Recently, the number of cases of fire spreading due to exterior materials of buildings is increasing. Due to the nature of modern architecture, which emphasizes the aesthetics of buildings, because buildings pursue a splendid appearance, they are inexpensive and have relatively good insulation performance, but an increasing number of buildings are adopting insulation materials that have poor fire safety performance. The risk of spread is also greatly increased. Since the exterior wall of a building is made of a variety of materials and structures, it is composed of a combination of several elements, including materials such as insulation and finishing materials. Therefore, it was determined that it was necessary to introduce a more systematic evaluation method for building exterior materials, and to improve the system reflecting this, away from the existing evaluation method that only checked the fire safety performance of finishing materials.

Plastic waste is becoming a problem in various countries because of the difficulty of natural decomposition. One type is PET plastic(Polyethylene Terephthalate), which is often used as a bottle for soft drink packaging, and LDPE(Low Density Polyethylene), which is also widely used as a food or beverage packaging material. The use of these two types of plastic continuously, without good recycling, will have a negative impact on the environment. Building material waste is also becoming a serious environmental problem. This study aims to provide a solution to the problem of the above plastic waste and building material waste by making them into a mixture to be used as bricks. Research is carried out by mixing both materials, namely plastic heated at a temperature of 180-220oC and building material waste that had been crushed and sized to 30-40 mesh with homogeneous stirring. The ratios of PET and LDPE plastic to building material waste are 9 : 1, 8 : 2, 7 : 3, 6 : 4 and 5 : 5. After heating and printing, density, water absorption and compressive strength tests are carried out. Addition of PET and LDPE plastic can increase compressive strength, and reduce water absorption, porosity and density. A maximum compressive strength of 10.5 MPa is obtained at the ratio of 6 : 4.

This study aims to provide preliminary review for standardization of methods for evaluating reduction performance of pollution-reducing building materials and to select commercially available pollution-reducing building materials for assessing their current status. The ISO 16000-23 and -24 standards were used as references for standardizing the test methods. The sub test categories—stability of the supply air concentration, type of the supply air, and supply air concentration—which were not included in the standards were selected and conducted for the purpose of this study. Five (5) wall materials and 2 ceiling materials were tested for formaldehyde reduction performance and 3 wall materials were tested for toluene reduction performance. The study included experimental review of the essential test criteria such as stability of the supply air, internal stability of the chamber, and recovery rate. The samples tested exhibited some reduction performance for formaldehyde but little reduction performance for toluene.

대형구조물 설계 건설시 가장 큰 제한 조건은 모든 건설재료에는 치수의 한계가 있다. 따라서 본 논문 에서는 고전 보 이론에 의하여 단순 지지된 비등방성 슬래브의 처짐값을 구한 후 그 값을 비교 하였고, 특별 직교이방성 판 이론에 의하여 콘크리트와 샌드위치 교량의 물성을 비교하여 그 결과에 따른 처짐비와 강성값을 비교하였다. 경계조건은 임의의 경계조건을 갖는 판에 대한 해석해가 없기 때문에 부득이하게 네변이 모두 단순지지 되었을 경 우로 해석을 하였고 복합재료의 인장강도는 콘크리트나 강재보다 훨씬 높으므로 비교대상은 처짐으로 하였다. 즉, 철근 콘크리트와 동일하거나 작은 처짐을 일으키는 몇 가지 샌드위치판을 선택하여 고려하였다.

Mold infestation problems in building are a complex phenomenon due to various causes such as environmental conditions including temperature and relative humidity, substrates (building materials), exposure time, and so on. Earlier studies showed the interrelationship among humidity, temperature conditions and mold growth. However, surface structure also can be a key factor to mold germination. This study conducted experiments on the mold germination and growth on wallpapers with different surface structures. Four wallpapers and two fungal species (Aspergillus versicolor, Penicillium chrysogenum) were selected for experiment and observed fungal germination and growth on the different surface structures of wallpapers using scanning electron microscope. The resulfts showed that the shape of the micro structure of wallpaper surface affected to the growth of fungi.

본 논문에서는 패시브 진돈제어시스템을 설치한 실대물 K형 철골브레이스 골조의 실험결과를 다루었다. 패시브 진동제어시스템은 점탄성물질을 이용하여 새롭게 개발된 댐퍼를 사용하였다. 이 실험모델의 진동제어 효율성을 확인하고 철골조 브레이싱의 진동반응특성을 조사하기 위하여 일련의 실험을 행하였다. 자유진동실험결과 댐퍼를 설치시 설치하지 않은 경우와 비교하여 3배정도의 진동제어능력을 나타냈다. 점탄성물질 난류댐퍼의 효율성은 진동실험에 의하여 확인되었다.

This thesis investigates vibration response characteristics of building frames in which dampers are installed. The frames belong to passively vibration-controlled. Structures which utilizes energy dissipation of mechanical dampers provided in the structure. In this thesis, a turbulent flow damper sealed by visco-elastic material was dealt with as the device of passive vibration control. To investigate the resisting force characteristics of the damper, harmonic vibratration tests were carried out. Based on the test results, a theoretical model of the damper resistance was presented and a method of identifying the model parameters was proposed. Shaking table tests of the frame with and without the dampers were carried out and the effectiveness of the damper was examined. The response of the frame with the dampers was reduced to 1/2 or 1/3 of the cases without the damper.

In the Chosun Dynasty, the wooden building materials for constructing the official buildings within a capital city were supplied by way of water transport, and they were stored at Hangang riverbanks. After being firstly treated with primary processed-goods there by several craftmen groups, they were carried in the relevant site of construction by cart. The purpose of this paper is to study the process of those supply, the roles of merchants and craftmen in the process.