• Korean Journal of Construction Engineering and Management
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• v.19 no.6
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• pp.3-13
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• 2018

The formwork cost amounts for a significant proportion of project construction costs. It costs 10-15% of the total construction cost and 30-40% of the frame structure construction cost. In addition, the formwork collapse accidents are frequently causing deaths in the construction industry, and thus, is known to be of relatively high degree of risk. As so, the accuracy of structural calculation and quantity take-off when planning the formwork in a construction project are a very important matter. Accordingly, this study develops a BIM based formwork design prototype, that enables the construction manager to optimize the design through applying the proposed new IFC entities associated with the formwork design. The approach proposed in this study is expected to support the construction manager with accurate quantity calculation and rapid planning and construction. Since this study considered specific small-scale buildings using Euro-form and show the possibility of utilizing BIM entities in the formwork design process, further research is recommended towards the limitations in applying the system to other types of formworks.

• Steel and Composite Structures
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• v.21 no.5
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• pp.1105-1119
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• 2016

In this study, it is presented that a new developed approach for equivalent area-distributed loading (EADL) induced from a single concentrated force. For the purpose, a full scale 3D steel formwork system was constructed in laboratory conditions. A developed load transmission platform was put on the formwork system and loaded step by step on the mass center. After each load increment, displacement was measured in several crictical points of the system. The developed platform which was put in to slab of formwork to equivalently distribute the load from a point to the whole slab was constituted using I profiles. A 3D finite element model of the formwork system was analyzed to compare numerical displacement results with experimental ones. In experimental tests,difference among the displacements obtained from reference numerical model (model applied EADL) and main numerical model (model applied single load using a load cell via load transmission platform) is about %13 in avarage. Difference among the displacements obtained from experimental results and main numerical model under 30 kN single load is about %11 in avarage. The results revealed that the displacements obtained experimentally and numerically are dramatically closed to each other. It is highlighted from the study that the developed approach is reliable and useful to get EDL.

• Journal of the Korean Society of Safety
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• v.19 no.2
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• pp.93-97
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• 2004

Slab formwork consists of sheathing, stringer, hanger and shore. There are several types of adjustable individual shores. In constructions site, pipe supports are usually used as shores. The strength of a pipe support is decreasing as it is frequently being used at the construction site. In this study, 2857 pipe supports were bought to fine out the strength change of used pipe support and unused pipe supports according to aging. Among these pipe supports, 2337 pipe supports were lent to the construction companies free of charge. Compressive strength was measured by knife edge test and plate test at each 3 month. Test results show that the strength of unused pipe supports almost equaled to the strength of new pipe supports until 191 days, but the strength of used pipe supports at 191 days was lower than the strength of new pipe supports. So, the strength of used pipe supports at 191 days was not satisfied the specification of KS F 8001. According to these results, it shows that attention has to be paid to formwork design using used pipe supports. Therefore, the paresent study results will be able to provide a firm base to design slab formwork and test the performance of used temporary structure and prevent formwork collapses.

• Journal of the Korean Society of Safety
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• v.23 no.4
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• pp.67-71
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• 2008

Formwork is a temporary structure that supports its weight and that of fresh concrete as well as construction live loads. Slab formwork consists of sheathing, stringer, hanger and shore. In construction site, pipe supports are usually used as shores which are consisted of the slab formwork. In this study, compressive strength of 80 pipe supports was measured by knife edge test and plate test. Buckling load of pipe supports was analyzed by structural analysis program(MlDAS). Theoretical buckling load with/without initial deformation was got by theoretical analysis. According to these results, buckling load which was analyzed by structural analysis program(MlDAS) was larger than compressive strength of knife edge test and plate test. Theoretical buckling load without initial deformation was larger than compressive strength of knife edge test and plate test. But Theoretical buckling load with initial deformation was lower than compressive strength of knife edge test and plate test. Initial deformation equation for test method according to the pipe support length was suggested. Therefore, the present study results will be used to design the slab formwork safely.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2020.06a
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• pp.153-154
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• 2020

The purpose of this paper is to examine the characteristics of heat and hydration of concrete according to formwork materials. As a result of the experiment, it was found that there were no problems such as concrete heat loss and delay in hydration reaction due to the use of synthetic resin formwork.

• Proceedings of the Korea Concrete Institute Conference
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• 2006.05a
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• pp.622-625
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• 2006

This Study is the consideration for new formwork assembly method in Bearing Wall System. It is consisted of two parts. one is researched into an ordinary formwork system and suggested a new formwork system. The other makes an investigation into the resisting capacity of proposed method by experimental and field test. For the application of this method to the field, it is expected to improve workability and safety, and to reduce the loss of labor.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2017.05a
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• pp.54-55
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• 2017

Recently, plastic panels have replaced plywood panels in formwork. Since, plastic panels have excellent workability, can be re-used for over 50 times, and are lighter than Plywood. This paper aims to perform an economic analysis of plastic panels by considering unit cost, cost of form oil and the number of use. The results showed that plastic panels are more economical than plywood according to an increase in area of construction site. This result of the study can be used as a basic data for the selection of plastic formwork panels.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2019.05a
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• pp.8-9
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• 2019

Euro forms and aluminum forms, which are currently used in formwork construction sites are limited by their heavy weight and the use of environmentally hazardous form oils. Therefore, in this study, 'eco-friendly light weight form' was developed, which does not require form oils during the removal process of form. In addition, the superiority of the developed form was verified by comparison with Euro forms and aluminum forms in terms of noise generation and weight. Application of the eco-friendly light weight form in construction sites is expected to reduce the noise level, and increase workers' convenience. The productivity of formwork is also increased.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2019.11a
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• pp.130-131
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• 2019

As part of recent low-energy policies, thermal insulation standards for buildings are being tightened every year. In addition, the conventional styrofoam insulating material has a problem that the thickness of the heat insulating material to achieve a standard heat permeability is rapidly increased. Due to the thick insulation, there is a high risk of spreading vulnerable structures such as fire due to lack of space between buildings. On the other hand, the method of using the insulation as a formwork is known to be excellent cost saving effect through the reduction of the formwork usage and the simplification of the external insulation work. In order to solve this problem, this study aims to fabricate a multi-layered insulator that combines high-performance phenolic foam insulation and styrofoam insulation and evaluate the deflection characteristics for use as formwork.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2019.11a
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• pp.112-113
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• 2019

In this study, development of 3D software for automated formwork design was conducted to achieve optimization and reduction of labor for temporary work. Through the literature review, the current technical level was identified and the required functions of 3D software for automated formwork design were derived. The 3D software should be developed with the aim of automating 3D design, improving construction quality and utilizing the Internet of Things. As a preliminary step to develop 3D software, the prototype demo version was developed to implement 3D design automation function, which confirm the possibility of 3D software development.