CN109781549B - U-shaped beam static load test method - Google Patents
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- CN109781549B CN109781549B CN201910100090.4A CN201910100090A CN109781549B CN 109781549 B CN109781549 B CN 109781549B CN 201910100090 A CN201910100090 A CN 201910100090A CN 109781549 B CN109781549 B CN 109781549B
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Abstract
The invention provides a static load test method for a U-shaped beam, which belongs to the technical field of civil engineering and comprises a door type reaction frame, a load assembly, a displacement meter and a data acquisition unit; the method comprises the following steps: uniformly arranging a plurality of measuring points on a U-shaped beam, correspondingly arranging a displacement meter on each measuring point, and connecting the signal output ends of the displacement meters with a data acquisition unit; secondly, arranging loading equipment on the U-shaped beam, wherein the power output end of the loading equipment faces the beam body of the U-shaped beam; and step three, starting the loading equipment, applying a load to the U-shaped beam body, and collecting and recording data of the displacement meter. The U-shaped beam static load test method provided by the invention is used for respectively testing the U-shaped beam under three different working conditions so as to accurately test the static load capacity and the working performance of the U-shaped beam, and can be used for respectively judging and analyzing the strength, the rigidity and the stability of the U-shaped beam so as to provide a basis for the U-shaped beam to be used in urban rail transit construction.
Description
Technical Field
The invention belongs to the technical field of civil engineering, and particularly relates to a static load test method for a U-shaped beam.
Background
In recent years, with the rapid development of domestic rail transit construction, the U-shaped beam gradually enters the eyeball of people as a novel product. The U-shaped beam is used as a lower bearing type structure, and has the characteristics of good landscape effect, reduction of building height and small requirement on clearance. The U-shaped beam structure adopted in China at present is the same as the traditional channel beam structure, belongs to a space beam and plate combined structure, and under the action of external load, a bottom plate can be bent and twisted in two directions and can also participate in joint work of webs, so that the stress characteristic is spatial. However, compared with the conventional channel beam structure, there are the following differences: firstly, the U-shaped beam only stretches prestressed steel bars longitudinally, and the prestressed steel bars are cancelled transversely; secondly, webs on two sides of the U-shaped beam are asymmetric; particularly, the U-shaped beam is provided with prestressed reinforcements in the longitudinal direction, the stress is complex, and therefore, related tests need to be carried out on the structural form and the performance of the U-shaped beam so as to check the anti-cracking safety of the beam body and whether the bearing capacity and the working state of the beam body meet the design requirements.
Disclosure of Invention
The invention aims to provide a U-shaped beam static load test method to solve the technical problem that the U-shaped beam is damaged and unstable due to the fact that the U-shaped beam static load capacity and working state test research is lacked in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that: the U-shaped beam static load test method comprises the following steps:
uniformly arranging a plurality of measuring points on a U-shaped beam, correspondingly arranging a displacement meter on each measuring point, and connecting signal output ends of the displacement meters with signal input ends of a data acquisition unit;
secondly, arranging loading equipment on the U-shaped beam, wherein the power output end of the loading equipment faces the beam body of the U-shaped beam;
and step three, starting the loading equipment, applying a load to the U-shaped beam body, and collecting and recording data of the displacement meter.
Further, the first step comprises three different working conditions, namely a transverse bending static load test, a longitudinal bending static load test and a longitudinal bending failure test; and the loading equipment in the second step comprises a plurality of groups of load assemblies for the transverse bending static load test and door type reaction frames for the longitudinal bending static load test and the longitudinal bending failure test respectively.
The design load is the load that all components will withstand without failure during any given period. For a longitudinal bending static load test, a transverse bending static load test and a longitudinal bending failure test, the loads acting on the U-shaped beam have design loads corresponding to test working conditions, the design loads are designed through theoretical calculation, the design loads and the actual loads have deviation, the actual loads can be tested through the actual tests, and a basis can be provided for the U-shaped beam to be used in urban rail transit construction.
Furthermore, the load assembly comprises a scaffold arranged in the beam body of the U-shaped beam, a square steel tube arranged at the upper end of the scaffold, a hydraulic jack fixedly arranged on one end head of the square steel tube and a hydraulic pump station for supplying power to the hydraulic jack; one end of the square steel pipe is in contact with the inner side face of one end of the U-shaped beam, the other end of the square steel pipe is used for pushing the inner side face of the other end of the U-shaped beam through a hydraulic jack, and the square steel pipe is flush with the upper end face of the U-shaped beam;
the door type reaction frame comprises a frame body, a plurality of jacks arranged on the frame body and a driving system used for driving the jacks to act.
Further, the transverse bending static load test is used for testing the deflection of the control section of the U-shaped beam, and all data are collected after the load applied to the U-shaped beam by the load assembly is held for 5 minutes;
the longitudinal bending static load test is used for testing the deflection and crack conditions of the control section of the U-shaped beam, the U-shaped beam is arranged in the door type reaction frame, the pushing top ends of a plurality of jacks on the door type reaction frame face to the inner beam body of the U-shaped beam, and all data are collected after the door type reaction frame is loaded for 5 minutes;
the longitudinal bending failure test is used for testing the ultimate bending strength of the U-shaped beam, the U-shaped beam is arranged in the door type reaction frame, the pushing top ends of the jacks on the door type reaction frame face to the inner beam body of the U-shaped beam, and all data are collected after the door type reaction frame is loaded for 5 minutes.
Furthermore, the number of the load components is 5-10, a sleeper is arranged at one end of the square steel pipe, which is in contact with the U-shaped beam, and a sleeper is also arranged at the pushing end of the hydraulic jack; the hydraulic jack pushes a flange plate of the U-shaped beam, the pressure load is 68KN/m, and the acting force of the hydraulic jack is loaded in a grading mode according to the load of 10KN at each grade;
and the driving system drives the jack to act on the load of the U-shaped beam body to carry out graded loading according to the load of 10KN at each level.
Further, the third step of the longitudinal bending failure test comprises
(1) The load of the jack on the U-shaped beam is loaded according to 10KN load of each stage when the critical U-shaped beam is cracked from the beginning of loading;
(2) loading according to 5KN load of each stage from the cracking of the U-shaped beam to the occurrence of cracks with the width of 0.5mm near each control section;
(3) and loading the U-shaped beam according to the load of 3KN per grade from the maximum crack width of the U-shaped beam exceeding 0.5mm to the final failure of the critical structure.
Further, in the longitudinal bending static load test, the load acting on the U-shaped beam is performed in two cycles, namely, the dead load is performed firstly, then the live load is performed, and the bending moment to be achieved by the dead load is as follows: mq1 ═ 7339.03KN · m; the bending moment to be achieved by live load is Mq1 which is 7393.90KN m.
Furthermore, in the transverse bending static load test, measuring points are distributed at the top edge and the middle part of the inner side of the U-shaped beam, and the distance between the measuring points along the length direction of the U-shaped beam is 2 m;
in the longitudinal bending static load test, measuring points are arranged at the upper part and the middle part of the outer wall of the flange plate of the U-shaped beam and at the bottom of the U-shaped beam; the distance between the transverse measuring points along the U-shaped beam is 2 m;
in the longitudinal bending failure test, measuring points are arranged on two sides and the middle of the bottom of the U-shaped beam; the distance between the transverse measuring points along the U-shaped beam is 2 m.
Further, the following test preparations were made prior to the test:
1) a test shed is erected above the door type reaction frame and covers and buckles the door type reaction frame, the test shed is three-dimensional, the lower end of the test shed is open, the test shed is 5 meters in length, 2 meters in width and 5 meters in height;
2) connecting the power end of a jack on the door type reaction frame to a driving system;
3) the bottom of door-type reaction frame sets up the test bench seat, the U type roof beam is in test on the test bench seat.
Further, in the longitudinal bending failure test, the failure criterion of the U-shaped beam comprises,
the U-shaped beam completely enters a plasticity stage, the structural displacement and the strain are increased progressively under the action of load, the stability cannot be kept, namely the destruction of the beam body of the U-shaped beam is judged, the beam body is loaded to 1.5-1.8 times of design load, namely the plasticity stage is entered, the destruction of the beam body of the U-shaped beam is carried out when the load is loaded to 2.5-3.0 times of load, the strain and the deformation of the beam body are analyzed to be termination conditions, and the concrete conditions are as follows:
1) under the load-bearing effect, the vertical deformation of the beam body is continuously increased and cannot be stabilized;
2) under the load-bearing effect, the strain of the beam body is continuously increased and cannot be stabilized;
3) the jack has pressure drop phenomenon, and the applied load drops.
Furthermore, the test shed is made of stainless steel or hard plastic; the material of test bench is wooden.
The U-shaped beam static load test method provided by the invention has the beneficial effects that: compared with the prior art, the U-shaped beam static load test method provided by the invention has the advantages that the U-shaped beam is respectively tested under three different working conditions to accurately test the static load capacity and the working performance of the U-shaped beam, the strength, the rigidity and the stability of the U-shaped beam can be respectively judged according to the test of the specific steps of the test method, and finally test data are obtained, so that the technical problem that the U-shaped beam is damaged and destabilized due to the test research on the static load capacity and the working state of the U-shaped beam is solved, the static load capacity and the working state of the U-shaped beam are fully researched, and the strength, the rigidity and the stability of the U-shaped beam are analyzed, so that a basis is provided for the U-shaped beam in urban rail traffic construction.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a block diagram of the testing steps of the method for testing the static load of a U-shaped beam according to an embodiment of the present invention;
FIG. 2 is an elevation view of a door-type reaction frame of a U-shaped beam static test method according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a door-type reaction frame of a U-shaped beam static load test method according to an embodiment of the present invention;
fig. 4 is a schematic structural view of a U-shaped beam transverse bending static load test of the U-shaped beam static load test method according to the embodiment of the present invention;
FIG. 5 is a plan view of measuring points for a U-shaped beam transverse bending static load test according to the U-shaped beam static load test method provided by the embodiment of the invention;
fig. 6 is a sectional view of a U-shaped beam longitudinal bending static load test point of the U-shaped beam static load test method according to the embodiment of the present invention;
fig. 7 is a sectional view of a U-shaped beam longitudinal bending failure test point of the U-shaped beam static load test method according to the embodiment of the present invention.
In the figures, the various reference numbers: 1-door type reaction frame; 11-uplift pile; 12-a portal steel frame; 13-a support frame; 2-a jack; 3-U-shaped beam; 4-measuring points; 5-scaffolding; 6-square steel tube; 7-hydraulic jack; 8-a hydraulic pump station; 9-sleeper.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to 7, a method for testing a U-shaped beam in a static load according to an embodiment of the present invention will be described. The U-shaped beam static load test method comprises the following steps:
uniformly arranging a plurality of measuring points 4 on a U-shaped beam 3, correspondingly arranging a displacement meter on each measuring point 4, and connecting signal output ends of the displacement meters with signal input ends of a data acquisition unit;
secondly, arranging loading equipment on the U-shaped beam 3, wherein the power output end of the loading equipment faces the beam body of the U-shaped beam 3;
and step three, starting the loading equipment, applying a load to the beam body of the U-shaped beam 3, and collecting and recording data of the displacement meter.
Wherein, the first step comprises three different working conditions, namely a transverse bending static load test, a longitudinal bending static load test and a longitudinal bending failure test; the loading device in the second step comprises a plurality of groups of load assemblies for the transverse bending static load test and a door type reaction frame 1 for the longitudinal bending static load test and the longitudinal bending failure test respectively.
Compared with the prior art, the U-shaped beam static load test method provided by the embodiment of the invention is characterized in that the U-shaped beam 3 is respectively tested under three different working conditions to accurately test the static load capacity and the working performance of the U-shaped beam 3, the strength, the rigidity and the stability of the U-shaped beam 3 can be respectively judged according to the test of the specific steps of the test method, and finally test data are obtained, so that the technical problem that the U-shaped beam 3 is damaged and destabilized due to the lack of the test research on the static load capacity and the working state of the U-shaped beam 3 is solved, the static load capacity and the working state of the U-shaped beam 3 are fully researched, and the strength, the rigidity and the stability of the U-shaped beam 3 are analyzed to provide a basis for the U-shaped beam 3 to be used in urban rail transit construction
The design load is the load that all components will withstand without failure during any given period. For a longitudinal bending static load test, a transverse bending static load test and a longitudinal bending failure test, the loads acting on the U-shaped beam 3 have design loads corresponding to test working conditions, the design loads are designed through theoretical calculation, the design loads and the actual loads have deviation, the actual loads can be tested through the actual tests, and the basis can be provided for the U-shaped beam 3 to be used in urban rail transit construction.
Referring to fig. 1 to 7 together, as a specific implementation manner of the U-shaped beam static load testing method provided by the embodiment of the present invention, the load assembly includes a scaffold 5 disposed in a beam body of the U-shaped beam 3, a square steel pipe 6 disposed at an upper end of the scaffold 5, a hydraulic jack 7 fixedly disposed at an end of the square steel pipe 6, and a hydraulic pump station 8 for providing power to the hydraulic jack 7; one end of a square steel pipe 6 is in contact with the inner side face of one end of the U-shaped beam 3, the other end of the square steel pipe is used for pushing the inner side face of the other end of the U-shaped beam 3 through a hydraulic jack 7, and the square steel pipe 6 is flush with the upper end face of the U-shaped beam 3;
the door type reaction frame 1 comprises a frame body, a plurality of jacks 2 arranged on the frame body and a driving system used for driving the jacks 2 to act.
Referring to fig. 1 to 7 together, as a specific implementation of the U-shaped beam static load test method provided by the embodiment of the present invention, the transverse bending static load test is used to test the deflection of the control section of the U-shaped beam 3, and all data are collected after the load applied to the U-shaped beam 3 by the load assembly is held for 5 minutes;
the longitudinal bending static load test is used for testing the deflection and crack conditions of the control section of the U-shaped beam 3, the U-shaped beam 3 is arranged in the door type reaction frame 1, the pushing top ends of a plurality of jacks 2 on the door type reaction frame 1 face to the inner beam body of the U-shaped beam 3, and all data are collected after the load is held for 5 minutes;
the longitudinal bending failure test is used for testing the ultimate bending strength of the U-shaped beam 3, the U-shaped beam 3 is arranged in the door type reaction frame 1, the pushing top ends of the jacks 2 on the door type reaction frame 1 face the inner beam body of the U-shaped beam 3, and all data are collected after the load is held for 5 minutes.
Referring to fig. 1 to 7 together, as a specific implementation manner of the U-shaped beam static load testing method provided by the embodiment of the present invention, the number of the groups of the load assemblies is 5 to 10, a sleeper 9 is disposed on one end of the square steel tube 6 contacting the U-shaped beam 3, and a sleeper 9 is also disposed on the pushing end of the hydraulic jack 7; the hydraulic jack 7 pushes the flange plate of the U-shaped beam 3, the pressure load is 68KN/m, and the acting force of the hydraulic jack 7 is loaded in a grading mode according to the load of 10KN at each stage;
and the driving system drives the jack 2 to act on the load of the beam body of the U-shaped beam 3 to carry out graded loading according to the load of 10KN at each stage. The jack 2 on the door type reaction frame 1 acts on the U-shaped beam 3 to carry out graded loading according to 10KN of each grade. The loading step by step is carried out in a certain way, the loading quantity at each time is 10KN, and the change of the U-shaped beam 3 is synchronously observed, so that the real-time monitoring is facilitated, and the accurate test value is obtained.
Referring to fig. 1 to 7, a third step of the longitudinal bending failure test, which is an embodiment of the U-beam static load test method according to the present invention, includes
(1) The load of the jack 2 acting on the U-shaped beam 3 is loaded according to 10KN load of each stage when the critical U-shaped beam 3 is cracked from the beginning of loading;
(2) loading according to 5KN load of each stage when cracks with the width of 0.5mm appear near each control section after the U-shaped beam 3 is cracked;
(3) and loading the U-shaped beam 3 according to 3KN load of each stage from the maximum crack width of the U-shaped beam to exceed 0.5mm to the final failure of the critical structure.
Referring to fig. 1 to 7 together, as a specific implementation manner of the U-shaped beam static load test method provided by the embodiment of the present invention, in the longitudinal bending static load test, the load acting on the U-shaped beam 3 is performed in two cycles, that is, first, the constant load is performed, and then, the live load is performed, and the bending moment to be achieved by the constant load is: mq1 ═ 7339.03KN · m; the bending moment to be achieved by live load is Mq1 which is 7393.90KN m.
Referring to fig. 1 to 7 together, as a specific implementation manner of the U-shaped beam static load test method provided by the embodiment of the present invention, in the transverse bending static load test, the measuring points 4 are arranged at the top edge and the middle part of the inner side of the U-shaped beam 3, and the distance between the measuring points 4 along the length direction of the U-shaped beam 3 is 2 m;
in the longitudinal bending static load test, the measuring points 4 are arranged at the upper part and the middle part of the outer wall of the flange plate of the U-shaped beam 3 and at the bottom of the U-shaped beam 3; the distance between the transverse measuring points 4 along the U-shaped beam 3 is 2 m;
in the longitudinal bending failure test, measuring points 4 are arranged on two sides and the middle of the bottom of the U-shaped beam 3; the distance between the transverse measuring points 4 along the U-shaped beam 3 is 2 m.
Referring to fig. 1 to 7, as a specific implementation of the U-beam static load testing method provided by the embodiment of the present invention, the following test preparations are performed before the test:
1) a test shed is erected above the door type reaction frame 1 and is covered and buckled with the door type reaction frame, the test shed is three-dimensional, the lower end of the test shed is open, the test shed is 5 meters in length, 2 meters in width and 5 meters in height;
2) connecting the power end of a jack 2 on the door type reaction frame 1 to a driving system;
3) a test bench is arranged at the bottom of the door type reaction frame 1, and the U-shaped beam 2 is tested on the test bench. Only in the work of well-done foundation, the acting force acting on the U-shaped beam 3 can be ensured, better test data can be obtained, and reference is provided for the practical application parameters of the U-shaped beam.
Referring to fig. 1 to 7 together, as an embodiment of the U-beam static load test method provided by the present invention, in the longitudinal bending failure test, the failure criteria of the U-beam includes,
the U-shaped beam 3 completely enters a plasticity stage, and the structural displacement and the strain are increased progressively under the action of holding load, the stability can not be kept, namely, the 3 beam body of the U-shaped beam is judged to be damaged, when the beam body is loaded to 1.5-1.8 times of design load, namely, the plasticity stage is entered, when the beam body is loaded to 2.5-3.0 times of load, the 3 beam body of the U-shaped beam is damaged, and the strain and the beam body deformation are analyzed to be termination conditions, wherein the concrete conditions are as follows:
1) under the load-bearing effect, the vertical deformation of the beam body is continuously increased and cannot be stabilized;
2) under the load-bearing effect, the strain of the beam body is continuously increased and cannot be stabilized;
3) the jack 2 has pressure drop phenomenon, and the applied load drops.
Referring to fig. 1 to 7 together, as a specific implementation manner of the U-shaped beam static load testing method provided by the embodiment of the present invention, the material of the testing shed is stainless steel or hard plastic; the material of test bench is wooden. The test shed is built to guarantee good accuracy when testing the U-shaped beam 3, and the test shed is only covered and buckled above the door type reaction frame 1 and can be detached and moved flexibly and conveniently.
Referring to fig. 1 to 7 together, as a specific implementation manner of the U-shaped beam static load testing method provided by the embodiment of the present invention, the door-type reaction frame 1 includes two anti-pulling piles 11 and a door-type steel frame 12, the anti-pulling piles 11 are fixed on the ground, the door-type steel frame 12 is horizontally lapped between the two anti-pulling piles 11, or a support frame 13 is fixedly disposed on the door-type steel frame 12, the support frame 13 can provide a certain length for the jack 2, so that the jack 2 is disposed on the door-type steel frame 12 and can generate a driving force to act on the U-shaped beam 3, and the anti-pulling piles 11 and the door-type steel frame 12 are both made of Q345 b. The power input end of the jack 2 is connected to a driving system and acts by the driving force of the driving system.
The U-shaped beam static load test method has the beneficial effects that: the method is characterized in that the structure of the U-shaped beam 3 is tested under three different working conditions respectively to accurately test the static load capacity and the working performance of the U-shaped beam 3, the strength, the rigidity and the stability of the U-shaped beam 3 can be judged respectively according to the specific steps of the test method, and finally test data are obtained.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
- The U-shaped beam static load test method is characterized by comprising the following steps:uniformly arranging a plurality of measuring points on a U-shaped beam, correspondingly arranging a displacement meter on each measuring point, and connecting signal output ends of the displacement meters with signal input ends of a data acquisition unit;secondly, arranging loading equipment on the U-shaped beam, wherein the power output end of the loading equipment faces the beam body of the U-shaped beam;starting loading equipment, applying a load to the U-shaped beam body, and collecting and recording data of the displacement meter;the first step comprises three different working conditions, namely a transverse bending static load test, a longitudinal bending static load test and a longitudinal bending failure test; the loading equipment in the second step comprises a plurality of groups of load assemblies for the transverse bending static load test and door type reaction frames for the longitudinal bending static load test and the longitudinal bending failure test respectively;the load assembly comprises a scaffold arranged in a beam body of the U-shaped beam, a square steel tube arranged at the upper end of the scaffold, a hydraulic jack fixedly arranged on one end of the square steel tube and a hydraulic pump station for supplying power to the hydraulic jack; one end of the square steel pipe is in contact with the inner side face of one end of the U-shaped beam, the other end of the square steel pipe is used for pushing the inner side face of the other end of the U-shaped beam through a hydraulic jack, and the square steel pipe is flush with the upper end face of the U-shaped beam;the door type reaction frame comprises a frame body, a plurality of jacks arranged on the frame body and a driving system used for driving the jacks to act.
- 2. The U-beam static test method of claim 1, wherein: the transverse bending static load test is used for testing the deflection of the control section of the U-shaped beam, and all data are collected after the load applied to the U-shaped beam by the load assembly is held for 5 minutes;the longitudinal bending static load test is used for testing the deflection and crack conditions of the control section of the U-shaped beam, the U-shaped beam is arranged in the door type reaction frame, the pushing top ends of a plurality of jacks on the door type reaction frame face to the inner beam body of the U-shaped beam, and all data are collected after the door type reaction frame is loaded for 5 minutes;the longitudinal bending failure test is used for testing the ultimate bending strength of the U-shaped beam, the U-shaped beam is arranged in the door type reaction frame, the pushing top ends of the jacks on the door type reaction frame face to the inner beam body of the U-shaped beam, and all data are collected after the door type reaction frame is loaded for 5 minutes.
- 3. The U-beam static test method of claim 1, wherein: the number of the load components is 5-10, a sleeper is arranged at one end of the square steel pipe, which is in contact with the U-shaped beam, and a sleeper is also arranged at the pushing end of the hydraulic jack; the hydraulic jack pushes a flange plate of the U-shaped beam, the pressure load is 68KN/m, and the acting force of the hydraulic jack is loaded in a grading mode according to the load of 10KN at each grade;and the driving system drives the jack to act on the load of the U-shaped beam body to carry out graded loading according to the load of 10KN at each level.
- 4. A U-beam static test method as claimed in claim 3, wherein: step three of the longitudinal bending failure test comprises(1) The load of the jack on the U-shaped beam is loaded according to 10KN load of each stage when the critical U-shaped beam is cracked from the beginning of loading;(2) loading according to 5KN load of each stage from the cracking of the U-shaped beam to the occurrence of cracks with the width of 0.5mm near each control section;(3) and loading the U-shaped beam according to the load of 3KN per grade from the maximum crack width of the U-shaped beam exceeding 0.5mm to the final failure of the critical structure.
- 5. The U-beam static test method of claim 1, wherein: in the longitudinal bending static load test, the load acting on the U-shaped beam is carried out in two circulations, namely, the dead load is carried out firstly, then the live load is carried out, and the bending moment to be reached by the dead load is as follows: mq1 ═ 7339.03KN · m; the bending moment to be achieved by live load is Mq1 which is 7393.90KN m.
- 6. The U-beam static test method of claim 1, wherein: in the transverse bending static load test, measuring points are distributed at the top edge and the middle part of the inner side of the U-shaped beam, and the distance between the measuring points along the length direction of the U-shaped beam is 2 m;in the longitudinal bending static load test, measuring points are arranged at the upper part and the middle part of the outer wall of the flange plate of the U-shaped beam and at the bottom of the U-shaped beam; the distance between the transverse measuring points along the U-shaped beam is 2 m;in the longitudinal bending failure test, measuring points are arranged on two sides and the middle of the bottom of the U-shaped beam; the distance between the transverse measuring points along the U-shaped beam is 2 m.
- 7. The U-beam static test method of claim 1, wherein: the following test preparations were made prior to testing:1) a test shed is erected above the door type reaction frame and covers and buckles the door type reaction frame, the test shed is three-dimensional, the lower end of the test shed is open, the test shed is 5 meters in length, 2 meters in width and 5 meters in height;2) connecting the power end of a jack on the door type reaction frame to a driving system;3) the bottom of door-type reaction frame sets up the test bench seat, the U type roof beam is in test on the test bench seat.
- 8. The U-beam static test method of claim 1, wherein: in the longitudinal bending failure test, the failure criteria of the U-shaped beam comprise,the U-shaped beam completely enters a plasticity stage, the structural displacement and the strain are increased progressively under the action of load, the stability cannot be kept, namely the destruction of the beam body of the U-shaped beam is judged, the beam body is loaded to 1.5-1.8 times of design load, namely the plasticity stage is entered, the destruction of the beam body of the U-shaped beam is carried out when the load is loaded to 2.5-3.0 times of load, the strain and the deformation of the beam body are analyzed to be termination conditions, and the concrete conditions are as follows:1) under the load-bearing effect, the vertical deformation of the beam body is continuously increased and cannot be stabilized;2) under the load-bearing effect, the strain of the beam body is continuously increased and cannot be stabilized;3) the jack has pressure drop phenomenon, and the applied load drops.
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