CN111947874A - Surface force effect based beam type member anti-explosion effect test device and method - Google Patents
Surface force effect based beam type member anti-explosion effect test device and method Download PDFInfo
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- 230000000694 effects Effects 0.000 title claims abstract description 55
- 238000012360 testing method Methods 0.000 title claims abstract description 31
- 238000004880 explosion Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title abstract description 8
- 239000002360 explosive Substances 0.000 claims abstract description 47
- 238000006073 displacement reaction Methods 0.000 claims abstract description 44
- 230000009471 action Effects 0.000 claims abstract description 31
- 238000005452 bending Methods 0.000 claims abstract description 30
- 230000007935 neutral effect Effects 0.000 claims abstract description 23
- 238000005096 rolling process Methods 0.000 claims abstract description 12
- 230000000452 restraining effect Effects 0.000 claims description 11
- 230000007246 mechanism Effects 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 5
- 238000010998 test method Methods 0.000 claims description 5
- 238000013480 data collection Methods 0.000 claims description 2
- 230000005483 Hooke's law Effects 0.000 claims 2
- 238000003556 assay Methods 0.000 claims 1
- 238000007405 data analysis Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 description 10
- 238000004891 communication Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 238000013461 design Methods 0.000 description 3
- 238000005474 detonation Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000010205 computational analysis Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- 239000010949 copper Substances 0.000 description 1
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- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
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Abstract
The invention discloses a surface force effect-based beam type member anti-explosion effect test device and method, wherein two ends of a plurality of circular pull rods symmetrically arranged at two transverse sides of a beam type member are connected with clamping plates positioned at two longitudinal sides of the beam type member, so that the clamping plates fix cushion blocks against the longitudinal end surface of the beam type member through rolling shafts, and a data acquisition device is used for acquiring tensile strain data monitored by resistance strain gauges at different momentsiAnd vertical displacement data monitored by the displacement sensor, so as to provide the elastic modulus E known by the round pull rodsCross-sectional area A and distance D between the axis of each round tie rod and the neutral planeiCalculating and statistically analyzing to obtain longitudinal total constraint force data N and total resisting bending moment data M which are provided for the beam type member by all the circular pull rods at different moments so as to obtain the surface force corresponding to the vertical displacement of the beam type member at different moments under the action of explosive loadAnd the deflection-time relationship of the beam member under explosive loading and surface force effects.
Description
Technical Field
The invention relates to the technical field of beam member explosion resistance tests, in particular to a beam member explosion resistance test device and method based on a surface force effect.
Background
In blast resistant structures, plates with weak link frame beams or enclosure constraints of analogous stiffness are not amenable to simplification as simply supported or braced beam members. The lower edge of the beam-like element is stretched under the effect of the explosion and its longitudinal deformation is in some cases restrained by the abutment, so that the ends of the beam-like element are compressed and the elongation of the tension zone is limited, while longitudinal pressure is generated inside the structure. And because the longitudinal pressure belongs to the eccentric force of the tension area at the lower part of the beam type component, the action of bending moment is further generated at the contact boundary of the support and the component. Meanwhile, the combined action of the longitudinal pressure and the bending moment (namely, the surface force effect) changes along with the change of the deflection of the beam-type component, and the resistance and the failure mode of the structure are changed.
In general, the resistance of the beam member is obviously improved due to the surface force effect, and the traditional yield line theory does not consider the influence of the surface force effect on the resistance of the beam member, for example, the existing design specifications consider the influence of the surface force effect on the resistance as a safety reserve without further research, or comprehensively consider the structural resistance obtained based on the yield line theory multiplied by a coefficient of 1.5-2.0, so that the structural bearing capacity of the beam member is seriously underestimated, the bearing capacity is difficult to be reasonably utilized, and the manufacturing material and the manufacturing cost of the beam member are increased. Therefore, the structural bearing capacity (resistance) of the beam-type component can be more accurately predicted by clearing the action mechanism of the surface force effect on the structural resistance of the beam-type component, so that the bearing capacity of the beam-type component can be reasonably utilized, and the manufacturing material and the manufacturing cost are saved.
Disclosure of Invention
The invention mainly aims to provide a surface effect-based beam member anti-explosion effect testing device and method, and aims to obtain relevant experimental data so as to research and clarify the action mechanism of the surface effect on the structural resistance of the beam member.
In order to achieve the above object, the present invention provides a surface force effect based device for testing the anti-explosion effect of a beam member, comprising:
the surface force loading mechanism comprises cushion blocks, clamping plates, a plurality of rolling shafts and a plurality of circular pull rods, wherein the cushion blocks are respectively attached to the parts, located below a neutral surface, of the two longitudinal end surfaces of the beam-type member, the clamping plates are longitudinally opposite to the cushion blocks, the rolling shafts are located between the cushion blocks and the clamping plates, the circular pull rods are symmetrically arranged on the two transverse sides of the beam-type member and are vertically distributed at intervals along the parts, located below the neutral surface, opposite wall surfaces of the cushion blocks and the clamping plates are respectively provided with opposite horizontal grooves for the local clamping of the rolling shafts, and the two ends of all the circular pull rods are respectively connected with the clamping plates, so that the cushion blocks are;
the resistance strain gauges are respectively arranged on the circular pull rods on at least one side of the beam-type member in the transverse direction and used for monitoring tensile strain data of the circular pull rodsi；
The displacement sensors are arranged right below the beam-type component and distributed at intervals in the longitudinal direction and are used for monitoring the vertical displacement of different parts of the beam-type component; and the data acquisition device is used for acquiring tensile strain data monitored by each resistance strain gauge at different moments when the beam member is subjected to combined action of explosive load and surface forceiAnd the vertical displacement data monitored by each displacement sensor is used for providing the elastic modulus E known by the following and round pull rodssKnown cross-sectional area A and known distance D between the axis of each round tie rod and the neutral planeiAnd calculating and statistically analyzing to obtain longitudinal total constraint force data N and total resisting bending moment data M which are provided for the beam type member by all the circular pull rods at different moments so as to obtain the surface force corresponding to the vertical displacement of the beam type member at different moments under the action of the explosive load and the deflection-time relation of the beam type member under the action of the explosive load and the surface force effect.
The invention also provides a surface force effect-based beam member anti-explosion effect test method, which comprises the following steps:
s1, arranging a test device, and arranging explosive at a certain height right above the beam-type member;
s2, detonating the explosive to apply explosive load to the upper surface of the beam-type component;
s3, collecting the data at different moments when the beam member is under the action of explosive load through a data acquisition and analysis deviceTensile strain data monitored by each resistance strain gaugeiAnd the vertical displacement monitored by each displacement sensor, so as to provide the elastic modulus E known by the following and round pull rodssKnown cross-sectional area A and known distance D between the axis of each round tie rod and the neutral planeiAnd calculating and statistically analyzing to obtain longitudinal total constraint force data N and total resisting bending moment data M which are provided for the beam type member by all the circular pull rods at different moments so as to obtain the surface force corresponding to the vertical displacement of the beam type member at different moments under the action of the explosive load and the deflection-time relation of the beam type member under the action of the explosive load and the surface force effect.
The technical proposal of the invention is that the parts of the two longitudinal end surfaces of the beam-type member below the neutral surface are provided with cushion blocks attached with the beam-type member, the two ends of a plurality of circular pull rods which are symmetrically arranged at the two transverse sides of the beam-type member and are vertically distributed at intervals along the part below the neutral surface are connected with the clamping plates at the two longitudinal sides of the beam-type member, so that the clamping plates fix the cushion blocks against the longitudinal end surfaces of the beam-type member through rolling shafts, so that the sliding dislocation between the clamping plate and the cushion block in the vertical direction can be prevented through the roller bearing which is partially clamped into the groove, so as to ensure that the splint and the cushion block can swing in accordance with the beam-type member under the action of explosive load, and the longitudinal pressure and the bending moment combined action (namely the surface force effect) is formed on the end part of the beam-type component through the longitudinal constraint action of the round pull rod, meanwhile, the tensile strain monitored by each resistance strain gauge is collected at different moments through a data collection device.iData and vertical displacement data monitored by each displacement sensor for providing the elastic modulus E known by the round pull rodsKnown cross-sectional area A and known distance D between the axis of each round tie rod and the neutral planeiCalculating and statistically analyzing to obtain longitudinal total constraint force data N and total resisting bending moment data M which are provided for the beam type member by all the circular pull rods at different moments so as to obtain the surface force corresponding to the vertical displacement of the beam type member at different moments under the action of the explosive load and the deflection-time relation of the beam type member under the action of the explosive load and the surface force effect, and quantitatively judging the anti-explosion relation of the beam type member under the surface force effectThe impact of the blasting bearing capacity, so that the bearing capacity of the beam type member can be reasonably utilized, the engineering anti-explosion design is correctly guided, and the manufacturing material and the manufacturing cost are saved.
Drawings
FIG. 1 is a longitudinal cross-sectional view of one embodiment of the present invention;
FIG. 2 is a schematic view of the engagement of the cleats, spacer blocks and rollers with the beam member;
FIG. 3 is a longitudinal view of the splint;
fig. 4 is a schematic view of the operation principle of the spacer block, the round tie rod and the beam member.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that if directional indications (such as … …, which is up, down, left, right, front, back, top, bottom, inner, outer, vertical, transverse, longitudinal, counterclockwise, clockwise, circumferential, radial, axial) are provided in the embodiments of the present invention, the directional indications are only used for explaining the relative position relationship, motion condition, etc. of the components at a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first" or "second", etc. in the embodiments of the present invention, the description of "first" or "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a surface force effect-based beam type component anti-explosion effect testing device.
In the embodiment of the invention, as shown in fig. 1 to 4, the device for testing the anti-explosion effect of the beam member based on the surface force effect comprises a surface force loading mechanism 1, a plurality of resistance strain gauges 2, a plurality of displacement sensors 3 and a data acquisition device (not shown).
The surface force loading mechanism 1 includes a cushion block 11 attached to the portions of the beam member 100 below the neutral plane at the two longitudinal end surfaces, a clamp plate 12 longitudinally opposite to the cushion block 11, a plurality of rollers 13 located between the cushion block 11 and the clamp plate 12, and a plurality of circular pull rods 14 symmetrically disposed at two lateral sides of the beam member 100 and vertically distributed at intervals along the portions below the neutral plane (which may include the neutral plane). Opposite horizontal grooves 111 and 121 are formed in opposite wall surfaces of the cushion block 11 and the clamp plate 12 respectively and can be used for partially clamping the roller 13, so that sliding dislocation between the clamp plate 12 and the cushion block 11 in the vertical direction in the test process is prevented, two ends of all the circular pull rods 14 are connected with the clamp plate 12 respectively, the clamp plate 12 enables the cushion block 11 to be fixedly abutted to the longitudinal end surface of the beam-type member 100 through the roller 13, the cushion block 11 provides rigid support for rotation of the clamp plate 12, so that the clamp plate 12 and the cushion block 11 can swing in accordance with the beam-type member 100 under the action of explosive load, and a combined action of longitudinal pressure and bending moment (namely a surface force effect) is formed on the end part of the beam-type member 100 through the longitudinal restraining action of the circular pull rods 14. The resistance strain gauges 2 are respectively arranged on the round pull rods 14 at least one side of the beam-type member 100 in the transverse direction and used for monitoring tensile strain data of the round pull rods 14i. The displacement sensors 3 are disposed under the beam member 100 and distributed at intervals in the longitudinal direction, and are used for monitoring vertical (or called vertical) displacements of different portions of the beam member 100. The data acquisition device is used for acquiring tensile strain data monitored by each resistance strain gauge 2 at different moments when the beam member 100 is subjected to combined action of explosive load and surface forceiAnd respective displacementVertical displacement data monitored by the sensor 3. For subsequent known modulus of elasticity E of the round tie rod 14sA known cross-sectional area a and a known distance D of the axis of each round tie rod 14 from the neutral planeiThe calculation and the statistical analysis are carried out in combination (i.e. the moment arm), so as to obtain the longitudinal total restraining force data N and the total resisting bending moment data M (the longitudinal total restraining force data N and the total resisting bending moment data M provided by the beam member 100 by the circular pull rods 14 finally act on the end of the beam member 100 through the clamping plates and form the combined action of longitudinal pressure and bending moment) provided by the beam member 100 at different times, so as to obtain the surface force corresponding to the vertical displacement of the beam member 100 at different times under the action of the explosive load and the deflection-time relation of the beam member 100 under the explosive load and the surface force effect, and quantitatively judge the influence of the surface force on the anti-explosive bearing force of the beam member, thereby reasonably utilizing the bearing force of the beam member 100 and saving the manufacturing materials and the manufacturing cost.
In the embodiment of the present invention, the connection between the circular pull rod 14 and the clamping plate 12 can be achieved in various ways, such as by a snap structure, welding or by a screw connection structure. Preferably, the clamping plates 12 on both sides are provided with through holes 122 at positions corresponding to the circular pull rods 14, the outer peripheries of the ends of the circular pull rods 14 are provided with external threads, and the ends of the circular pull rods 14 are screwed with the nuts 15 after passing through the through holes 122, so that the clamping plates 12 fix the cushion blocks 11 against the longitudinal end surfaces of the beam-type member 100 through the rollers 13.
In the embodiment of the present invention, the number of the rollers 13 may be two, three, four, five or more, the diameter of the roller 13 is suitable for the horizontal grooves 111 and 121 located on the cushion block 11 and the clamping plate 12, and the cross sections of the horizontal grooves 111 and 121 are minor arcs for the rollers 13 to be partially clamped in respectively. After the clamping, the cushion block 11 and the clamping plate 12 are spaced in the longitudinal direction, so that the clamping plate 12 and the cushion block 11 are prevented from sliding and dislocating in the vertical direction during the test. Specifically, the number of the rollers 13 is preferably consistent with that of the round pull rods 14, and the extension lines of the axes of the rollers 13 are preferably perpendicular to the round pull rods 14, so as to facilitate the determinationDistance D between the axis of the round rod pull rod 14 and the neutral planei。
In the embodiment of the present invention, the number of the circular pull rods 14 symmetrically arranged at the two lateral sides of the beam member 100 may be two, three, four, five or more, and different constraint effects on the beam member may be achieved by adjusting the number and the positions of the circular pull rods 14. For ease of computational analysis, all of the round tie rods 14 are preferably made of the same material, such that all of the round tie rods 14 have the same modulus of elasticity EsThe cross-sectional area of the round tie rod 14 is preferably the same for ease of computational analysis.
It can be understood that the displacement sensor 3 is a conventional technology, and has various embodiments, preferably a slide wire resistance type displacement meter, which can be connected to the data acquisition device through a data wire or a wireless communication module (at least one of a WIFI communication module, a GPRS communication module, or a bluetooth communication module), and acquire a vertical displacement data detected by the corresponding displacement sensor 3 by adjusting the sampling frequency of the data acquisition device, for example, every 0.001 ms, and automatically record the deflections corresponding to different times, thereby obtaining the deflection-time relationship curve of the beam-type member 100 during the test.
It can be understood that the resistance strain gauge 2 is a conventional art, which is adhered to the circumference arm corresponding to the corresponding circular pull rod 14 and connected to the data acquisition device through a data line or a wireless communication module (such as at least one of a WIFI communication module, a GPRS communication module, or a bluetooth communication module), and the sampling frequency of the data acquisition device is adjusted to acquire one tensile strain data detected by the corresponding resistance strain gauge 2, for example, every 0.001 msi。
In the embodiment of the present invention, the beam member 100 is horizontally erected on two rigid buttresses 200 horizontally spaced apart from each other, both ends of the beam member 100 are supported by rigid supports 201 on the tops of the buttresses 200, the surfaces of the rigid supports 201 supporting both ends of the beam member 100 are horizontally arranged arc surfaces to limit vertical movements of both ends of the beam member 100 and ensure that the beam member 100 can freely extend and contract in the longitudinal direction, the beam member 100 preferably has an equal cross section, and the cross section preferably has a rectangular or square shape. The rigid buttresses 200 are fixed on a rigid ground, the rigid cross beam 300 is connected between the two rigid buttresses 200, the rigid cross beam 300 is positioned under the beam-type member 100 and is shielded by the beam-type member 100, the number of the displacement sensors 3 can be two, three, four, five or more, as shown in fig. 1, the three displacement sensors 3 are longitudinally arranged at intervals at positions of the rigid cross beam 300 under the beam-type member 100, and the displacement sensors 3 can be prevented from being damaged due to the impact of explosion shock waves while the vertical displacement of corresponding positions of the beam-type member 100 is accurately detected.
Preferably, the displacement sensors 3 are uniformly spaced from a position corresponding to the center of the beam member 100 toward one of the rigid piers 200. The rigid buttress 200 (including the rigid support 201) and the rigid cross-member 300 may be made of rigid material, for example, the rigid cross-member 300 may be made of angle steel, and both ends of the rigid cross-member are detachably connected to the buttress 200.
It can be understood that the longitudinal total constraint force data N and the total resistance bending moment data M can be obtained by calculation based on the stress-strain relationship of Hooke's (Hooke) law, specifically:
from bottom to top, the longitudinal restraining force provided by each two symmetrical round tie rods 14:
Ni＝2iEsa formula (1);
total longitudinal restraint provided by all round tie rods 14:
N＝∑Niformula (2);
from bottom to top, each two symmetrical round tie rods 14 provide a bending moment resistance:
Mi＝2iEsADiformula (3);
the total resistance bending moment provided by all round tie rods 14:
M＝∑Miformula (4);
substituting formula (1) into formula (2) can obtain the total longitudinal restraining force N provided by all the round pull rods 14, substituting formula (3) into formula (4) can obtain the total resisting bending moment M provided by all the round pull rods 14, wherein EsBullet being a round pull rod 14Modulus of elasticity, A is the cross-sectional area of the round tie rod 14, DiThe distance between the axis of the circular tie rod 14 and the neutral plane, is a known quantity,ii is 1, 2, 3.
The number of the circular pull rods 14 symmetrically arranged at the two transverse sides of the beam-type member 100 is three, and the axes of the circular pull rods 14 positioned at the top are coincided with the neutral plane (namely D)30) and the axial distances between every two vertical adjacent round pull rods 14 are D (namely D)1＝2d，D2D) for example, the total longitudinal restraining force N provided by all the round tie rods 14 is N1+N2+N3＝2(1+2+3)EsA; the total resisting bending moment M ═ N provided by all the round tie rods 141·D1+N2·D2＝2EsAd(21+2)。
Specifically, the method further comprises a calculating and analyzing device, wherein the calculating and analyzing device can calculate the stress-strain relation based on Hooke's (Hooke) law, obtain longitudinal total constraint force data N and total resisting bending moment data M, obtain the deflection-time relation of the beam-type member 100 under the explosive load and the surface force effect, and quantitatively judge the influence of the surface force effect on the anti-explosive bearing capacity of the beam-type member. Specifically, the calculating and analyzing device may be computer software stored in a memory of the data collecting device, or may be a device independent from the data collecting device.
After the embodiment of the test apparatus for testing the anti-explosion effect of the beam member based on the surface force effect according to the present invention is described, an embodiment of the test method for testing the anti-explosion effect of the beam member based on the surface force effect according to the present invention will be described. The specific structure of the device for testing the explosion resistance of the beam-type component based on the surface force effect is shown in the above embodiments, and the repeated points may not be described in detail.
The invention also provides a surface force effect-based beam member anti-explosion effect test method, which comprises the following steps:
s1, arranging a test device, and arranging explosive at a certain height right above the beam-type member 100;
specifically, the explosive is preferably a TNT spherical explosive, which is suspended at a position directly above the center of the beam member 100, and the vertical distance between the explosive and the beam member 100 can be determined according to the test requirements and by combining the equivalent weight of the explosive and the factors such as the material, the length and the cross section size of the beam member 100.
S2, detonating the explosive to apply explosive load to the upper surface of the beam-type component 100 (namely, generating explosive shock wave action to the beam-type component 100);
specifically, there are various embodiments for detonation of the explosive, so as to ensure the safety of the test and not influence the smooth proceeding of the test. For example, a No. 4 copper electric detonator may be used for remote center detonation, and after detonation of the explosive, an explosive load is mainly applied to the upper surface of the beam member 100; in addition, the explosive loads with different proportional explosion distances can be obtained by changing the mass of the explosive, and different sizes of explosion effects are exerted.
S3, collecting tensile strain data monitored by each resistance strain gage 2 at different moments when the beam-type component 100 is under the action of explosive load through a data collecting and analyzing deviceiAnd the vertical displacement monitored by each displacement sensor 3, for subsequent known elastic modulus E with the round tie rod 14sA known cross-sectional area a and a known distance D of the axis of each round tie rod 14 from the neutral planeiAnd calculating and statistically analyzing to obtain longitudinal total constraint force data N and total resisting bending moment data M which are provided by all the circular pull rods 14 for the beam-type member 100 at different moments, so as to obtain the surface force corresponding to the vertical displacement of the beam-type member 100 at different moments under the action of the explosive load and the deflection-time relation of the beam-type member 100 under the action of the explosive load and the surface force effect, and quantitatively judge the influence of the surface force effect on the anti-explosion bearing capacity of the beam-type member, so that the bearing capacity of the beam-type member 100 can be reasonably utilized, the engineering anti-explosion design can be correctly guided, and the manufacturing materials and the manufacturing cost can be saved.
In the embodiment of the present invention, in step S3, the longitudinal total constraint force data N and the total resisting bending moment data M may be obtained by calculation based on a stress-strain relationship of Hooke' S (Hooke) law, specifically:
from bottom to top, the longitudinal restraining force provided by each two symmetrical round tie rods 14:
Ni＝2iEsa formula (1);
total longitudinal restraint provided by all round tie rods 14:
N＝∑Niformula (2);
from bottom to top, each two symmetrical round tie rods 14 provide a bending moment resistance:
Mi＝2iEsADiformula (3);
the total resistance bending moment provided by all round tie rods 14:
M＝∑Miformula (4);
substituting formula (1) into formula (2) can obtain the total longitudinal restraining force N provided by all the round pull rods 14, substituting formula (3) into formula (4) can obtain the total resisting bending moment M provided by all the round pull rods 14, wherein EsIs the modulus of elasticity of the round tie rod 14, A is the cross-sectional area of the round tie rod 14, DiThe distance between the axis of the circular tie rod 14 and the neutral plane, is a known quantity,ii is 1, 2, 3.
The number of the circular pull rods 14 symmetrically arranged at the two transverse sides of the beam-type member 100 is three, and the axes of the circular pull rods 14 positioned at the top are coincided with the neutral plane (namely D)30) and the axial distances between every two vertical adjacent round pull rods 14 are D (namely D)1＝2d，D2D) for example, the total longitudinal restraining force N provided by all the round tie rods 14 is N1+N2+N3＝2(1+2+3)EsA; the total resisting bending moment M ═ N provided by all the round tie rods 141·D1+N2·D2＝2EsAd(21+2)。
Alternatively, in step S2, the sampling frequency of the data acquisition device may be adjusted, for exampleIf every 0.001 millisecond, a tensile strain data detected by the corresponding resistance strain gauge 2 is collectediFor calculation, collecting a vertical displacement data detected by the displacement sensor 3, and automatically recording the deflection corresponding to different moments, thereby obtaining a deflection-time relation curve of the beam-type member 100 in the test process.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. Anti blast effect test device of beam member based on face force effect, its characterized in that includes:
the surface force loading mechanism comprises cushion blocks, clamping plates, a plurality of rolling shafts and a plurality of circular pull rods, wherein the cushion blocks are respectively attached to the parts, located below a neutral surface, of the two longitudinal end surfaces of the beam-type member, the clamping plates are longitudinally opposite to the cushion blocks, the rolling shafts are located between the cushion blocks and the clamping plates, the circular pull rods are symmetrically arranged on the two transverse sides of the beam-type member and are vertically distributed at intervals along the parts, located below the neutral surface, opposite wall surfaces of the cushion blocks and the clamping plates are respectively provided with opposite horizontal grooves for the local clamping of the rolling shafts, and the two ends of all the circular pull rods are respectively connected with the clamping plates, so that the cushion blocks are;
the resistance strain gauges are respectively arranged on the circular pull rods on at least one side of the beam-type member in the transverse direction and used for monitoring tensile strain data of the circular pull rodsi；
The displacement sensors are arranged right below the beam-type component and distributed at intervals in the longitudinal direction and are used for monitoring the vertical displacement of different parts of the beam-type component; and the data acquisition device is used for acquiring tensile strain data monitored by each resistance strain gauge at different moments when the beam member is subjected to combined action of explosive load and surface forceiAnd each displacement sensor monitorMeasured vertical displacement data for subsequent known elastic modulus E of round tie rodsKnown cross-sectional area A and known distance D between the axis of each round tie rod and the neutral planeiAnd calculating and statistically analyzing to obtain longitudinal total constraint force data N and total resisting bending moment data M which are provided for the beam type member by all the circular pull rods at different moments so as to obtain the surface force corresponding to the vertical displacement of the beam type member at different moments under the action of the explosive load and the deflection-time relation of the beam type member under the action of the explosive load and the surface force effect.
2. The surface force effect based beam member explosion resistance test device as claimed in claim 1, wherein: the position that the splint of both sides correspond circular pull rod is equipped with the via hole, and the periphery of the tip of circular pull rod is equipped with the external screw thread, and the tip of circular pull rod passes behind the via hole and connects with the nut soon.
3. The surface force effect based beam member explosion resistance test device as claimed in claim 1, wherein: the diameter of the rolling shaft is matched with the horizontal grooves in the cushion blocks and the clamping plates, and the cross sections of the horizontal grooves are minor arcs and are respectively used for the local clamping of the rolling shaft.
4. The surface force effect based beam member explosion resistance test device as claimed in claim 1, wherein: the number of the rolling shafts is consistent with that of the round pull rods, and the extension lines of the axes of the rolling shafts are preferably perpendicular to the round pull rods.
5. The surface force effect based beam member explosion resistance test device as claimed in claim 1, wherein: the beam member is horizontally erected on two rigid buttresses which are horizontally arranged at intervals, two ends of each rigid buttress are supported by a rigid support at the top of each buttress, each rigid buttress is fixed on a rigid ground, a rigid cross beam is further connected between the two rigid buttresses, a plurality of displacement sensors are arranged at positions of the rigid cross beams right below the beam member, and the rigid buttresses are uniformly distributed from the position corresponding to the center of the beam member to one of the rigid buttresses at intervals.
6. The surface force effect based beam member explosion resistance test device as claimed in claim 1, wherein: the number of the circular pull rods symmetrically arranged on the two transverse sides of the beam-type member is three, the axis of the circular pull rod positioned on the top coincides with the neutral plane, and the axial distance between every two vertical adjacent circular pull rods is d.
7. The surface force effect based beam member explosion resistance test device as claimed in claim 1, wherein: the system further comprises a calculating and analyzing device, wherein the calculating and analyzing device is used for calculating the stress-strain relation based on Hooke's law, obtaining longitudinal total constraint force data N and total resisting bending moment data M, and obtaining the deflection-time relation of the beam type component under the explosive load and the surface force effect.
8. A test method of an explosion-proof test device for a beam member based on surface force effect according to any one of claims 1 to 7, comprising the steps of:
s1, arranging a test device, and arranging explosive at a certain height right above the beam-type member;
s2, detonating the explosive to apply explosive load to the upper surface of the beam-type component;
s3, collecting tensile strain data monitored by each resistance strain gauge at different moments when the beam member is under the action of explosive load through a data collection and analysis deviceiAnd the vertical displacement monitored by each displacement sensor, so as to provide the elastic modulus E known by the following and round pull rodssKnown cross-sectional area A and known distance D between the axis of each round tie rod and the neutral planeiCalculating and statistically analyzing to obtain longitudinal total constraint force data N and total resisting bending moment data M which are provided for the beam type member by all the round pull rods at different moments so as to obtain the surface force corresponding to the vertical displacement of the beam type member at different moments under the action of the explosive load and the deflection-time of the beam type member under the action of the explosive load and the surface force effectAnd (4) relationship.
9. The assay of claim 8, wherein: in step S3, the longitudinal total constraint force data N and the total resistance bending moment data M are obtained by calculation based on the stress-strain relationship of hooke' S law, specifically:
from bottom to top, the longitudinal restraining force provided by each two symmetrical round pull rods:
Ni＝2iEsa formula (1);
total longitudinal restraint provided by all round tie rods:
N＝∑Niformula (2);
from bottom to top, the resistance bending moment that every two symmetrical round pull rods provided is:
Mi＝2iEsADiformula (3);
the total resistance bending moment provided by all round tie rods 14:
M＝∑Miformula (4);
the total longitudinal restraining force N provided by all the circular pull rods can be obtained by substituting the formula (1) into the formula (2), and the total resisting bending moment M provided by all the circular pull rods can be obtained by substituting the formula (3) into the formula (4), wherein i is 1, 2, 3.
10. The test method according to claim 8 or 9, characterized in that: in step S3, the acquisition device acquires tensile strain data detected by the corresponding resistance strain gauge every 0.001 msiAnd collecting a vertical displacement data detected by the displacement sensor.
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