• 국제강구조저널
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• 제18권5호
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• pp.1761-1771
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• 2018

In this paper, a hysteretic model of rectangular hollow section (RHS) columns that includes the deteriorating range caused by local buckling is proposed. The proposed model consists of the skeleton curve, the Bauschinger part that appears before reaching the maximum strength, the strength increasing part of the deteriorating range, and the unloading part. Of these, the skeleton curve, including the deterioration range caused by local buckling, which is considered to be equivalent to the load-deformation relationship under monotonic loading, is obtained through an analytical method. Bi-linear hysteretic models based on experimental results are applied to the Bauschinger part and the strength increasing part. The elastic stiffness is applied to the unloading part. The proposed model is verified by comparing with experimental results of RHS columns under monotonic and cyclic loading.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2020년도 가을 학술논문 발표대회
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• pp.192-193
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• 2020

In reinforced concrete adhesion studies, the demolition of the specimen is inevitably involved, and the studies conducted are limited to the macro load-displacement analysis. In order to establish an elaborate model for concrete bonding reinforced rebars, it is necessary to observe the rebar bonding behavior in the in-situ state. In this study, specially manufactured reinforcing bars, micro-UTM and 𝝁-computer tomography (𝝁CT) are used to observe reinforcing bars in the in-situ state. As a result of the monotonic pullout test of the processed reinforcing bar, maximum bond stress were shown to be 16.7MPa, which is slightly higher than the existing 10 to 12 MPa, and then the empty space inside the specimen in which the pullout test was conducted using 𝝁CT was confirmed. Through additional research, the fracture phenomenon of concrete excluding voids will be studied.

• 대한조선학회논문집
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• 제28권1호
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• pp.108-116
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• 1991

선용재료중(船用材料中)에는 정적하중(靜的荷重)에 의한 정적거동(靜的擧動)(응력-변형률관계)과 반복하중(反復荷重)에 의한 반복거동(反復擧動)(응력진폭-변형률진폭관계)이 상이(相異)하게 되는 경우가 많다. 특히 탄소성(彈塑性) 응력집중부(應力集中部)에서 진전(進展)하는 초기의 짧은 피로균열(疲勞龜裂)은 재료(材料)의 반복거동(反復擧動)에 크게 의존하여 성장하므로 재료(材料)의 정적(靜的) 및 반복거동(反復擧動)의 비교, 검토가 요구된다. 본 연구에서는 2종류의 철강재료(鐵鋼材料)(SS41, HT80)와 5종류의 Al합금(合金)(A5083-O, A6N01-T5, A7N01-T4, A7016-T6, A7178-T6)에 대하여 정적(靜的) 및 반복하중(反復荷重)에 의한 재료(材料)의 응력-변형율(應力-變形率) 관계(關係)를 비교, 검토하였고, 각(各) 재료상수(材料常數)를 구하였다. 또한 응력집중부(應力集中部)에 일정 진폭의 반복하중(反復荷重)이 작용(作用)하여 탄소성(彈塑性) 변형(變形)할 때 그 선단(先端)의 응력(應力)과 변형률(變形率) 진폭(振幅)의 변화(變化)에 미치는 재료(材料)의 반복(反復) 경화특성(硬化特性)의 영향에 대하여 Neuber법칙(法則)과 중앙(中央)노치재(材의) 실험(實驗)에 의하여 고찰(考察을 행하였다.

• 한국구조물진단유지관리공학회 논문집
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• 제25권6호
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• pp.226-234
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• 2021

이 연구의 목적은 천장구조재의 내진성능향상을 위해 개발된 제진장치(seismic damping·isolation unit, 이하 SDI 유닛)의 압축 및 인장하중상태의 하중-변위 관계를 평가하고 축하중 설계를 위한 기초자료를 구축하는데에 있다. 주요변수는 스프링의 유무, 방진고무의 적층수와 스프링과 방진고무의 결합을 위해 설치된 볼트의 프리스트레스력의 크기 그리고 재하방법이다. 실험결과 볼트의 프리스트레스력의 크기가 클수록, 반복하중 보다는 단조하중에서, 그리고 스프링이 있는 SDI 유닛은 하중-변위관계에서 탄성한계점까지의 강성증가 뿐만 아니라 최대 하중 이후의 연성거동에 유리하였다. 결과적으로 에너지 소산능력은 스프링이 있으면서, 3층의 방진고무 및 볼트 항복강도의 10%의 프리스트레스력을 갖는 SDI 유닛에서 가장 높았다. 개발된 SDI 유닛의 인장내력에 대해 JIS B 2704-1(2018) 및 KDS 31 00(2019)의 기준은 단조상태에서는 안전측에서 평가된 반면, 반복하중상태에서 약 10% 높게 평가되었다.

• 한국강구조학회 논문집
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• 제24권6호
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• pp.647-657
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• 2012

원자력 배관 시스템은 엄격한 설계기준에 따라 제작 되었음에도 불구하고, 장기 사용에 따라 발생하는 감육 및 균열에 의한 파손 사례가 보고되고 있다. 이에 본 연구에서는 스테인리스강 배관 시험체의 단조하중 및 반복하중 재하실험을 실시하여 국부 감육과 균열의 손상유무 및 0%, 35%, 75%의 손상정도가 배관의 파괴거동에 미치는 영향을 실험적으로 검토하였다. 본 실험에서는 실제 원자력 발전소에서 사용되고 있는 직경 3인치 TP316 스테인리스강 엘보우와 직관 배관을 대상으로 하여, 인위적으로 곡관부와 용접부에 0%, 35%, 75%의 국부적인 감육과 균열을 도입하고 20MPa의 내압을 가한 후 재하실험을 실시하였다. 그 결과, 국부 감육 및 균열의 손상정도가 파괴모드, 최대하중, 반복회수 및 에너지흡수율에 미치는 영향을 정량적으로 평가하였다. 그리고 휨 모멘트를 이용하여 ASME의 결함 허용기준을 평가하였다.

• Computers and Concrete
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• 제32권4호
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• pp.351-363
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• 2023

Reducing the self-weight of reinforced concrete structures problem is discussed in this paper by using two types of self-weight reduction, the first is by using lightweight coarse aggregate (crushed brick) and the second is by using styropor block. Experimental and Numerical studies are conducted on (LWAC) lightweight aggregate reinforced concrete slabs, having styropor blocks with various sizes of blocks and the ratio of shear span to the effective depth (a/d). The experimental part included testing eleven lightweight concrete one-way simply supported slabs, comprising three as reference slabs (solid slabs) and eight as styropor block slabs (SBS) with a total reduction in cross-sectional area of (43.3% and 49.7%) were considered. The holes were formed by placing styropor at the ineffective concrete zones in resisting the tensile stresses. The length, width, and thickness of specimen dimensions were 1.1 m, 0.6 m, and 0.12 m respectively, except one specimen had a depth of 85 mm (which has a cross-sectional area equal to styropor block slab with a weight reduction of 49.7%). Two shear spans to effective depth ratios (a/d) of (3.125) for load case (A) and (a/d) of (2) for load case (B), (two-line monotonic loads) are considered. The test results showed under loading cases A and B (using minimum shear reinforcement and the reduction in cross-sectional area of styropor block slab by 29.1%) caused an increase in strength capacity by 60.4% and 54.6 % compared to the lightweight reference slab. Also, the best percentage of reduction in cross-sectional area is found to be 49.7%. Numerically, the computer program named (ANSYS) was used to study the behavior of these reinforced concrete slabs by using the finite element method. The results show acceptable agreement with the experimental test results. The average difference between experimental and numerical results is found to be (11.06%) in ultimate strength and (5.33%) in ultimate deflection.

• 한국강구조학회 논문집
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• 제16권2호통권69호
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• pp.267-274
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• 2004

본 실험의 목적은 H형강보에 작용하는 매달림 하중 중 연직하중인 인장하중을 그 대상으로 구조설계시 적용되는 설계하중에 대하여 인장하중이 스터드 커넥터를 통하여 슬래브에 전달되는 하중전달 경로와 그 성능을 파악하는데 있다. 이를 위하여 스터드 커넥터의 기초실험을 실시하고 2개의 실대형 시험체를 제작하여 인장하중에 대한 전달성능을 파악하였다. 실험의 변수로는 H형강보의 크기가 적용되었다. 인장하중 가력실험결과 현행 강구조계산기준을 따라 설계하면 스터드 커넥터에 의한 H형강보의 인장하중의 전달성능은 설계하중을 만족하고 있음을 확인하였다.

• 복합신소재구조학회 논문집
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• 제4권1호
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• pp.33-39
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• 2013

Structural insulated panels, structurally performed panels consisting of a plastic insulation bonded between two structural panel facings, are one of emerging products with a viewpoint of its energy and construction efficiencies. These components are applicable to fabricated wood structures. In Korea, there are few technical documents regulated structural performance and engineering criteria in domestic market. This study was conducted to identify fundamental performance of both monotonic load and quasi static cyclic load for SIPs in shear wall application. Static test results showed that maximum load was 44.3kN, allowable shear load was 6.1kN/m, shear stiffness was 1.23 M N/m, and ductility ratio was 3.6. Cyclic test was conducted by two kinds of specimens : single panel and double panels. Cyclic test results, which were equivalent to static test results, showed that maximum load was 45.42kN, allowable shear load was 6.3kN/m. Furthermore the accumulated energy dissipation capability for double panels was as 2.3 times as that for single panel. From performance of structural tests, it was recommended that the allowable shear load for panels was at least 6.1kN/m.

• Computers and Concrete
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• 제19권5호
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• pp.567-577
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• 2017

This study presents investigation of the behavior of moderately thick reinforced concrete slabs having hollow cores with different parameters. The experimental part of this investigation includes testing eight specimens of solid and hollow-core slab models having (2.05 m) length, (0.6 m) width and (25 cm) thickness under two monotonic line loads. Load versus deflection was recorded during test at mid span and under load. Numerically, the finite element method is used to study the behavior of these reinforced concrete slabs by using ANSYS computer program. The specimens of slab models are modeled by using (SOLID65) element to represent concrete slabs and (LINK180) element to represent the steel bars as discrete axial members between concrete nodes. The finite element analysis has showed good agreement with the experimental results with difference of (4.71%-8.68%) in ultimate loads. A parametric study have been carried out by using ANSYS program to investigate the effects of concrete compressive strength, size and shape of core, type of applied load and effect of removing top steel reinforcement.

• 열처리공학회지
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• 제2권4호
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• pp.19-26
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• 1989

Fundmental fatigue crack propagation tests with C-T type specimens were conducted at various load ratios (R) such as 0.1, 0.3 and 0.5 in T6 and Thermomechanically treated (TMT) conditions of 7039 Al alloy. Better mechanical properties from monotonic test as well as fatigue crack propagation were obtained by TMT process owing to uniform distribution of fine microstructures and non-existence of precipitation free zone (PFZ). Through the measurement of Kop and ${\Delta}K$ at various R the concept of effective stress intensity factor range ratio, U was reviewed to asses the load ratio effect on fatigue crack propagation. A relationship between U and variables such as ${\Delta}K$ and R was obtained empirically. This may enable us to predict ${\Delta}K_{eff}$ that is of critical importance for prediction of fatigue crack propagation rate.