• 한국구조물진단유지관리공학회 논문집
• /
• 제4권4호
• /
• pp.225-230
• /
• 2000

Recent building structures are superior in its ability but they are light and flexible, and so have problems of vibration. In general, the serviceability of RC slabs was known to be good against vibration because of its hardness. However, recent high-rise apartment slabs are mostly light and long, the serviceability of RC slabs due to vibration could be a problem. In this paper, a basic investigation about vibration problems of RC slabs was performed. Basic information and its influence on vibrations of RC slabs were revealed. Also, its serviceability against vibration was examined. Many tests were conducted on existing building located in Chung-Nam area. As a results, damping ratio, natural frequency, acceleration amplitude and displacement amplitude which were used to examine serviceability of the RC slabs were obtained. These results on the test building proved that its serviceability conditions were satisfied to meet the code against vibration.

• 한국공간구조학회논문집
• /
• 제17권2호
• /
• pp.71-77
• /
• 2017

In this study, the boundary non-linear analysis of the sky bridge subjected to walking load and running load is performed. The sky bridge is installed in the mid-story between two buildings and the walking load and running load induced by pedestrians are measured by load cell. LRB is modeled as a non-linear hysteresis model to accurately represent the behavior of LRB. For the serviceability evaluation of sky bridge, the acceleration responses of sky bridge are analyzed based on ISO 2631-2 and the velocity response are analyzed based on standards Bachmann &Amann. In serviceability evaluation of this sky bridge, the pedestrian can not perceive the vibration except for resonance running loads consequently. Therefore, it is concluded that this sky bridge haven't problem in the serviceability.

• Wind and Structures
• /
• 제30권3호
• /
• pp.275-288
• /
• 2020

High-rise buildings are very slender and flexible. Their low stiffness values make them vulnerable to horizontal loads, such as those associated with wind or earthquakes. For high-rise buildings, the threat to serviceability caused by wind-induced vibration is an important problem. To estimate the serviceability under wind action, the response acceleration of a building at the roof height is used. The response acceleration is estimated by the same wind speed at all wind directions. In general, the effect of wind direction is not considered. Therefore, the response accelerations obtained are conservative. If buildings have typical plans and strong winds blow from relatively constant wind directions, it is necessary to account for the wind direction to estimate the response accelerations. This paper presents three methods of evaluating the response accelerations while considering the effects of wind direction. These three serviceability evaluation methods were estimated by combining the wind directional frequency data obtained from a weather station with the results of a response analysis using wind tunnel tests. Finally, the decrease in the efficiencies of the response acceleration for each serviceability evaluation method was investigated by comparing the response acceleration for the three methods accounting for wind direction with the response acceleration in which wind direction was not considered.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2000년도 춘계학술대회논문집
• /
• pp.955-960
• /
• 2000

This paper evaluates the serviceability of vibration that is induced by people's walking and running when the long span hollow core slab is used. The dynamic characteristics like a natural frequency and a ramping ratio are found by impact loading test on the mock-up structures. Also, the human induced loading test output is evaluated by the various serviceability criteria. As the various serviceability criteria satisfy with this result, the vibration problem of relevant slab caused by people's behavior does not matter.

• Wind and Structures
• /
• 제14권6호
• /
• pp.559-582
• /
• 2011

This paper presents an integrated wind-induced dynamic analysis and computer-based design optimization technique for minimizing the structural cost of general tall buildings subject to static and dynamic serviceability design criteria. Once the wind-induced dynamic response of a tall building structure is accurately determined and the optimal serviceability design problem is explicitly formulated, a rigorously derived Optimality Criteria (OC) method is to be developed to achieve the optimal distribution of element stiffness of the structural system satisfying the wind-induced drift and acceleration design constraints. The effectiveness and practicality of the optimal design technique are illustrated by a full-scale 60-story building with complex 3D mode shapes. Both peak resultant acceleration criteria and frequency dependent modal acceleration criteria are considered and their influences on the optimization results are highlighted. Results have shown that the use of various acceleration criteria has different implications in the habitability evaluations and subsequently different optimal design solutions. The computer based optimization technique provides a powerful tool for the lateral drift and occupant comfort design of tall building structures.

• 한국재난정보학회 논문집
• /
• 제10권2호
• /
• pp.312-318
• /
• 2014

최근의 건축구조물은 대형화되어 가고, 경량화와 유연화에 따라 진동에 의한 사용성 문제가 제기되고 있다. 일반적으로 RC슬래브의 경우 강성이 우수하여 진동에 대해 비교적 사용성이 우수한 것으로 알려져 있으나, 최근에 시공되고 있는 초고층 아파트의 경우 슬래브가 경량화 되어가고 장스팬을 갖게 되어 이에 대한 사용성의 검토가 요구되고 있는 실정이다. 본 연구에서는 기초적인 연구로 RC슬래브에 대하여 진동에 의한 사용성을 검토하여 보았다. 실험에 사용된 구조물은 충남 천안에 위치한 지하1층 지상5층 규모의 구조물이며 교사로 사용되고 있는 구조물이다. 실험은 모래주머니에 의한 충격하중으로 감쇠율과 구조물의 고유진동수를 측정해 보았으며 가속도센서를 이용하여 1인보행, 2인보행, 1인뛸때의 사용성을 검토해 보았다.

• Structural Engineering and Mechanics
• /
• 제70권6호
• /
• pp.765-779
• /
• 2019

Most of the existing evaluation criteria of vibration serviceability rely on the peak acceleration of the structure rather than that of the people keeping their own body unmoved on the structure who is the real receiver of structural vibrations. In order to accurately assess the vibration serviceability, therefore, a full path assessment approach of vibration serviceability based on vibration source, path and receiver is not only tentatively proposed in this paper, taking the peak acceleration of receiver into account, but also introduce a probability procedure to provide more instructive information instead of a single value. In fact, semi-rigid supported on both sides of the structure is more consistent with the actual situation than simply supported or clamped due to the application of the prefabricated footbridge structures. So, the footbridge is regarded as a beam with semi-rigid supported on both sides in this paper. The differential quadrature-integral quadrature coupled method is not only to handle different type of boundary conditions, but also after being further modified via the introduction of an approximation procedure in this work, the time-varying system problem caused by human-structure interaction can be solved well. The analytical results of numerical simulations demonstrate that the modified differential quadrature-integral quadrature coupled method has higher reliability and accuracy compared with the mode superposition method. What's more, both of the two different passive control measures, the tuned mass damper and semi-rigid supported, have good performance for reducing vibrations. Most importantly, semi-rigid supported is easier to achieve the objective of reducing vibration compared with tuned mass damper in design stage of structure.

• 한국지진공학회:학술대회논문집
• /
• 한국지진공학회 1999년도 춘계 학술발표회 논문집 Proceedings of EESK Conference-Spring
• /
• pp.127-134
• /
• 1999

Vibration problem occurring at the metal deck floor system not only reduces the serviceability of a building but also reduces the usability of a floor system. Most problem occurring at the metal deck floor results from the human movement such as walking and running. However the vibration induced by running does not occur continuously except the special case. therefore the floor vibration due to walking was only considered on this paper,. Vibration occurring due to human walking was measured and the corresponding load function was derived through the Fast Fourier Transform(FFT)

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2005년도 봄학술 발표회 논문집(I)
• /
• pp.199-202
• /
• 2005

KCI 2003 provides minimum thickness of slab that satisfies serviceability to static displacement. Previous study (Han, et al. 2003) showed the several slabs that designed according to minimum thickness criteria had floor vibration problem. In this study, evaluate the floor vibration serviceability of KCI 2003 minimum thickness requirements for 2-way flat plate and propose the minimum thicknesses of 2-way slabs that satisfy floor vibration criteria according to several boundary condition. For this purpose, one degree of freedom model is used and Monte Carlo simulation is performed.

• 산업공학
• /
• 제21권1호
• /
• pp.1-7
• /
• 2008

In this paper we study the Minimum Edge Addition Problem(MEAP) to decrease the diameter of a graph. MEAP can be used for improving the serviceability of telecommunication networks with a minimum investment. MEAP is an NP-hard optimization problem. We present two mathematical programming models : One is a multi-commodity flow formulation and the other is a path partition formulation. We propose a branch-and-price algorithm to solve the path partition formulation to the optimality. We develop a polynomial time column generation sub-routine conserving the mathematical structure of a sub problem for the path partition formulation. Computational experiments show that the path partition formulation is better than the multi-commodity flow formulation. The branch-and-price algorithm can find the optimal solutions for the immediate size graphs within reasonable time.