CN204101361U - A kind of PCslab girder large deflection failure test device - Google Patents

A kind of PCslab girder large deflection failure test device Download PDF

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CN204101361U
CN204101361U CN201420457397.2U CN201420457397U CN204101361U CN 204101361 U CN204101361 U CN 204101361U CN 201420457397 U CN201420457397 U CN 201420457397U CN 204101361 U CN204101361 U CN 204101361U
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test
prestressed concrete
force
loading frame
crossbeam
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项贻强
张翔
廖小辉
赵荐
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Zhejiang University ZJU
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Zhejiang University ZJU
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Abstract

The utility model relates to a kind of PCslab girder large deflection failure test device.Wherein charger comprises loading frame, hydraulic jack, precise force-measuring sensor, test force distribution crossbeam, bearing, test Temporary Piers and counter-force conduit; Prestressed concrete test beam is symmetrical arranged two pairs of loading frames across 1/3rd places in footpath; Wide range strain gauge means comprises copper pipe sleeve, push rod, clock gauge, jacking block, check nut, base screw rod and plastic feet; Plastic feet is pasted onto the surface of prestressed concrete test beam; Carry out gauge length in advance, in two plastic feets, distance is in the heart at more than 30cm; Test loads test heterogeneous linear and non-linear two stages, and adopts different testing tools and method respectively.The utility model is provide a kind of effective device across footpath in the failure test of the PCslab girder of more than 20m, can be issued to the ultimate load of plate-girder at limited oil cylinder stroke, and each non-linear behavior parameter of Measurement accuracy.

Description

A kind of PCslab girder large deflection failure test device
Technical field
The utility model belongs to field of civil engineering, is specifically related to a kind of PCslab girder large deflection failure test device.
Background technology
By the failure test of concrete plate beam, can the behaviour in service of determination means and actual bearer ability.Current existing beams of concrete charger is all applicable to small deformation component, use a set of oil circuit add distribution beam or two cover oil circuits carry out three branch loadings, its oil cylinder range generally only has 20cm, and deflection displacement meter (sensor) testing range only has 5cm.To some across the PCslab girder of footpath at more than 20m, maximum defluxion when it destroys can reach about 50cm, three branch loading place amounts of deflection are significantly more than the range of oil cylinder, and the parameter test methods such as conventional deflection displacement meter (sensor) are also no longer applicable.
Existing test unit cannot meet the requirement of large deflection failure test, cannot test the usability of the PCslab girder of more than 20m and ultimate bearing capacity.
Summary of the invention
The purpose of this utility model is for the deficiencies in the prior art, provides a kind of PCslab girder large deflection failure test device.The utility model is provide a kind of effective charger across footpath in the failure test of the PCslab girder of more than 20m, and ensures the accurate test of nonlinear parameter.
A kind of PCslab girder large deflection failure test device, comprises charger, wide range strain gauge means; Charger comprises loading frame, hydraulic jack, precise force-measuring sensor, test force distribution crossbeam, bearing, test Temporary Piers and counter-force conduit; Wide range strain gauge means comprises copper pipe sleeve, push rod, clock gauge, jacking block, check nut, base screw rod and plastic feet; Two test Temporary Piers are set under prestressed concrete test beam; Be connected by bearing between prestressed concrete test beam with test Temporary Piers; Be symmetrical arranged two pairs of loading frames at prestressed concrete test beam across 1/3rd places in footpath, loading frame comprises loading frame column, loading frame crossbeam, and loading frame crossbeam is arranged between two loading frame columns, makes loading frame be H type; Bottom and the counter-force conduit of loading frame column fix;
Prestressed concrete test beam is provided with test force and distributes crossbeam, test force distribution crossbeam is provided with hydraulic jack, distribute between crossbeam and hydraulic jack at test force and be provided with precise force-measuring sensor; Hydraulic jack is distributed crossbeam by precise force-measuring sensor and test force and is delivered on prestressed concrete test beam by power; Hydraulic jack is fixed on the lower surface of loading frame crossbeam;
Described wide range strain gauge means comprises copper pipe sleeve, push rod, clock gauge, jacking block, check nut, base screw rod and plastic feet; Jacking block on push rod contacts with clock gauge; Push rod and clock gauge all through a copper pipe sleeve, are fixed with the check nut above copper pipe sleeve; Plastic feet and copper pipe sleeve are fixed by base screw rod, and plastic feet is pasted onto the surface of prestressed concrete test beam; Carry out gauge length in advance, in two plastic feets, distance is in the heart at more than 30cm.
Test loading is divided into linear stage and nonlinear phase;
Linear stage: be loaded on prestressed concrete test beam cracking load; The amount of deflection of linear stage is less, with the digit displacement transducer record of 5cm range, digit displacement transducer is arranged respectively in the spaning middle section of prestressed concrete test beam, quartile cross section and beam-ends cross section, and both sides, each cross section are furnished with digit displacement transducer simultaneously, the digit displacement transducer in beam-ends cross section is for recording support settlement displacement; Concrete strain measuring point adopts digital strain transducer, is arranged in the concrete surface in the spaning middle section of prestressed concrete test beam, quartile cross section and beam-ends cross section;
Nonlinear phase: be loaded on prestressed concrete test beam from occur cracking destroy to prestressed concrete test beam; The strain of prestressed concrete test beam is mean strain, and amount of deflection is large deflection and geometrical non-linearity trend; At prestressed concrete test beam span centre base plate longitudinal reinforcement, place chisels, and by reinforcing bar strain gauge adhesion at rebar surface; The digital strain transducer wide range strain gauge means of prestressed concrete test beam spaning middle section is substituted; Use crack observer observation fracture width, if fracture width exceedes crack observer range, then first carry out gauge length with flake aluminum in both sides, crack, and use vernier caliper to measure; Guy type displacement meter is used to measure the amount of deflection of prestressed concrete test beam 1 span centre and quartile;
When the oil cylinder of hydraulic jack reaches range, keep two inner side hydraulic jack stressed simultaneously only and prestressed concrete test beam amount of deflection is remained unchanged, then two outside hydraulic jack, oil cylinders are made to increase, distribute on crossbeam at test force and pad smooth steel plate, to increase oil cylinder stroke; In like manner, more only keep two outside hydraulic jack is stressed and to maintain prestressed concrete test beam amount of deflection constant, make two inner side hydraulic jack cylinders increase, distribute on crossbeam at test force and pad smooth steel plate; Slowly by each hydraulic jack load inversion to load during crude oil cylinder range, and continue load until structural failure.
The beneficial effects of the utility model are as follows:
The utility model can realize across the loading of footpath in the large deflection failure test of more than 20m concrete plate beam and the test of non-linear behavior parameter, the ultimate load of plate-girder is issued at limited oil cylinder stroke, the carrying out of warranty test, and Measurement accuracy component non-linear behavior parameter.
Accompanying drawing explanation
Fig. 1 is charger elevation drawing of the present utility model;
Fig. 2 is charger planimetric map of the present utility model;
Fig. 3 is charger side view of the present utility model;
Fig. 4 is wide range strain measurement device schematic diagram;
Fig. 5 is prestressed concrete test beam spaning middle section concrete strain and reinforcing bar strain measuring point schematic diagram.
In figure, prestressed concrete test beam 1, loading frame 2, hydraulic jack 3, precise force-measuring sensor 4, test force distribute crossbeam 5, loading frame column 6, loading frame crossbeam 7, bearing 8, test Temporary Piers 9, counter-force conduit 10, copper pipe sleeve 11, push rod 12, clock gauge 13, jacking block 14, check nut 15, base screw rod 16, plastic feet 17, concrete strain measuring point 18, amount of deflection measuring point 19, reinforcing bar strain measuring point 20.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5, a kind of PCslab girder large deflection failure test device, comprises loading unit, test cell; Loading unit comprises loading frame 2, hydraulic jack 3, precise force-measuring sensor 4, test force distribution crossbeam 5, bearing 8, test Temporary Piers 9 and counter-force conduit 10; Wide range strain gauge means comprises copper pipe sleeve 11, push rod 12, clock gauge 13, jacking block 14, check nut 15, base screw rod 16 and plastic feet 17; At prestressed concrete test beam, two test Temporary Piers 9 are set for 1 time; Be connected by bearing between prestressed concrete test beam 1 with test Temporary Piers 9; Two pairs of loading frames 2 are symmetrical arranged across 1/3rd places in footpath at prestressed concrete test beam 1, loading frame 2 comprises loading frame column 6, loading frame crossbeam 7, loading frame crossbeam 7 is arranged between two loading frame columns 6, makes loading frame 2 in H type; Bottom and the counter-force conduit 10 of loading frame column 6 fix;
Prestressed concrete test beam 1 is provided with test force and distributes crossbeam 5, test force distribution crossbeam 5 is provided with hydraulic jack 3, distribute between crossbeam 5 and hydraulic jack 3 at test force and be provided with precise force-measuring sensor 4; Hydraulic jack 3 is distributed crossbeam 5 by precise force-measuring sensor 4 and test force and is delivered on prestressed concrete test beam 1 by power; Hydraulic jack 3 is fixed on the lower surface of loading frame crossbeam 7.
Described wide range strain gauge means comprises copper pipe chuck 11, push rod 12 and clock gauge 13, and push rod 12 and clock gauge 13 are all fixed on prestressed concrete test beam 1 spaning middle section by a copper pipe chuck 11.
A kind of PCslab girder large deflection failure test device, concrete implementation step is as follows:
Step (1). prefabricated test Temporary Piers 9, and bearing 8 is arranged on test Temporary Piers 9.
Step (2). loading frame 2 is installed, two pairs of loading frames 2 is arranged on 1/3rd places of prestressed concrete test beam 1 across footpath; Loading frame 2 comprises loading frame column 6, loading frame crossbeam 7, and loading frame crossbeam 7 is arranged between two loading frame columns 6, makes loading frame 2 in H type; Bottom and the counter-force conduit 10 of loading frame column 6 fix; Prestressed concrete test beam 1 is provided with test force and distributes crossbeam 5, test force distribution crossbeam 5 is provided with hydraulic jack 3, distribute between crossbeam 5 and hydraulic jack 3 at test force and be provided with precise force-measuring sensor 4; Hydraulic jack 3 is distributed crossbeam 5 by precise force-measuring sensor 4 and test force and is delivered on prestressed concrete test beam 1 by power; Hydraulic jack 3 is fixed on the lower surface of loading frame crossbeam 7.
Described hydraulic jack 3 is connected with Loading Control module, and Loading Control module is used for loading and the lifting of hydraulic control lifting jack 3, and ensures synchronous loading.Described Loading Control module comprises oil pump, pipeline and computer control system, and computer control system control oil pump fuel feeding, oil pump is connected with hydraulic jack 3 by pipeline.
Loading frame column 6 in described loading frame 2, loading frame crossbeam 7 connect by reinforcing A-frame, and concrete employing Q235B Plate Welding forms;
Step (3). on prestressed concrete test beam 1, arrange concrete strain measuring point 18, reinforcing bar strain measuring point 20 and amount of deflection measuring point 19, and sensor is set on each measuring point, the data that each measuring point collects are sent in computer testing analytic system by sensor;
Described concrete strain measuring point 18 has 30 collection points on prestressed concrete test beam 1; Reinforcing bar strain measuring point 20 has 2 collection points on prestressed concrete test beam 1; Amount of deflection measuring point 19 has 10 collection points on prestressed concrete test beam 1;
Described computer testing analytic system comprises RS-QL06E Series Bridge and structural stress detection system and DH3815N static stress and deformation detecting and analysing system; RS-QL06E Series Bridge and structural stress detection system gather concrete strain measuring point 18 and amount of deflection measuring point 19 data, and DH3815N static stress and deformation detecting and analysing system gathers reinforcing bar strain measuring point 20 data.
Step (4). test loading is divided into linear stage and nonlinear phase.
4-1. linear stage: be loaded on prestressed concrete test beam 1 cracking load; The amount of deflection of linear stage is less, with the digit displacement transducer record of 5cm range, digit displacement transducer is arranged respectively in the spaning middle section of prestressed concrete test beam 1, quartile cross section and beam-ends cross section, and both sides, each cross section are furnished with digit displacement transducer simultaneously, the digit displacement transducer in beam-ends cross section is for recording support settlement displacement; Concrete strain measuring point 18 adopts digital strain transducer, is arranged in the concrete surface in the spaning middle section of prestressed concrete test beam 1, quartile cross section and beam-ends cross section.
4-2. nonlinear phase: be loaded on prestressed concrete test beam 1 from occur cracking destroy to prestressed concrete test beam 1; The strain of prestressed concrete test beam 1 is mean strain, and amount of deflection is large deflection and geometrical non-linearity trend; At prestressed concrete test beam 1 span centre base plate longitudinal reinforcement, place chisels, and by reinforcing bar strain gauge adhesion at rebar surface.The digital strain transducer wide range strain gauge means of prestressed concrete test beam 1 spaning middle section is substituted; Wide range strain gauge means comprises copper pipe sleeve, push rod, clock gauge, jacking block, check nut, base screw rod and plastic feet; Jacking block on push rod contacts with clock gauge; Push rod and clock gauge all through a copper pipe sleeve, are fixed with the check nut above copper pipe sleeve; Plastic feet and copper pipe sleeve are fixed by base screw rod, and plastic feet is pasted onto the surface of prestressed concrete test beam; Carry out gauge length in advance, in two plastic feets, distance is in the heart at more than 30cm.Use crack observer observation fracture width, if fracture width exceedes crack observer range, then first carry out gauge length with flake aluminum in both sides, crack, and use vernier caliper to measure; Guy type displacement meter is used to measure the amount of deflection of prestressed concrete test beam 1 span centre and quartile.
Step (5). when the oil cylinder of hydraulic jack 3 reaches range, as shown in Figure 2, only keep hydraulic jack 32 and 34 stressed simultaneously and prestressed concrete test beam 1 amount of deflection is remained unchanged, then hydraulic jack 31 and 33 oil cylinder is made to increase, distribute on crossbeam 5 at test force and pad smooth steel plate, to increase oil cylinder stroke.In like manner, more only keep that hydraulic jack 31 and 33 is stressed and to maintain prestressed concrete test beam 1 amount of deflection constant, make hydraulic jack 32 and 34 oil cylinder increase, test force distribution crossbeam 5 pads smooth steel plate; Slowly by each hydraulic jack load inversion to load during crude oil cylinder range, and continue load until structural failure.
Concrete model and the quantity of described failure test instrument are as shown in table 1:
Table 1 failure test key instrument gathers

Claims (2)

1. a PCslab girder large deflection failure test device, is characterized in that comprising charger, wide range strain gauge means; Charger comprises loading frame, hydraulic jack, precise force-measuring sensor, test force distribution crossbeam, bearing, test Temporary Piers and counter-force conduit; Wide range strain gauge means comprises copper pipe sleeve, push rod, clock gauge, jacking block, check nut, base screw rod and plastic feet; Two test Temporary Piers are set under prestressed concrete test beam; Be connected by bearing between prestressed concrete test beam with test Temporary Piers; Be symmetrical arranged two pairs of loading frames at prestressed concrete test beam across footpath 1/3rd place, loading frame comprises loading frame column, loading frame crossbeam, and loading frame crossbeam is arranged between two loading frame columns, makes loading frame be H type; Bottom and the counter-force conduit of loading frame column fix;
Prestressed concrete test beam is provided with test force and distributes crossbeam, test force distribution crossbeam is provided with hydraulic jack, distribute between crossbeam and hydraulic jack at test force and be provided with precise force-measuring sensor; Hydraulic jack is distributed crossbeam by precise force-measuring sensor and test force and is delivered on prestressed concrete test beam by power; Hydraulic jack is fixed on the lower surface of loading frame crossbeam;
Described wide range strain gauge means comprises copper pipe sleeve, push rod, clock gauge, jacking block, check nut, base screw rod and plastic feet; Jacking block on push rod contacts with clock gauge; Push rod and clock gauge all through a copper pipe sleeve, are fixed with the check nut above copper pipe sleeve; Plastic feet and copper pipe sleeve are fixed by base screw rod, and plastic feet is pasted onto the surface of prestressed concrete test beam; Carry out gauge length in advance, in two plastic feets, distance is in the heart at more than 30cm.
2. a kind of PCslab girder large deflection failure test device as claimed in claim 1, it is characterized in that on prestressed concrete test beam, arrange concrete strain measuring point, reinforcing bar strain measuring point and amount of deflection measuring point, and sensor is set on each measuring point, the data that each measuring point collects are sent in computer testing analytic system by sensor;
Described concrete strain measuring point has 30 collection points on prestressed concrete test beam; Reinforcing bar strain measuring point has 2 collection points on prestressed concrete test beam; Amount of deflection measuring point has 10 collection points on prestressed concrete test beam.
CN201420457397.2U 2014-08-13 2014-08-13 A kind of PCslab girder large deflection failure test device Active CN204101361U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104165807A (en) * 2014-08-13 2014-11-26 浙江大学 Large-deflection destruction testing device and method for prestressed concrete plate beam
CN105738176A (en) * 2016-03-07 2016-07-06 河海大学 Multifunctional device and method for model test pile foundation processing and detection
CN106979848A (en) * 2017-02-21 2017-07-25 武汉纺织大学 A kind of cuboid cavity workpiece automatic detection device and method
CN110389077A (en) * 2019-07-02 2019-10-29 武汉理工大学 A kind of more beam type Bending Concrete creep test devices and test method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104165807A (en) * 2014-08-13 2014-11-26 浙江大学 Large-deflection destruction testing device and method for prestressed concrete plate beam
CN104165807B (en) * 2014-08-13 2017-01-25 浙江大学 Large-deflection destruction testing device and method for prestressed concrete plate beam
CN105738176A (en) * 2016-03-07 2016-07-06 河海大学 Multifunctional device and method for model test pile foundation processing and detection
CN106979848A (en) * 2017-02-21 2017-07-25 武汉纺织大学 A kind of cuboid cavity workpiece automatic detection device and method
CN106979848B (en) * 2017-02-21 2019-02-19 武汉纺织大学 A kind of cuboid cavity workpiece automatic detection device and method
CN110389077A (en) * 2019-07-02 2019-10-29 武汉理工大学 A kind of more beam type Bending Concrete creep test devices and test method

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