http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
현수교 행어 케이블 파단에 의한 동적확대계수의 해석적 결정법
나현호,김유희,신수봉 한국지진공학회 2014 한국지진공학회논문집 Vol.18 No.6
A suspension bridge is a type of bridge in which the beam is suspended by load-bearing cables. There are two classifications: the self-anchored suspension bridge has the main cable anchored to the bridge girders, and the earth-anchored suspension bridge has the main cable anchored to a large anchorage. Although a suspension bridge is structurally safe, it is prone to be damaged by various actions such as hurricanes, tsunamis and terrorist incidents because its cables are exposed. If damage to a cable eventually leads to the cable rupture, the bridge may collapse. To avoid these accidents, studies on the dynamic behavior of cable bridges due to the cable rupture have been carried out. Design codes specify that the calculated DAF (dynamic amplification factor) should not exceed a certain value. However, it has been difficult to determine DAFs effectively from dynamic analysis, and thus no systematic approach has been suggested. The current study provides a guideline to determine DAFs reliably from the dynamic analysis results and summarizes the results by applying the method to an earth-anchored suspension bridge. In the study, DAFs were calculated at the location of four structural parts, girders, pylons, main cable and hangers, with variations in the rupture time.
계측데이터 분석을 통한 모니터링 데이터의 계측관리기준 재설정
정철헌,안호현,신수봉,김유희 한국구조물진단유지관리공학회 2014 한국구조물진단유지관리공학회 논문집 Vol.18 No.6
현재 공용중인 대부분의 시설물들은 다양한 센서로 구성된 계측시스템을 구축하고 있으며, 시스템에서 계측된 응답 데이터 분석을 통해구조물의 건전성을 평가하고 있다. 건전성 평가 과정에서 적용하는 계측데이터의 계측관리기준은 일반적으로 공용 초기에 설정된 것으로,시공회사 또는 설계회사 소속의 전문가들이 설계기준을 바탕으로 혹은 구조해석을 통해 설정하고 있다. 하지만 실 계측데이터에 적용하기위해서는 이와 같이 설정되는 계측관리기준의 검증이 필요하며, 일부 연구자들은 교량의 관리를 위해 실 계측데이터에 계측관리기준을 적용하여 타당성을 검증하는 연구를 수행하고 있다. 본 논문에서는 통계적 접근방법을 활용하여 기설정된 계측관리기준을 검토하고, 체계적인 계측관리기준 재설정 방안을 제시하였다. 또한 구조물의 실 계측 데이터에 적용하여 그 타당성을 검증하였다. Most operating civil structures measure response data continuously by various types of sensors and evaluate their health conditions. Measurement control criteria for such civil structures are usually defined in the first operating stage by experts working at a construction or engineering company. However, a few studies have been carried to examine the adequacy of these measurement control criteria based on the actual measured data. The paper introduces a systematic way of resetting the measurement control criteria for the measured monitoring data based on the statistical aspects of the measured data. The proposedstatistical approach has been examined with actually measured time-history data from a bridge structure.
金龍斗,申秀澈,徐在信 順天大學校 1983 論文集 Vol.2 No.1
때죽나무 열매의 一般成分과 diethyl ether로 抽出한 組脂肪質에 대한 몇가지 物理化學的 特徵들, 脂肪質의 構成 및 脂肪酸의 組成을 分析한 結果를 要約하면 다음과 같다. 1. 一般分析値는 水分 8.52%, 組蛋白質22.5%, 組脂肪質 43.65%, 炭水化物 22.5%, 灰分이 2.83%였다. 2. 油脂의 比重은 0.928∼0.935, 굴절율은 1.4828∼1.4840, 요오드값은 109.2∼110.4, 비누화값은 191∼199, 산값은 1.1∼2.7, 에스테르값은 189∼195, 불검화물은 3.4%로 불검화물은 다른 植物性 油脂보다 높았다. 3. 脂肪質의 構成은 中性脂質이 98.4%,糖脂質 1.1%, 燐脂質은 0.5%였으며 中性脂質에서 esterified sterol, triglyceride, free fatty acid, free sterol, diglyceride, monoglyceride등 6가지 성분을 분리, 확인하였으며 이중에서 triglyceride 含量이 가장 많았다. 4. 脂肪酸의 組成은 palmitic acid와 stearic acid등의 포화지방산이 12.3%정도였으며 불포화지방산인 oleic acid가 41.5%, linoleic acid 42.3%, linolenic acid 3%가 含有되어 있었다. The lipid components, fatty acid compositions, physical and chemical characteristics of crude oil in Styrax japonica seed were determined and proximate compositions of it were also analyzed. The results were summerized as follows: 1. Proximate components of the seed were shown to be 8.52% moisture, 22.5% crude protein, 43.65% crude fat, 22.5% carbohy drates, 2.83% ash. 2. Physico-chemical characteristics of the seed oil were determined as follows:specific gravity 0.928∼0.935, refractive index 1.4828∼1.4840, iodine value 109.2∼110.4, saponification value 191∼199, acid value 1.1∼2.7, ester value 189∼195, unsaponifiable content 3.4%. The unsaponifiable content of the lipid is more than that of other vegetable oil. 3. Lipid components were 98.4% neutral lipid, 1.1% glycolipid, 0.5% phospholipid. The neutral lipids were fractionated and identified as six components:esterified sterols, triglycerides free fatty acids, free sterols, diglycerides, monoglycerides, and triglycerides is the most content of those. 4. Fatty acid compositions were quantitatively determined by GLC to give 9.7% palmitic acid, 2.6% stearic acid, 41.5% oleic acid, 42.3% linoleic acid, 3% linolenic acid and arachidonic acid were presented in small quantities.