• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2016년도 추계 학술논문 발표대회
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• pp.71-72
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• 2016

Most of studies on PC method aim at the structural analysis and development of PC members, and studies on the construction management aspect are insufficient. Therefore, this study tries to investigate 'hallow PC column composite method(HPC composite method)' from the viewpoint of construction management and analyze the construction cost of the composite method. On the assumption that each comparative method was applied to the zone, the difference in construction cost between the two methods was analyzed. As a result, HPC composite method increased the initial investment cost because of its factor technology, but reduced transport cost, lifting cost, and installation cost through lightweight columns. This study analyzed only the difference in construction cost of HPC composite method so that it has the limitation in evaluating its economy. Therefore, to evaluate the economy of HPC composite method, it is considered to research more the construction cost of HPC composite method.

• 한국지반공학회논문집
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• 제27권12호
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• pp.69-84
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• 2011

본 연구에서는 NATM Composite 라이닝 공법을 실제 터널 현장에 도입하기 위한 적용성 연구를 수행하였다. 먼저 고품질 PC 패널을 생산하기 위한 최적의 증기양생 조건을 도출하였으며 터널 화재 시 피해를 최소화하기 위해 화재모형 실험을 수행하여 PC 패널 라이닝의 화재 거동 특성을 고찰하였다. 또한 실제 현장에 시험시공을 수행하여 NATM Composite 라이닝 공법의 시공성과 안정성을 확인하였고, 현장 배수실험을 실시하여 경량기포 모르타르의 배수성능을 검토하였다. 그리고 추후 NATM Composite 라이닝 터널 설계 시 효율적으로 PC 패널 라이닝 수량을 산출 할 수 있도록 PC 패널 최적 조합 프로그램을 개발하였으며 공사비 분석 및 VE 평가를 통해 NATM Composite 라이닝 공법의 경제성을 검토하였다. 본 연구 결과 NATM Composite 라이닝 공법은 국내 터널 현장에 충분한 적용성을 갖는 것으로 판단된다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2016년도 춘계 학술논문 발표대회
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• pp.103-104
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• 2016

Most of studies on PC method aim at the structural analysis and development of PC members, and studies on the construction management aspect are insufficient. This study is a basic research in the construction management aspect regarding 'composite method using hollow-PC column' (HPC method), and is intended to develop assessment standards for the benefit·cost analysis of HPC method. Assessment standards for the benefit·cost analysis were composed of main-factors and sub-factors through interview with 4 experts. It was possible to classify main-factors into 4 major categories, i.e,. structural performance, construction performance, construction duration and construction cost. Sub-factors were composed of factors which were of high importance in assessing the two methods. And factors judged to be repeated or of little importance were excluded.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2014년도 추계 학술논문 발표대회
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• pp.92-93
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• 2014

Green Frame is a method for Rahmen structure construction composed of composite PC members. The composite PC members of Green Frame which are based on in-situ production can reduce the construction cost and are more likely to secure quality when compared to production in factories. Previous studies developed forms for in-situ production of Green Frame composite PC members and proposed algorithms to arrange them on site. However, it requires not only their arrangement, but also calculation of an accurate production period to produce the required PC members in a limited space and supply them in a timely manner. In particular, it is necessary to clearly define the properties of detailed processes for in-situ production of PC members and to calculate the time required for respective process. To do so, this study is a basic research on calculating the time for in-situ production using a linear scheduling method.

• 한국구조물진단유지관리공학회 논문집
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• 제13권2호통권54호
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• pp.199-205
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• 2009

하프PC 슬래브는 시공중에 슬래브 판에 균열이 발생하기 쉽고 이러한 균열들을 보수보강 하지 않은 상태에서 덧침콘크리트를 타설할 경우 합성슬래브의 내력에 영향을 미칠 것으로 사료된다. 하지만 하프PC 슬래브에 발생한 균열이 합성슬래브의 구조성능에 미치는 영향에 관한 연구는 아직까지 없는 실정이다. 따라서 본 연구에서는 하프PC 슬래브에 발생한 균열이 합성 슬래브의 내력에 미치는 영향을 조사하기 위하여 덧침 콘크리트를 타설하기 전에 하프PC 슬래브에 균열을 발생시킨 시험체와 균열이 없는 합성슬래브 시험체를 제작하여 슬래브의 휨 성능을 검토하였다.

• Composites Research
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• 제34권1호
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• pp.1-7
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• 2021

열가소성 섬유강화 복합재료는 수송용 기기의 경량화 소재로써 적용 분야가 확대되고 있다. 본 연구에서는 분자량이 다른 폴리카보네이트(PC)를 이용하여 연속섬유 강화 유리섬유(GF)/폴리카보네이트(PC) 복합소재의 함침성 및 기계적 물성에 대한 평가를 진행하였다. GF 직물과 PC 필름을 제조한 후, 이를 이용하여 연속가압성형법으로 연속섬유 강화 GF/PC 복합재 평판을 제조하였다. PC 분자량에 따른 용융지수를 측정 및 평가하였고, GF 제직물 강화 GF/PC 복합재료의 인장강도, 굴곡강도, 압축강도 및 기공체적률을 평가하였다. 전계방사형 주사전자현미경을 이용하여 인장파괴된 GF/PC 복합재료의 형태를 분석하여 파괴거동을 확인하였다. 분자량이 20,000일 때 최적의 기계적 특성이 발현되는 것을 확인하였다.

• 복합신소재구조학회 논문집
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• 제3권4호
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• pp.1-9
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• 2012

Dynamic application lower mode response is of interest, however the higher modes of spatially discretized equations generally do not represent the real behavior. Some implicit algorithms, therefore, are introduced to filter out the high-frequency modes. The objective of this study is to introduce the P-method and PC ${\alpha}$-method to compare that with dissipation method and Newmark method through the stability analysis and numerical example. PC ${\alpha}$-method gives more accuracy than other methods because it based on the ${\alpha}$-method inherits the superior properties of the implicit ${\alpha}$-method. In finite element analysis, the PC ${\alpha}$-method is more useful than other methods because it is the explicit scheme and it achieve the second order accuracy and numerical damping simultaneously.

• 한국지반공학회논문집
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• 제27권12호
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• pp.53-68
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• 2011

본 연구에서는 기존 NATM 터널공법의 문제점을 개선한 신개념의 NATM Composite 라이닝 공법 개발에 대한 기초 연구를 수행하였다. 먼저 NATM Composite 라이닝 공법의 개요 대하여 소개하고 시공성에 대한 검토를 수행하였다. 그리고 NATM Composite 라이닝 공법의 개발을 위한 기초 연구로서 고성능 PC 패널 라이닝의 개발을 위해 다양한 혼화재료의 영향을 검토하고, PC 패널 설치 위치별 최적 배합을 도출하였다. 또한 PC 패널 배면 뒤채움재로 경량기포 모르타르 재료를 개발하였으며 실대형 하중재하 실험을 통해 NATM Composite 라이닝 공법의 거동 특성을 규명하였다. NATM Composite 라이닝 공법은 기존 현장타설 라이닝 공법에 비해 안정성과 시공성을 크게 향상 시킬 수 있을 것으로 판단된다.

• Composites Research
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• 제29권5호
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• pp.269-275
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• 2016

Multiscale hybrid composites, which consist of polymeric resins, microscale fibers and nanoscale reinforcements, have drawn significant attention in the field of advanced, high-performance materials. Despite their advantages, multiscale hybrid composites show challenges associated with nanomaterial dispersion, viscosity, interfacial bonding and load transfer, and orientation control. In this paper, carbon nanotube(CNT)/carbon fiber(CF)/polycarbonate(PC) multiscale hybrid composite were fabricated by a solution process to overcome the difficulties associated with controlling the melt viscosity of thermoplastic resins. The dependence of CNT loading was studied by varying the method to add CNTs, i.e., impregnation of CF with CNT/PC/solvent solution and impregnation of CNT-coated CF with PC/solvent solution. In addition, hybrid composites were fabricated through surfactant-aided CNT dispersion followed by vacuum filtration. The morphologies of the surfaces of hybrid composites, as analyzed by scanning electron microscopy, revealed the quality of PC impregnation depends on the processing method. Dynamic mechanical analysis was performed to evaluate their mechanical performance. It was analyzed that if the position of the value of tan ${\delta}$ is closer to the ideal line, the adhesion between polymer and carbon fiber is stronger. The effect of mechanical interlocking has a great influence on the dynamic mechanical properties of the composites with CNT-coated CF, which indicates that coating CF with CNTs is a suitable method to fabricate CNT/CF/PC hybrid composites.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1998년도 가을 학술발표논문집(II)
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• pp.513-518
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• 1998

In Half Precast Concrete Method, such as composite slab and composite wall, Interface between half PC plate and cast-in-place concrete is occurred. And this interface endure lastly in-plane shear which is occurred by external force. Therefore, test was executed to study in-plane shear strength of interface between half PC plate and cast-in-place concrete. In this test, Experimental parameters are finishing condition of the interface, cohesion of concrete, existence and nonexistence of re-bar truss, and angle and direction of lattice of re-bar truss. Comparing and analyzing experimental results, conclusions are obtained as follows. (1) In-plane shear strength of wide interface in composite plate is more affected by the roughness of interface than re-bar truss. And cohesion of concrete contribute to increasing in-plane shear strength. Therefore it seems that the interface should be roughen and kept clean to improve in-plane shear strength. (2) It seems that shear friction equation in ACI code can be sagely available for design of in-plane shear of composite plate.