CN113123474A - Subway station platform post subtracts and explodes structure based on ripple sandwich panel - Google Patents

Subway station platform post subtracts and explodes structure based on ripple sandwich panel Download PDF

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Publication number
CN113123474A
CN113123474A CN202110263020.8A CN202110263020A CN113123474A CN 113123474 A CN113123474 A CN 113123474A CN 202110263020 A CN202110263020 A CN 202110263020A CN 113123474 A CN113123474 A CN 113123474A
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corrugated sandwich
plate
equal
explosion
panel
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CN113123474B (en
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师燕超
丁阳
胡晔
郭明
郭宗明
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Tianjin University
Shenzhen Municipal Design and Research Institute Co Ltd
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Tianjin University
Shenzhen Municipal Design and Research Institute Co Ltd
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/92—Protection against other undesired influences or dangers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • B32B15/011—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of iron alloys or steels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/28—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer comprising a deformed thin sheet, i.e. the layer having its entire thickness deformed out of the plane, e.g. corrugated, crumpled
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/30—Columns; Pillars; Struts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2419/00—Buildings or parts thereof

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Buildings Adapted To Withstand Abnormal External Influences (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Abstract

The invention discloses a subway station platform column explosion suppression structure based on corrugated sandwich plates, wherein the station platform column is arranged between an upper floor plate and a lower floor plate, the explosion suppression structure comprises the corrugated sandwich plates arranged on the outer surface of the station platform column, the corrugated sandwich plates are provided with four blocks, the four corrugated sandwich plates are respectively arranged on the outer surface of the corresponding station column, and two adjacent corrugated sandwich plates are connected into a whole through a longitudinal connecting piece; the upper end of the longitudinal connecting piece is connected with the upper floor slab, and the lower end of the longitudinal connecting piece is connected with the lower floor slab. The invention adopts the metal periodic material sandwich plate as a protective component, and the sandwich material absorbs energy under the action of explosive load, thereby achieving ideal protective effect.

Description

Subway station platform post subtracts and explodes structure based on ripple sandwich panel
Technical Field
The invention relates to a construction component engineering protection technology, in particular to a subway station platform column explosion-reducing structure based on a corrugated sandwich plate.
Background
Urban transportation hubs such as subways have the characteristics of dense personnel during operation, relatively closed indoor space, high construction and maintenance cost and the like, and in recent years, subway explosion cases frequently occur. Once terrorist explosion attacks occur in urban transportation hubs such as subways and the like, a large number of casualties can be caused, structural members of a building can be damaged and destroyed, and even the structure can be collapsed continuously. It is necessary to study the protection measures of the main load-bearing members of the structure and the reinforced concrete columns which are easily subjected to attack.
The method for improving the anti-explosion performance of the component by adding protective measures mainly comprises two methods of anti-explosion and anti-explosion: common anti-explosion measures such as steel plate wrapping, high-strength fabric sticking outside, composite material spraying and the like, the reinforced component directly bears the explosion load, the protection effect on the close-range large-equivalent explosive is not obvious enough, and the component can be regarded as a passive protection measure; common explosion reduction protective measures such as an explosion-proof steel plate, polymer foam, a foamed aluminum sandwich plate and the like indirectly bear explosion load through an energy absorption component of the explosion reduction measures, have more advantages for short-distance large-equivalent explosive protection, can be regarded as an 'active' protective measure, and are more popular because of quick replacement and recovery and certain decoration, such as a Tianjin subway No. 6 line and Nanjing subway No. 1, adopt the explosion-proof steel plate to protect a subway station structural column.
Therefore, the prior art has the problems that: (1) the existing anti-explosion measures such as steel plate wrapping, high-strength fabric sticking outside, composite material spraying and the like have the advantages that the reinforced component still directly bears the explosion load, the protection effect on the short-distance large equivalent load is not obvious, and the surface treatment process is complex; (2) although the existing explosion reduction protection measures such as polyurethane foam, foamed aluminum sandwich plates and the like indirectly bear the explosion load, the protection effect is still not good enough because the core layer material has limited energy absorption; (3) the explosion-proof steel plate applied to the subway can be torn and damaged under the condition of large equivalent load due to the fact that the steel plate is thin, and the column damage can be aggravated due to the combined effect of shock waves and fragment penetration; (4) the existing installation mode is that the keel is connected with the column body, and the reinforced concrete column still can directly receive partial load.
The sandwich plate made of periodic materials such as the corrugations and the like is widely applied to the fields of aviation, ships and oceans due to high specific strength and specific rigidity and good anti-explosion performance, is less applied to the field of building protection, and has high research and application values.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a subway station platform column explosion-reducing structure based on a corrugated sandwich plate.
The technical scheme adopted by the invention is as follows: a subway station platform column explosion suppression structure based on corrugated sandwich plates comprises four corrugated sandwich plates arranged on the outer surface of a station platform column, wherein the four corrugated sandwich plates are respectively arranged on the outer surface of the corresponding platform column, and two adjacent corrugated sandwich plates are connected into a whole through a longitudinal connecting piece; the upper end of the longitudinal connecting piece is connected with the upper floor slab, and the lower end of the longitudinal connecting piece is connected with the lower floor slab.
Further, the corrugated sandwich plate adopts a triangular corrugated sandwich plate.
Further, the triangular corrugated sandwich plate and the station pillar are arranged at a distance or in direct contact.
Further, the distance is greater than 0mm and equal to or less than 70 mm.
Further, under the explosion of a close-distance backpack bomb, the parameters of the triangular corrugated sandwich plate are as follows: the plate thickness ratio of the face plate to the core plate is more than or equal to 1 and less than or equal to 3; the cell width is more than or equal to 15mm and less than or equal to 60 mm; the thickness of the interlayer is not less than 15mm and not more than 45 mm.
Further, when the 5kg explosive equivalent is used for the next-stage protection, the thickness of the panel of the triangular corrugated sandwich plate is more than or equal to 4mm and less than or equal to 8mm, and when the 5kg explosive equivalent is used for the second-stage protection, the thickness of the panel of the triangular corrugated sandwich plate is more than or equal to 2mm and less than or equal to 3 mm;
when the 10kg explosive equivalent is used for the next-stage protection, the thickness of the panel of the triangular corrugated sandwich plate is more than or equal to 6mm and less than or equal to 8mm, and when the 10kg explosive equivalent is used for the second-stage protection, the thickness of the panel of the triangular corrugated sandwich plate is more than or equal to 4mm and less than or equal to 5 mm;
the panel thickness of the triangular corrugated sandwich plate is more than or equal to 6mm and less than or equal to 8mm under 15kg of explosive equivalent for secondary protection, and is more than or equal to 3mm and less than or equal to 5mm under 15kg of explosive equivalent for tertiary protection;
and when the secondary protection is carried out under the explosive equivalent of 20kg, the thickness of the panel of the triangular corrugated sandwich plate is 8mm, and when the tertiary protection is carried out under the explosive equivalent of 20kg, the thickness of the panel of the triangular corrugated sandwich plate is more than or equal to 4mm and less than or equal to 7 mm.
Further, the corrugated sandwich plate is a hollow sandwich plate.
Further, the hollow sandwich plate is arranged in direct contact with the platform column.
Further, the corrugated sandwich plate adopts a circular corrugated sandwich plate.
Further, the longitudinal connector is not connected with the platform post.
The invention has the beneficial effects that:
(1) the sandwich plate made of periodic materials such as the corrugations and the like is widely applied to the fields of aviation, ships and oceans due to high specific strength and specific rigidity and good anti-explosion performance, is less applied to the field of building protection, and has high research and application values.
(2) The installation of the corrugated sandwich plate on the structural member is optimized in terms of its energy absorption properties.
Drawings
FIG. 1 is a main flow chart of the present invention
FIG. 2a is a schematic view (front view) of the installation of a corrugated sandwich plate
FIG. 2b is a schematic view (top view) of the installation of the corrugated sandwich plate
FIG. 3 is a diagram of the explosion-reducing mechanism of the corrugated sandwich plate
FIG. 4 is a schematic view of the construction parameters of a triangular corrugated sandwich panel
FIG. 5a1 is a non-invasive cloud picture of protective column (front view)
FIG. 5a2 is a non-invasive cloud picture of protective column (top view)
FIG. 5b1 is a cloud picture of protective pole slight damage (front view)
FIG. 5b2 is a cloud picture of protective column with slight damage (top view)
FIG. 5c1 is a cloud picture of protective pole with moderate damage (front view)
FIG. 5c2 is a cloud picture of protective column with moderate damage (top view)
FIG. 5d1 is a cloud picture of severe damage of protective column (front view)
FIG. 5d2 is a cloud picture of severe injury of protective column (top view)
FIG. 5e1 is a cloud view (front view) of the damage increase of the protection pillar
FIG. 5e2 is a cloud picture of damage increase of the protection pillar (top view)
The attached drawings are marked as follows:
1-standing pillar; 2-corrugated sandwich plate;
3-longitudinal connecting piece; 4-triangular corrugated sandwich plate;
41-front panel; 42-core plate;
43-back panel.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
as shown in fig. 1, an explosion-reducing structure of a subway station pillar 1 based on a corrugated sandwich plate 2 comprises the following steps: (10) installing the corrugated sandwich plate 2: the corrugated sandwich plate 2 mainly comprises a front panel, a core panel and a back panel, and four sandwich forms including a triangular corrugated sandwich plate 4, a circular corrugated sandwich plate, a hollow sandwich plate and a steel plate are selected. (20) And (3) parameter calculation: and (3) revealing the explosion-reducing mechanism of the corrugated sandwich plate 2, and calculating the influence of the installation mode of the sandwich plate, the sandwich form and the plate-column spacing on the protection effect. (30) Optimizing and designing: aiming at the triangular corrugated sandwich plate 4 with relatively good protection effect, the structural parameters such as the plate thickness ratio of the panel and the core plate 42, the cell element width b, the interlayer thickness t and the like are optimized on the premise of ensuring that the steel consumption of the sandwich plate is not changed, wherein the plate thickness ratio of the panel and the core plate 42 is the ratio of the panel thickness to the core plate 42 thickness, and the thickness of the front panel 41 is equal to that of the back panel 43; dividing the protection grade of the protection column; and (4) the construction parameter suggestions of the triangular corrugated sandwich plate 4 required by different protection grade of the protection column under different explosive equivalent weights are given.
As shown in fig. 2a and 2b, the installation step of the corrugated sandwich panel 2: two adjacent corrugated sandwich plates 2 are welded into a whole through a longitudinal connecting piece 3, the upper end of the longitudinal connecting piece 3 is connected with an upper floor slab, and the lower end of the longitudinal connecting piece 3 is connected with a lower floor slab. And no keel is arranged between the plate columns, so that sufficient deformation space of the sandwich plate is ensured.
As shown in fig. 3, when the blast shock wave propagates to the face plate of the corrugated sandwich plate 2, the face plate is not damaged due to the higher steel ultimate strength, the blast shock wave is reflected on the surface of the face plate, and meanwhile, the explosion-facing region of the corrugated sandwich plate 2 is bent and deformed to impact the structural column, so that an explosion pit appears near the explosion-facing region, and the front face plate, the core plate and the back face plate are almost completely compressed together. In the process, the steel plate is subjected to plastic deformation to absorb most energy of shock waves, a small part of energy is converted into kinetic energy of the corrugated sandwich plate 2 to impact the column, the front side of the column body in the explosion-facing area is subjected to the impact effect of the steel plate to be subjected to compression damage, and the back side of the column body is subjected to tensile damage. The reason why the peak value of the air reflection overpressure at the surface of the column is reduced from unprotected 135MPa to protected 1MPa, the air overpressure being higher than ambient pressure is due to the fact that the corrugated sandwich panel 2 compresses the air in front of the column from rest to a higher velocity in a very short time, but its effect is negligible with respect to the impact effect. The protection mechanism of the corrugated sandwich plate 2 is realized by changing the type of load borne by the column, namely, the explosive blast load action under the condition of no protection is changed into the impact action of the sandwich plate under the protection, and the aim of explosion reduction is achieved by absorbing energy and reducing the propagation of tensile stress waves in concrete through the plastic deformation of the steel plate.
As shown in table 1, five mounting manners of the corrugated sandwich panel 2 were devised. Installation mode 1: keels are arranged on the surface of the platform column 1, the keels comprise longitudinal keels and transverse keels, the longitudinal keels are arranged at four corners of the platform column 1, the transverse keels are arranged in multiple rows and are longitudinally arranged at intervals, the corrugated sandwich plate 2 is connected with the platform column 1 through the keels, and longitudinal connecting pieces 3 are not arranged; installation mode 2: arranging keels according to the mode 1, connecting the corrugated sandwich plate 2 with the keels, and welding the corrugated sandwich plate 2 into a whole through a longitudinal connecting piece 3; installation mode 3: the installation mode is the same as the mode 2, and the distance between the transverse keels is increased; installation mode 4: the installation mode is the same as the installation mode 2, the size of the transverse keel is reduced, and the transverse keel is not in contact with the platform column 1; installation mode 5: the corrugated sandwich plate 2 is welded into a whole through the longitudinal connecting piece 3 without a keel, and the upper end and the lower end of the longitudinal connecting piece 3 are connected with a floor slab. Wherein, the size of the longitudinal connecting piece 3 is equal to the thickness of the sandwich layer of the corrugated sandwich plate 2, and the thickness of the longitudinal connecting piece 3 is equal to that of the steel plate of the keel.
Table 1 mounting design
Figure BDA0002970858080000051
In order to evaluate the protection effect of the corrugated sandwich plate 2, the invention establishes a protection effect coefficient expression:
Figure BDA0002970858080000052
wherein S is the coefficient of protective effect (S)<1)；δaIs the displacement peak value of the unprotected column; deltabTo protect the post displacement peak.
As shown in tables 2a to 2d, the effect of the mounting form at explosive equivalent weights of 5, 10, 15 and 20kg on the shielding effect of the corrugated sandwich panel 2. Under 5kg explosive equivalent, corrugated sandwich plate 2 does not play the guard action under mounting means 1, and 2 protective effect of corrugated sandwich plate are relatively poor under mounting means 3, and 2 protective effect of corrugated sandwich plate are better under mounting means 5, compare 3 protective effect coefficients increases 70% of mode. 10. Under 15 and 20kg explosive equivalent, corrugated sandwich plate 2 all does not play the guard action under mounting means 1, 2 protective effect of corrugated sandwich plate are relatively poor under mounting means 2, 2 protective effect of corrugated sandwich plate are better under mounting means 5, compare 2 protective effect coefficients of mode increase 30%, 37% respectively and 29%, show not increase fossil fragments and guarantee the sufficient deformation space of corrugated sandwich plate 2 in the board post interval, be favorable to improving the protective effect.
TABLE 2a influence of the installation form under 5kg explosive equivalent on the protective effect of the corrugated sandwich panel 2
Figure BDA0002970858080000061
TABLE 2b Effect of installation form under explosive equivalent of 10kg on the protective effect of the corrugated sandwich panel 2
Figure BDA0002970858080000062
TABLE 2c Effect of installation form on the protective effect of corrugated sandwich panel 2 under 15kg explosive equivalent
Figure BDA0002970858080000063
TABLE 2d Effect of installation form on the protective effect of corrugated sandwich plate 2 under 20kg explosive equivalent
Figure BDA0002970858080000071
In conclusion, the reasonable installation mode of the sandwich plate is as follows: the four corrugated sandwich plates 2 are respectively arranged on the outer surfaces of the corresponding station posts 1, two adjacent corrugated sandwich plates 2 are welded into a whole through a longitudinal connecting piece 3, the upper end of the longitudinal connecting piece 3 is connected with an upper floor, the lower end of the longitudinal connecting piece 3 is connected with a lower floor, and the longitudinal connecting piece 3 is not connected with the station posts 1; no keel is arranged between the corrugated sandwich plate 2 and the platform column 1, so that a sufficient deformation space of the sandwich plate is ensured.
As shown in tables 3a to 3d, the protective effect of the corrugated sandwich panels 2 of different sandwich forms when the columns of panels are in contact under 5, 10, 15 and 20kg explosive equivalent: the circular corrugated sandwich plate has poor protection effect, the hollow sandwich plate has good protection effect, and the steel plate protection effect coefficient is respectively increased by 139%, 28%, 36% and 93%. When the plate columns are contacted, the first hollow interlayer and the second triangular interlayer of the interlayer form of the corrugated interlayer plate 2 are determined.
Table 3a influence of the protective effect of the corrugated sandwich plate 2 of different sandwich forms on contact of the plate and the column under 5kg explosive equivalent
Figure BDA0002970858080000072
Table 3b influence of the protective effect of corrugated sandwich panels 2 of different sandwich forms on contact of the columns and plates under an explosive equivalent of 10kg
Figure BDA0002970858080000081
Table 3c influence of protective effect of corrugated sandwich plate 2 of different sandwich forms upon contact of the plate and column under 15kg explosive equivalent
Figure BDA0002970858080000082
TABLE 3d Effect of the protective effect of the corrugated sandwich plate 2 of different sandwich forms on the contact of the plate and the column under 20kg explosive equivalent
Figure BDA0002970858080000083
As shown in tables 4a to 4d, the protective effect of the corrugated sandwich panels 2 of different sandwich forms at a distance of 40mm between the panels in an explosive equivalent of 5, 10, 15 and 20 kg: under 5kg explosive equivalent, the steel sheet protective effect is relatively poor, and the 4 protective effects of triangle-shaped ripple sandwich panel are better to steel sheet protective effect coefficient increases 83% for the reference. 10. Under 15kg explosive equivalent, the protection effect of circular ripple sandwich panel is relatively poor, and the protection effect of triangle-shaped ripple sandwich panel 4 is better to steel sheet protection effect coefficient increases 30%, 16% for the reference. Under 20kg explosive equivalent, the protection effect of circular ripple sandwich panel is relatively poor, and the protection effect of triangle-shaped ripple sandwich panel 4 is better to steel sheet protection effect coefficient increases 21% for the reference. Triangular corrugations are preferred when the interlayer form of the sandwich plate is determined when the plate-column distance is 40 mm.
TABLE 4a influence of the protective effect of the corrugated sandwich plate 2 of different sandwich forms at a plate-column spacing of 40mm under an explosive equivalent of 5kg
Figure BDA0002970858080000091
Table 4b influence of the protective effect of the corrugated sandwich plate 2 of different sandwich forms at a distance of 40mm between the lower columns in an explosive equivalent of 10kg
Figure BDA0002970858080000092
TABLE 4c influence of the protective effect of the corrugated sandwich plate 2 of different sandwich forms at a plate-column spacing of 40mm under an explosive equivalent of 15kg
Figure BDA0002970858080000093
TABLE 4d Effect of the protective effect of the corrugated sandwich plate 2 of different sandwich forms at a distance of 40mm between the lower columns at an explosive equivalent of 20kg
Figure BDA0002970858080000094
As shown in tables 5a to 5d, the protective effect of the corrugated sandwich panels 2 of different sandwich forms at a distance of 70mm between the panels for 5, 10, 15 and 20kg explosive equivalents: under 5kg explosive equivalent, the protection effect of cavity intermediate layer sandwich panel is relatively poor, and the protection effect of triangle-shaped ripple sandwich panel 4 is better to steel sheet protection effect coefficient increases 10% for the reference. 10. Under the equivalent of 15kg of explosive, the steel plate has poor protection effect, the triangular corrugated sandwich plate 4 has good protection effect, and the protection effect coefficients are respectively increased by 91% and 63%. Under 20kg explosive equivalent, the protection effect of cavity intermediate layer sandwich panel is relatively poor, and the protection effect of triangle-shaped ripple sandwich panel 4 is better to steel sheet protection effect coefficient increases 48% for the reference. The triangular corrugated sandwich plate 4 is preferred when the sandwich plate type is determined when the plate-column spacing is 70 mm.
TABLE 5a influence of the protective effect of corrugated sandwich panels 2 of different sandwich forms at a plate-column spacing of 70mm under an explosive equivalent of 5kg
Figure BDA0002970858080000101
TABLE 5b Effect of the protective effect of the corrugated sandwich plate 2 of different sandwich forms at a plate-column spacing of 70mm under an explosive equivalent of 10kg
Figure BDA0002970858080000102
TABLE 5c influence of the protective effect of the corrugated sandwich plate 2 of different sandwich forms at a plate-column spacing of 70mm under an explosive equivalent of 15kg
Figure BDA0002970858080000103
TABLE 5d Effect of the protective effect of the corrugated sandwich plate 2 of different sandwich forms at a distance of 70mm between the plates in an explosive equivalent of 20kg
Figure BDA0002970858080000111
In conclusion, the sandwich form of the corrugated sandwich panel 2 determines: by taking the protection effect of the equal-mass steel plate as a reference, the protection effect of the triangular corrugated sandwich plate 4 is relatively good, the reasonable plate-column distance is more than or equal to 0mm and less than or equal to 70mm, preferably 40mm, and when the plate-column distance is 0mm, the triangular corrugated sandwich plate 4 is in direct contact with the platform column 1; the protective effect of the hollow sandwich plate is inferior, and the reasonable plate-column distance is direct contact.
As shown in fig. 4, aiming at the triangular corrugated sandwich plate 4 with relatively good protection effect, the structural parameters of the triangular corrugated sandwich plate 4 are optimized on the premise of ensuring that the steel consumption of the sandwich plate is unchanged, and the main design parameters of the triangular corrugated sandwich plate are as follows: the thickness of the front panel 41, the thickness of the core 42, the thickness of the back panel 43, the cell width b, the interlayer thickness t, the included angle α, and the like.
As shown in tables 6a to 6d, the different sheet thicknesses at 5, 10, 15 and 20kg explosive equivalents have a protective effect on the triangular corrugated sandwich panel 4: under the condition of 5kg explosive equivalent, the displacement response of the protective column is very small, which indicates that the explosive load is hardly transmitted to the column; the protection effect of the triangular corrugated sandwich plate 4 is poor when the plate thickness ratio is 1, the protection effect of the triangular corrugated sandwich plate 4 is good when the plate thickness ratio is 3, and the protection effect coefficient is increased by 17% when the plate thickness ratio is 1. 10. Under the explosive equivalent of 15kg and 20kg, the displacement response of the protective column is increased, which shows that part of explosive load is transmitted to the column through the impact action of the triangular corrugated sandwich plate 4; the protection effect of the triangular corrugated sandwich plate 4 is poor when the plate thickness ratio is 4, the protection effect of the triangular corrugated sandwich plate 4 is good when the plate thickness ratio is 2, and the protection effect coefficients are respectively increased by 27%, 11% and 13% when the plate thickness ratio is 4. Therefore, when the plate thickness ratio of 5kg of explosive equivalent is 1, the protection effect of the triangular corrugated sandwich plate 4 is not good, when the plate thickness ratio of 10-20 kg of explosive equivalent is 4, the protection effect of the triangular corrugated sandwich plate 4 is not good, and when the explosive equivalent is increased from 5kg to 10kg, the protection effect coefficient of the triangular corrugated sandwich plate 4 is obviously reduced, because the triangular corrugated sandwich plate 4 generates the impact action. On the premise that the amount of steel used for the triangular corrugated sandwich panel 4 is not changed, the plate thickness ratio of the face plate to the core plate 42 is not less than 1 and not more than 3, preferably 2.
TABLE 6a influence of different plate thickness ratios on the protective effect of the triangular corrugated sandwich plate 4 under 5kg explosive equivalent
Figure BDA0002970858080000121
TABLE 6b influence of different sheet thickness ratios on the protective effect of the triangular corrugated sandwich panel 4 under the explosive equivalent of 10kg
Figure BDA0002970858080000122
TABLE 6c influence of different plate thickness ratios on the protective effect of the triangular corrugated sandwich plate 4 under 15kg explosive equivalent
Figure BDA0002970858080000123
TABLE 6d influence of different plate thickness ratios on the protective effect of the triangular corrugated sandwich plate 4 under 20kg explosive equivalent
Figure BDA0002970858080000124
As shown in tables 7a to 7d, the triangular corrugated sandwich panel 4 was protected by different cell widths at 5, 10, 15 and 20kg explosive equivalent: under 5kg explosive equivalent, the protection effect of triangular corrugated sandwich plate 4 is relatively poor when the cell width is 15mm, the protection effect of triangular corrugated sandwich plate 4 is relatively good when the cell width is 30mm, and the protection effect coefficient is increased by 16% when comparing the cell width to 15 mm. 10. Under 15 and 20kg explosive equivalent, the protection effect of the triangular corrugated sandwich plate 4 is poor when the cell width is 120mm, the protection effect of the triangular corrugated sandwich plate 4 is good when the cell width is 30mm, and compared with the protection effect coefficient increased by 56%, 27% and 39% when the cell width is 120 mm. Therefore, the protection effect of the triangular corrugated sandwich plate 4 is not good when the width of the cell element is 15mm under the explosive equivalent of 5kg, and the protection effect of the triangular corrugated sandwich plate 4 is not good when the width of the cell element is 120mm under the explosive equivalent of 5-20 kg. Under the premise that the amount of steel used for the triangular corrugated sandwich plate 4 is not changed, the width of the cell element is more than or equal to 15mm and less than or equal to 60mm, preferably 30 mm.
TABLE 7a influence of different cell widths on the protection effect of the triangular corrugated sandwich panel 4 under 5kg explosive equivalent
Figure BDA0002970858080000131
TABLE 7b Effect of different cell widths on the protection of the triangular corrugated sandwich panel 4 under the explosive equivalent of 10kg
Figure BDA0002970858080000132
TABLE 7c influence of different cell widths on the protective effect of the triangular corrugated sandwich panel 4 under 15kg explosive equivalent
Figure BDA0002970858080000133
TABLE 7d Effect of different cell widths on the protection effect of the triangular corrugated sandwich panel 4 under 20kg explosive equivalent
Figure BDA0002970858080000134
As shown in tables 8a to 8d, different interlayer thicknesses at 5, 10, 15 and 20kg explosive equivalents have a protective effect on the triangular corrugated sandwich panel 4: under 5kg explosive equivalent, 4 protective effect of triangle-shaped ripple sandwich panel are relatively poor when intermediate layer thickness is 15mm, and 4 protective effect of triangle-shaped ripple sandwich panel are better when intermediate layer thickness is 45mm, compare protective effect coefficient increase 30% when intermediate layer thickness is 15 mm. 10. Under 15kg explosive equivalent, the protection effect of triangular corrugated sandwich plate 4 is relatively poor when intermediate layer thickness is 60mm, and the protection effect of triangular corrugated sandwich plate 4 is better when intermediate layer thickness is 30mm, compares that the protection effect coefficient increases 40%, 51% respectively when intermediate layer thickness is 60 mm. Under 20kg explosive equivalent, 4 protective effect of triangle-shaped ripple sandwich panel are relatively poor when intermediate layer thickness is 60mm, and 4 protective effect of triangle-shaped ripple sandwich panel are better when intermediate layer thickness is 15mm, compare protective effect coefficient increase 53% when intermediate layer thickness is 60 mm. Therefore, the protection effect of the triangular corrugated sandwich plate 4 with the interlayer thickness of 15mm under the explosive equivalent of 5kg is poor, and the protection effect of the triangular corrugated sandwich plate 4 with the interlayer thickness of 60mm under the explosive equivalent of 10-20 kg is poor. On the premise that the steel amount of the triangular corrugated sandwich plate 4 is not changed, the thickness of the sandwich layer is more than or equal to 15mm and less than or equal to 45mm, and preferably 30 mm.
TABLE 8a influence of different interlayer thicknesses on the protective effect of the triangular corrugated sandwich panel 4 under 5kg explosive equivalent
Figure BDA0002970858080000141
TABLE 8b Effect of different interlayer thicknesses on the protective Effect of triangular corrugated sandwich plate 4 under explosive equivalent of 10kg
Figure BDA0002970858080000142
TABLE 8c influence of different interlayer thicknesses on the protective effect of the triangular corrugated sandwich panel 4 under an explosive equivalent of 15kg
Figure BDA0002970858080000151
TABLE 8d Effect of different interlayer thicknesses on the protective effect of the triangular corrugated sandwich panel 4 under 20kg explosive equivalent
Figure BDA0002970858080000152
As shown in fig. 5a1 to 5e2, the protection classification should be performed according to the damage degree of the protection pillars, and the damage degree is classified into the following five types by summarizing the damage forms of the protection pillars: (1) the protective columns are not damaged, the overall bending deformation of the triangular corrugated sandwich plate 4 is small, and the core layer is hardly damaged (fig. 5a1 and 5a 2); (2) the concrete in the explosion facing area and the columns along the height is damaged slightly, and the whole bending deformation of the triangular corrugated sandwich plate 4 is increased (fig. 5b1 and 5b 2); (3) the concrete in the middle of the explosion facing area and the columns along the height is moderately damaged, the concrete on the front side of the explosion facing area is degraded and damaged, the back plate of the triangular corrugated sandwich plate 4 is acted by the reinforced concrete column, the deformation space is limited, the core layer is warped and compressed, the whole body presents relatively obvious local deformation, and explosion pits are formed near the explosion facing area (fig. 5c1 and 5c 2); (4) the concrete in the middle of the explosion-facing area and the columns along the height is seriously damaged, the concrete on the front side of the explosion-facing area is degraded and damaged, the area of the spalling area is increased along with the development of an inclined crack, the shearing damage appears near the column cap, the front panel 41, the core panel 42 and the back panel 43 of the triangular corrugated sandwich panel 4 are almost completely compressed together, the core layer is seriously damaged, and the edge is seriously deformed and partially damaged (figures 5d1 and 5d 2); (5) the damage degree of the column body is increased compared with that of the column body without protection, the shearing damage is generated near the column head, the complete tearing damage is generated in the explosion facing area of the triangular corrugated sandwich plate 4, the damage of the protection column is increased under the combined action of fragments and explosion shock waves, and the triangular corrugated sandwich plate 4 does not play a protection effect (fig. 5e1 and 5e2) generally caused by the fact that the steel plate is too thin.
As shown in table 9, the protection classification presupposes that the triangular corrugated sandwich panel 4 has a protection effect, and the design of the fifth case (fig. 5e1 and 5e2) should be avoided as much as possible, and the first four damage degrees are sequentially classified into one-level to four-level protection. After the terrorist explosion attacks, the rapid repair can be realized only by replacing the triangular corrugated sandwich plate 4 facing the explosion surface during the primary protection, the rapid repair can still be realized without obvious peeling damage of concrete during the secondary protection, and the proper reinforcement measures are required for repairing after the concrete peeling damage of the front surface of the column body during the tertiary protection.
TABLE 9 protective column protection level division
Figure BDA0002970858080000161
As shown in table 10, the following panel thickness selection recommendations are provided according to the protection grade requirements of the protection column: (1)5kg explosive equivalent: slight damage of the unprotected column; the protection post is not damaged (preferably 4mm) when adopting panel thickness 4 ~ 8mm, and the slight damage degree of protection post reduces when adopting panel thickness 2 ~ 3 mm. (2)10kg explosive equivalent: severe damage of the unprotected column and the concrete of the back burst surface are corroded and damaged; the protection post is not damaged (6 mm is preferred) when adopting panel thickness 6 ~ 8mm, and the slight damage of protection post when adopting panel thickness 4 ~ 5mm, protection post moderate damage when adopting panel thickness 2 ~ 3mm, and the damage degree obviously reduces. (3)15kg explosive equivalent: severe damage of the unprotected column, severe corrosion damage of the concrete of the back burst surface and shear damage of the protected column; the protective column is slightly damaged when the panel is 6-8 mm thick, and the protective column is moderately damaged when the panel is 3-5 mm thick, so that the concrete on the explosion-facing side is peeled and damaged. (4)20kg explosive equivalent: the bearing capacity of the unprotected column is lost, the concrete of the explosion-facing surface is broken through, and the protected column is damaged in a shearing way; the protective column is slightly damaged (preferably 8mm) when the panel thickness is 8mm, and the protective column is moderately damaged when the panel thickness is 4-7 mm, and the back burst face concrete is peeled off and damaged.
TABLE 10 optimal design of construction parameters of triangular corrugated sandwich plate 4
Figure BDA0002970858080000162
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims (10)

1. A subway station pillar (1) explosion suppression structure based on corrugated sandwich plates (2) is characterized in that the explosion suppression structure comprises the corrugated sandwich plates (2) arranged on the outer surfaces of the station pillar (1), the corrugated sandwich plates (2) are arranged in four, the four corrugated sandwich plates (2) are respectively arranged on the outer surfaces of the corresponding station pillars (1), and the two adjacent corrugated sandwich plates (2) are connected into a whole through longitudinal connecting pieces (3); the upper end of the longitudinal connecting piece (3) is connected with the upper floor slab, and the lower end of the longitudinal connecting piece is connected with the lower floor slab.
2. Subway station sill column (1) explosion-reducing structure based on corrugated sandwich plates (2) according to claim 1, characterized in that the corrugated sandwich plates (2) are triangular corrugated sandwich plates (4).
3. Subway station pillar (1) explosion-mitigation structure based on corrugated sandwich plates (2) according to claim 2, characterized in that said triangular corrugated sandwich plates (4) are arranged at a distance from or in direct contact with said station pillar (1).
4. A subway station pillar (1) explosion-reducing structure based on corrugated sandwich plate (2) as claimed in claim 3, characterized in that said distance is greater than 0mm and less than or equal to 70 mm.
5. An explosion-reducing structure of a subway station pillar (1) based on corrugated sandwich plates (2) according to claim 2, characterized in that under the explosion of a close-range backpack bomb, the parameters of said triangular corrugated sandwich plate (4) are: the plate thickness ratio of the face plate to the core plate is more than or equal to 1 and less than or equal to 3; the cell width is more than or equal to 15mm and less than or equal to 60 mm; the thickness of the interlayer is not less than 15mm and not more than 45 mm.
6. A subway station platform column (1) antiknock structure based on corrugated sandwich plates (2) according to claim 3, wherein, under 5kg explosive equivalent of the next level of protection, the panel thickness of the triangular corrugated sandwich plate (4) is greater than or equal to 4mm and less than or equal to 8mm, and under 5kg explosive equivalent of the second level of protection, the panel thickness of the triangular corrugated sandwich plate (4) is greater than or equal to 2mm and less than or equal to 3 mm;
when the 10kg explosive equivalent is used for the next-stage protection, the thickness of the panel of the triangular corrugated sandwich plate (4) is more than or equal to 6mm and less than or equal to 8mm, and when the 10kg explosive equivalent is used for the second-stage protection, the thickness of the panel of the triangular corrugated sandwich plate (4) is more than or equal to 4mm and less than or equal to 5 mm;
the panel thickness of the triangular corrugated sandwich panel (4) is more than or equal to 6mm and less than or equal to 8mm under 15kg of explosive equivalent for secondary protection, and the panel thickness of the triangular corrugated sandwich panel (4) is more than or equal to 3mm and less than or equal to 5mm under 15kg of explosive equivalent for tertiary protection;
and when the secondary protection is carried out under the explosive equivalent of 20kg, the thickness of the panel of the triangular corrugated sandwich plate (4) is 8mm, and when the tertiary protection is carried out under the explosive equivalent of 20kg, the thickness of the panel of the triangular corrugated sandwich plate (4) is more than or equal to 4mm and less than or equal to 7 mm.
7. Subway station sill column (1) explosion-reducing structure based on corrugated sandwich plates (2) according to claim 1, characterized in that said corrugated sandwich plates (2) are hollow sandwich plates.
8. A subway station pillar (1) explosion-reducing structure based on corrugated sandwich plates (2) as claimed in claim 7, characterized in that said hollow sandwich plates are arranged in direct contact with said station pillar (1).
9. Subway station sill column (1) explosion-reducing structure based on corrugated sandwich plates (2) according to claim 1, characterized in that said corrugated sandwich plates (2) are circular corrugated sandwich plates.
10. Subway station pillar (1) explosion-mitigation structure based on corrugated sandwich plates (2) according to claim 1, characterized in that said longitudinal connectors (3) are not connected with said station pillar (1).
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080256938A1 (en) * 2007-01-12 2008-10-23 Miretti Angelo B Explosion protection system with integrated emission control device
CN104175623A (en) * 2014-08-19 2014-12-03 西安交通大学 Foamed aluminum-corrugated plate composite sandwich plate and preparation method thereof
CN205329909U (en) * 2015-12-30 2016-06-22 天津大学 Ripple clamp core steel plate wall cracks in both sides
CN210917942U (en) * 2019-09-30 2020-07-03 河南安筑建筑科技有限公司 Light high strength explosion-proof board
CN111456357A (en) * 2020-03-26 2020-07-28 沈阳促晋科技有限公司 High-strength light large-deformation energy-consumption explosion-proof hanging plate
CN112195836A (en) * 2020-09-30 2021-01-08 北京工业大学 Foam concrete filled pyramid type three-dimensional lattice sandwich structure pier anti-collision device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080256938A1 (en) * 2007-01-12 2008-10-23 Miretti Angelo B Explosion protection system with integrated emission control device
CN104175623A (en) * 2014-08-19 2014-12-03 西安交通大学 Foamed aluminum-corrugated plate composite sandwich plate and preparation method thereof
CN205329909U (en) * 2015-12-30 2016-06-22 天津大学 Ripple clamp core steel plate wall cracks in both sides
CN210917942U (en) * 2019-09-30 2020-07-03 河南安筑建筑科技有限公司 Light high strength explosion-proof board
CN111456357A (en) * 2020-03-26 2020-07-28 沈阳促晋科技有限公司 High-strength light large-deformation energy-consumption explosion-proof hanging plate
CN112195836A (en) * 2020-09-30 2021-01-08 北京工业大学 Foam concrete filled pyramid type three-dimensional lattice sandwich structure pier anti-collision device

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