후크형강섬유 혼입량에 따른 구조용 데크플레이트 슬래브의 실용화 방안

신정은 호서대학교 대학원 2015 국내석사

최근 건축물이 고층화 되면서 고층건물의 안전성과 시공성을 만족시키기 위한 방법으로 데크플레이트를 이용한 바닥슬래브 구조가 사용되고 있다. 구조용 데크플레이트는 철근콘크리트 바닥슬래브와 달리 거푸집과 동바리를 따로 설치할 필요가 없어 공기 단축이 가능하며, 데크플레이트 자체가 인장철근의 역할을 수행할 수 있다. 또한 강섬유콘크리트는 강섬유를 콘크리트에 혼입함으로써 내마모성, 연성, 인성, 내충격성 등을 높인 콘크리트를 말하며 콘크리트의 취성파괴를 감소시키며 연성능력을 증가시킬 수 있다. 이러한 구조용 데크플레이트와 강섬유콘크리트의 사용은 공사의 노무비 절감과 공기단축에서 오는 공사비 절감을 통한 경제적인 효율성을 기대 할 수 있다. 따라서 본 연구에서는 구조용 데크플레이트와 후크형강섬유 혼입량을 변수로 설정하여 구조용 데크플레이트 슬래브의 구조성능과 사용성, 경제성을 평가하였다.

강섬유보강콘크리트의 휨강도 산정식 제안

길근영 호서대학교 대학원 2023 국내석사

The proposal of the flexural tensile strength formula combines the material test results of steel fiber reinforced concrete conducted by existing researchers at domestic and foreign and the material test results conducted in this study, analyzes the relationship between compressive strength, flexural tensile strength, and the mixing ratio of steel fiber, and An expression for the flexural tensile strength of reinforced concrete was proposed. The proposed formula was theoretically evaluated by applying the mixing ratio of 0.5% obtained through material tests to the formula for drying shrinkage that occurs in concrete.

후크형강섬유 혼입량에 따른 구조용 데크플레이트 슬래브의 실용화 방안 연구

신정은 호서대학교 2015 국내석사

구속효과를 고려한 고강도 원형 CFT 기둥의 내력평가에 관한 연구

조원대 호서대학교 2015 국내석사

In present, many countries' design specifications evaluate the strength of Concrete Filled Tube (CFT) with sumple summating estimation and concrete core's confining effect from external steel casing is neglected or expressed ambiguously. In this study, the confining effect is evaluated by performing axial compression test for circular single post CFT with high strength steel. Variables are width-thickness ratio of specimen, yield strenght of steel and compression strenght of concrete. Result shows that confining effect of circular CFT for each specification is evaluated very conservatively and, for CFT with high strength steel, significant confining effect is shown even with increased width-thickness ratio. Therefore, for the efficient design of members, additional research for the confining effect of high strength steel is required.

후크형 강섬유를 혼입한 데크플레이트 슬래브의 사용성 및 구조적 성능 평가

황승구 호서대학교 2017 국내석사

Reinforced concrete has advantages in that it is excellent in durability, easy to supply as a generalized material, and low unit price. However, since the reinforced concrete structure has a comparatively long construction period, it has a disadvantage of causing an increase in the construction cost of several items including labor costs. In the case of a reinforced concrete building, the area occupied by the slab is greatly large, but the size of the load borne by the structural member is relatively small, rather the problem is known as a crack aspect of Usability. Therefore, for reducing construction process duration which directly affect construction period such as slab form-work and reinforcing bar, this study will try to develop a composite slab incorporating the structural deck plate and the hook-ended steel fiber. In this paper, we evaluated the usability and structural performance of reinforced concrete slab as control group and deck-plate slab reinforced steel-fiber as experimental group. Experimental results showed that deflection and crack of experimental group in long-term behavior and dry-shrinkage cracks in curing at early age appeared to be superior, and even experiments on structural performance had better bending strength and rigidity than the control group. These performances are considered that there is a correlation with the difference in section property such as tensile force and moment of inertia of the experimental group. However, for comprehensive analysis, the unit cost of hook-ended steel fiber and structural deck-plate is higher than of rebar, so correction of indicators such as economic feasibility should be considered.

강섬유보강콘크리트의 휨인장강도 평가

강민혁 호서대학교 일반대학원 2023 국내석사

Domestic building structural standards do not provide a calculation formula for the flexural tensile strength of steel fiber reinforced concrete. In this study, we analyzed the material test data of steel fiber reinforced concrete conducted by domestic and foreign research materials, and took into account the compressive strength of concrete, flexural tensile strength, and volume ratio of steel fibers, which affect the flexural tensile strength, to determine the flexural tensile strength of steel fiber reinforced concrete. A strength evaluation equation was presented.

벽식 아파트의 리모델링 구조설계

박아름 호서대학교 대학원 2005 국내석사

Recently, remodeling of the reinforce concrete apartment became hot issue of the housing policy in Korea. In Korea, the seismic design regulation has been established since 1988 in order minimize the economic losses. The main structure modeling executed seismic performance to apartment since remodeling about existing apartment of the 1980's. When seismic performance, analyzed lateral displacement change of modeling according to application availability of Effective Beam Width Method. As a result, lateral displacment of existing apartment did not satisfy internal examination standard regardless of application of Effective Beam Width Method, but lateral displacement that treat since remodeling satisfied internal examination standard. Also, lateral displacement of remodeling analysis that apply Effective Beam Width Method was analyzed in more safe side.

판폭두께비를 고려한 고강도 각형 CFT의 구조성능 평가

조민수 호서대학교 일반대학원 2014 국내석사

최근 인구의 도시집중과 새로운 형태의 건축물에 대한 사회적 필요성이 증가하면서 건축물의 초고층화, 대형화가 요구되고 있다. 이러한 현상은 구조부재의 높은 축력 및 높은 횡력에 저항할 수 있는 우수한 내력 및 강성을 요구하게 되어 강성, 내력, 변형능력 면에서 우수한 성능을 가진 CFT에 대한 관심도 높아지고 있다. 건축물의 초고층화 및 대형화는 필연적으로 수직 및 수평하중이 증가하게 되고, 이는 부재단면과 부재 사용량의 증가를 유발하여 궁극적으로 건축물 유효공간의 확보가 불리해진다. 이러한 이유로 고강도 재료의 개발과 적용이 활발히 진행되고 있으며, 국외 기준들도 점차 재료강도제한을 완화하는 추세에 있다. 이와 함께 국내에서도 고강도 재료에 대한 강도제한 규정의 완화가 필요하다고 판단되며 이와 함께 합성부재에 대한 판폭두께비 제한규정에 대한 검토의 필요성이 있다고 판단된다. 이에 따라 본 연구에서는 현행설계기준 KBC 2009에 제시된 제한사항에 따라 강재와 콘크리트에 대한 설계강도를 산정하고 각 재료에 대한 응력분석과 경제성 평가를 실시하여 재료의 최적 효율성 및 최적 강도조합을 분석하도록 하였다. 또한, 기존의 연구자료 분석과 성능평가 실험을 통하여 CFT에 대한 고강도 강재의 적용성과 고강도 강재에 대한 판폭두께비 분석 및 검토를 하였다.

코너강판벽을 활용한 개량형 자동인양 거푸집 시스템 최적 설계

심우경 호서대학교 대학원 2021 국내석사

In this study, an analytical study was conducted on the optimum structural design of modified auto climbing formwork system that utilizes the steel plates at both ends of the core as a support point in connection with the corner steel composite core wall structural system. Accordingly, data of optimal design of system components are accumulated through variable studies on the geometrical parameters such as the span and height of the formwork system and the spacing of the horizontal members and form-ties. And weight analysis of the total formwork frame was conducted for increasing the construction ability and reducing the lifting capacity and loads acting on anchor bolts. As a results, the resistance to lateral concrete pressure during pouring of concrete can be controlled by form-tie that connects the both-sided formwork, and the span of the formwork or the cross-section of the horizontal member not significantly affect the design of the constituent member. And, the equations for expecting the maximum displacement of formwork and the maximum stress of the form-tie were proposed for designing formwork in various conditions.

용접 이형 철선을 사용한 슬래브의 휨성능 및 사용성 평가

정승원 호서대학교 대학원 2022 국내석사

The modern construction market is in various difficult conditions such as a lack of professional construction personnel, an increase in labor and material costs, and environmental regulations. As a result, there are serious problems such as an increase in construction costs and a relative decrease in productivity, and many problems such as occurrence of safety accidents and poor reinforcement construction have been reported during field work. As a solution, it is emerging as an efficient way to reduce labor costs and shorten air by using a structural welding wire mesh (WF) that minimizes field work, has a constant rebar spacing, and simplifies the on-site reinforcement process. In addition, in Korea, a series of studies have been conducted on "rebar pre-assembly methods with structural welding nets" in this context to ensure precise assembly based on accurate background construction and standardized processing. The structural welding wire mesh is a type of pre-assembly steel bar manufactured by electrical resistance welding the intersection point by arranging horizontal and vertical wires at right angles, and is manufactured using cold and surface-processed steel wires. Through this process, it is reported that the structural welding wire has high yield strength, but the elongation compared to the release reinforcement is lowered, which can lead to a decrease in the elongation of the member. In addition, while the yield section is not clear due to the characteristics of the iron wire itself and the adhesion stress is lowered due to the shape characteristics, strain localization may occur due to high acupressure characteristics due to the iron wire welded in the orthogonal direction. Research cases have also been confirmed that this characteristic leads to brittle destruction mode of the member due to fracture of the tensile steel wire. This research aims to determine the characteristics of materials and the adhesion performance between release steel wire and concrete using a welding wire to verify the problem and solve the problem, and to verify the structural performance when applied to structural members.