CN115098831A - Method for detecting and identifying beam bending resistance bearing capacity through loss reduction - Google Patents
Method for detecting and identifying beam bending resistance bearing capacity through loss reduction Download PDFInfo
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- CN115098831A CN115098831A CN202210839683.4A CN202210839683A CN115098831A CN 115098831 A CN115098831 A CN 115098831A CN 202210839683 A CN202210839683 A CN 202210839683A CN 115098831 A CN115098831 A CN 115098831A
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- 238000005452 bending Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 72
- 239000004567 concrete Substances 0.000 claims abstract description 27
- 230000002787 reinforcement Effects 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 230000006835 compression Effects 0.000 claims description 14
- 238000007906 compression Methods 0.000 claims description 14
- 230000003014 reinforcing effect Effects 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 6
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 4
- 238000012669 compression test Methods 0.000 description 2
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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 bending resistance bearing capacity of a beam by loss reduction, which is characterized in that a concrete compressive strength critical value of a reinforced concrete beam is inversely calculated, when the concrete compressive strength critical value of the reinforced concrete beam is lower than a constant value, the concrete compressive strength of the reinforced concrete beam does not need to be detected, and the bending resistance bearing capacity of the reinforced concrete beam can be identified only by comparing the beam bottom longitudinal reinforcement value of the bending resistance bearing capacity of the reinforced concrete beam with the detected beam bottom longitudinal reinforcement.
Description
Technical Field
The invention relates to the technical field of engineering detection, in particular to a method for detecting and identifying beam bending resistance bearing capacity through loss reduction.
Background
At present, the safety of a reinforced concrete house is identified, the bearing capacity of a reinforced concrete beam must be identified, the size of a component is surveyed on site, longitudinal reinforcing bars at the bottom of the reinforced concrete beam are detected, the concrete compressive strength of the reinforced concrete beam is detected, when the concrete compressive strength of the reinforced concrete beam is detected, surface plastering is rejected, and then rebound detection is carried out by using a resiliometer, or a core sample is extracted by using a core-pulling instrument and then sent to a laboratory for a compression test, so that the component of the house can be damaged, and labor and time are wasted.
Disclosure of Invention
The invention aims to solve at least one technical problem in the prior art and provides a method for detecting and identifying the bending resistance and the bearing capacity of a beam in a loss reduction way.
According to an aspect of the present invention, there is provided a method for impairment detection to identify beam bending load bearing capacity:
s2: measuring the section width b and the section height h of the reinforced concrete beam;
s4: detecting longitudinal reinforcing bars at the bottom of the reinforced concrete beam, detecting the longitudinal reinforcing bars at the bottom of the reinforced concrete beam by using an instrument, and verifying the size and the specification of the reinforcing bars by chiseling;
s6: by the formula six: calculating a design value M of bending moment in the span of the reinforced concrete beam, wherein K is the bending moment coefficient of the reinforced concrete beam, and taking a simple supporting beam as a conventional numerical value
q is a designed linear load value acting on the reinforced concrete beam, including a constant load and a live load, and l is a calculated span of the reinforced concrete beam;
s8: the formula I is as follows: alpha is alpha 1 f c bx＝f y A s -f’ y A’ s In which α is 1 Taking a fixed value of 1 when the concrete strength grade is less than or equal to C50, wherein fc is a concrete axle center compressive strength design value, x is the equivalent compression area height of the section of the reinforced concrete beam, A s 、A’ s The section areas of the longitudinal steel bars of the tension zone and the compression zone respectively, f y 、f’ y Respectively are the strength design values of tensile and compressive reinforcing steel bars,
the formula II is as follows: m ═ alpha 1 f c bx(h 0 -x/2)+f’ y A’ s (h 0 -a’ s ) Wherein h is 0 Is the effective height h of the section of the reinforced concrete beam 0 ＝h-a s ，a’ s The distance from the steel bar of the compression zone to the compression edge, a s For reinforcing steel bar in tension area to tensionThe distance of the edges is such that,
solving the formula I and the formula II to obtain a formula III:
s10: taking x ═ 2 a' s Calculating the concrete compressive strength critical value of the reinforced concrete beam, wherein the formula is as follows: fc ═ M/2 a' 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 or not;
s14: if the calculated concrete compression strength critical value of the reinforced concrete beam is obviously lower than a constant value, x is indicated<2a' s When x is less than or equal to 2 a' s And then, the tensioned steel bar takes distance to the stressed steel bar according to a formula four: a. the s ＝M/f y (h 0 -a’ s ) Further, the numerical value of the longitudinal steel bar at the bottom of the beam of the bending resistance bearing capacity of the reinforced concrete beam is obtained;
s16: and comparing the beam bottom longitudinal reinforcement value of the bending resistance bearing capacity of the reinforced concrete beam obtained in the step S14 with the beam bottom longitudinal reinforcement of the reinforced concrete beam obtained in the step S4, and thereby identifying the bending resistance bearing capacity of the beam.
Has the advantages that: the embodiment of the invention provides a method for detecting and identifying the bending resistance bearing capacity of a beam by loss reduction, which is characterized in that a concrete compressive strength critical value of a reinforced concrete beam is inversely calculated, when the concrete compressive strength critical value of the reinforced concrete beam is lower than a constant value, the concrete compressive strength of the reinforced concrete beam does not need to be detected, and whether the bending resistance bearing capacity of the reinforced concrete beam meets the requirement or not can be identified only by comparing the beam bottom longitudinal reinforcement value of the bending resistance bearing capacity of the reinforced concrete beam with the detected beam bottom longitudinal reinforcement.
According to the method for detecting and identifying the bending resistance and the bearing capacity of the beam by loss reduction, the compression width of the upper flange of the section of the T-shaped beam is taken when the reinforced concrete beam slab is integrally cast.
Drawings
The invention is further described with reference to the following figures and examples;
FIG. 1 is a flow chart of the steps of the method for detecting and identifying the flexural capacity of a beam in the loss reduction test of the present invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to, for example, upper, lower, front, rear, left, right, top, bottom, inner, outer, etc., is indicated based on the orientation or positional relationship shown in the drawings only for the convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, a plurality of means is one or more, a plurality of means is two or more, and greater than, less than, more than, etc. are understood as excluding the essential numbers, and greater than, less than, etc. are understood as including the essential numbers. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood 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 otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
At present, the safety of a reinforced concrete house is identified, the bearing capacity of a reinforced concrete beam must be identified, the size of a component is surveyed on site, longitudinal reinforcing bars at the bottom of the reinforced concrete beam are detected, the concrete compressive strength of the reinforced concrete beam is detected, when the concrete compressive strength of the reinforced concrete beam is detected, surface plastering is rejected, and then rebound detection is carried out by using a resiliometer, or a core sample is extracted by using a core-pulling instrument and then sent to a laboratory for a compression test, so that the component of the house can be damaged, and labor and time are wasted. Aiming at the defects, the invention provides a method for detecting and identifying the bending resistance bearing capacity of a beam by loss reduction, which can overcome the defects, save time and labor, save cost and improve efficiency.
Referring to fig. 1, a method for loss-reducing detection and identification of beam bending-resistant bearing capacity includes:
s2: measuring the section width b and the section height h of the reinforced concrete beam;
s4: detecting longitudinal reinforcing bars at the bottom of the reinforced concrete beam, detecting the longitudinal reinforcing bars at the bottom of the reinforced concrete beam by using an instrument, and verifying the size and the specification of the reinforcing bars by chiseling;
s6: by the formula six: calculating a design value M of bending moment in the span of the reinforced concrete beam, wherein K is the bending moment coefficient of the reinforced concrete beam, and taking a simple supporting beam as a conventional numerical value
q is a designed linear load value acting on the reinforced concrete beam, including a constant load and a live load, and l is a calculated span of the reinforced concrete beam;
s8: the formula I is as follows: alpha is alpha 1 f c bx＝f y A s -f’ y A’ s In which α is 1 Taking a fixed value of 1 when the concrete strength grade is less than or equal to C50, wherein fc is a concrete axle center compressive strength design value, x is the equivalent compression area height of the section of the reinforced concrete beam, A s 、A’ s The section areas of the longitudinal steel bars of the tension zone and the compression zone respectively, f y 、f’ y Respectively are the strength design values of tensile and compressive reinforcing steel bars,
the formula II is as follows: m ═ alpha 1 f c bx(h 0 -x/2)+f’ y A’ s (h 0 -a’ s ) Wherein h is 0 Is the effective height h of the section of the reinforced concrete beam 0 ＝h-a s ，a’ s The distance from the steel bar of the compression zone to the compression edge, a s The distance from the steel bar to the edge of tension in the tension area，
Solving the formula I and the formula II to obtain a formula III:
s10: taking x ═ 2 a' s Calculating the concrete compressive strength critical value of the reinforced concrete beam, wherein the formula is as follows: fc ═ M/2 a' 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 or not;
s14: if the calculated concrete compressive strength critical value of the reinforced concrete beam is obviously lower than a constant value, x is indicated<2a' s When x is less than or equal to 2 a' s And then, the tensioned steel bar takes distance to the stressed steel bar according to a formula four: a. the s ＝M/f y (h 0 -a’ s ) Further, the numerical value of the longitudinal steel bar at the bottom of the beam of the bending resistance bearing capacity of the reinforced concrete beam is obtained;
s16: and comparing the beam bottom longitudinal reinforcement value of the bending resistance bearing capacity of the reinforced concrete beam obtained in the step S14 with the beam bottom longitudinal reinforcement of the reinforced concrete beam obtained in the step S4, and thus identifying the bending resistance bearing capacity of the beam.
As will be readily appreciated, formula five is based on x ═ 2 a' s The critical value of time is known from the formula III, when fc is increased, x is reduced along with fc, namely when the concrete strength of the current situation is greater than the concrete compressive strength critical value of the reinforced concrete beam, x<2a’ s Without detecting fc, A can be obtained s 。
As will be readily appreciated, when calculating the height of the compression zone of the reinforced concrete beam to be less than 2 a' s And if the chiseled reinforced concrete beam bottom longitudinal reinforcing bar is smaller than the beam bottom longitudinal reinforcing bar 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 those skilled in the art without departing from the gist of the present invention.
Claims (2)
1. A method for detecting and identifying beam bending resistance bearing capacity through loss reduction is characterized by comprising the following steps:
s2: measuring the section width b and the section height h of the reinforced concrete beam;
s4: detecting longitudinal reinforcing bars at the bottom of the reinforced concrete beam, detecting the longitudinal reinforcing bars at the bottom of the reinforced concrete beam by using an instrument, and verifying the size and the specification of the reinforcing bars by chiseling;
s6: by the formula six: kql 2 Calculating a design value M of bending moment of the reinforced concrete beam span, wherein K is a bending moment coefficient of the reinforced concrete beam and a conventional numerical value, and taking a simply supported beam
q is a designed linear load value acting on the reinforced concrete beam, including a constant load and a live load, and l is a calculated span of the reinforced concrete beam;
s8: the formula I is as follows: alpha is alpha 1 f c bx＝f y A s -f y ’A’ s In which α is 1 Taking a fixed value of 1 when the concrete strength grade is less than or equal to C50, wherein fc is a concrete axle center compressive strength design value, x is the equivalent compression area height of the section of the reinforced concrete beam, A s 、A’ s The cross-sectional areas of the longitudinal reinforcements of the tension zone and the compression zone respectively, f y 、f y ' respectively are tensile strength and compressive strength design values of reinforcing steel bars,
the formula II is as follows: m ═ alpha 1 f c bx(h 0 -x/2)+f y ’A’ s (h 0 -a’ s ) Wherein h is 0 Is the effective height h of the section of the reinforced concrete beam 0 ＝h-a s ，a’ s The distance from the steel bar to the pressed edge of the pressed area, a s The distance from the steel bar in the tension area to the tension edge,
solving the formula I and the formula II to obtain a formula III:
s10: taking x-2 a' s Calculating the concrete compressive strength critical value of the reinforced concrete beam, wherein the formula is as follows: fc ═ M/2 a' 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 or not;
s14: if the calculated concrete compressive strength critical value of the reinforced concrete beam is obviously lower than a constant value, indicating that x is less than 2 a' s When x is less than or equal to 2 a' s In the process, the distance between the tensioned steel bar and the pressed steel bar is taken according to a formula IV: a. the s ＝M/f y (h 0 -a’ s ) Further, the numerical value of the longitudinal steel bar at the bottom of the beam of the bending resistance bearing capacity of the reinforced concrete beam is obtained;
s16: and comparing the beam bottom longitudinal reinforcement value of the bending resistance bearing capacity of the reinforced concrete beam obtained in the step S14 with the beam bottom longitudinal reinforcement of the reinforced concrete beam obtained in the step S4, and thereby identifying the bending resistance bearing capacity of the beam.
2. The method for loss reduction detection and beam bending resistance load identification as claimed in claim 1, wherein b is a compression width of an upper flange of a T-shaped beam section when the reinforced concrete beam slab is integrally cast.
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Citations (7)
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|---|---|---|---|---|
| US20090120025A1 (en) * | 2004-10-05 | 2009-05-14 | Halil Sezen | Prefabricated concrete reinforcement system |
| 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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- 2022-07-18 CN CN202210839683.4A patent/CN115098831B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090120025A1 (en) * | 2004-10-05 | 2009-05-14 | Halil Sezen | Prefabricated concrete reinforcement system |
| 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 |
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