Ju, Young Kyu

In recent years, the number of tall buildings being constructed has been rapidly increasing worldwide. Some buildings have been constructed with triangular exterior structural members, known as diagrid systems, which have been developed for structural effectiveness and architectural aesthetics. Although more buildings with diagrid systems have been proposed and have been entered in design competitions, few studies have been carried out on the behavior of diagrid systems or diagrid nodes. Most im

The steel-concrete composite column is a new composite member that can achieve constructability and economy by filling the empty space in the steel H-flange with concrete. Even before this study was conducted, it had been proven in another study on the axial capacity of a steel-concrete composite column that the steel-concrete composite column with a non-compact section has excellent structural strength. Further studies on flexural-compressive capacity are necessary, though, due to the structura

To improve the serviceability of tall buildings, several types of vibration control systems have been developed. The tuned liquid damper (TLD) has advantages, such as simple adjustment of natural frequency, easy installation, and low maintenance. Since water tanks at the top of tall buildings can be directly modeled as a TLD system, it is more practical than any other vibration control system in Korea. Since most of the tanks in Korea have embossments on the wall, the structural characteristics

비좌굴가새는 우수한 내진성능을 보이는 시스템이다. 그러나 비좌굴가새는 약진이나 바람과 같은 하중에 대하여 에너지를 소산시키 지 못한다. 기존의 비좌굴가새의 풍저항 성능을 개선한 하이브리드 비좌굴가새(H-BRB)는 비좌굴가새와 점탄성댐퍼로 구성된 복합댐퍼시스템의 일종이다. 본 논문에서는 탄성영역에서 H-BRB의 구조성능을 확인하기 위하여 심재가 다른 두 개의 실험체에 대한 실험이 수행되었다. H-BRB 시스템에 대한 탄성영역에서의 거동메케니즘 검증을 위하여 주저항요소와 2차 저항요소의 축변형량과 에너지소산 능력을 비교하였다. 실험결과 댐 퍼부에서 이면전단을 사용한 H-BRB는 우수한 구조성능을 보이며, 고층건물의 사용성 수준을 향상시키기 위하여 적용될 수 있을 것이다.

To improve the noise and vibration problems of the existing public parking systems, new floor system was proposed. This system consists of the Sandwich Plate System(SPS), steel beam and post-tensioned steel tendons. To verify the dynamic characteristics such as the natural frequency and damping ratio of the system, the free vibration test was performed. Test results showed that the natural frequency of the SPS composite beam was 23.8Hz and it was increased by 3.8% by installing the post-tensione

Pushover analysis is commonly used to evaluate the inelastic ultimate capacity of structures. However, pushover analysis is carried out based on constant distributions throughout the incremental analysis, which cannot capture the variation in the acceleration profile due to inelastic behavior. For this reason, when plastic hinges form in structure, constant distributions of lateral forces cannot be used any longer. Conventional dynamic inelastic method by time-history analysis can be used for sp

This study proposes a numerical analysis model whose behavior was analytically repeatable in an actual BRBs. Moreover, the result of the FEA was compared with the result of the existing component capacity test. In addition, six models were proposed, whose unconstrained area varied in length. The unconstrained area whose length proved most efficient was proposed using the verified analytical method to analyze the core's performance, depending on the unconstrained length, among various parameters

This article presents a proposed analytical methodology to determine seismic force-resisting system R-values for steel diagrid framed systems. As current model building codes do not explicitly address the seismic design performance factors for this new and emerging structural system, the purpose of this study is to provide a sound and reliable basis for defining such seismic design parameters. An approach and methodology for the reliable determination of seismic performance factors for use in th

Corrugated web beams for buildings can be used without stiffeners and have higher shear strength than flat webs because of the inclined folds. So far, corrugated web beams are usually combined with PC bridges. Due to thin webs, shear failure of most of the corrugated web beams occurs by shear buckling. Failure modes of the corrugated web beams are complicated; yielding, shear buckling, interaction between the yielding and buckling. Previous researches have been investigating the failure mode of

In this study, we propose a systematic process design method using a convolutional neural network (CNN) for the uniform strain distribution of a Ti-6242 impeller during forging. A convolutional neural network (CNN) is a machine learning algorithm optimized for processing grid-like data, such as images, by identifying patterns within the data. To achieve the design goal with a simple process, we propose a methodological process in which the initial billet passes through three steps: upsetting, pr

Buckling-Restrained Brace is composed of brace core and constraining member for the purpose of restraing the buckling of brace and providing large inelastic deformation of the member. Constraining member such as steel tube wrap around the brace core prevents the buckling of brace core by means of its flexural resistance, and makes sure that the brace members dissipate a large quantity of energy and form stabilized hysteresis behavior. In this study, to examine the component capacity of the buckl