CN113565264A - FRP-UHPFRC-concrete composite column - Google Patents
FRP-UHPFRC-concrete composite column Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/36—Columns; Pillars; Struts of materials not covered by groups E04C3/32 or E04C3/34; of a combination of two or more materials
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Abstract
The invention discloses an FRP-UHPFRC-concrete composite column, which adopts an ultra-high performance fiber concrete (UHPFRC) pipe to restrain a concrete column, and an FRP layer is adhered outside the UHPFRC pipe to form the composite concrete column. And a lining is placed in the UHPFRC pipe to prevent the UHPFRC pipe from being damaged during pouring. In the concrete column, reinforcing steel bars can be configured as required. According to different structural design requirements, the UHPFRC pipe can play a role in circumferential restraint and can also bear vertical load, the end part of the composite column adopts corresponding different restraints, and the UHPC pipe restraint concrete is further restrained by the FRP cloth, so that the bearing capacity of the concrete column can be greatly improved. Compared with the traditional steel pipe concrete, the UHPFRC pipe has better interface mechanical property with the concrete inner column and good structural integrity, and the composite column has better durability and fire resistance and can well resist disasters such as earthquake, impact, explosion and the like. In addition, the UHPFRC pipe can be prefabricated and produced by adopting a centrifugal method, the construction is convenient, the working procedure is simple, and the manufacturing cost is low.
Description
Technical Field
The invention relates to the field of building materials and structural engineering, in particular to an FRP-UHPFRC-concrete composite column.
Background
Concrete is the most widely used artificial building material due to its low cost and good mechanical properties. The amount of concrete used worldwide is over 100 million tons per year, and is expected to increase to 180 million tons by 2050, wherein china consumes more than 50% of all the concrete production worldwide. However, the concrete industry has a serious environmental impact, releasing over 16 million tons of carbon dioxide annually, accounting for 7% of the worldwide human-active carbon dioxide emissions annually. Most concrete products are made of reinforced concrete of ordinary strength, and the design life of a building is only 50 years due to material deterioration and corrosion of reinforcing steel bars. Accordingly, the construction industry is still in need of new building materials and structural systems, and is thus moving towards safer, greener, more durable and sustainable directions. This is particularly acute for the sustainable development of china, which is due to the low quality of building materials and technologies, resulting in a lifetime of only around 30 years for most buildings.
The steel tube concrete column has been widely used, especially in China, in large-span structures such as high-rise buildings, bridges and factories, and the steel tube concrete column has higher bearing capacity, ductility and durability than the traditional reinforced concrete column due to the constraint effect of the steel tube on the concrete. However, concrete filled steel tube members have some problems: (1) concrete and steel have different moduli and coefficients of thermal expansion, resulting in inconsistent deformation of the two, and often failure at the interface, which is detrimental to structural integrity. Moreover, these defects are hidden inside the pipe and are difficult to measure and monitor; (2) the high strength properties of steel are often not fully utilized; (3) steel pipes are susceptible to corrosion and erosion, particularly in harsh environments (e.g., chemical plants, offshore platforms, nuclear power plants), and are less fire resistant than concrete. Additional protection measures add cost and structural complexity.
Nowadays, FRPs have been largely applied to building structure reinforcement and repair reinforcement, ocean engineering, and the like; compared with steel, the strength of the FRP can be more than 10 times higher, but the mass of the FRP is only one fifth of that of the FRP; the FRP can not only obviously improve the bearing capacity of the constraint component, but also has excellent corrosion resistance. Therefore, the FRP-UHPFRC-concrete column has the characteristics of high bearing capacity, good corrosion resistance, good durability and the like.
Disclosure of Invention
In order to overcome the technical problems, the invention provides a brand-new composite column, an ultra-high performance steel fiber concrete (UHPFRC) pipe is adopted to replace a steel pipe and is used for restraining fresh concrete, and an FRP layer is coated outside the UHPFRC pipe. The composite column has excellent strength, ductility, durability and sustainability.
The ultra-high performance steel fiber concrete UHPFRC is a material prepared by randomly distributing high-strength steel/polymer fibers in compact high-strength mortar, and has excellent permeability resistance, erosion resistance, corrosion resistance and fire resistance. The compressive strength of UHPFRC exceeds 150 MPa. Due to the bridging effect of the fibers, the tensile strength and the bending strength can respectively reach 12MPa and 40MPa, and the fracture toughness reaches 40kJ/m2So that it has the same toughness as metal. In addition, its density, modulus and coefficient of thermal expansion are very close to those of ordinary strength concrete. This will greatly improve the deformation coordination between the UHPFRC pipe and the confined concrete. Compared with the traditional steel pipe concrete, the UHPFRC pipe column filled with the mixed concrete has higher durability and fire resistance, simultaneously fully utilizes the high strength, toughness and ductility of the UHPFRC, and can well resist disasters such as earthquake, impact, explosion and the like. The invention compounds FRP layer on the basis of UHPFRC material to form FRP-UHPFRC compound structure layer, further improves the integrity and durability of the structure, and mechanical property, especially bearing capacity.
The invention adopts the following specific technical scheme:
the FRP-UHPFRC-concrete composite column is characterized by comprising an FRP layer, an UHPFRC pipe and a concrete column; the FRP layer and the UHPFRC pipe are used as external circumferential restraint of the concrete column, the UHPFRC pipe is externally coated with the FRP layer, concrete is poured and filled in the UHPFRC pipe to form the concrete column, and the UHPFRC pipe is used as a permanent formwork and is connected with internal concrete into a whole.
Furthermore, steel bars are arranged in the concrete columns, and the axial compression ratio of the concrete columns is not more than 0.65.
Further, the UHPFRC pipe is made of concrete materials including cement, mineral admixtures, fine sand, water, quartz powder, water reducer, and steel fibers.
Further, the mineral admixture is silica fume, or a mixture of the silica fume, fly ash and blast furnace slag; the steel fiber contains profiled cross section fiber, and the profiled cross section fiber comprises one or more of end hook fiber, wave type fiber or spiral steel fiber.
Furthermore, the concrete material for preparing the UHPFRC pipe comprises the following components in parts by mass: 1300 portions of cement, 100 portions of mineral admixture, 650 portions of fine sand, 1200 portions of quartz powder, 30-60 portions of water reducing agent, 400 portions of water and 150 portions of steel fiber. The compressive strength of the UHPFRC prepared is generally over 150 MPa.
Further, the cross-sectional shape of the UHPFRC pipe is square, round or other polygons, and the thickness is 20mm-120 mm.
Further, when the UHPFRC pipe is not bearing, the end part of the UHPFRC pipe adopts a flexible connection mode, construction joints of 10-80mm are reserved between the UHPFRC pipe and the two ends of the column, and after the construction is finished, the UHPFRC pipe is filled with asphalt or high-elasticity rubber materials for sealing; when the UHPFRC pipe bears the load, a rigid connection mode is adopted, the UHPFRC pipe is connected with the nodes through high-strength friction type bolts, or UHPC mortar is integrally cast and molded at the joint of the nodes.
Further, the FRP layer comprises FRP cloth and FRP pipes, and the material of the FRP layer is selected from Carbon Fiber (CFRP), Aramid Fiber (AFRP), Basalt Fiber (BFRP) and Glass Fiber (GFRP).
Further, the FRP layer had a thickness of 0.167mm, a high strength of the first order, a standard value of tensile strength of 3400MPa, and a modulus of elasticity in tension of 2.3X 105 MPa.
Furthermore, the FRP layer and the UHPFRC pipe are compounded in a mode of externally adhering FRP or manufacturing an FRP cylinder.
Furthermore, a lining used for preventing the pipe body from being damaged in the pouring process is arranged in the UHPFRC pipe of the concrete column, and the lining adopts a thin steel pipe or a woven fiber net.
Still further, the woven fiber web is selected from steel fibers, carbon fibers, basalt fibers, polyvinyl alcohol fibers, or polyethylene fibers; the thickness of the thin steel pipe is 0.8mm-10 mm.
According to GB50010-2010 concrete structure design Specification, the normal section compressive bearing capacity of the ultra-high performance steel fiber concrete pipe confined concrete column is as follows:
wherein N is an axial pressure design value;
is the stability factor of the reinforced concrete member; f. ofc1The design value of the axial compressive strength of the common concrete is obtained; f. ofc2The designed value of the axial compressive strength of the UHPFRC is obtained; a. the1Is the area of the section of common concrete; a. the2Is the cross-sectional area of the UHPFRC tube; f'yThe design value is the compressive yield strength of the longitudinal common steel bar; a'sThe cross section area of all longitudinal common steel bars;
ultimate compressive strength f of FRP (fiber reinforced Plastic) confined concrete cylinderco:
Wherein: f. ofccTo constrain the ultimate compressive strength of the concrete column, fcoIs the ultimate compressive strength of the unrestrained concrete column, omega is the FRP constraint effect coefficient,
wherein f iscoCompressive strength of unconstrained concrete, ffIs the tensile strength, t, of the fibrous materialfIs the thickness of the fiber composite material, d is the diameter of the round concrete column, when the section is square,
the normal section bearing capacity of the ultra-high performance steel fiber concrete pipe confined concrete column is obviously improved compared with that of a common concrete column under the condition of the same section area. Tables 1 and 2 respectively list the normal section bearing capacity of the round column and the square column, and the ultrahigh-performance steel fiber concrete pipe restrains the normal concrete column when no reinforcement is arranged. Wherein the standard value of the compressive strength of the common concrete cube is 30Mpa, the standard value of the compressive strength of the UHPFRC cube is 170Mpa, and the calculation length of the column is 3 m.
According to the design Specification for concrete Structure GB50010-2010, the design value of the axial compressive strength of the common concrete is fc114.3 MPa; standard value of UHPFRC compressive strength is expressed as fck＝0.88αc1αc2fcu,kIs subjected to reduction, fck2106.7MPa, according to the design specification NFP18-710, f, of UHPFRC, issued in Francec＝αccfck/γcFor UHPFRC materials, γcTaking 1.3, alphaccWhen 0.85 is used, the designed axial compressive strength is fc269.8 MPa; for CFRP cloth, ff＝3400MPa，tf＝0.167mm。
In the table, d is the diameter of the section of the circular concrete;
a is the side length of the section of the square concrete;
t is the UHPFRC tube thickness;
a is the total cross-sectional area of the column, A ═ A1+A2Wherein for a circular column
A2＝π(dt+t2) For square column A1＝a2，A2＝4(at+t2)；
N1The normal section of the ultra-high performance steel fiber concrete pipe confined concrete column can bear a load value,
N2the normal section of the common concrete column can bear the load value,
eta is N1And N2Is N1/N2。
N is the normal section bearing capacity of the FRP-UHPFRC-concrete column.
TABLE 1 circular column with right section capable of bearing load
TABLE 2 Square column Normal section bearable load
The calculated parameters in the table show that when the column has the same cross-sectional area, the ultra-high performance steel fiber concrete pipe confined concrete column has a larger bearing capacity advantage compared with a common concrete column, and the larger the UHPFRC thickness is, the smaller the size of the common concrete part in the composite column is, the more obvious the advantage is. Compared with the UHPFRC concrete column (without FRP layer, the other same as the former), the bearable load of the FRP-UHPFRC composite concrete column can be improved by up to 43 percent. When the same load design value is adopted, the FRP-UHPFRC composite concrete column can adopt smaller sectional area size compared with the UHPFRC concrete column.
The invention discloses an FRP-UHPFRC-concrete composite column, which adopts an ultra-high performance steel fiber concrete (UHPFRC) pipe to replace a steel pipe to restrain common concrete and then is wrapped with FRP cloth to form a composite structure. Compared with the UHPFRC concrete column, the UHPFRC concrete column has better interface mechanical property and structural integrity with fresh concrete, and the composite column has better durability and fire resistance and can better resist disasters such as earthquake, impact, explosion and the like.
Drawings
FIG. 1 is a schematic diagram of a steel cage-free composite column with a circular cross section, wherein a is a horizontal section and b is a vertical section;
FIG. 2 is a schematic diagram of a reinforcing bar composite column with a square cross section, wherein a is a horizontal section and b is a vertical section;
FIG. 3 is a perspective cross-sectional view of a steel-cage-free composite column with a circular cross-section;
fig. 4 is a perspective cross-sectional view of a reinforcing bar composite column with a square cross-section.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the present invention is not limited thereto.
In the following embodiments, unless otherwise specified, the reagents and materials are well known and commercially available.
Example 1
In this example, the structure of the FRP-UHPFRC composite concrete column is shown in FIGS. 1 and 3. The concrete column is a composite column and consists of a UHPFRC pipe and fresh concrete. The UHPFRC pipe is used as the external circumferential restraint of the concrete column, fresh concrete is poured and filled in the UHPFRC pipe, the UHPFRC pipe is used as a permanent formwork and is connected with the internal concrete into a whole, and then an FRP layer is coated outside to form the composite column.
In this example, the specific raw materials used are as follows:
the FRP layer uses FRP cloth, the ultimate tensile strength of the FRP cloth is 3400MPa, the tensile breaking strain is 0.017, and the thickness of the FRP cloth is 0.167mm respectively;
the fresh concrete is obtained by mixing and stirring portland cement, coarse aggregate, fine aggregate and water, wherein: the cement is silicate cement; the coarse aggregate is pebbles with the particle size of 5mm-15 mm; the fine aggregate is river sand which is medium sand with good gradation; the water is industrial water.
The mixing ratio (mass ratio) of the fresh concrete is shown in the following table 3.
TABLE 3 common concrete mix proportions
The ultra-high performance steel fiber reinforced concrete pipe (UHPFRC pipe) of this example is a round pipe, the diameter of the cross section is 300mm, the height is 1200mm, and the wall thickness of the UHPFRC pipe is 30 mm. In the UHPFRC pipe of the embodiment, the UHPFRC concrete raw material components comprise cement, silica fume, fine sand, water,Quartz powder, high-efficiency water reducing agent and steel fiber. In the adoption of the UHPFRC pipe, the adopted steel fiber is linear steel fiber, the diameter is 0.2mm, the length is 12mm, the length-diameter ratio is 60, and the tensile strength is 2700 MPa. The adopted cement is ordinary portland cement. The specific surface area of the silica fume is 22m2Per g, wherein SiO2The content is more than or equal to 90 percent, the grain size range of the fine sand is 0.1mm-0.5mm, the grain size of the quartz powder is 5 mu m-50 mu m, and SiO is2The content is more than or equal to 95 percent. The high-efficiency water reducing agent is a polycarboxylic acid high-efficiency powder water reducing agent, and the water reducing efficiency is more than or equal to 30 percent. The water is industrial water.
The mass ratios of the components in UHPFRC are shown in Table 4 below.
TABLE 4 UHPFRC mix ratio
The concrete manufacturing process of the ultra-high performance steel fiber concrete pipe confined concrete column comprises the following steps: and mixing the UHPFRC according to the components in the table 4 in advance, pouring the UHPFRC pipe, and curing for 28 days under standard conditions. The UHPFRC pipe was then used as a casting side form and the bottom side was sealed with a wooden form. And a hoop thin steel sheet with the thickness of 0.8mm is placed in the UHPFRC, and the hoop thin steel sheet is tightly attached to the inner side surface of the UHPFRC pipe in a thin steel pipe mode with the outer diameter slightly smaller than the inner diameter of the UHPFRC pipe to be used as a lining so as to prevent the UHPFRC pipe from being damaged during pouring. And pouring the freshly mixed common concrete into the UHPFRC pipe, and fully vibrating by using a vibrating rod after the concrete is injected. And (5) curing for 28d under standard conditions, and then coating FRP cloth.
As shown in the calculations of tables 1 and 2, the FRP-UHPFRC composite concrete column of the present embodiment has a greater load bearing advantage and better durability and fire resistance than the UHPFRC concrete column when having the same cross-sectional area.
Example 2
The difference between this example and example 1 is that the UHPFRC pipe is replaced with a square pipe, and a reinforcement cage is placed in the UHPFRC pipe, but the other procedures are the same.
The concrete column structure is shown in figures 2 and 4. Specifically, the cross-sectional dimensions of the square-section UHPFRC tube of this example were 300mm by 300mm, the height 1200mm, and the wall thickness of the UHPFRC tube 30 mm. HRB 335-grade steel bars are selected as longitudinal steel bars in the column, the diameter of the steel bars is 14mm, the total number of the steel bars is 12, the HRB 335-grade steel bars are adopted as stirrups, the diameter of the stirrups is 10mm, and the distance between the stirrups is 100 mm. The mixing ratios of the UHPFRC pipe and the general concrete in this example are shown in tables 3 and 4, respectively, and the raw materials were kept the same as in example 1.
The concrete manufacturing process of the ultra-high performance steel fiber concrete pipe confined concrete column comprises the following steps: and pouring a UHPFRC pipe according to the components in the table 4 in advance, and curing for 28 days under standard conditions. The UHPFRC pipe was then used as a casting side form and the bottom side was sealed with a wooden form. 4 thin steel sheets with the thickness of 220mm multiplied by 580mm multiplied by 0.8mm are placed in the UHPFRC, and the thin steel sheets are tightly attached to the inner side face of the UHPFRC pipe to be used as a lining to prevent the UHPFRC pipe from being damaged during pouring. And then, placing the bound reinforcement cage in a UHPFRC pipe body. And pouring newly mixed common concrete into the UHPFRC, and fully vibrating by using a vibrating rod after the concrete column is poured. And (5) curing for 28d under standard conditions, and then coating FRP cloth.
Compared with embodiment 1, the embodiment has the advantage that the strength of concrete is further enhanced due to the fact that the reinforcement cage is placed inside.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any modification, equivalent replacement, and improvement made by those skilled in the art within the technical scope of the present invention should be included in the scope of the present invention.
Claims (10)
1. The FRP-UHPFRC-concrete composite column is characterized by comprising an FRP layer, an UHPFRC pipe and a concrete column; the FRP layer and the UHPFRC pipe are used as external circumferential restraint of the concrete column, the UHPFRC pipe is externally coated with the FRP layer, concrete is poured and filled in the UHPFRC pipe to form the concrete column, and the UHPFRC pipe is used as a permanent formwork and is connected with internal concrete into a whole.
2. The FRP-UHPFRC-concrete composite column as recited in claim 1, wherein said concrete column is embedded with steel bars, and the axial compression ratio of the concrete column is not more than 0.65.
3. The FRP-UHPFRC-concrete composite post according to claim 1 wherein said UHPFRC tube is made of concrete materials including cement, mineral admixtures, fine sand, water, quartz powder, water reducer and steel fibers.
4. The FRP-UHPFRC-concrete composite column according to claim 3, wherein the mineral admixture is silica fume, or a mixture of silica fume with fly ash, blast furnace slag; the steel fiber contains profiled cross section fiber, and the profiled cross section fiber comprises one or more of end hook fiber, wave type fiber or spiral steel fiber.
5. The FRP-UHPFRC-concrete composite column as recited in claim 3, wherein the concrete material for preparing the UHPFRC pipe comprises the following components by mass: 1300 portions of cement, 100 portions of mineral admixture, 650 portions of fine sand, 1200 portions of quartz powder, 30-60 portions of water reducing agent, 400 portions of water and 150 portions of steel fiber.
6. The FRP-UHPFRC-concrete composite column according to claim 1, wherein the cross-sectional shape of the UHPFRC tube is square, circular or other polygonal shape with a thickness of 20mm-120 mm.
7. The FRP-UHPFRC-concrete composite column as recited in claim 1, wherein when the UHPFRC pipe is not bearing load, the end of the UHPFRC pipe adopts a flexible connection mode, the nodes of the UHPFRC pipe and the two ends of the column reserve 10-80mm construction joints, and after the construction is finished, the construction is sealed by pouring asphalt or high-elasticity rubber materials; when the UHPFRC pipe bears the load, a rigid connection mode is adopted, the UHPFRC pipe is connected with the nodes through high-strength friction type bolts, or UHPC mortar is integrally cast and molded at the joint of the nodes.
8. The FRP-UHPFRC-concrete composite post according to claim 1, wherein the FRP layer comprises FRP cloth and FRP pipe, the material of the FRP layer is selected from Carbon Fiber (CFRP), Aramid Fiber (AFRP), Basalt Fiber (BFRP) and Glass Fiber (GFRP).
9. The FRP-UHPFRC-concrete composite column according to any one of claims 1 to 8, wherein the UHPFRC pipe of the concrete column is internally provided with a liner for preventing the pipe body from being damaged during casting, and the liner is a thin steel pipe or a woven fiber mesh.
10. The FRP-UHPFRC-concrete composite column of claim 9, wherein the woven fiber mesh is selected from steel fibers, carbon fibers, basalt fibers, polyvinyl alcohol fibers or polyethylene fibers; the thickness of the thin steel pipe is 0.8mm-10 mm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115075474A (en) * | 2022-06-29 | 2022-09-20 | 扬州大学 | Aggregate column and manufacturing method thereof |
| CN116283088A (en) * | 2023-03-01 | 2023-06-23 | 青岛理工大学 | High-strength corrosion-resistant submarine pipeline concrete coating layer and preparation method thereof |
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| CN116283088A (en) * | 2023-03-01 | 2023-06-23 | 青岛理工大学 | High-strength corrosion-resistant submarine pipeline concrete coating layer and preparation method thereof |
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Application publication date: 20211029 |