KR20120022144A - Measuring method for residual stress of concrete structure - Google Patents

Measuring method for residual stress of concrete structure Download PDF

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KR20120022144A
KR20120022144A KR1020100085340A KR20100085340A KR20120022144A KR 20120022144 A KR20120022144 A KR 20120022144A KR 1020100085340 A KR1020100085340 A KR 1020100085340A KR 20100085340 A KR20100085340 A KR 20100085340A KR 20120022144 A KR20120022144 A KR 20120022144A
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groove
residual stress
concrete structure
measuring
groove forming
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KR1020100085340A
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Korean (ko)
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이호범
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주식회사 쓰리텍
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/14—Measuring arrangements characterised by the use of optical techniques for measuring distance or clearance between spaced objects or spaced apertures

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  • General Physics & Mathematics (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

PURPOSE: A residual stress measuring method of a concrete structure is provided to effectively calculate an exact measured value even though the external force is not eliminated. CONSTITUTION: A residual stress measuring method of a concrete structure is as follows. A stress member(1) in the state that the stress generates is selected. Mark a groove forming unit and a plurality of marking units(20). A measured value before forming grooves is obtained by measuring a distance between the marking units. Grooves are formed with respect to the groove forming unit. A measured value after forming grooves is obtained by measuring a distance between the marking units and groove forming unit. The values before forming grooves and after forming grooves are compared to each other so that a deflection is calculated. The residual stress of the selected member is calculated from the displacement.

Description

콘크리트 구조물의 잔류응력 측정방법{MEASURING METHOD FOR RESIDUAL STRESS OF CONCRETE STRUCTURE}Residual stress measurement method of concrete structure {MEASURING METHOD FOR RESIDUAL STRESS OF CONCRETE STRUCTURE}

본 발명은 건설 계측분야에 관한 것으로서, 상세하게는 콘크리트 구조물의 잔류응력을 측정하기 위한 방법에 관한 것이다.The present invention relates to the field of construction metrology, and more particularly, to a method for measuring the residual stress of a concrete structure.

잔류응력(residual stress)이란 외력에 의해 응력이 발생한 상태의 구조물에서 외력을 제거한 경우, 구조물의 내부에 잔류하는 응력(외력의 제거에 불구하고 완전히 소멸되지 않은 응력)을 말한다.Residual stress is a stress remaining inside the structure (stress that is not completely destroyed despite the removal of the external force) when the external force is removed from the structure in which the stress is generated by the external force.

건설 구조물에 있어서 이러한 잔류응력은 구조적 안정성을 평가하기 위한 주된 인자 중의 하나로서, 잔존수명을 예측하기 위하여 반드시 필요한 인자라 할 수 있다.In the construction structure, such residual stress is one of the main factors for evaluating the structural stability, which is necessary to predict the remaining life.

그런데, 일반적인 건설 구조물의 경우, 지속적인 외력을 받는 상태에 있고, 그 외력을 제거하는 것이 사실상 불가능하므로, 잔류응력의 측정이 대단히 어렵다는 문제가 있다.By the way, in the case of a general construction structure, it is in a state of receiving a constant external force, and since it is virtually impossible to remove the external force, there is a problem that measurement of residual stress is very difficult.

나아가, 콘크리트 구조물의 경우, 강재 등과 같이 내부의 구성성분이 일정하게 분포되어 있지 않으므로, 종래의 압입 시험방법 등에 의하더라도 정확한 잔류응력의 측정이 어렵다는 문제가 있다.Furthermore, in the case of concrete structures, since internal components are not uniformly distributed, such as steel, there is a problem that accurate residual stress is difficult to measure even by a conventional indentation test method.

본 발명은 상기와 같은 문제점을 해결하기 위하여 도출된 것으로서, 콘크리트 구조물에서 외력을 제거하지 않으면서도 효과적으로 정확한 측정값의 도출을 가능하게 하는 콘크리트 구조물의 잔류응력 측정방법을 제시하는 것을 그 목적으로 한다.The present invention has been made to solve the above problems, and an object of the present invention is to propose a method for measuring residual stress of a concrete structure that enables effective derivation of accurate measured values without removing external forces from the concrete structure.

상기 과제의 해결을 위하여, 본 발명은 콘크리트 구조물 중 외력에 의해 응력이 발생하고 있는 상태의 부재(1)를 선정하는 단계; 상기 선정된 부재(1)의 일면에 대하여, 홈형성부(10) 및 복수의 표시부(20)를 표시하는 단계; 상기 복수의 표시부(20) 사이의 거리를 측정하여 홈형성 전 측정값을 획득하는 홈형성 전 측정단계; 상기 홈형성부(10)에 대하여 홈을 형성하는 단계; 상기 홈이 형성된 홈형성부(10)와 상기 표시부(20) 사이의 거리를 측정하여 홈형성 후 측정값을 획득하는 홈형성 후 측정단계; 상기 홈형성 전 측정값과 상기 홈형성 후 측정값을 상호 비교하여 변위를 계산하는 단계; 상기 변위로부터 상기 선정된 부재(1)의 잔류응력을 계산하는 단계;를 포함하는 것을 특징으로 하는 콘크리트 구조물의 잔류응력 측정방법을 제시한다.In order to solve the above problems, the present invention comprises the steps of selecting a member (1) in a state where a stress is generated by the external force of the concrete structure; Displaying a groove forming portion (10) and a plurality of display portions (20) on one surface of the selected member (1); A pre-groove measurement step of measuring a distance between the plurality of display units 20 to obtain a pre-groove measurement value; Forming a groove in the groove forming unit (10); A post groove forming step of measuring a distance between the groove forming unit 10 in which the groove is formed and the display unit 20 to obtain a measured value after forming the groove; Calculating displacement by comparing the measured value before the groove formation and the measured value after the groove formation; Calculating the residual stress of the selected member (1) from the displacement proposes a method of measuring the residual stress of the concrete structure.

상기 홈형성부(10)는 하나이고, 상기 표시부(20)는 상기 홈형성부(10)를 중심으로 복수의 방향에 형성된 것이 바람직하다.The groove forming unit 10 may be one, and the display unit 20 may be formed in a plurality of directions about the groove forming unit 10.

상기 표시부(20)는 상기 홈형성부(10)를 중심으로 상하좌우의 4방향에 형성된 것이 바람직하다.The display unit 20 is preferably formed in four directions of up, down, left, and right around the groove forming unit 10.

상기 표시부(20)는 상기 홈형성부(10)를 중심으로 상하좌우 및 그 사이 영역을 포함하는 8방향에 형성된 것이 바람직하다.The display unit 20 is preferably formed in eight directions including the top, bottom, left and right and the area therebetween with respect to the groove forming unit 10.

상기 표시부(20)는 상기 복수의 방향에 대하여 각각 복수가 형성된 것이 바람직하다.Preferably, the display unit 20 is provided in plurality in the plurality of directions.

상기 홈형성 전 측정단계 및 홈형성 후 측정단계는 3D 광학 스캐너에 의해 수행되는 것이 바람직하다.The measuring step before the groove formation and the measuring step after the groove formation are preferably performed by a 3D optical scanner.

본 발명은 콘크리트 구조물에서 외력을 제거하지 않으면서도 효과적으로 정확한 측정값의 도출을 가능하게 하는 콘크리트 구조물의 잔류응력 측정방법을 제시한다.The present invention proposes a method for measuring residual stress of a concrete structure that enables effective derivation of accurate measured values without removing external force from the concrete structure.

도 1 이하는 본 발명에 의한 측정방법의 실시예를 설명하기 위한 것으로서,
도 1은 제1실시예에 관한 개념도.
도 2는 제2실시예에 관한 개념도.
도 3은 제3실시예에 관한 개념도.
도 4 내지 9는 광학 스캐너를 이용하여 측정방법을 수행한 데이터에 관한 사진.1 is for explaining an embodiment of the measuring method according to the present invention,
1 is a conceptual diagram according to a first embodiment.
2 is a conceptual diagram according to a second embodiment.
3 is a conceptual diagram according to a third embodiment.
4 to 9 are photographs of data on which a measuring method is performed using an optical scanner.

이하, 첨부도면을 참조하여 본 발명의 실시예에 관하여 상세히 설명한다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1 이하에 도시된 바와 같이, 본 발명에 의한 잔류응력 측정방법은 다음과 같은 단계에 의해 구성된다.As shown in Figure 1, the residual stress measuring method according to the present invention is configured by the following steps.

콘크리트 구조물 중 외력에 의해 응력이 발생하고 있는 상태의 부재(1)를 선정하고, 선정된 부재(1)의 일면에 대하여, 홈형성부(10) 및 복수의 표시부(20)를 표시한다.The member 1 in a state in which stress is generated by an external force in the concrete structure is selected, and the groove forming portion 10 and the plurality of display portions 20 are displayed on one surface of the selected member 1.

홈형성부(10)에 대하여 홈을 형성하기 전, 먼저 복수의 표시부(20) 사이의 거리(l)를 측정하여 홈형성 전 측정값을 획득한다.Before the groove is formed in the groove forming unit 10, first, the distance l between the plurality of display units 20 is measured to obtain a measurement value before forming the groove.

이후, 홈형성부(10)에 대하여 홈을 형성하는데, 콘크리트의 표면에 이와 같이 홈을 형성하면, 그 표면에 존재하던 응력이 소멸되므로, 부분적으로 외력이 제거되는 효과를 얻을 수 있다.Thereafter, a groove is formed in the groove forming unit 10. If the groove is formed on the surface of the concrete in this manner, the stress existing on the surface of the groove is eliminated, so that an external force can be partially removed.

홈이 형성된 홈형성부(10)와 표시부(20) 사이의 거리(l)를 측정하여 홈형성 후 측정값을 획득하는데, 상술한 바와 같이 홈의 형성에 의해 콘크리트 표면의 응력이 소멸되었으므로, 복수의 표시부(20) 사이의 거리는 소정 늘어난 값을 나타내게 된다.After measuring the distance l between the groove forming portion 10 and the display portion 20 in which the groove is formed, a measured value is obtained after the groove is formed. As described above, since the stress on the concrete surface is eliminated by the formation of the groove, The distance between the display units 20 will indicate a predetermined increased value.

상술한 홈형성 전 측정값과 홈형성 후 측정값을 상호 비교하여 변위(위 늘어난 값)를 계산하고, 이로부터 선정된 부재(1)의 잔류응력을 계산할 수 있다.By comparing the measured value before the groove formation and the measured value after the groove formation described above, the displacement (the increased value) can be calculated, and the residual stress of the selected member 1 can be calculated therefrom.

따라서 본 발명에 의한 측정방법은 콘크리트 구조물에 대한 손상을 최소화하고(사실상 비파괴), 외력을 제거하지 않으면서도 정확히 잔류응력을 측정할 수 있다는 효과가 있다.Therefore, the measuring method according to the present invention has the effect of minimizing damage to the concrete structure (virtually non-destructive) and accurately measuring residual stress without removing external force.

콘크리트의 표면을 손상시키는 홈형성부(10)는 최소(하나)로 하는 것이 좋고, 의미 있는 측정값의 획득을 위하여 표시부(20)는 홈형성부(10)를 중심으로 복수의 방향에 형성되는 것이 바람직하다(도 2).The groove forming portion 10 that damages the surface of the concrete is preferably minimized (one), and in order to obtain meaningful measurement values, the display portion 20 is formed in a plurality of directions about the groove forming portion 10. It is preferable (FIG. 2).

표시부(20)가 홈형성부(10)를 중심으로 상하좌우의 4방향에 형성되는 경우, 콘크리트 구조물에 대한 외력의 재하방향과 관계없이 실제 잔류응력에 가까운 측정값을 얻을 수 있다는 효과가 있다(도 2).When the display unit 20 is formed in four directions of up, down, left, and right around the groove forming unit 10, there is an effect that a measured value close to the actual residual stress can be obtained regardless of the loading direction of the external force on the concrete structure ( 2).

표시부(20)가 홈형성부(10)를 중심으로 상하좌우 및 그 사이 영역을 포함하는 8방향에 형성되는 경우, 위 효과를 더욱 크게 얻을 수 있다(도 3).When the display unit 20 is formed in eight directions including up, down, left, right, and regions therebetween with respect to the groove forming unit 10, the above effect can be obtained even more (FIG. 3).

표시부(20)가 복수의 방향에 대하여 각각 복수가 형성되는 경우, 각 방향에 대한 측정값의 차이가 날 수 있는데, 이로부터 외력의 재하 방향, 구조물의 처짐 방향 등을 추정할 수 있다는 장점이 추가된다(도 2,3).When the display unit 20 is provided with a plurality of directions for each of the plurality of directions, there may be a difference in the measured values for each direction, from which the advantage that the load direction of the external force, the deflection direction of the structure can be estimated. (FIGS. 2 and 3).

상술한 홈형성 전후의 측정작업은 일반적인 변위 측정기구에 의해 수행될 수도 있으나, 3D 광학 스캐너를 이용하는 경우, 더욱 편리하면서도 정확한 측정값을 얻을 수 있다.Before and after the above-mentioned groove formation measurement may be performed by a general displacement measuring mechanism, when using a 3D optical scanner, more convenient and accurate measurement value can be obtained.

도 4 내지 9는 3D 광학 스캐너를 이용하여 본 발명에 의한 측정방법을 수행한 데이터에 관한 사진으로서, 도 4는 초기값, 도 5 내지 8은 각각 50mm, 100mm, 150mm, 200mm를 천공한 경우에 관한 것이다.4 to 9 are photographs showing data of performing a measuring method according to the present invention using a 3D optical scanner, and FIG. 4 is an initial value, and FIGS. 5 to 8 respectively show 50 mm, 100 mm, 150 mm, and 200 mm perforations. It is about.

도 9는 400mm를 천공한 경우로서 부재가 관통된 경우에 관한 것이다.9 relates to a case in which the member is penetrated as the case where 400 mm is drilled.

시험 결과, 천공깊이(홈형성 깊이)를 굳이 크게 하지 않고, 50 ~ 100mm 정도로 하더라도 충분히 의미 있는 데이터를 얻을 수 있는 것으로 나타났다.As a result of the test, it was found that sufficient data could be obtained even with 50 to 100 mm without increasing the depth of drilling (groove depth).

이상은 본 발명에 의해 구현될 수 있는 바람직한 실시예의 일부에 관하여 설명한 것에 불과하므로, 주지된 바와 같이 본 발명의 범위는 위의 실시예에 한정되어 해석되어서는 안 될 것이며, 위에서 설명된 본 발명의 기술적 사상과 그 근본을 함께 하는 기술적 사상은 모두 본 발명의 범위에 포함된다고 할 것이다.Since the above has been described only with respect to some of the preferred embodiments that can be implemented by the present invention, the scope of the present invention, as is well known, should not be construed as limited to the above embodiments, the present invention described above It will be said that both the technical idea and the technical idea which together with the base are included in the scope of the present invention.

1 : 콘크리트 부재 10 : 홈형성부
20 : 표시부1: concrete member 10: groove forming portion
20: display unit

Claims (6)

콘크리트 구조물 중 외력에 의해 응력이 발생하고 있는 상태의 부재(1)를 선정하는 단계;
상기 선정된 부재(1)의 일면에 대하여, 홈형성부(10) 및 복수의 표시부(20)를 표시하는 단계;
상기 복수의 표시부(20) 사이의 거리를 측정하여 홈형성 전 측정값을 획득하는 홈형성 전 측정단계;
상기 홈형성부(10)에 대하여 홈을 형성하는 단계;
상기 홈이 형성된 홈형성부(10)와 상기 표시부(20) 사이의 거리를 측정하여 홈형성 후 측정값을 획득하는 홈형성 후 측정단계;
상기 홈형성 전 측정값과 상기 홈형성 후 측정값을 상호 비교하여 변위를 계산하는 단계;
상기 변위로부터 상기 선정된 부재(1)의 잔류응력을 계산하는 단계;를
포함하는 것을 특징으로 하는 콘크리트 구조물의 잔류응력 측정방법.Selecting a member 1 in a state in which stress is generated by an external force in the concrete structure;
Displaying a groove forming portion (10) and a plurality of display portions (20) on one surface of the selected member (1);
A pre-groove measurement step of measuring a distance between the plurality of display units 20 to obtain a pre-groove measurement value;
Forming a groove in the groove forming unit (10);
A post groove forming step of measuring a distance between the groove forming unit 10 in which the groove is formed and the display unit 20 to obtain a measured value after forming the groove;
Calculating displacement by comparing the measured value before the groove formation and the measured value after the groove formation;
Calculating a residual stress of the selected member 1 from the displacement;
Residual stress measurement method of a concrete structure, characterized in that it comprises. 제1항에 있어서,
상기 홈형성부(10)는 하나이고, 상기 표시부(20)는 상기 홈형성부(10)를 중심으로 복수의 방향에 형성된 것을 특징으로 하는 콘크리트 구조물의 잔류응력 측정방법.The method of claim 1,
The groove forming unit (10) is one, the display unit 20 is a residual stress measuring method of the concrete structure, characterized in that formed in a plurality of directions around the groove forming unit (10). 제2항에 있어서,
상기 표시부(20)는 상기 홈형성부(10)를 중심으로 상하좌우의 4방향에 형성된 것을 특징으로 하는 콘크리트 구조물의 잔류응력 측정방법.The method of claim 2,
The display unit 20 is a residual stress measuring method of the concrete structure, characterized in that formed in four directions of the top, bottom, left and right around the groove forming portion (10). 제3항에 있어서,
상기 표시부(20)는 상기 홈형성부(10)를 중심으로 상하좌우 및 그 사이 영역을 포함하는 8방향에 형성된 것을 특징으로 하는 콘크리트 구조물의 잔류응력 측정방법.The method of claim 3,
The display unit 20 is a method for measuring the residual stress of the concrete structure, characterized in that formed in eight directions including the upper, lower, left, right and the area between the groove forming portion (10). 제2항 내지 제4항 중 어느 한 항에 있어서,
상기 표시부(20)는 상기 복수의 방향에 대하여 각각 복수가 형성된 것을 특징으로 하는 콘크리트 구조물의 잔류응력 측정방법.The method according to any one of claims 2 to 4,
The display unit 20 is a residual stress measuring method of the concrete structure, characterized in that a plurality is formed in each of the plurality of directions. 제1항에 있어서,
상기 홈형성 전 측정단계 및 홈형성 후 측정단계는 3D 광학 스캐너에 의해 수행되는 것을 특징으로 하는 콘크리트 구조물의 잔류응력 측정방법.The method of claim 1,
The measuring step before the groove formation and the measurement step after the groove formation is a residual stress measuring method of the concrete structure, characterized in that performed by a 3D optical scanner.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103017944A (en) * 2012-12-13 2013-04-03 江苏新扬子造船有限公司 Measuring method for longitudinal force of welding seam
KR102210418B1 (en) 2020-12-18 2021-02-02 한국건설기술연구원 System for predicting residual stress distribution of fire-damaged concrete structure, and method for the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103017944A (en) * 2012-12-13 2013-04-03 江苏新扬子造船有限公司 Measuring method for longitudinal force of welding seam
KR102210418B1 (en) 2020-12-18 2021-02-02 한국건설기술연구원 System for predicting residual stress distribution of fire-damaged concrete structure, and method for the same

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