CN113430919B - Prefabricated assembled pier structure based on lightweight ultrahigh-performance concrete reinforced plastic hinge and preparation method thereof - Google Patents
Prefabricated assembled pier structure based on lightweight ultrahigh-performance concrete reinforced plastic hinge and preparation method thereof Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/14—Producing shaped prefabricated articles from the material by simple casting, the material being neither forcibly fed nor positively compacted
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/08—Apparatus or processes for treating or working the shaped or preshaped articles for reshaping the surface, e.g. smoothing, roughening, corrugating, making screw-threads
- B28B11/0818—Apparatus or processes for treating or working the shaped or preshaped articles for reshaping the surface, e.g. smoothing, roughening, corrugating, making screw-threads for roughening, profiling, corrugating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/22—Apparatus or processes for treating or working the shaped or preshaped articles for cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/02—Methods or machines specially adapted for the production of tubular articles by casting into moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/56—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts
- B28B21/60—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts prestressed reinforcements
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
The invention belongs to the technical field of bridge engineering in civil construction and transportation industries. The preparation method of the prefabricated assembled pier structure based on the lightweight ultrahigh-performance concrete reinforced plastic hinge is characterized by comprising the following steps of: 1) Pouring a common concrete section: the prefabricated pier column consists of a prefabricated pier column common concrete section and a prefabricated pier column LUHPC section; respectively pouring the common concrete section of the prefabricated pier stud and the prefabricated bearing platform by using common concrete; 2) Pouring the LUHPC section of the prefabricated pier stud: pouring a LUHPC section of the prefabricated pier column by adopting light ultra-high performance concrete (LUHPC) to obtain the prefabricated pier column; 3) Prefabricating and assembling: and hoisting the prefabricated pier stud to the position above the prefabricated bearing platform to complete the prefabricated assembling connection. The method fully utilizes the advantages of the LUHPC, can obviously improve the ductility and energy consumption capacity of the pier after the plastic hinge area of the pier is enhanced by the LUHPC with the replacement height of b-2 b, and has convenient construction, high construction quality and excellent anti-seismic performance.
Description
Technical Field
The invention belongs to the technical field of bridge engineering in civil construction and transportation industries, and particularly relates to a prefabricated assembled pier structure based on lightweight ultrahigh-performance concrete reinforced plastic hinges and a preparation method thereof, aiming at improving the seismic performance of the prefabricated assembled pier.
Background
The prefabricated assembled pier has the advantages of convenience in construction, high construction quality, short construction period, environmental friendliness and the like, and is gradually popularized and applied in actual engineering. The reliability of the mechanical property of the connecting node of the prefabricated assembly pier body and the bearing platform (prefabricated bearing platform) directly influences the safe usability of the prefabricated assembly pier, so that higher requirements are provided for the seismic performance of the prefabricated assembly pier. When an earthquake occurs, a plastic hinge area where a prefabricated assembled pier body is connected with a bottom bearing platform (prefabricated bearing platform) is a weak position of the pier, and the plastic hinge area at the bottom of the pier usually generates large-area crushing and peeling of concrete after the earthquake, so that the pier structure fails and even collapses. The improvement of the anti-seismic performance of the pier by replacing the plastic hinge area material becomes a research hotspot. At present, the replacement material is mainly UHPC, but the UHPC has great weight, large later-period shrinkage, needs steam curing and has complex construction process.
The Lightweight Ultra-High Performance Concrete (LUHPC) has the advantages of small volume weight, high strength, strong durability, small shrinkage, no steam curing and the like. The LUHPC is applied to the plastic hinge area of the prefabricated spliced pier, so that the damage degree of concrete in the plastic hinge area of the pier can be obviously reduced, the ductility, the energy consumption capacity and the plastic rotation capacity of the pier are improved, and the anti-seismic performance of the prefabricated spliced pier can be obviously improved. Meanwhile, the LUHPC can realize the lightening of prefabricated assembled pier components, solves the problems of heavy weight, large shrinkage, steam curing, large hoisting difficulty and the like of the UHPC pier, and has wide application prospect.
Disclosure of Invention
The invention aims to provide a prefabricated spliced pier structure based on a lightweight ultrahigh-performance concrete reinforced plastic hinge and a preparation method thereof, which can improve the seismic performance of piers.
In order to achieve the purpose, the prefabricated assembled pier structure based on the lightweight ultrahigh-performance concrete reinforced plastic hinge comprises a prefabricated pier column (or called as a prefabricated assembled pier body) and a prefabricated bearing platform 2, wherein the prefabricated pier column is connected with the prefabricated bearing platform 2; the method is characterized in that: prefabricated pier stud comprises prefabricated pier stud ordinary concrete section 1 and prefabricated pier stud LUHPC section 3, and the upper end of prefabricated pier stud LUHPC section 3 links to each other (pours the connection) with the lower extreme of prefabricated pier stud ordinary concrete section 1, and the lower extreme of prefabricated pier stud LUHPC section 3 links to each other with prefabricated cushion cap 2.
The lower extreme of prefabricated pier stud LUHPC section 3 links to each other with prefabricated cushion cap 2 and is: and slowly inserting the longitudinal steel bars extending out of the prefabricated pier stud into the reserved grouting holes 5 in the corresponding positions of the prefabricated bearing platforms, and pouring the fully-stirred high-strength grouting material into the reserved grouting holes 5 to complete the prefabricated assembly connection.
The height H of the prefabricated pier stud LUHPC section 3 is b-2b, and the section width of the prefabricated pier stud is b.
The preparation method of the prefabricated assembled pier structure based on the lightweight ultrahigh-performance concrete reinforced plastic hinge is characterized by comprising the following steps of:
1) Pouring a common concrete section: the prefabricated pier column consists of a prefabricated pier column common concrete section 1 and a prefabricated pier column LUHPC section 3; firstly, binding and erecting templates of prefabricated pier columns and reinforcement cages of prefabricated bearing platforms 2 are respectively carried out, baffles are respectively arranged at the upper end and the lower end of a LUHPC section 3 of the prefabricated pier column, holes for longitudinal reinforcements to pass through are formed in the baffles, the longitudinal reinforcements of the reinforcement cages of the prefabricated pier columns pass through the holes in the baffles, and foam rubber is used for blocking the holes through which the longitudinal reinforcements pass; PVC pipes are inserted into the prefabricated bearing platform 2 (the PVC pipes form reserved holes in the prefabricated bearing platform through the PVC pipes, and the number of the PVC pipes corresponds to the number of longitudinal steel bars of a steel bar cage of the prefabricated pier stud);
respectively pouring the common concrete section 1 of the prefabricated pier stud and the prefabricated bearing platform 2 by using common concrete; after the concrete of the prefabricated bearing platform 2 is initially set, pulling out the PVC pipes (10-20 PVC pipes), and forming reserved grouting holes 5 on the prefabricated bearing platform 2;
2) Pouring the LUHPC section of the prefabricated pier stud: after the ordinary concrete is cured for 3 days, removing a baffle at the upper end of the prefabricated pier stud LUHPC section 3, performing roughening treatment on a connecting interface of the prefabricated pier stud ordinary concrete section 1 (namely the lower end surface of the prefabricated pier stud ordinary concrete section 1), cleaning gravels on the concrete roughening interface and foam adhesive on longitudinal steel bars through a high-pressure water gun, and performing pre-wetting treatment on the connecting interface of the ordinary concrete and the prefabricated pier stud LUHPC section before pouring the prefabricated pier stud LUHPC section; pouring a LUHPC section of the prefabricated pier column by adopting light ultra-high performance concrete (LUHPC) to obtain a prefabricated pier column (or called as prefabricated assembled pier);
3) Prefabricating and assembling: for the prefabricated pier stud, after the light ultra-high performance concrete (LUHPC) is maintained for 28 days, removing a baffle at the lower end of the LUHPC section 3 of the prefabricated pier stud, hoisting the prefabricated pier stud to the position above the prefabricated bearing platform, slowly inserting a longitudinal steel bar extending out of the prefabricated pier stud into a reserved grouting hole 5 at the corresponding position of the bearing platform, pouring fully-stirred high-strength grouting material into the reserved grouting hole 5, and completing the prefabricated assembly connection.
In the step 1), the grade of the longitudinal steel bars of the steel bar cages of the prefabricated pier stud and the prefabricated bearing platform 2 is HRB400, the diameter d of the longitudinal steel bars is 12mm, the width of the baffle is the width of the section of the prefabricated pier stud, and the thickness of the baffle is not less than 1.5cm.
The scabbling depth of the common concrete interface in the step 2) is not less than 10mm, the height H of the LUHPC section 3 of the prefabricated pier column is b-2 b (the LUHPC replacement height is b-2 b), and b is the section width of the prefabricated pier column.
In the step 3), the diameter D of the reserved grouting hole 5 is 3D (D is the diameter of the longitudinal steel bar), the anchoring length h1 of the longitudinal steel bar is 15D, and the depth h2 of the reserved grouting hole 5 is not less than 16D.
The Lightweight Ultra High Performance Concrete (LUHPC) of the prefabricated pier stud LUHPC section 3 has a compressive strength of not less than 110MPa, a tensile strength at split of not less than 12MPa, and an elastic modulus of not less than 3.8 x 10 4 MPa, apparent density lower than 2100kg/m 3 。
The common concrete is C30-C80 concrete.
The fixed cap pipeline 4 is formed by a PVC pipe for passing through an anchoring reinforcing bar, thereby preventing sliding and tilting of a pier.
According to the invention, the plastic hinge area material of the prefabricated pier stud is replaced by LUHPC, and the replacement height is b-2 b, so that a prefabricated spliced pier structure is formed, and the aim of effectively improving the anti-seismic performance of the prefabricated spliced pier is achieved.
The basic principle of the prefabricated assembled pier structure and the preparation method thereof is as follows:
the method comprises the steps of firstly pouring common concrete sections (namely the prefabricated pier column common concrete sections) of prefabricated pier columns (or called prefabricated spliced piers), then pouring LUHPC sections (namely the prefabricated pier column LUHPC sections 3) of prefabricated spliced pier plastic hinge areas, connecting the prefabricated pier columns and prefabricated bearing platforms together to form a prefabricated spliced pier structure after LUHPC maintenance is carried out for 28 days, wherein the prefabricated spliced common concrete piers are easy to damage in the plastic hinge areas and weak in anti-seismic performance, and the LUHPC made of ultra-high performance concrete materials is applied to the plastic hinge areas, so that the material performance of the plastic hinge areas is enhanced, the aim of improving the anti-seismic performance of the prefabricated spliced piers is achieved, and the LUHPC replacement height is determined to be b-2 b through tests.
The invention has the following beneficial effects and advantages:
the steel fiber in the lightweight ultra-high performance concrete (LUHPC) can effectively limit the development of cracks, so that the damage of the pier is delayed, the ductility of the pier is improved, and meanwhile, a large amount of energy is dissipated by the steel fiber in the LUHPC section of the prefabricated pier column in the horizontal pushing-pulling process, so that the energy consumption capability of the pier is greatly improved. The high compressive strength of the LUHPC can ensure that when one side of the prefabricated assembled pier is tilted and is separated from the prefabricated bearing platform, the concrete on the other side is not crushed; the high tensile strength of LUHPC can obviously reduce the peeling range of pier column concrete, so that the larger area of concrete and reinforcing steel bars are stressed together, and the horizontal ultimate bearing capacity and rigidity of the pier column concrete are improved. The high ductility of LUHPC enhances the plastic rotation capability of the pier, and may provide greater deformability to the structure. The LUHPC can realize the lightening of pier components and is more favorable for on-site hoisting construction. The prefabricated assembled pier structure and the preparation method thereof can not only obviously improve the ductility, the energy consumption capability and the plastic rotation capability of the pier and delay the degradation of equivalent rigidity, but also have the advantages of simple operation, high construction quality, short construction period, environmental protection and wide application prospect, and specifically comprise the following steps:
(1) The steel fiber in the LUHPC section can effectively limit the development of cracks, so that the occurrence of bridge pier damage is delayed, a good effect of improving the ductility of the bridge pier is achieved, meanwhile, a large amount of energy is dissipated in the horizontal pushing-pulling process of the steel fiber in the LUHPC section, and the energy consumption capacity of the bridge pier is greatly improved.
(2) The high compressive strength of the LUHPC can ensure that when one side of the bridge pier is tilted and is separated from the prefabricated bearing platform, the concrete on the other side is not crushed; the high tensile strength of LUHPC can obviously reduce the peeling range of pier column concrete, so that the larger area of concrete and reinforcing steel bars are stressed together, and the horizontal ultimate bearing capacity and rigidity of the pier column concrete are improved.
(3) The high ductility of LUHPC enhances the plastic rotation capability of the pier, and may provide greater deformability to the structure.
(4) The LUHPC can realize the lightening of pier components and is more favorable for on-site hoisting construction.
(5) The method fully utilizes the advantages of small LUHPC volume weight, high strength, strong durability, small shrinkage, no steam curing and the like, and can obviously improve the ductility and energy consumption capability of the pier after the plastic hinge area of the pier is enhanced by adopting the LUHPC with the replacement height of b-2 b, and the method has the advantages of convenient construction, high construction quality and excellent anti-seismic performance.
Drawings
Fig. 1 is a schematic view showing a structure of a prefabricated pier assembly according to the present invention (plastic hinges are reinforced by LUHPC).
Fig. 2 is a schematic diagram of the size and the reinforcement of a test piece of the prefabricated assembled pier structure (plastic hinges are reinforced by LUHPC). The prefabricated pier comprises (a) a prefabricated pier column section reinforcing bar diagram, (b) a prefabricated pile cap side view, (c) a prefabricated pier column front view, (d) a prefabricated pile cap top view and (e) a prefabricated pile cap front view.
Fig. 3 is a schematic view of a test piece damage of the LUHPC-substituted-0 prefabricated spliced pier structure (or called prefabricated spliced pier) according to the present invention.
Fig. 4 is a schematic view showing the destruction of a test piece of the fabricated pier structure of the LUHPC replacement b according to the present invention.
FIG. 5 is a schematic diagram showing the destruction of a test piece of the fabricated pier structure with the LUHPC replacing the structure 2b
In the figure: 1. prefabricating a common concrete section of the pier stud; 2. prefabricating a bearing platform; 3. prefabricating a pier stud LUHPC section; 4. fixing a cushion cap pipeline; 5. reserving a grouting hole; h is the height of prefabricated pier stud, H is the height of prefabricated pier stud LUHPC section 3, b is prefabricated pier stud cross-sectional width.
Detailed Description
The invention is further described below with reference to specific examples and the accompanying drawings, but the invention is not limited thereto.
As shown in fig. 1, the prefabricated assembled pier structure based on the lightweight ultrahigh-performance concrete reinforced plastic hinge comprises prefabricated pier columns (or prefabricated assembled pier bodies) and prefabricated bearing platforms 2, wherein the prefabricated pier columns are connected with the prefabricated bearing platforms 2; the prefabricated pier column is composed of a prefabricated pier column common concrete section 1 and a prefabricated pier column LUHPC section 3, the upper end of the prefabricated pier column LUHPC section 3 is connected (poured and connected) with the lower end of the prefabricated pier column common concrete section 1, and the lower end of the prefabricated pier column LUHPC section 3 is connected with a prefabricated bearing platform 2 (a reserved grouting hole connection mode is that longitudinal steel bars extending out of the prefabricated pier column are slowly inserted into reserved grouting holes 5 in corresponding positions of the bearing platform, and high-strength grouting material which is fully stirred is poured into the reserved grouting holes 5 to complete prefabricated assembly connection, so that the prefabricated pier column LUHPC section 3 and the prefabricated bearing platform 2 are connected together).
The steel reinforcement cage of prefabricated pier stud LUHPC section 3 links into an organic whole with the steel reinforcement cage of prefabricated pier stud ordinary concrete section 1.
The height H of the prefabricated pier stud LUHPC section 3 is b-2b, and the section width of the prefabricated pier stud is b.
The preparation method of the prefabricated assembled pier structure based on the lightweight ultrahigh-performance concrete reinforced plastic hinge comprises the following steps:
1) Pouring a common concrete section: as shown in fig. 1, the prefabricated pier stud is composed of a prefabricated pier stud ordinary concrete section 1 and a prefabricated pier stud LUHPC section 3; firstly, binding and erecting templates of prefabricated pier columns and reinforcement cages of prefabricated bearing platforms 2 are respectively carried out, baffles (for convenience of description, the upper part and the lower part in the figure 1 are the upper part and the lower part) are respectively arranged at the upper end and the lower end of a LUHPC section 3 of the prefabricated pier column, holes for longitudinal reinforcements to pass through are formed in the baffles, the longitudinal reinforcements of the reinforcement cages of the prefabricated pier columns pass through the holes in the baffles, and foam rubber is used for blocking the holes for the longitudinal reinforcements to pass through; inserting PVC pipes into the prefabricated bearing platform 2 (the PVC pipes form reserved holes in the prefabricated bearing platform through the PVC pipes);
respectively pouring the common concrete section 1 of the prefabricated pier stud and the prefabricated bearing platform 2 by using common concrete; after the concrete of the prefabricated bearing platform 2 is initially set, pulling out the PVC pipes (10-20 PVC pipes), and forming reserved grouting holes 5 on the prefabricated bearing platform 2;
2) Pouring a prefabricated pier stud LUHPC section: after the common concrete is cured for 3 days, removing a baffle at the upper end of the LUHPC section 3 of the prefabricated pier column, performing chiseling treatment on a connecting interface (namely the lower end face) of the common concrete section 1 of the prefabricated pier column, cleaning broken stones on the chiseling interface of the concrete and foam rubber on longitudinal steel bars by using a high-pressure water gun, and performing pre-wetting treatment on the connecting interface of the common concrete and the LUHPC section of the prefabricated pier column before pouring the LUHPC section of the prefabricated pier column; as shown in fig. 1, pouring a LUHPC section of a prefabricated pier column by using Lightweight Ultra High Performance Concrete (LUHPC) to obtain a prefabricated pier column (or called as prefabricated spliced pier);
3) Prefabricating and assembling: for the prefabricated pier stud, after the light ultra-high performance concrete (LUHPC) is maintained for 28 days, removing a baffle at the lower end of the LUHPC section 3 of the prefabricated pier stud, hoisting the prefabricated pier stud to the position above the prefabricated bearing platform, slowly inserting a longitudinal steel bar extending out of the prefabricated pier stud into a reserved grouting hole 5 at the corresponding position of the bearing platform, pouring fully-stirred high-strength grouting material into the reserved grouting hole 5, and completing the prefabricated assembly connection.
In the step 1), the grade of the longitudinal steel bars of the steel bar cages of the prefabricated pier stud and the prefabricated bearing platform 2 is HRB400, the diameter d of the longitudinal steel bars is 12mm, the width of the baffle is the width of the section of the prefabricated pier stud, and the thickness of the baffle is not less than 1.5cm.
The scabbling depth of the common concrete interface in the step 2) is not less than 10mm, the height H of the LUHPC section 3 of the prefabricated pier column is b-2 b (the LUHPC replacement height is b-2 b), and b is the section width of the prefabricated pier column.
In the step 3), the diameter D of the reserved grouting hole 5 is 3D (D is the diameter of the longitudinal steel bar), the anchoring length h1 of the longitudinal steel bar is 15D, and the depth h2 of the reserved grouting hole 5 is not less than 16D.
The Lightweight Ultra High Performance Concrete (LUHPC) of the prefabricated pier stud LUHPC section 3 has a compressive strength of not less than 110MPa, a tensile strength at split of not less than 12MPa, and an elastic modulus of not less than 3.8 x 10 4 MPa, apparent density lower than 2100kg/m 3 。
The common concrete is C30-C80 concrete.
The fixed cap pipeline 4 is formed by a PVC pipe for passing through an anchoring reinforcing bar, thereby preventing sliding and tilting of a pier.
The specific application embodiment is as follows:
and developing a pseudo-static test of the prefabricated assembled pier structure based on the lightweight ultrahigh-performance concrete reinforced plastic hinge, and comparing and analyzing various anti-seismic performance indexes of pier test pieces with LUHPC replacement heights of 0, b and 2b. The method comprises the following specific steps:
(1) Pouring a common concrete section: firstly, binding and erecting a template of a prefabricated pier column and a bearing platform reinforcement cage, arranging baffles at the upper end and the lower end of a LUHPC section of the prefabricated pier column, plugging a hole through which a longitudinal reinforcement passes by using foam rubber, forming a reserved hole in the prefabricated bearing platform through a PVC pipe, and slowly pulling out the PVC pipe after the concrete is initially set. As shown in attached figure 1, a common concrete section 1 and a prefabricated bearing platform of the pier column are respectively poured, the common concrete grade is C50, the size of the section of the pier column is 300mm multiplied by 300mm, the size of the bearing platform is 1500mm multiplied by 430mm multiplied by 370mm, HRB 400-grade steel bars are adopted for longitudinal steel bars and stirrups, the diameter of the longitudinal steel bars is 12mm, and the diameter of the stirrups is 8mm. The performance parameters of the common concrete are shown in a table 1, and the mechanical properties of the steel bars are shown in a table 2.
TABLE 1 compressive strength of plain concrete cube
TABLE 2 mechanical Property parameters of the reinforcing bars
(2) Pouring a LUHPC section: and after the ordinary concrete is maintained for 3 days, chiseling the connecting interface, cleaning broken stones and foam rubber on longitudinal steel bars of the chiseling interface of the concrete by using a high-pressure water gun, and pre-wetting the connecting interface of the ordinary concrete and the LUHPC before pouring the LUHPC. As shown in fig. 1, the LUHPC section of the prefabricated pier was cast using Lightweight Ultra High Performance Concrete (LUHPC) to obtain a prefabricated pier, and the LUHPC performance parameters are shown in table 3 and table 4.
TABLE 3 LUHPC cubic compressive strength
TABLE 4LUHPC test pieces tensile strength at split
(3) Prefabricating and assembling: for the prefabricated assembled pier, after LUHPC maintenance is carried out for 28 days, the prefabricated pier stud is hoisted to the position above the prefabricated bearing platform, the longitudinal steel bar extending out of the prefabricated pier stud is slowly inserted into the reserved grouting hole 5 in the corresponding position of the bearing platform, the fully-stirred high-strength grouting material is poured into the reserved grouting hole 5, the prefabricated assembly connection is completed, and the performance parameters of the high-strength grouting material are shown in a table 5.
TABLE 5 high-strength compression strength of grouting material test block
(4) And after the prefabrication and assembly are completed and the maintenance is carried out for 28 days, performing a pseudo-static test on the pier test piece, and evaluating the anti-seismic performance of the test piece through parameters such as a hysteresis curve, a skeleton curve, ductility, rigidity characteristics, accumulated energy consumption, plastic rotation and the like.
Table 6 shows the ultimate bearing capacity F of the prefabricated assembled pier when the LUHPC replacement height is b and 2b respectively max Ductility mu, ultimate deflection rate D, accumulated energy consumption E, equivalent stiffness K with deflection rate of 3.25 percent, and maximum average curvature value phi max And the seismic performance indexes are improved compared with the common concrete bridge pier. Wherein the offset rate is the ratio of the horizontal loading displacement to the distance from the horizontal load to the bottom of the pier.
TABLE 6 actually measured earthquake resistance evaluation index improvement coefficient
For a prefabricated assembled pier structure (or called prefabricated assembled pier) with the LUHPC replacement height of b-2 b, the ultimate bearing capacity is improved by 4-6%, the ductility is improved by 17-24%, the ultimate deviation rate is improved by 14-29%, the accumulated energy consumption is improved by 32-63%, the equivalent stiffness is improved by 10-25%, and the average curvature is improved by 27-127%. The prefabricated spliced pier structure provided by the invention obviously improves various earthquake-resistant performance indexes of the pier and achieves the purpose of improving the earthquake-resistant performance of the prefabricated spliced pier.
Claims (5)
1. The preparation method of the prefabricated assembled pier structure based on the lightweight ultrahigh-performance concrete reinforced plastic hinge is characterized in that the prefabricated assembled pier structure based on the lightweight ultrahigh-performance concrete reinforced plastic hinge comprises a prefabricated pier column and a prefabricated bearing platform (2), wherein the prefabricated pier column is connected with the prefabricated bearing platform (2); the prefabricated pier column consists of a prefabricated pier column common concrete section (1) and a prefabricated pier column LUHPC section (3), the upper end of the prefabricated pier column LUHPC section (3) is connected with the lower end of the prefabricated pier column common concrete section (1), and the lower end of the prefabricated pier column LUHPC section (3) is connected with the prefabricated bearing platform (2);
the preparation method of the prefabricated assembled pier structure based on the lightweight ultrahigh-performance concrete reinforced plastic hinge comprises the following steps:
1) Pouring a common concrete section: the prefabricated pier column consists of a prefabricated pier column common concrete section (1) and a prefabricated pier column LUHPC section (3); firstly, binding and erecting templates of reinforcement cages of a prefabricated pier column and a prefabricated bearing platform (2) respectively, arranging baffles at the upper end and the lower end of a LUHPC section (3) of the prefabricated pier column respectively, wherein holes for longitudinal reinforcements to pass through are formed in the baffles, the longitudinal reinforcements of the reinforcement cage of the prefabricated pier column pass through the holes in the baffles, and foam rubber is used for blocking the holes through which the longitudinal reinforcements pass; PVC pipes are inserted into the prefabricated bearing platform (2);
respectively pouring the prefabricated pier column common concrete section (1) and the prefabricated bearing platform (2) by using common concrete; after the concrete of the prefabricated bearing platform (2) is initially set, pulling out the PVC pipe, and forming a reserved grouting hole (5) on the prefabricated bearing platform (2);
2) Pouring the LUHPC section of the prefabricated pier stud: after the common concrete is cured for 3 days, removing a baffle plate at the upper end of the LUHPC section (3) of the prefabricated pier column, chiseling the connecting interface of the common concrete section (1) of the prefabricated pier column, cleaning broken stones at the chiseling interface of the concrete and foam rubber on longitudinal steel bars by a high-pressure water gun, and pre-wetting the connecting interface of the common concrete and the LUHPC section of the prefabricated pier column before pouring the LUHPC section of the prefabricated pier column; pouring the LUHPC section of the prefabricated pier column by adopting light ultra-high performance concrete to obtain the prefabricated pier column;
3) Prefabricating and assembling: for the prefabricated pier stud, after the light ultra-high performance concrete is maintained for 28 days, removing a baffle at the lower end of the LUHPC section (3) of the prefabricated pier stud, hoisting the prefabricated pier stud to the position above the prefabricated bearing platform, inserting a longitudinal steel bar extending out of the prefabricated pier stud into a reserved grouting hole (5) in the corresponding position of the bearing platform, pouring the stirred high-strength grouting material into the reserved grouting hole (5), and completing the prefabricated assembly connection.
2. The preparation method of the prefabricated assembled pier structure based on the lightweight ultrahigh-performance concrete reinforced plastic hinge, according to claim 1, is characterized in that: in the step 1), the grade of the longitudinal steel bars of the steel bar cages of the prefabricated pier stud and the prefabricated bearing platform (2) is HRB400, the diameter d of the longitudinal steel bars is 12mm, the width of the baffle is the width of the section of the prefabricated pier stud, and the thickness of the baffle is not less than 1.5cm.
3. The preparation method of the prefabricated assembled pier structure based on the lightweight ultrahigh-performance concrete reinforced plastic hinge, according to claim 1, is characterized in that: the scabbling depth of the common concrete interface in the step 2) is not less than 10mm, the height H of the LUHPC section (3) of the prefabricated pier column is b-2b, and b is the section width of the prefabricated pier column.
4. The preparation method of the prefabricated assembled pier structure based on the lightweight ultrahigh-performance concrete reinforced plastic hinge, according to claim 1, is characterized in that: in the step 3), the diameter D of the reserved grouting hole (5) is 3d, D is the diameter of the longitudinal steel bar, the anchoring length h1 of the longitudinal steel bar is 15D, and the depth h2 of the reserved grouting hole (5) is not less than 16D.
5. The preparation method of the prefabricated assembled pier structure based on the lightweight ultrahigh-performance concrete reinforced plastic hinge, according to claim 1, is characterized in that: the compressive strength of the lightweight ultra-high performance concrete of the prefabricated pier stud LUHPC section (3) is not lower than 110MPa, and the splitting tensile strength is highDegree of 12MPa or more and elastic modulus of 3.8X 10 or more 4 MPa, apparent density lower than 2100kg/m 3 。
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| CN107988895B (en) * | 2017-11-29 | 2019-12-06 | 浙江跃龙园林建设有限公司 | Bridge and construction method thereof |
| CN108442237B (en) * | 2018-04-27 | 2023-06-02 | 福建工程学院 | Structure for rapid splicing of prefabricated bridge pier and prefabricated bearing platform and construction method of structure |
| CN108589514B (en) * | 2018-05-06 | 2020-04-14 | 北京工业大学 | Bearing and earthquake-proof mechanism separated prefabricated assembled pier system |
| CN110054457B (en) * | 2019-04-29 | 2020-10-02 | 安徽建筑大学 | Steam-curing-free light-weight ultrahigh-performance concrete and preparation method thereof |
| CN110984207B (en) * | 2019-10-28 | 2023-04-14 | 上海市政工程设计研究总院（集团）有限公司 | Concrete member prefabricating and assembling quick connection structure |
| CN111444562B (en) * | 2020-03-13 | 2023-01-24 | 武汉理工大学 | Method for determining bearing capacity of light ultra-high performance concrete column under compression in axis |
| CN111501526A (en) * | 2020-03-26 | 2020-08-07 | 上海市政工程设计研究总院（集团）有限公司 | Socket type connecting structure of prefabricated bridge pier column and bearing platform and construction method |
| CN212561133U (en) * | 2020-08-11 | 2021-02-19 | 郑州大学 | Pier is assembled in prefabricated festival segmentation high-intensity district |
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