變斷面 部材의 應力解析

김경찬,장대식 영남이공대학 1972 論文集 Vol.1 No.-

Structural members are frequently given profiles widening toward the endes to enable the members to better resist the negative bending moment prevailing at the joints, and design calculations are usually made on the assumption that they are of uniform section, ignoring the potential effect of variation in sectional demensions. This paper considers the extent of such effect and experimentally definess the limit of the size of some such thickening of sections within which such approximate design procedures may result with sufficient engineering practicability.

道路橋標準圖의 解析과 最適設計代案 : (1)슬래브橋와 T빔橋 (1) Slab and T Girder Bridges

金炅燦 嶺南大學校 工業技術硏究所 1982 연구보고 Vol.10 No.2

To facilitate the designs and construction of the common types of highway girder bridge superstructures, the Ministry of Condtruction (MOC) has offered two series of standard plans, 1963 series and 1978 series. Both series are assumed to follow the pertinent specifications in force at the times of their issues and have been widely used by public and practicing engineers as given or with minor modificaions (such as to fit the variated widths). Many shortcomings are noted, however, in these plans, some obvious and some latent, such as non-conforming to the relevant specification requirements, inadequate in strength, over-conservative in details, and uneconomical. This paper analyzes these shortcomings and offers sets of optimized alternative plans which are free of the noted shortcomings, conform with the specification requirements and at the same time economical in construction costs. The alternative plans may be used as given or with modifications as the designers see fit.

리뷰 - "뉴질랜드 방재계획제도 및 조직"

김경찬,Kim, Gyeong-Chan 한국방재협회 2012 방재저널 Vol.14 No.4

道路橋 Prestressed Concrete 合成 1桁의 最適斷面

李普炯,徐鎭國,金炅燦 嶺南大學校工業技術硏究所 1992 연구보고 Vol.20 No.2

The series of standardized sections of prestressed concrete I-girders for highway bridge are analyzed and characteristic relations are derived for the section parameters and applicable girder spans. The validity and the applicability of the equations are investigated with the following observations: 1. The parabolic relations exist between a pair of section parameters and applicable spans in the form of Np*h=c1+c2L+c3L2. 2. The validity of given designs is checked by comparing the design spans with the spans caculated from the equations using the given section parameters. 3. The section profiles are determined to suit given design terms by selecting grider heights and tendons in this equation. This paper thus presents formula for readily establishing the validity of given designs, and selecting section profiles to satisfy given design terms for prestressed concrete composite highway bridge.

도로교 T빔구조의 格子解析

金炅燦 영남대학교 공업기술연구소 1985 연구보고 Vol.13 No.2

A wide range of commonly used patterns of highway T-beam bridge superstructures are analyzed by grid theory and the results are compared with those given by approximate formulas offered in design specifications to investigate the applicability and limitation of the latter with the following observations: 1. Approximate formula, which applies fraction of wheel load to specific beams in the calculation of bending moment and shear, gives close and conservative estimates in the case where wheel load is placed inside the exterior girder, execpt for roadway width over 10m. The formula underestimates in the case where wheel load may be placed outside the exterior girder. The load distribution factor S/1.8 gives closer estimates. 2. Approximate formula, which assigns 110% and 95% of the average load per beam, obtained by total effect caused by trucks loaded on all design lanes divided by the number of beams, respectively to exferior and interior beams, gives fair estivates for limited range of roadway widths closely matching design traffic lanes, such as 6-6.6m for 2-lane and 9-9.5m for 3-lane roadway for exterior beams. Outside this range for exterior beams and in all cases for interior beams, the formula gives erratic estimates. 3. In the application of the formula, para 1 above, the provision that assumes placement of wheel load 30cm from the curb face and no lateral distribution of wheel load placed on the section considered in calculation of shear results in underestimate and renders the formula inoperative.

Motorization 분석에 기초한 중국 자동차산업의 향방

김경찬,정철호,조대현,최부식 포스코경영연구원 2010 POSRI 이슈리포트 Vol.2010 No.11

6차산업화 활성화를 위한 한‧일 정책 비교 연구

김경찬,조석호,예병훈,손용훈 한국농촌계획학회 2015 농촌계획 Vol.21 No.2

Korean sixth industrialization policy is similar to that of Japanese such as goal of policy, setup and promotion method of specific policy projects as it benchmarked a Japanese case. First of all, the certification systems of both countries, the most representative policy, are very alike that the governments officially certificate management bodies, prepare the ground for continuous sixth industrialization, devide intermediate support organization into the central unit and regional unit, and have the function of support and control of sixth industrialization management bodies. Furthermore, both countries create fund for sixth industrialization as an investment support policy, and push forward with the phased support policy businesses such as individual support and connected support for management bodies. However, there are some differences between certification systems of both countries such as process-oriented or result-oriented for certification, subtle differences of the role in support organization, and the range and rate of support.

타원체 방식을 활용한 다중 시점 단안 3차원 동적 객체 탐지

김경찬,김현진 제어로봇시스템학회 2023 제어로봇시스템학회 국내학술대회 논문집 Vol.2023 No.6

아웃리거구조시스템과 메가구조시스템 적용에 따른 철근콘크리트 초고층 건물에 대한 부등축소의 영향

김경찬,김재요,Kim, Gyeong-Chan,Kim, Jae-Yo 한국전산구조공학회 2022 전산구조공학 Vol.35 No.1

초고층 건물에서 수평변위 제어와 수직부재에서 발생하는 부등축소에 대한 검토가 필수적이다. 수평변위 제어를 위해 근래에 아웃리거 구조시스템과 메가 구조시스템을 횡력저항시스템으로 사용한 초고층 건물이 증가하고 있다. 또한, 부등축소로 인한 구조적 문제를 해결하기 위해 부등축소량 예측과 예측결과를 통한 시공단계에서의 보정방법이 연구되어 왔으나 부등축소에 대한 횡력저항시스템의 영향 비교는 드문 편이다. 따라서, 본 논문에서는 수평변위 제어를 위해 아웃리거 구조시스템과 메가 구조시스템을 사용한 60층 규모의 철근콘크리트 주거용 초고층 건물에 대해 시공단계해석을 통한 부등축소를 비교하고 그 영향을 분석하고자 한다. 또한, 부등축소는 비구조요소의 파손 및 구조요소에 부가하중을 유발하기도 하며 부등축소가 야기한 문제는 초고층 건물에서 중요한 부재를 손상시킬 수 있으므로 각 횡력저항시스템별로 수직부재의 부등축소에 대한 영향을 분석하였다. It is essential to control the lateral displacement and differential axial shortening of the vertical elements in high-rise buildings. Recently, an outrigger or a mega structure system has been adopted to control the lateral displacement. Furthermore, to resolve the problems caused by differential axial shortening in high-rise buildings, analytical prediction and correction is often studied; however, the study on the comparisons of the lateral load resisting systems to address differential axial shortening is less. Therefore, in this paper, a 60-story RC residential building using an outrigger or a mega structure system is analyzed with a construction sequence. Moreover, differential axial shortening can result in an additional member force of structural members and failure of non-structural members. These problems caused by differential axial shortening affects the behaviors and can damage the important structure member in the high-rise buildings. Hence, the effects of the systems on differential axial shortening between the vertical elements in high-rise buildings are studied.

BF₃LiMA를 단량체로 하는 고체 고분자전해질 합성과 전기화학적 특성

김경찬,류상욱,Kim, Kyung-Chan,Ryu, Sang-Woog 한국전기화학회 2011 한국전기화학회지 Vol.14 No.4

합성된 $BF_3LiMA$ 리튬염을 단량체로 사용하는 고체 고분자전해질을 제조하고 $BF_3LiMA$의 농도가 이온전도도에 미치는 영향 및 전기화학적 안정성을 교류임피던스 측정법과 선형전위주사법을 통하여 평가하였다. 그 결과 $BF_3LiMA$가 12.9 wt%인 고체 고분자전해질에서 $7.71{\times}10^{-6}S\;cm^{-1}$의 가장 높은 $25^{\circ}C$ 이온전도도가 관찰되었으며 이 값을 전후로 이온전도도는 다소 감소하는 경향이 나타났다. 이러한 결과는 저농도의 $BF_3LiMA$에서 발생할 수 있는 리튬염의 부족과 고농도의 $BF_3LiMA$에서는 발생할 수 있는 고분자기질의 유동성 감소가 원인으로 해석된다. 또한 $BF_3LiMA$ 기반의 고체 고분자전해질은 음이온이 고정되어 있는 자기-도핑형 계열로서 $60^{\circ}C$에서 6.0 V까지 우수한 전기화학적 안정성을 보여주었다. Solid polymer electrolytes using $BF_3LiMA$ as monomer were synthesized by usual one step radical polymerization in THF solvent. The effect of $BF_3LiMA$ concentration on ionic conductivity and electrochemical stability was investigated by AC impedance measurement and linear sweep voltammetry. As a result, the highest ionic conductivity reached $7.71{\times}10^{-6}S\;cm^{-1}$ at $25^{\circ}C$ was obtained in 12.9 wt% of $BF_3LiMA$ content. Further increase or decrease of $BF_3LiMA$ content result to decrease the ionic conductivity due to the brittle matrix properties in former case and the insufficient number of charge carrier in the latter case. Furthermore, since the counter-anion was immobilized in the self-doped solid polymer electrolytes, high electrochemical stability up to 6.0 V was observed even in $60^{\circ}C$.