CN116186862B - Design method of frame beam and straight barrel hinged connection node anchor bar of outer steel frame and water tower inner straight barrel combined support system - Google Patents
Design method of frame beam and straight barrel hinged connection node anchor bar of outer steel frame and water tower inner straight barrel combined support system Download PDFInfo
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- CN116186862B CN116186862B CN202310262013.5A CN202310262013A CN116186862B CN 116186862 B CN116186862 B CN 116186862B CN 202310262013 A CN202310262013 A CN 202310262013A CN 116186862 B CN116186862 B CN 116186862B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 28
- 239000010959 steel Substances 0.000 title claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 238000013461 design Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000005452 bending Methods 0.000 claims abstract description 15
- 238000004873 anchoring Methods 0.000 claims abstract description 13
- 238000006073 displacement reaction Methods 0.000 claims abstract 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 6
- 238000010008 shearing Methods 0.000 claims description 5
- 238000012937 correction Methods 0.000 claims description 2
- 238000004458 analytical method Methods 0.000 abstract 2
- 238000010276 construction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000002435 tendon Anatomy 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/30—Water-towers
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/02—Structures made of specified materials
- E04H12/08—Structures made of specified materials of metal
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/02—Reliability analysis or reliability optimisation; Failure analysis, e.g. worst case scenario performance, failure mode and effects analysis [FMEA]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Architecture (AREA)
- Theoretical Computer Science (AREA)
- Geometry (AREA)
- General Physics & Mathematics (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Computer Hardware Design (AREA)
- General Engineering & Computer Science (AREA)
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- Computational Mathematics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- Wood Science & Technology (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Reinforcement Elements For Buildings (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
The invention belongs to the field of civil engineering, and relates to a design method of a frame beam and straight barrel hinged connection node anchor bar of an outer steel frame and water tower inner straight barrel combined support system. The anchor bar comprises a bending section and a flat section, the bending section is horizontally arranged and welded with the two sides of the fixed steel bar, and the limiting plate is arranged to limit the displacement of the anchor bar. The design method comprises the following steps: firstly, selecting the diameter and the row number of the steel bars for anchoring; calculating the total cross-sectional area of the anchor bars according to a formula according to the stress condition of the frame beam end; determining the anchoring length of the anchor bar; determining the lengths of the anchor bar straight section and the bending section; the diameter and length of the fixed rebar are determined. The invention provides a reliable analysis method for the design of the anchor bars of the joint connection joints of the frame beam and the straight tube in the combined support system of the outer steel frame and the straight tube in the water tower, and provides a reliable analysis method for the design of the anchor bars of the joint connection areas in the water tower support system.
Description
Technical Field
The invention belongs to the field of civil engineering, and particularly relates to a design method of a frame beam and straight barrel hinged connection node anchor bar of an outer steel frame and water tower inner straight barrel combined support system.
Background
In industrial and civil buildings, a water tower is used as a high-rise water distribution structure, high-altitude operation is needed in the construction process of a water tank at the top of the water tower, the construction difficulty is high, a proper formwork support system is usually arranged, the stability of the support system is mainly ensured by reliable connection of a straight cylinder and the support system, and anchor bars are usually used as connecting pieces, so that the design of the anchor bars on the straight cylinder of the water tower is crucial to the stability of the support system.
The prior anchor bar design method in China generally determines the cross-section area of the anchor bar according to the stress condition and the anchor plate specification, and determines the anchoring length of the anchor bar according to the appearance coefficient of the anchor bar, the diameter of the reinforcing steel bar, the tensile strength design value of the reinforcing steel bar and the tensile strength design value of the concrete shaft center, but the thickness of the wall of the water tower is far smaller than the anchoring length calculated by the conventional method.
Disclosure of Invention
The invention provides a design method of a frame beam and straight barrel hinged connection node anchor bar of an outer steel frame and water tower inner straight barrel combined support system, aiming at the defect of the design method of the straight barrel anchor bar of the water tower.
In order to achieve the above object, the present invention comprises the steps of:
Step one: selecting a diameter d and a row number n of reinforcing steel bars for anchoring;
Step two: the total cross-sectional area of the anchor bars in the node area of the beam end of the frame is calculated according to the following formula:
β＝1-0.137ln(n-1) (4)
Wherein: a s is the total cross-sectional area of the anchor bar; alpha v is the shear bearing capacity coefficient of the anchor bar; alpha b is the deformation reduction coefficient of the anchor plate; f y is the design value of the tensile strength of the anchor bar; v is a shearing force standard value; n is a tensile force standard value; m is a bending moment standard value; z is the distance between the center lines of the outermost anchor bars along the shearing action direction; f c is the compressive strength of the concrete axle center; d is the diameter of the anchor bar; t is the thickness of the anchor plate; beta is the anchor bar row number influence coefficient; n is the number of anchor bar rows, which is not less than two rows;
Step three: the anchoring length of the anchor bar is calculated by the following formula:
Wherein: l is the anchoring length of the anchor bar; alpha is the surface coefficient of the anchor bar, 0.16 is taken by a smooth round steel bar, and 0.14 is taken by a ribbed steel bar; f t is the design value of the tensile strength of the concrete axle center; η is an anchor bar diameter influence coefficient, 1.0 is taken when d is less than or equal to 25mm, and 1.2 is taken when d is more than 25 mm; lambda is an anti-seismic correction coefficient of the anchor bar, 1.15 is taken for the first-level anti-seismic grade and the second-level anti-seismic grade, 1.05 is taken for the third-level anti-seismic grade, and 1.00 is taken for the fourth-level anti-seismic grade;
Step four: the lengths of the straight section and the bending section of the anchor bar are calculated according to the following formula:
lb≤T-min(6d，70mm) (6)
lc≥5d (7)
Wherein: t is the thickness of a straight cylinder of the water tower; l b is the length of the anchor bar straight section; l c is the length of the bending section of the anchor bar;
Step five: the fixed rebar length was calculated according to the following formula:
Wherein: d 0 is the diameter of a fixed reinforcing steel bar, and d 0 is generally equal to or more than d; l is the length of the fixed steel bar.
The invention has the beneficial effects that: the influence of the row number on the anchor bars is considered, so that the method has good economical efficiency; the length of the bending section and the straight section of the anchor bar is determined, and the anchoring length of the anchor bar is ensured; the limiting plate plays a role in fixing the relative positions of the anchor bars; the arranged fixed steel bars have auxiliary stress effect on the anchor bars; the method provides a reasonable and reliable design method for practical engineering application of the anchor bars in the combined support system of the outer steel frame and the inner straight cylinder of the water tower.
Drawings
FIG. 1 is a schematic elevation view of a connecting node according to an embodiment of the present invention;
FIG. 2 is a schematic side view of a connection node according to an embodiment of the present invention;
FIG. 3 is a schematic plan view of a connection node according to an embodiment of the present invention;
fig. 4 is a schematic illustration of the details of the tendon.
In the figure: the steel column comprises a straight cylinder wall of a water column, a fixed steel bar, a3 anchor bar, a 31 anchor bar straight section, a 32 anchor bar bending section, a 4 limit plate, a5 anchor plate and a6 outer steel frame beam.
Detailed Description
The invention is further described below by referring to the attached drawings, wherein the design example of the frame beam and straight barrel hinged connection node anchor bar of the combined support system of the outer steel frame and the straight barrel in the water tower.
Examples
A design method of a frame beam and straight barrel hinged connection node anchor bar of an outer steel frame and inner straight barrel combined support system of a water tower is characterized in that a bending section of the anchor bar is horizontally arranged and welded with two sides of a fixed steel bar; taking a certain water tower project of Sai-in-Gal as an example, the water tower is a stress system formed by combining a steel frame support and a vertical concrete cylinder wall of the water tower, the anti-seismic grade is three-level, the total height of the straight cylinder is 40.7 m, the concrete grade of the water tower is C30, the steel grade is Q355B, the anchor bar is ribbed HRB335, the tensile strength design value is 300MPa, the wall thickness of the straight cylinder of the water tower is 300mm, the model of a steel beam is HM500 multiplied by 300 multiplied by 11 multiplied by 18, the size of a limiting plate is 370 multiplied by 690 multiplied by 6mm, and the size of the anchor plate is 370 multiplied by 690 multiplied by 20mm.
The design method of the frame beam and straight barrel hinged connection node anchor bar of the outer steel frame and straight barrel combined support system in the water tower comprises the following steps:
step one: selecting a rebar diameter d=27 mm and a row number n=4 for anchoring;
Step two: the standard value of the shearing force of the anchor bar in the beam end node area is 392.649kN, the standard value of the pulling force is 10.638kN, the standard value of the bending moment is 62.824 kN.m, the total cross-sectional area A s≥5627.34mm2 of the anchor bar is calculated according to formulas (1) to (4), and the arrangement of the anchor bar is shown in figures 1 to 3;
Step three: calculating the anchoring length l of the anchor bar according to the formula (5) to be more than or equal to 848.34mm, and taking l=870 mm;
Step four: calculating the lengths of the anchor bar straight section and the bending section according to the formula (6) and the formula (7):
lb≤T-min(6d，70mm)≤300-min(162，70mm)＝230mm
lc≥5d≥135mm
let l b＝230mm,lc = 140mm;
Step five: taking d 0 =d, the fixed rebar length l=540 mm is calculated according to formula (8).
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that the invention is not limited to the particular embodiments, but is capable of numerous modifications and variations within the spirit and scope of the invention.
Claims (1)
1. The design method of the frame beam and straight tube hinged connection node anchor bar of the outer steel frame and water tower inner straight tube combined support system is characterized in that the anchor bar bending section is horizontally arranged and welded with the double sides of the fixed steel bar, the limit plate is arranged to limit the anchor bar displacement, and the calculation comprises the following steps:
Step one: selecting a diameter d and a row number n of reinforcing steel bars for anchoring;
Step two: the total cross-sectional area of the anchor bars in the node area of the beam end of the frame is calculated according to the following formula:
β＝1-0.137ln(n-1) (4)
Wherein: a s is the total cross-sectional area of the anchor bar; alpha v is the shear bearing capacity coefficient of the anchor bar; alpha b is the deformation reduction coefficient of the anchor plate; f y is the design value of the tensile strength of the anchor bar; v is a shearing force standard value; n is a tensile force standard value; m is a bending moment standard value; z is the distance between the center lines of the outermost anchor bars along the shearing action direction; f c is the compressive strength of the concrete axle center; d is the diameter of the anchor bar; t is the thickness of the anchor plate; beta is the anchor bar row number influence coefficient; n is the number of anchor bar rows, which is not less than two rows;
Step three: the anchoring length of the anchor bar is calculated by the following formula:
Wherein: l is the anchoring length of the anchor bar; alpha is the surface coefficient of the anchor bar, 0.16 is taken by a smooth round steel bar, and 0.14 is taken by a ribbed steel bar; f t is the design value of the tensile strength of the concrete axle center; η is an anchor bar diameter influence coefficient, 1.0 is taken when d is less than or equal to 25mm, and 1.2 is taken when d is more than 25 mm; lambda is an anti-seismic correction coefficient of the anchor bar, 1.15 is taken for the first-level anti-seismic grade and the second-level anti-seismic grade, 1.05 is taken for the third-level anti-seismic grade, and 1.00 is taken for the fourth-level anti-seismic grade;
Step four: the lengths of the straight section and the bending section of the anchor bar are calculated according to the following formula:
lb≤T-min(6d，70mm) (6)
lc≥5d (7)
Wherein: t is the thickness of a straight cylinder of the water tower; l b is the length of the anchor bar straight section; l c is the length of the bending section of the anchor bar;
Step five: the fixed rebar length was calculated according to the following formula:
Wherein: d 0 is the diameter of a fixed reinforcing steel bar, and d 0 is generally equal to or more than d; l is the length of the fixed steel bar.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310262013.5A CN116186862B (en) | 2023-03-17 | 2023-03-17 | Design method of frame beam and straight barrel hinged connection node anchor bar of outer steel frame and water tower inner straight barrel combined support system |
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| CN202310262013.5A CN116186862B (en) | 2023-03-17 | 2023-03-17 | Design method of frame beam and straight barrel hinged connection node anchor bar of outer steel frame and water tower inner straight barrel combined support system |
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| CN116186862B true CN116186862B (en) | 2024-05-10 |
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| US20230011084A1 (en) * | 2021-07-12 | 2023-01-12 | Frore Systems Inc. | Cooling element architecture for mems-based cooling system architecture |
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