydraulic oil cylinder 6 to extend the telescopic rod through a control system to firmly fix the axial force sensor 7 at the lower end of the hydraulic oil cylinder and a door-shaped support 13 of the platform system;
step two, controlling a hydraulic oil cylinder 6 of the loading system to synchronously contract a telescopic rod of the hydraulic oil cylinder through the control system, so that the L-shaped platform frame 8 is integrally lifted to the height of a bracket pin shell 11 or a groove-shaped space of the shear wall 2;
thirdly, controlling a bracket pushing oil cylinder 10 of the platform system to extend out to push a resting bracket 9 to extend out of a bracket fixing boot 12 for a preset distance through the control system and extend into a bracket pin shell 11 or a groove-shaped space on the shear wall 2;
fourthly, controlling a hydraulic oil cylinder 6 of the loading system to apply a downward axial force to the platform system through the control system;
step five, in the process of applying downward axial force, monitoring the magnitude of the downward axial force in real time through an axial force sensor 7, controlling the magnitude and the posture of the output axial force of a hydraulic oil cylinder 6, and simultaneously monitoring the deformation and the damage condition of the concrete structure near a bracket pin shell 11 or a groove-shaped space on the shear wall 2 in real time;
step six, continuously applying a downward axial force according to a test scheme, after the purpose of the test is achieved, controlling a hydraulic oil cylinder 6 of the loading system to reduce the vertical force axial force until the vertical contact force between the placed bracket 9 and a bracket pin shell 11 or a groove-shaped space is zero through the control system, and controlling the bracket pushing oil cylinder 10 to shrink through the control system so as to retract the placed bracket 9 into a bracket fixing boot 12; and controlling the hydraulic oil cylinder 6 to extend so as to lower the platform system onto the base plate 1 and form stable contact, and loosening the fixation of the axial force sensor 7 and the platform system until the test is finished.
Compared with the prior art, the device comprises the bottom plate, the shear wall, the reaction frame system, the platform system, the loading system and the control system, can be used for the pressure-bearing local strength test of the core tube reinforced concrete shear wall structure of the super high-rise building, and can perform safety evaluation on the support system of the whole steel platform construction technology of the super high-rise building.
Drawings
FIG. 1 is a schematic diagram of a steel platform inner cylinder bracket single shear wall bearing test stand according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a steel platform inner cylinder laying bracket single shear wall pressure-bearing test frame taking out of a shear wall 2 according to an embodiment of the invention;
FIG. 3 is a front view of a steel platform inner cylinder bracket single shear wall bearing test stand according to an embodiment of the invention;
FIG. 4 is a top view of a steel platform inner cylinder resting corbel single shear wall bearing test stand according to an embodiment of the invention;
FIG. 5 is an installation schematic diagram of a counterforce frame of a steel platform inner cylinder placing bracket single shear wall bearing test frame according to an embodiment of the invention;
FIG. 6 is a schematic diagram of a placing bracket 9 of a steel platform inner cylinder placing bracket single shear wall pressure-bearing test frame extending into a bracket pin housing 11 according to an embodiment of the invention;
FIG. 7 is a disassembled schematic view of a bracket placing system of a single shear wall bearing test stand for placing brackets on an inner cylinder of a steel platform according to an embodiment of the invention;
FIG. 8 is a schematic diagram of a guide pulley 15 of a steel platform inner cylinder resting bracket single shear wall bearing test frame according to an embodiment of the invention;
fig. 9 is a schematic diagram of a force transmission platform frame 8 of a steel platform inner cylinder placing bracket single shear wall pressure-bearing test rack of an embodiment of the invention on a bottom plate 1;
fig. 10 is a schematic diagram of the force transfer platform frame 8 of the steel platform inner cylinder resting bracket single shear wall pressure-bearing test rack lifted to the test position according to the embodiment of the invention.
Wherein, 1-a bottom plate; 2-shear walls; 3-bottom balance beam; 4-top balance beam; 5-vertical steel columns; 6-a hydraulic oil cylinder; 7-an axial force sensor; 8-a platform frame; 9-laying the bracket; 10-a bracket pushing oil cylinder; 11-bracket pin housing; 12-a corbel boot; 13-a gantry type support; 14-a balancing frame; 15-guide pulley.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1 to 10, the invention provides a bearing test stand for a steel platform inner cylinder placed bracket single shear wall, which comprises:
a base plate 1;
the single shear wall 2 is fixed on the bottom plate 1;
the shear wall 2 is positioned in a space surrounded by the counterforce frame system;
the platform system is provided with a placing bracket 9 extending out of one side of the platform system, and the placing bracket 9 is erected on the shear wall 2;
the bottom end of the loading system is connected with the platform system, the top end of the loading system is connected with the counterforce frame system, and the loading system is used for applying a downward axial force to the platform system;
and the control system is respectively connected with the loading system and the platform system and is used for respectively controlling the stretching of the shelving bracket 9 and the loading system.
The bottom plate 1 is a rectangular reinforced concrete structural slab-shaped member, a bottom balance beam 3 is embedded in the bottom plate 1, and the bottom plate 1 is connected with the shear wall 2 into a whole to play a role in supporting the shear wall 2 and provide stable support for the whole test frame.
The device comprises a bottom plate, a shear wall, a counterforce frame system, a platform system, a loading system and a control system, can be used for a pressure-bearing local strength test of a core tube reinforced concrete shear wall structure of a super high-rise building, and can perform safety evaluation on a support system of the whole steel platform construction technology of the super high-rise building.
As shown in fig. 1 to 10, in an embodiment of the single shear wall pressure-bearing test stand for placing the corbel in the inner cylinder of the steel platform, a corbel pin housing 11 or a groove-shaped space formed by the corbel pin housing 11 is arranged on the shear wall 2, and the placing corbel 9 extends into the corbel pin housing 11 or the groove-shaped space.
The bracket pin shell 11 is installed together with a template before the shear wall 2 is poured, the template is used as a mold when the shear wall 2 is used for concrete integral pouring construction, after the shear wall 2 is integrally poured and concrete forms strength, the template is firstly removed, the bracket pin shell 11 can be left on the shear wall 2, the bracket pin shell 11 can be taken down, and a groove-shaped space for placing the bracket 9 to extend into is formed on the shear wall 2;
if the bracket pin shell 11 is left on the shear wall 2, the placing bracket 9 is placed on the bracket pin shell 11, and the vertical load of the placing bracket 9 is indirectly transmitted to the structure of the shear wall 2 through the bracket pin shell 11;
if the bracket pin shell 11 is not left on the shear wall 2, the bracket 9 is directly placed on the concrete structure of the shear wall 2, and the vertical load is directly transmitted to the structure of the shear wall 2.
The shear wall 2 is an integrally cast-in-place super high-rise building core tube shear wall structure, a bracket pin shell 11 is arranged on the shear wall 2, the structural form of the shear wall 2 is determined according to the design scheme of the core tube structure, the shear wall can be of an integrally cast reinforced concrete structure or an integrally cast reinforced concrete structure, the shear wall 2 is positioned at the upper part of the bottom plate 1, and the side surface of the shear wall 2 is provided with the bracket pin shell 11; the bracket pin shell 11 is a steel shell structure for placing the bracket 9, and the installation height of the bracket pin shell 11 is determined according to a test design scheme.
As shown in fig. 1 to 10, in an embodiment of the single shear wall pressure-bearing test stand for placing a corbel on an inner cylinder of a steel platform, the counterforce frame system includes:
two bottom balance beams 3 embedded in the bottom plate 1;
two top balance beams 4;
the height is higher than four vertical steel columns 5 of the shear wall 2, the lower end of each vertical steel column 5 is connected with a bottom balance beam 3, the upper end of each vertical steel column 5 is connected with a top balance beam 4, the vertical steel columns 5 are arranged outside the structure of the shear wall 2, and the shear wall 2 is located in the middle eccentric position of the two groups of vertical steel columns 5.
The reaction frame is a self-balancing system for providing test reaction and consists of a bottom balance beam 3, a top balance beam 4 and a vertical steel column 5; the bottom balance beam 3 is two H-shaped steel components, and the bottom balance beam 3 is embedded in the bottom plate 1; the top balance beam 4 is a frame formed by welding two H-shaped steel main beams and four H-shaped steel secondary beams, and is horizontally and transversely arranged above the whole device, and the length of the top balance beam 4 is the same as that of the bottom balance beam 3; the vertical steel columns 5 are four H-shaped steel components and are vertically arranged on the bottom plate 1, the height of each vertical steel column 5 is higher than that of the shear wall 2, the lower end of each vertical steel column 5 is connected with a bottom balance beam 3, and the upper end of each vertical steel column 5 is connected with a top balance beam 4, so that a vertical rectangular frame structure is formed; the vertical steel columns 5 are arranged outside the structure of the shear wall 2, the shear wall 2 is located at the eccentric position between the two groups of vertical steel columns 5, and the specific position is determined according to a test scheme.
As shown in fig. 1 to 10, in an embodiment of the single shear wall pressure-bearing test stand for placing a corbel on an inner cylinder of a steel platform, the platform system includes:
the platform comprises an L-shaped platform frame 8, wherein the L-shaped platform frame 8 is a rectangular frame formed by a plurality of H-shaped steel platform beams, a platform vertical frame 14 is a vertical part of the L-shaped platform frame 8, and an included angle formed between the platform vertical frame and a horizontal part of the L-shaped platform frame 8 is 90 degrees;
the shelf bracket 9 is a telescopic steel component, and the shelf bracket 9 is a telescopic steel component;
the bracket pushing oil cylinder 10 is a horizontally telescopic actuating device, and the rear end of the placing bracket 9 is connected with the bracket pushing oil cylinder 10;
the bracket fixing boots 12 are boot-shaped steel components with holes reserved in the middle parts, the bracket fixing boots 12 are fixed on the horizontal parts of the L-shaped platform frame 8, the placed brackets 9 penetrate through the holes reserved in the middle parts of the bracket fixing boots 12, and the bracket fixing boots 12 fix the freedom degrees of the placed brackets 9 in the left and right directions, so that the placed brackets 9 only do telescopic movement in the front and back directions under the action of the bracket pushing oil cylinders 10;
the gate-shaped support 13 is arranged in the middle of the L-shaped platform frame 8, the gate-shaped support 13 is a gate-shaped steel component, the gate-shaped support 13 is connected with the loading system, and an open space below the gate-shaped support 13 is used for placing the bracket pushing oil cylinder 10;
the guide pulleys 15 are slidable members provided with two pairs of roller groups, the number of the guide pulleys 15 is four, the guide pulleys 15 are fixed on the outer side of the platform vertical frame 14, and the guide pulleys 15 grasp two sides of the flange of the vertical steel column 5 and slide up and down along the vertical steel column 5.
The platform system consists of an L-shaped platform frame 8, a bracket 9, a bracket pushing oil cylinder 10, a bracket fixing shoe 12, a door-shaped bracket 13 and a guide pulley 15; the L-shaped platform frame 8 is an L-shaped rectangular frame which is formed by a plurality of H-shaped steels and has larger rigidity, the platform vertical frame 14 is a vertical part of the L-shaped platform frame 8, the included angle between the platform vertical frame and the horizontal part of the L-shaped platform frame 8 is 90 degrees, the number of the guide pulleys 15 is four, the guide pulleys are slidable members provided with two pairs of roller groups, the guide pulleys are fixed on the outer side of the platform vertical frame 14, the guide pulleys 15 can grasp the two sides of the flange edge of the vertical steel column 5 to play a role in restraining the L-shaped platform frame 8, so that the whole L-shaped platform frame 8 only has the freedom degree of vertical movement, and the whole L-shaped platform frame 8 is ensured not; the shelf bracket 9 is a telescopic steel component, the bracket pushing oil cylinder 10 is a horizontally telescopic actuating device, the rear end of the shelf bracket 9 is connected with the bracket pushing oil cylinder 10, the telescopic action of the shelf bracket is controlled by the bracket pushing oil cylinder 10, the bracket fixing boot 12 is a boot-shaped steel component with a hole in the middle part and is fixed on the horizontal part of the L-shaped platform frame 8, the shelf bracket 9 passes through the hole in the middle part of the bracket fixing boot 12, the bracket fixing boot 12 fixes the freedom degree of the shelf bracket 9 in the left and right directions, so that the shelf bracket 9 can only do telescopic motion under the action of the bracket pushing oil cylinder 10, and the shelf bracket 9 extends into a bracket pin shell 11 on the shear wall 2; the door-shaped support 13 is a door-shaped steel component, an open space below the door-shaped support is used for placing a bracket pushing oil cylinder 10, the door-shaped support 13 is installed in the middle of the L-shaped platform frame 8 and used for being connected with the axial force sensor 7, and vertical load provided by the hydraulic oil cylinder 6 is transmitted to the L-shaped platform frame 8 through the door-shaped support 13.
As shown in fig. 1 to 10, in an embodiment of the single shear wall pressure-bearing test rack for placing a corbel on an inner cylinder of a steel platform, the loading system includes:
the hydraulic oil cylinder 6 is a vertical actuating device, and the rear end of the hydraulic oil cylinder 6 is fixed at the lower end of the top balance beam 4;
the device comprises an axial force sensor 7, wherein the axial force sensor 7 is used for monitoring the output axial force of a hydraulic oil cylinder 6, the front end of an expansion link of the hydraulic oil cylinder 6 is fixedly connected with the axial force sensor 7, and the axial force sensor 7 is connected with a door-shaped support 13.
The loading system consists of a hydraulic oil cylinder 6 and an axial force sensor 7; the hydraulic oil cylinder 6 is a vertical actuating device which can be accurately controlled, has vertical telescopic freedom degree and can provide vertical axial force, the rear end of the hydraulic oil cylinder 6 is fixed at the lower end of the top balance beam 4, and the front end of the telescopic rod of the hydraulic oil cylinder 6 is connected and fixed with the axial force sensor 7; the axial force sensor 7 is used for monitoring the output axial force of the hydraulic oil cylinder 6, and the axial force sensor 7 is positioned at the front end of the hydraulic oil cylinder 6 and is connected with an expansion link of the hydraulic oil cylinder 6 and the door-shaped support 13.
As shown in fig. 1 to 10, in an embodiment of the steel platform inner cylinder bracket single shear wall bearing test frame of the invention, the control system is used for controlling the axial force and the telescopic posture of the hydraulic cylinder 6 and the bracket pushing cylinder 10, and monitoring the axial force data of the axial force sensor 7.
The control system is an electronic system for accurately controlling the axial force and the telescopic posture of the hydraulic oil cylinder 6 and the bracket pushing oil cylinder 10, and the control system can also monitor axial force data through the axial force sensor 7.
As shown in fig. 1 to 10, in an embodiment of the single shear wall pressure-bearing test stand for placing the corbel on the inner cylinder of the steel platform, the control system controls the hydraulic cylinder 6 to provide a vertical force, the vertical force is transmitted to the platform frame 8 through the axial force sensor 7, the corbel fixing shoe 12 fixed on the L-shaped platform frame 8 transmits the vertical force to the placing corbel 9, the placing corbel 9 is in contact with the corbel pin housing 11 or the groove-shaped space, and finally the downward axial force provided by the hydraulic cylinder 6 is transmitted to the shear wall 2 structure.
Under the control of a control system, vertical force provided by the hydraulic oil cylinder 6 is transmitted to the L-shaped platform frame 8 through the axial force sensor 7 and the door-shaped support 13, the bracket fixing boots 12 fixed on the L-shaped platform frame 8 transmit the vertical force to the resting bracket 9, the resting bracket 9 is in contact with the bracket pin shell 11 or the groove-shaped space, and finally the vertical force provided by the hydraulic oil cylinder 6 is transmitted to the shear wall 2 structure.
As shown in fig. 1 to 10, the invention further provides a pressure-bearing test method for the steel platform inner cylinder bracket-placed single shear wall, and the pressure-bearing test frame for the steel platform inner cylinder bracket-placed single shear wall provided by any one of the embodiments is adopted, and the method includes:
step one, test preparation: the monolithic shear wall 2 is integrally cast on the bottom plate 1 according to a structural design scheme, and a subsequent test can be performed after the concrete structure of the shear wall 2 reaches the design strength; completing construction of a counter-force frame system, installing a hydraulic oil cylinder 6 of a loading system at the lower end of a top balance beam 4 of the counter-force frame system, installing an axial force sensor 7 of the loading system at the lower end of a telescopic rod of the hydraulic oil cylinder 6 of the loading system, constructing the platform system on a bottom plate 1, clamping a guide pulley 15 at the back of an L-shaped platform frame 8 of the platform system on a flange of a vertical steel column 5 of the counter-force frame system, controlling a resting bracket 9 of the platform system to be in a retraction state through a bracket pushing oil cylinder 10 of the platform system, and controlling the hydraulic oil cylinder 6 to extend the telescopic rod through a control system so that the axial force sensor 7 at the lower end of the hydraulic oil cylinder is firmly fixed with a door-shaped support 13 of the platform system;
step two, lifting the platform frame 8: the control system controls the hydraulic oil cylinder 6 of the loading system to synchronously contract the telescopic rod of the loading system, so that the L-shaped platform frame 8 is integrally lifted to the height of the bracket pin shell 11 or the groove-shaped space of the shear wall 2;
step three, placing the bracket 9 to stretch out: the control system controls a bracket pushing oil cylinder 10 of the platform system to extend out to push a resting bracket 9 to extend out of a bracket fixing boot 12 for a preset distance and extend into a bracket pin shell 11 or a groove-shaped space on the shear wall 2 structure;
step four, vertical loading and deformation monitoring: the hydraulic oil cylinder 6 of the loading system is controlled by the control system to apply downward axial force to the platform system, the magnitude of the axial force is determined according to the actual load of the whole steel platform, and the increasing rate and the loading time of the axial force are determined according to a test design scheme;
step five, test monitoring: in the process of applying downward axial force, the magnitude of the downward axial force is monitored in real time through the axial force sensor 7, the magnitude and the posture of the output axial force of the hydraulic oil cylinder 6 are controlled accordingly, and meanwhile, the deformation and the damage conditions of the concrete structure near the bracket pin shell 11 or the groove-shaped space on the shear wall 2 are monitored in real time;
step six, finishing the test: continuously applying a downward axial force according to a test scheme, after the purpose of the test is achieved, controlling a hydraulic oil cylinder 6 of the loading system to reduce a vertical force axial force until a vertical contact force between a placed bracket 9 and a bracket pin shell 11 or a groove-shaped space is zero through the control system, and controlling the bracket pushing oil cylinder 10 to contract through the control system so as to retract the placed bracket 9 into a bracket fixing boot 12; and controlling the hydraulic oil cylinder 6 to extend so as to lower the platform system onto the base plate 1 and form stable contact, and loosening the fixation of the axial force sensor 7 and the platform system until the test is finished.
Specifically, as shown in fig. 1 to 10, the steel platform inner cylinder placing bracket single shear wall pressure-bearing test frame of the embodiment is composed of a bottom plate 1, a shear wall 2, a counter-force frame, a platform system, a loading system and a control system.
The base plate 1 of the present embodiment is a rectangular reinforced concrete structural slab member having a length of 10m and a width of 7.5 m.
The shear wall 2 of the embodiment is an integrally cast-in-place super high-rise building core tube shear wall structure with the thickness of 0.6m and the height of 3.5m, the structural form of the shear wall 2 is an integrally cast reinforced concrete structure, two shear walls 2 with the same specification are positioned at the eccentric position of the upper part of the bottom plate 1, and the side surfaces of the shear walls 2 are provided with bracket pin shells 11 with the height of 1.3 m.
The reaction frame of this embodiment is composed of a bottom balance beam 3, a top balance beam 4, and vertical steel columns 5. The bottom balance beam 3 is two H-shaped steel components with the length of 7.4m, and the bottom balance beam 3 is embedded in the bottom plate 1. The top balance beam 4 is a frame formed by welding a main beam of H-shaped steel with a beam root of 7.4m in length and four oblique beams of H-shaped steel with a length of 2.2 m. The vertical steel columns 5 are four H-shaped steel components with the height of 4.8m and are vertically arranged on the bottom plate 1.
The platform system of the embodiment is composed of a platform frame 8, a placing bracket 9, a bracket pushing cylinder 10 and a bracket fixing boot 12. The L-shaped platform frame 8 is 1.6m long, 1.4m wide and 1.6m high, the bracket 9, the bracket pushing cylinder 10, the bracket pin shell 11 and the bracket fixing boot 12 are made in the shape shown in figure 6, the extending distance of the bracket 9 is 0.25m, the overlapping length of the bracket pin shell 11 is 0.13m, and stable support can be provided.
The loading system of the embodiment comprises a hydraulic oil cylinder 6 and an axial force sensor 7. The maximum axial force provided by the two hydraulic oil cylinders 6 is 150t, the maximum total vertical force provided by the two hydraulic oil cylinders is 600t, and the loading capacity is larger than the actual maximum gravity load of the integral steel platform.
The bracket pin shell 11 is left on the shear wall 2, the bracket 9 is placed on the bracket pin shell 11 in the test, and the vertical load of the placed bracket 9 is indirectly transmitted to the structure of the shear wall 2 through the bracket pin shell 11.
The embodiment is mainly used for the test of the pressure-bearing local strength of the core tube reinforced concrete shear wall structure of the super high-rise building, and the test method comprises six steps:
step one, test preparation: the integral casting of the shear wall 2 is completed on the bottom plate 1 according to the structural design scheme, and after the strength of the concrete structure reaches 70% of the design strength, a subsequent test is carried out; completing the construction of a counterforce frame, and firmly overlapping the platform system and the loading system;
step two, lifting the platform frame 8: the telescopic rods of the two hydraulic oil cylinders 6 are synchronously contracted through the control system, so that the platform frame 8 is integrally lifted by 1.3m to reach the height of the bracket pin shell 11;
step three, placing the bracket 9 to stretch out: the bracket pushing oil cylinder 10 is controlled by the control system to extend out to push the placing bracket 9 to extend out 0.25m from the bracket fixing boot 12 and extend into a bracket pin shell 11 on the shear wall 2 structure, and the overlapping depth of the bracket pushing oil cylinder and the bracket pin shell is 0.13 m;
step four, vertical loading and deformation monitoring: the control system controls the two hydraulic oil cylinders 6 of the loading system to apply downward axial force to the platform system, the magnitude of the axial force is 50t, the total vertical load is 200t, under the condition of simulating normal use, the whole steel platform system transmits the vertical load to the resting bracket 9, and the increasing rate of the axial force is 5 t/min;
step five, test monitoring: the method comprises the following steps that while a vertical load is applied, the magnitude of a vertical axial force is monitored in real time through an axial force sensor 7, and meanwhile, the deformation and damage conditions of a concrete structure near a bracket pin shell 11 on a shear wall 2 are monitored in real time through a high-definition camera and an image analysis system;
step six, finishing the test: after continuously loading for 6 hours according to the test scheme, controlling two hydraulic oil cylinders 6 of the loading system to reduce the vertical force axial force until the vertical contact force between the resting bracket 9 and the bracket pin shell 11 is zero by the control system, controlling the bracket pushing oil cylinder 10 to shrink by the control system, and retracting the resting bracket 9 into the bracket fixing boot 12; and (3) controlling the hydraulic oil cylinder 6 to extend, lowering the platform system onto the base plate 1 to form stable contact, and loosening the fixation of the axial force sensor 7 and the platform system until the test is finished.
With reference to the description of the embodiment and fig. 1 to 10, scientific research technicians in the field can complete the construction of the test stand device and smoothly perform a local pressure-bearing test.
Compared with the prior art, the invention has the following beneficial effects:
1. the real loading condition can be reproduced: the platform system of the invention is completely consistent with the integral steel platform by using the bottom platform beam, and the vertical load provided by the loading system can be completely consistent with the gravity load of the integral steel platform, so the invention can locally reproduce the formal loading working condition of the integral steel platform system.
2. The test capability is strong, and the monitoring data is more: the loading system of the test rack device can apply vertical force larger than the actual gravity load of the steel platform, can test the limit bearing performance of the placing bracket 9 structure and the pressure-bearing part of the shear wall 2, can apply uneven load and can apply load repeatedly, can test the vertical load combination under the complex working condition, and has strong test capability; the loading system of the test rack device provided by the invention can be provided with various sensors, can measure the deformation and stress of the platform frame 8, the resting bracket 9, the bracket fixing boot 12 and the like, and can also monitor the local deformation and damage conditions of the shear wall 2 under the action of load.
3. Convenient reuse: the loading system of the test frame device can be repeatedly used, after one-time test is completed, the shear wall 2 structure is dismantled, and a new shear wall 2 structure can be poured again according to different design schemes, so that the local bearing capacity and the damage form of the shear wall 2 structures in different structural forms can be tested.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
It will be apparent to those skilled in the art that various changes and modifications may be made in the invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. The utility model provides a bracket list shear force wall pressure-bearing test frame is shelved to steel platform inner tube which characterized in that includes:
a base plate (1);
the single shear wall (2) is fixed on the bottom plate (1);
the shear wall (2) is positioned in a space surrounded by the counterforce frame system;
the platform system is provided with a placing bracket (9) extending out from one side, and the placing bracket (9) is erected on the shear wall (2);
the bottom end of the loading system is connected with the platform system, the top end of the loading system is connected with the counterforce frame system, and the loading system is used for applying a downward axial force to the platform system;
and the control system is respectively connected with the loading system and the platform system and is used for respectively controlling the stretching of the shelving bracket (9) and the loading system.
2. The steel platform inner cylinder resting bracket single shear wall bearing test frame according to claim 1, characterized in that the shear wall (2) is provided with a bracket pin housing (11) or a groove-shaped space formed by the bracket pin housing (11), and the resting bracket (9) extends into the bracket pin housing (11) or the groove-shaped space.
3. The steel platform inner cylinder put bracket single shear wall bearing test stand of claim 2, wherein the counterforce frame system comprises:
two bottom balance beams (3) embedded in the bottom plate (1);
two top balance beams (4);
the height is higher than four vertical steel columns (5) of the shear wall (2), a bottom balance beam (3) is connected to the lower end of each vertical steel column (5), a top balance beam (4) is connected to the upper end of each vertical steel column (5), the vertical steel columns (5) are arranged outside the structure of the shear wall (2), and the shear wall (2) is located in the middle of two groups of vertical steel columns (5) in an eccentric position.
4. The steel platform inner cylinder put bracket single shear wall bearing test stand of claim 3, wherein the platform system comprises:
the platform comprises an L-shaped platform frame (8), wherein the L-shaped platform frame (8) is a rectangular frame formed by a plurality of H-shaped steel platform beams, a platform vertical frame (14) is a vertical part of the L-shaped platform frame (8), and an included angle formed between the platform vertical frame and a horizontal part of the L-shaped platform frame (8) is 90 degrees;
the resting corbel (9), wherein the resting corbel (9) is a telescopic steel component;
the bracket pushing oil cylinder (10), the bracket pushing oil cylinder (10) is a horizontally telescopic actuating device, and the rear end of the placing bracket (9) is connected with the bracket pushing oil cylinder (10);
the bracket fixing boots (12) are boot-shaped steel components with holes reserved in the middle parts and are fixed on the horizontal parts of the L-shaped platform frames (8), the placed brackets (9) penetrate through the holes reserved in the middle parts of the bracket fixing boots (12), and the bracket fixing boots (12) are used for fixing the freedom degrees of the placed brackets (9) in the left and right directions, so that the placed brackets (9) only do telescopic motion in the front and back directions under the action of the bracket pushing oil cylinders (10);
the gate-shaped support (13) is arranged in the middle of the L-shaped platform frame (8), the gate-shaped support (13) is a gate-shaped steel component, the gate-shaped support (13) is connected with the loading system, and an open space below the gate-shaped support (13) is used for placing a bracket pushing oil cylinder (10);
the guide pulleys (15) are four slidable components provided with two pairs of roller groups, the guide pulleys (15) are fixed on the outer side of the platform vertical frame (14), and the guide pulleys (15) grasp the two sides of the flange of the vertical steel column (5) and slide up and down along the vertical steel column (5).
5. The steel platform inner cylinder put bracket single shear wall bearing test stand of claim 4, wherein the loading system comprises:
the hydraulic oil cylinder (6) is a vertical actuating device, and the rear end of the hydraulic oil cylinder (6) is fixed at the lower end of the top balance beam (4);
the device comprises an axial force sensor (7), wherein the axial force sensor (7) is used for monitoring the output axial force of the hydraulic oil cylinder (6), the front end of a telescopic rod of the hydraulic oil cylinder (6) is fixedly connected with the axial force sensor (7), and the axial force sensor (7) is connected with the door-shaped support (13).
6. The steel platform inner cylinder bracket single shear wall bearing test frame according to claim 5, wherein the control system is used for controlling the axial force magnitude and the telescopic posture of the hydraulic oil cylinder (6) and the bracket pushing oil cylinder (10) and monitoring the axial force data of the axial force sensor (7).
7. The steel platform inner cylinder resting bracket single shear wall pressure-bearing test frame according to claim 6, characterized in that the control system controls the hydraulic cylinder (6) to provide vertical force and transmits the vertical force to the platform frame (8) through the axial force sensor (7), the bracket fixing shoe (12) fixed on the L-shaped platform frame (8) transmits the vertical force to the resting bracket (9), the resting bracket (9) is in contact with the bracket pin housing (11) or the groove-shaped space, and finally transmits the downward axial force provided by the hydraulic cylinder (6) to the shear wall (2) structure.
8. A pressure-bearing test method for a steel platform inner cylinder bracket-resting single shear wall, which adopts the pressure-bearing test frame for the steel platform inner cylinder bracket-resting single shear wall as claimed in any one of claims 1 to 7, and comprises the following steps:
firstly, integrally pouring a single shear wall (2) on a bottom plate (1) according to a structural design scheme to complete the construction of a reaction frame system, installing a hydraulic oil cylinder (6) of a loading system at the lower end of a top balance beam (4) of the reaction frame system, installing an axial force sensor (7) of the loading system at the lower end of an expansion link of the hydraulic oil cylinder (6) of the loading system, a platform system is built on the bottom plate (1), a guide pulley (15) at the back of an L-shaped platform frame (8) of the platform system is clamped on the flange of a vertical steel column (5) of the counter force frame system, the bracket pushing oil cylinder (10) of the platform system controls the bracket (9) of the platform system to be in a retraction state, the hydraulic oil cylinder (6) is controlled by a control system to extend an expansion link of the hydraulic oil cylinder, so that an axial force sensor (7) at the lower end of the hydraulic oil cylinder is firmly fixed with a door-shaped bracket (13) of the platform system;
controlling a hydraulic oil cylinder (6) of the loading system to synchronously contract a telescopic rod of the hydraulic oil cylinder through the control system, so that the L-shaped platform frame (8) is integrally lifted to the height of a bracket pin shell (11) or a groove-shaped space of the shear wall (2);
thirdly, controlling a bracket pushing oil cylinder (10) of the platform system to extend out of a bracket pushing and placing bracket (9) to extend out of a bracket fixing boot (12) for a preset distance through the control system and extend into a bracket pin shell (11) or a groove-shaped space on the shear wall (2);
fourthly, controlling a hydraulic oil cylinder (6) of the loading system to apply a downward axial force to the platform system through the control system;
in the process of applying downward axial force, monitoring the magnitude of the downward axial force in real time through an axial force sensor (7), controlling the magnitude and the posture of the output axial force of a hydraulic oil cylinder (6), and simultaneously monitoring the deformation and the damage condition of a concrete structure near a bracket pin shell (11) or a groove-shaped space on the shear wall (2) in real time;
continuously applying a downward axial force according to a test scheme, after the purpose of the test is achieved, controlling a hydraulic oil cylinder (6) of the loading system to reduce the vertical force axial force until the vertical contact force between the placed bracket (9) and a bracket pin shell (11) or a groove-shaped space is zero through the control system, and controlling the bracket pushing oil cylinder (10) to contract through the control system so as to retract the placed bracket (9) into a bracket fixing boot (12); and controlling the hydraulic oil cylinder (6) to extend so as to lower the platform system onto the bottom plate (1) and form stable contact, and loosening the fixation of the axial force sensor (7) and the platform system until the test is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010216679.3A CN111380757A (en) | 2020-03-25 | 2020-03-25 | Steel platform inner cylinder bracket-placed single-shear-wall pressure-bearing test frame and test method |
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| CN202010216679.3A CN111380757A (en) | 2020-03-25 | 2020-03-25 | Steel platform inner cylinder bracket-placed single-shear-wall pressure-bearing test frame and test method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117554169A (en) * | 2023-11-17 | 2024-02-13 | 哈尔滨工业大学 | Fixed end restraint device for plate-shaped member surface external loading test and dismounting method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117554169A (en) * | 2023-11-17 | 2024-02-13 | 哈尔滨工业大学 | Fixed end restraint device for plate-shaped member surface external loading test and dismounting method thereof |
| CN117554169B (en) * | 2023-11-17 | 2024-05-28 | 哈尔滨工业大学 | Fixed end restraint device for plate-shaped member surface external loading test and dismounting method thereof |
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