간행물
복합신소재구조학회 논문집 KCI 등재 Journal of the Korean Society for Advanced Composite Structures
- 발행기관 한국복합신소재구조학회
- 자료유형 학술지
- 간기 격월간
- ISSN 2093-5145 (Print)2288-0232 (Online)
- 수록기간 2010 ~ 2024
- 주제분류 공학 > 토목공학 공학 분류의 다른 간행물
- 십진분류KDC 532DDC 624
권호리스트/논문검색
Vol. 8 No. 2 (2017년 6월) 9건
1.
2017.06
구독 인증기관 무료, 개인회원 유료
Modified dapped end, precast prestressed double-tee slabs were considered in this research. It can facilitate insertion of service ducts at the dapped ends. The total depth of the floor slab may be reduced. In addition, the underside of the double-tee slab showed simpler appearance. Static three-point shear loading test was performed on full-scale specimens. And three modified single-tee slabs were analyzed by strut-tie model method. The specimen failed during the test in the same location as predicted by the strut-tie analytical model. The analysis of experimental results in comparison to the analysis results revealed that the experimental failure loads manifested 108% of analytical failure loads on the average.
4,000원
2.
2017.06
구독 인증기관 무료, 개인회원 유료
Cyclic loading test was performed on the partially infilled reinforced concrete(RC) frames by L-type precast concrete(PC) wall panels with the connections of two different strength. Based on the results of experimental test, the nonlinear analysis was practiced with modified strut-tie model(STM) method by using a computer program. Truss member of modified STM was designed, applying the strut-tie model theory of ACI 318M-11 Appendix-A. Modified STM was designed with two ways according to the test result. PC wall panel and RC frame were assumed to composite when push loading applied. The PC and RC structures were also assumed to behave non-composite and those two structures connected with link(top connector) when pull loading applied. The connection was designed by using elastic link of program. The results of analytical modified STM process generally conform to the experimental results. The failure load and the failure mode of the specimens could be predicted using modified STM. The ratio of failure load measured in specimens to analytical values were between 0.83∼1.16. The member or connection which was failed in experiment yield in the results of modified STM. The failure mode perfectly matched.
4,500원
3.
2017.06
구독 인증기관 무료, 개인회원 유료
The purpose of this study is to make a generalized analytical based on the proposed experiments on reinforced concrete(RC) partially infilled frames by U-type precast concrete(PC) wall panels with openings. RC frame and PC wall panels were connected with different strengths. Therefore, we developed modified strut-tie model(STM) with two seismic retrofitting specimens and conducted a nonlinear analysis by using a computer analysis program. Based on the test results, truss member of modified STM was designed, applying the strut-tie model theory of ACI 318M-11 Appendix- A. As a result, the modified STM analysis results were very similar to the experimental results. As a result of the load-displacement curve comparison, the failure load were similar within 5∼17% of error range. In particular, the experimental results and the results of modified STM analysis show that the failure behavior almost matched.
4,200원
4.
2017.06
구독 인증기관 무료, 개인회원 유료
In recent years, the number of earthquakes has increased worldwide. There has been an extreme increase on the Korea Peninsula, which is considered a safety zone for earthquakes. In particular, in the event of earthquakes, most structures on the Korea Peninsula are severely damaged, because most are not designed to withstand them. Damage to and destruction of civil structures, such as bridges, nuclear facilities, and dams, is worse than that of other structures. It is necessary to evaluate and predict the extent of damage by earthquake magnitude, as the magnitude of earthquakes is increasing as well as the frequency. A major feature of the occurrence of earthquakes is uncertainty. For this reason, it is necessary to adopt a stochastic approach, and studies using this approach are increasing. However, although there have been several studies on bridges and nuclear facilities, there have been few studies on probabilistic seismic risk evaluation for multi-functional weirs. Thus, this study presents 3D multi-functional weirs and performs a time history analysis by using LS-DYNA, a general structure analysis program. Probabilistic seismic fragility assessment is conducted by Monte Carlo simulation.
4,000원
5.
2017.06
구독 인증기관 무료, 개인회원 유료
Among the Fire Protection in the interior representative case are spray coat, board, Paint. Intumescent paint has been developed that price competitiveness manufactures and Fire-resistances certificate was verified by experiment. Recent three-hour fire resistance performance developed Intumescent paint is applied as a high-rise, and major structures designed according to the refractory needs to be more efficient. However, domestic and outside the thermal properties of Intumescent paint materials are not proposed. Meanwhile, Intumescent paint in fire is built char layer since the 500∼60 0℃ and middle layer is formed by the decuple intumescent char more then cover thickness at room temperature. It is cut temperature flow off to the steel surface. Nonetheless, Bond Strength of steel and paint deprive as the intumescent char increases. and then steel surface are exposed to flame instantaneously. In this study, intumescent char estimate according to structural parameter(Fire resistance, cover thickness, shape ratio).
4,000원
6.
2017.06
구독 인증기관 무료, 개인회원 유료
In this study, the land use is analyzed by using the SWMM-LID (Low Impact Development) program to minimize the environmental damage caused by the development. In order to effectively utilize pre - development hydrological conditions, we analyzed the land use of existing industrial complex. The study areas selected were a completed industrial complex and an ongoing industrial complex in order to effectively identify the characteristics of the industrial complex and the water circulation system. Numerical simulation used SWMM-LID to enable quantitative hydrological impact assessment of penetration, storage facilities and LID planning elements. In the case of natural conditions, the infiltration amount was 16.3% and 1.5% of the total rainfall at B, C point, respectively. However, after applying the existing land use plan, the infiltration amount at point B was 12.1% and at point C was 3.9 %. In the case of point B, the amount of infiltration decreased due to the development of greenery as an impervious site. On the other hand, the amount of infiltration at point C increased as the existing industrial complex was replaced by greenery. Therefore, high infiltration amount can be secured when land use plan is redeveloped in green areas or parks in areas where the permeability coefficient is high according to the ground conditions in the complex. Two types of bio-polymer soil were developed to increase the LID effect and were tested to compare typical soil with these bio-polymer soils.
4,000원
7.
2017.06
구독 인증기관 무료, 개인회원 유료
Recently, measures for reducing noise and vibration of a railroad station are actively being developed to enhance its property value and comfort level of passengers. In this paper, the applicability of the recently developed vibration mitigation method utilizing a platform TMD (Tuned Mass Damper) by installing a spring-damper system beneath the platform is experimentally verified using a bench scale structure. The two-story bench scale structure is built to simulate a real railroad station, and vibration reduction effect is verified by comparing acceleration before and after applying the platform TMD at the 2nd floor of the structure. The design parameters of the platform TMD system is determined based on vibration analysis result and the MTMD (Multiple TMD) theory recently developed to enhance the effectiveness of the platform TMD method. The vibration is excited to the bench-scale structure using a vibrator. The performance test result for a spring-damper system is also presented. The result of the experiment reveals that the platform TMD method can reduce the vibration of the bench-scale structure by greater than 5dB(V).
4,000원
8.
2017.06
구독 인증기관 무료, 개인회원 유료
This paper presents a vibration mitigation method for a railroad station using dual layer TMD (Tuned Mass Damper) technology. The proposed technology can be applied to a platform by installing a spring-damper system between the platform and the railroad station structure. Especially, considering passenger comfort, the technology is developed for not just reducing the vibration of the railroad station structure but minimizing the vibration of the platform. The technology consists of two serially connected masses, and the vibration of the top mass is designed to be minimized, while the bottom mass serves as the platform TMD. The design parameters such as the spring constant and damping coefficient of the dual layer TMD system are optimized using the acceleration response of the structure, at which the platform is installed. The feasibility and performance of the vibration mitigation method is verified via a numerical example of a simple beam structure subjected to a moving load, which can be analogized as a railroad station with a moving train on top. The result of the numerical study shows that the proposed method can effectively reduces the vibration of the top mass as well as the beam structure at the design speed of the moving load.
4,000원
9.
2017.06
구독 인증기관 무료, 개인회원 유료
Deep learning techniques are being studied and developed throughout the medical, agricultural, aviation, and automotive industries. It can be applied to construction fields such as concrete cracks and welding defects. One of the best performing techniques of deep running is CNN technique. In this study, we analyzed the classification of handwritten images using CNN technique before applying them to construction field. Deep running is generally more accurate with deeper layers, but analysis cost is high. In addition, many variations can occur depending on training options. Therefore, this study performed a parametric study to be a reference when CNN technique was applied through accuracy analysis according to training options.
4,000원
