• Explosives and Blasting
• /
• v.31 no.1
• /
• pp.1-10
• /
• 2013

In blasting demolition, a method would be chosen among many depends on shape and system of a structure and its surround. To demolish using explosives a structure, which is asymmetric and with high aspect ratio, pre-weakening, explosive locations, detonating delay, and surround conditions are needed to be considered in front to design blasting demolition plan. In this study, to over turn asymmetric and high aspect ratio structure in safe, a simulation using a software named Extreme Loadings for Structures, ELS, had performed. In results, it is achieved optimized pre-weakening shapes and locations, which prevent kick back motion of the structure when it collapse, by analyzing moment distribution caused by pre-weakening. And of structural collapse and by minimizing asymmetric structure's torsional moment. Also, after the demolition, simulation results are also compared with actual collapse behavior. In results, it is confirmed the accuracy of collapse behaviour simulation results, and in blasting demolition, kick back motion can be controled by adjusting pre-weakening shape and location, and the torsional moment of an asymmetric structure also can be solved by optimizing detonation locations and its time intervals.

• Journal of the Korea institute for structural maintenance and inspection
• /
• v.22 no.5
• /
• pp.101-109
• /
• 2018

Modular structural systems have been used increasingly for low- and mid-rise structures such as school and apartment buildings. Studies have recently been conducted on the application of the modular structural system to high-rise buildings. To provide sufficient resistances and economical construction for the high-rise modular structural system, a composite unit modular structure was proposed. In this study, the strength of the non-symmetric composite column for the proposed composite unit modular structure was investigated through a series of tests. The experimental study focused on the effect of the slenderness of the column, eccentricity, and through bars on the strength of such a column. Design equations for the non-symmetric column for a modular unit structure were also proposed. From the results, it was found that the proposed design equations provide reasonable strength prediction of the non-symmetric composite column for the modular unit structure.

• Computational Structural Engineering
• /
• v.10 no.2
• /
• pp.5-12
• /
• 1997

최근 지진에서 발생한 건물의 손상을 살펴보면, 지진하중을 받는 건물의 3차원 거동에 의해서만 설명할 수 있는 경우가 많이 있다. 특히, 비대칭의 평면을 가지는 건물에서 발생하는 비틀림 거동은 2차원 모델로는 파악하기가 어렵기 때문에 구조물과 개별 부재의 3차원 거동을 보다 정확히 이해함으로써 구조물의 내진능력을 더 정확히 평가할 수 있다. 이를 위해서는 3차원 모델에 의한 비탄성 동적해석이 필요하게 된다. 현재, 전산기의 발달과 더불어 많은 자유도를 요구하는 3차원 구조물의 비탄성해석이 가능해지고, 구조부재의 비탄성거동에 관한 많은 실험으로 다양한 구조부재의 모델이 개발되어 지진에 대한 건물의 설계시 개인용 컴퓨터를 사용하여 이러한 3차원 비탄성 동적해석의 반영이 가능하게 되었다. 실제로 지진이 많이 발생하는 국가에서는 비탄성해석에 대해 많은 연구들이 진행되고 있으며, 일부 국가에서는 건물의 내진설계시 강진에 대한 비탄성해석을 요구하고 있다. 이 글에서는 삼성건설 기술연구소에서 도곡동 102고층 건물의 해석에 사용하였던 3차원 비탄성 동적해석 프로그램인 CANNY-E에 대하여 그 구성과 특징을 소개하고자 한다.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.12 no.3
• /
• pp.91-105
• /
• 1992

For the analysis of multistory frames with sidesway, no adequate procedures can be found in the classical methods of structural analysis. Even well-known procedures such as the slope-deflection method and the moment distribution method may not be effective tools since those methods require a multiple of computational labor and/or yield results of approximate values. In this study, a direct method is developed and proposed for the analysis of multistory frames with sidesway, which is due to the lateral loads, asymmetry of the structure itself, or asymmetry of vertical loadings. The proposed method is to obtain simple forms of equations derived by a mathematical formulation of the moment distribution procedure combined with successive correction concept. Numerical illustrations show that the results obtained by the proposed method agree well with those by rigorous ones. Undoubtedly, this newly developed method can be applied more easily for the analysis of structural frames without joint translation as well as continuous beams.

• Journal of the Earthquake Engineering Society of Korea
• /
• v.11 no.5
• /
• pp.11-21
• /
• 2007

Currently in the country, the necessity of seismic analyses is increasing due to the increase of demand and interest in seismic design. Especially, shear wall apartments are constructed mostly for a residental building so seismic analyses for the apartment are actively executed. For the seismic analysis of the shear wall apartment, it may be not efficient in time and effort to model the entire structure by a finite element mesh. Therefore, an equivalent model is needed to simulate the dynamic behavior of the structure by decreasing the number of degrees of freedom. In this study, a method to form an equivalent model that is simple and easy to use was proposed utilizing effective mass coefficient that is highly correlated to mode shape of the structure. This equivalent model was obtained by replacing a shear wall structure with an equivalent frame structure having beams and columns. This model can be used very effectively when excessive seismic analyses are necessary in a short period because it can be operated in any commercial program and reduce the analysis time. Also, it can model floor slabs so it can represent the actual behavior of shear wall apartments. Furthermore, it is very excellent since it can represent the asymmetry of the structure.