CN115098831B - Method for detecting and identifying bending bearing capacity of beam by loss reduction - Google Patents
Method for detecting and identifying bending bearing capacity of beam by loss reduction Download PDFInfo
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- CN115098831B CN115098831B CN202210839683.4A CN202210839683A CN115098831B CN 115098831 B CN115098831 B CN 115098831B CN 202210839683 A CN202210839683 A CN 202210839683A CN 115098831 B CN115098831 B CN 115098831B
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- 238000005452 bending Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000011150 reinforced concrete Substances 0.000 claims description 73
- 239000004567 concrete Substances 0.000 claims description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- 230000002787 reinforcement Effects 0.000 claims description 14
- 230000006835 compression Effects 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 8
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 6
- 238000011065 in-situ storage Methods 0.000 claims description 2
- 230000006735 deficit Effects 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 description 7
- 238000012669 compression test Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
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Abstract
The invention discloses a method for detecting and identifying the beam bending resistance bearing capacity by impairment.
Description
Technical Field
The invention relates to the technical field of engineering detection, in particular to a method for detecting and identifying the bending resistance bearing capacity of a beam by loss reduction.
Background
At present, the safety of reinforced concrete houses is identified, the bearing capacity of the reinforced concrete beams is required to be identified, the sizes of components are surveyed on site, the longitudinal reinforcement of the bottom of the reinforced concrete beams is detected, the compressive strength of the reinforced concrete beams is detected, when the compressive strength of the reinforced concrete beams is detected, the surface plastering is removed, rebound detection is carried out by using a rebound instrument, or core samples are extracted by using a core pulling instrument and then sent to a laboratory for compression test, so that the house components are damaged, and the construction is also time-consuming.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art and provides a method for detecting and identifying the bending resistance bearing capacity of a beam by loss.
According to an embodiment of the invention, there is provided a method for impairment detection and qualification of beam bending load bearing capacity:
s2: measuring the section width b and the section height h of the reinforced concrete beam;
s4: detecting the longitudinal reinforcement of the beam bottom of the reinforced concrete beam, detecting the longitudinal reinforcement of the beam bottom of the reinforced concrete beam by using an instrument, and checking the size and the specification of the reinforced concrete beam by picking and chiseling;
s6: the formula six: m= Kql 2 Calculating a design value M of the mid-span bending moment of the reinforced concrete beam, wherein K is a bending moment coefficient of the reinforced concrete beam, a conventional value and a simply supported beamq is a design value of line load acting on the reinforced concrete beam, including constant load and live load, and l is a calculated span of the reinforced concrete beam;
s8: equation one: alpha 1 f c bx＝f y A s -f’ y A’ s Wherein alpha is 1 Taking the coefficient as a coefficient, taking a fixed value of 1 when the strength grade of the concrete is less than or equal to C50, fc as a design value of the compressive strength of the concrete axle center, x as the equivalent compression zone height of the reinforced concrete beam section, A s 、A’ s The cross-sectional areas of longitudinal steel bars in the tension zone and the compression zone respectively, f y 、f’ y Respectively the design values of the strength of the tensile and compressive reinforcing steel bars,
formula II: m=α 1 f c bx(h 0 -x/2)+f’ y A’ s (h 0 -a’ s ) Wherein h is 0 Effective height h of section of reinforced concrete beam 0 ＝h-a s ，a’ s A is the distance from the reinforcing steel bar of the pressed area to the pressed edge s For the distance of the tension zone rebar to the tension edge,
from formulas one and two, solving formula three:
s10: take x=2a '' s Calculating a concrete compressive strength critical value of the reinforced concrete beam, and adopting a formula five:
fc＝M/2a’ s b(h-2a’ s )；
s12: judging whether the calculated concrete compressive strength critical value of the reinforced concrete beam is lower than a constant value;
s14: if calculated reinforced concreteThe critical value of the compressive strength of the beam concrete is obviously lower than a constant value, which indicates x<2a' s When x is less than or equal to 2a' s And when the tension steel bar is used for taking the distance from the pressed steel bar, the following formula IV is adopted: a is that s ＝M/f y (h 0 -a’ s ) Further obtaining the numerical value of the longitudinal steel bars at the bottom of the reinforced concrete beam with bending resistance bearing capacity;
s16: and S14, comparing the numerical value of the longitudinal steel bars at the beam bottom of the reinforced concrete beam with the longitudinal steel bars at the beam bottom of the reinforced concrete beam obtained in the step S4, thereby identifying the beam bending resistance bearing capacity.
The beneficial effects are that: in one aspect, an embodiment of the invention provides a method for detecting and identifying beam bending resistance bearing capacity by impairment, which is used for reversely calculating a reinforced concrete beam concrete compressive strength critical value, and when the reinforced concrete beam concrete compressive strength critical value is lower than a constant value, the reinforced concrete beam concrete compressive strength is not required to be detected, and only the beam bottom longitudinal reinforcement value of the reinforced concrete beam bending resistance bearing capacity is obtained and compared with the detected reinforced concrete beam bottom longitudinal reinforcement, so that whether the reinforced concrete beam bending resistance bearing capacity meets the requirement can be identified.
According to the method for detecting and identifying the beam bending resistance bearing capacity by loss reduction according to the embodiment of the invention, when the reinforced concrete beam slab is cast in situ integrally, the compression width of the upper flange of the section of the T-shaped beam is taken.
Drawings
The invention is further illustrated by the following figures and examples;
FIG. 1 is a flowchart of the method steps for evaluating beam bending load capacity by loss detection according to the present invention.
Detailed Description
Reference will now be made in detail to the present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present invention, but not to limit the scope of the present invention.
In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, top, bottom, inside, outside, etc. are based on the orientation or positional relationship shown in the drawings, only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
At present, the safety of reinforced concrete houses is identified, the bearing capacity of the reinforced concrete beams is required to be identified, the sizes of components are surveyed on site, the longitudinal reinforcement of the bottom of the reinforced concrete beams is detected, the compressive strength of the reinforced concrete beams is detected, when the compressive strength of the reinforced concrete beams is detected, the surface plastering is removed, rebound detection is carried out by using a rebound instrument, or core samples are extracted by using a core pulling instrument and then sent to a laboratory for compression test, so that the house components are damaged, and the construction is also time-consuming. Aiming at the defects, the invention provides the method for reducing the bending resistance bearing capacity of the detection and identification beam, which can overcome the defects, save time and labor, save cost and improve efficiency.
Referring to fig. 1, a method for impairment detection and qualification of beam bending load bearing capacity includes:
s2: measuring the section width b and the section height h of the reinforced concrete beam;
s4: detecting the longitudinal reinforcement of the beam bottom of the reinforced concrete beam, detecting the longitudinal reinforcement of the beam bottom of the reinforced concrete beam by using an instrument, and checking the size and the specification of the reinforced concrete beam by picking and chiseling;
s6: the formula six: m= Kql 2 Calculating a design value M of the mid-span bending moment of the reinforced concrete beam, wherein K is a bending moment coefficient of the reinforced concrete beam, a conventional value and a simply supported beamq is a design value of line load acting on the reinforced concrete beam, including constant load and live load, and l is a calculated span of the reinforced concrete beam;
s8: equation one: alpha 1 f c bx＝f y A s -f’ y A’ s Wherein alpha is 1 Taking the coefficient as a coefficient, taking a fixed value of 1 when the strength grade of the concrete is less than or equal to C50, fc as a design value of the compressive strength of the concrete axle center, x as the equivalent compression zone height of the reinforced concrete beam section, A s 、A’ s The cross-sectional areas of longitudinal steel bars in the tension zone and the compression zone respectively, f y 、f’ y Respectively the design values of the strength of the tensile and compressive reinforcing steel bars,
formula II: m=α 1 f c bx(h 0 -x/2)+f’ y A’ s (h 0 -a’ s ) Wherein h is 0 Effective height h of section of reinforced concrete beam 0 ＝h-a s ，a’ s A is the distance from the reinforcing steel bar of the pressed area to the pressed edge s For the distance of the tension zone rebar to the tension edge,
from formulas one and two, solving formula three:
s10: take x=2a '' s Calculating a concrete compressive strength critical value of the reinforced concrete beam, and adopting a formula five:
fc＝M/2a’ s b(h-2a’ s )；
s12: judging whether the calculated concrete compressive strength critical value of the reinforced concrete beam is lower than a constant value;
S14：if the calculated concrete compressive strength critical value of the reinforced concrete beam is obviously lower than a constant value, x is shown<2a' s When x is less than or equal to 2a' s And when the tension steel bar is used for taking the distance from the pressed steel bar, the following formula IV is adopted: a is that s ＝M/f y (h 0 -a’ s ) Further obtaining the numerical value of the longitudinal steel bars at the bottom of the reinforced concrete beam with bending resistance bearing capacity;
s16: and S14, comparing the numerical value of the longitudinal steel bars at the beam bottom of the reinforced concrete beam with the longitudinal steel bars at the beam bottom of the reinforced concrete beam obtained in the step S4, thereby identifying the beam bending resistance bearing capacity.
As will be readily appreciated, equation five is based on x=2a '' s As can be seen from the formula three, x decreases as fc increases, that is, x is greater than the critical value of the compressive strength of the reinforced concrete beam concrete<2a’ s A can be obtained without detecting fc s 。
It is easy to understand that when the compressed area height of the reinforced concrete beam is calculated to be less than 2a' s When the longitudinal reinforcement of the beam bottom of the on-site chiseled reinforced concrete beam is larger than the beam bottom longitudinal reinforcement value of the reinforced concrete beam bending resistance bearing capacity calculated according to the formula IV, the reinforced concrete beam bending resistance bearing capacity meets the requirement, and when the longitudinal reinforcement of the beam bottom of the chiseled reinforced concrete beam is smaller than the beam bottom longitudinal reinforcement value of the reinforced concrete beam bending resistance bearing capacity calculated according to the formula IV, the reinforced concrete beam bending resistance bearing capacity does not meet the requirement.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention.
Claims (2)
1. The method for detecting and identifying the beam bending resistance bearing capacity by loss is characterized by comprising the following steps of:
s2: measuring the section width b and the section height h of the reinforced concrete beam;
s4: detecting the longitudinal reinforcement of the beam bottom of the reinforced concrete beam, detecting the longitudinal reinforcement of the beam bottom of the reinforced concrete beam by using an instrument, and checking the size and the specification of the reinforced concrete beam by picking and chiseling;
s6: the formula six: m= Kql 2 Calculating a design value M of a mid-span bending moment of the reinforced concrete beam, wherein K is a bending moment coefficient of the reinforced concrete beam, a conventional value, and a simply supported beam takes K=1/8,q as a design value of a line load acting on the reinforced concrete beam, wherein the design value comprises a constant load and a live load, and l is a calculated span of the reinforced concrete beam;
s8: equation one: alpha 1 f c bx＝f y A s -f’ y A’ s Wherein alpha is 1 Taking the concrete strength grade as a coefficient and taking a fixed value of 1 and f when the concrete strength grade is less than or equal to C50 c The design value of the compressive strength of the concrete axis is that x is the equivalent compression zone height of the reinforced concrete beam section, A s 、A’ s The cross-sectional areas of longitudinal steel bars in the tension zone and the compression zone respectively, f y 、f’ y Respectively the design values of the strength of the tensile and compressive reinforcing steel bars,
formula II: m=α 1 f c bx(h 0 -x/2)+f’ y A’ s (h 0 -a’ s ) Wherein h is 0 Effective height h of section of reinforced concrete beam 0 ＝h-a s ，a’ s A is the distance from the reinforcing steel bar of the pressed area to the pressed edge s For the distance of the tension zone rebar to the tension edge,
from formulas one and two, solving formula three:
s10: take x=2a '' s Calculating a concrete compressive strength critical value of the reinforced concrete beam, and adopting a formula five: f (f) c ＝M/2a’ s b(h-2a’ s )；
S12: judging whether the calculated concrete compressive strength critical value of the reinforced concrete beam is lower than a constant value;
s14: if the calculated concrete compressive strength critical value of the reinforced concrete beam is obviously lower than a constant value, x is shown<2a’ s When x is less than or equal to2a’ s And when the tension steel bar is used for taking the distance from the pressed steel bar, the following formula IV is adopted: a is that s ＝M/f y (h 0 -a’ s ) Further obtaining the numerical value of the longitudinal steel bars at the bottom of the reinforced concrete beam with bending resistance bearing capacity;
s16: and S14, comparing the numerical value of the longitudinal steel bars at the beam bottom of the reinforced concrete beam with the longitudinal steel bars at the beam bottom of the reinforced concrete beam obtained in the step S4, thereby identifying the beam bending resistance bearing capacity.
2. The method for detecting and identifying the bending load capacity of a beam according to claim 1, wherein b is the compression width of the upper flange of the section of the T-shaped beam when the reinforced concrete beam slab is cast in situ integrally.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2674418C1 (en) * | 2017-12-05 | 2018-12-07 | федеральное государственное бюджетное образовательное учреждение высшего образования "Самарский государственный технический университет" | Method for assessing fire resistance of monolithic reinforced concrete beam slabs of interior surfaces of buildings |
| CN110441140A (en) * | 2019-07-15 | 2019-11-12 | 郑州大学 | The analysis method of stainless reinforced column stress performance |
| CN112131641A (en) * | 2020-09-16 | 2020-12-25 | 武汉理工大学 | Method for determining flexural capacity of lightweight ultrahigh-performance concrete beam |
| CN112632667A (en) * | 2020-12-18 | 2021-04-09 | 同济大学 | Simplified calculation method for bending resistance bearing capacity of normal section of rusted reinforced concrete beam |
| CN113536419A (en) * | 2021-06-25 | 2021-10-22 | 武汉理工大学 | Method for determining anti-bending bearing capacity of FRP (fiber reinforced plastic) section bar reinforced existing reinforced concrete beam |
| CN113536418A (en) * | 2021-06-25 | 2021-10-22 | 武汉理工大学 | Method for determining bending resistance bearing capacity of prestressed light ultra-high performance concrete beam |
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| US20090120025A1 (en) * | 2004-10-05 | 2009-05-14 | Halil Sezen | Prefabricated concrete reinforcement system |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2674418C1 (en) * | 2017-12-05 | 2018-12-07 | федеральное государственное бюджетное образовательное учреждение высшего образования "Самарский государственный технический университет" | Method for assessing fire resistance of monolithic reinforced concrete beam slabs of interior surfaces of buildings |
| CN110441140A (en) * | 2019-07-15 | 2019-11-12 | 郑州大学 | The analysis method of stainless reinforced column stress performance |
| CN112131641A (en) * | 2020-09-16 | 2020-12-25 | 武汉理工大学 | Method for determining flexural capacity of lightweight ultrahigh-performance concrete beam |
| CN112632667A (en) * | 2020-12-18 | 2021-04-09 | 同济大学 | Simplified calculation method for bending resistance bearing capacity of normal section of rusted reinforced concrete beam |
| CN113536419A (en) * | 2021-06-25 | 2021-10-22 | 武汉理工大学 | Method for determining anti-bending bearing capacity of FRP (fiber reinforced plastic) section bar reinforced existing reinforced concrete beam |
| CN113536418A (en) * | 2021-06-25 | 2021-10-22 | 武汉理工大学 | Method for determining bending resistance bearing capacity of prestressed light ultra-high performance concrete beam |
Non-Patent Citations (1)
| Title |
|---|
| 混凝土对称配筋梁的抗弯承载力分析与计算;郭军庆;熊二刚;杨坤;;长安大学学报(自然科学版)(第05期);第72-76页 * |
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