• Title/Summary/Keyword: lateral drift

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Seismic Fragility Analysis of a RC Bridge Including Earthquake Intensity Range (지진강도 범위를 고려한 철근콘크리트 교량의 지진취약도 해석)

  • Lee, Do Hyung;Jeong, Hyeon Do;Kim, Byeong Hwa
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.38 no.5
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    • pp.635-643
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    • 2018
  • In the present study, influence of earthquake intensity range on seismic fragility analysis of a RC bridge has been evaluated. For this purpose, a RC bridge damaged by a past earthquake has been selected, and analytical model of the bridge has been developed for nonlinear dynamic time-history analysis. A total of 25 recorded earthquake motions have been employed for the nonlinear analysis from which maximum lateral drift ratio of piers are obtained. Then, seismic fragility analysis has been conducted for the bridge using the nonlinear analysis results. Probability of exceeding damage has been computed in terms of using the maximum likelihood estimation, and effect of earthquake intensity range of the motions on seismic fragility curves has been assessed analytically. Analytical predictions indicate that the earthquake intensity range is of utmost significance for rationale seismic fragility analysis reflecting a physical damage state of a bridge and seismic performance evaluation of such bridge.

Performance Evaluation of the Drift Control in Residential Tall Building Using the Dampers (제진장치를 적용한 초고층 주거형 건축물의 횡변위 제어 성능 평가)

  • Park, Ji-Hyeong;Kim, Tae-Ho;Kim, Ook-Jong;Lee, Do-Bum
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.21 no.3
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    • pp.265-273
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    • 2008
  • The problem controlling lateral drift by the wind and the earthquake is very important in high rise buildings. But, outrigger system, generally used for residential tall buildings in Korea, has weak points with the occupancy of special space, the difficult construction and the long duration of works. On the other hand, the damper reduces story drifts of building structure by absorbing vibration energy induced by the dynamic loads and the application of damper systems is relatively simple. Also, the lateral drift control system such as outrigger system may raise the wind vibration problem of serviceability like human comfort and this problem may need another vibration control devices. Accordingly, we analyze the effect of the drift control using various dampers to substitute for outrigger system as the efficient system in residential tall buildings.

Design Strength of Coupled Shear Wall System according to Variation of Strength and Stiffness of Coupled Shear Wall (병렬전단벽의 강도와 강성이 커플링보의 설계내력에 미치는 영향)

  • Yoon, Tae-Ho;Kim, Jin-Sang
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.10
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    • pp.743-750
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    • 2016
  • In this research, the effects of the strength and stiffness of shear walls on the design strength of coupling beams are studied in the shear wall-coupling beam structural system widely used as the lateral-drift resistant system of high-rise buildings. The results show that the design strength of the coupling beams decreases with decreasing concrete strength and core wall thickness, but the shape remains unchanged. In all six models, the design strength of the coupling beams has the largest value at the 10~15th floors in a 40-story building. In other words, the design strength of the coupling beams has the largest value at 0.25H~0.375H where the inflection point exists. The thicker the walls, the smaller the change in the member forces. The thickness of the coupled shear walls has more influence on the design strength of the coupling beams than the concrete strength.

Nonlinear Analysis of Large Concrete Panel Structures subjected to Cyclic Loads (반복하중을 받는 대형 콘크리트 판구조의 비선형 해석)

  • 정봉오;서수연;이원호;이리형
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 1994.10a
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    • pp.113-120
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    • 1994
  • Large Concrete Panel Structures behave quite differently from frame or monolithic shear wall structures because of the weakness of Joint in stiffness and strength. The joint experiences large deformation such as shear-slip in vertical and horizontal joint and rocking and crushing in horizontal joint because of localized stress concentration, but the wall panels behave elastically under cyclic loads. In order to describe the nonlinear behavior of the joint in the analysis of PC structures, different analysis technique from that of RC structures is needed. In this paper, for analysis of large concrete panel subassemblage subjected to cyclic loads, the wall panels are idealized by elastic finite elements, and the joints by nonlinear spring elements with various load-deflection relationship. The analytical results are compared with the experimental results on the strength, stiffness, energy dissipation and lateral drift, and the effectiveness of this computer analysis modelling technique is checked.

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An Evaluation of the Dampers for the Drift Control in Resident Tall Building (초고층 주거형 건축물의 횡변위 제어를 위한 제진장치의 적용성 평가)

  • Park, Ji-Hyeong;Kim, Tae-Ho;Kim, Ook-Jong;Lee, Do-Bum
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2008.04a
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    • pp.499-504
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    • 2008
  • Recently, the problem controlling lateral drift is important in tall buildings for improvement in economic efficiency and habitability. But, the Outrigger System, general used for tall building in Korea, has weak points with the occupancy of special space and the long duration of works. The dampers are applied to actively control building's response by earthquake and wind load in these days. Accordingly, we analyze the effect of the drift control using various dampers to substitute for the Outrigger System as the efficient system in tall buildings.

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Effective Beam Width Coefficients for Lateral Stiffness in Flat-Plate Structures

  • Park, Jung-Wook;Kim, Chul-Soo;Song, Jin-Gyu;Lee, Soo-Gon
    • KCI Concrete Journal
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    • v.13 no.2
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    • pp.49-57
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    • 2001
  • Flat-plate buildings are commonly modeled as two-dimensional frames to calculate unbalanced moments, lateral drift and shear at slab-column connections. The slab-column frames under lateral loads are analyzed using effective beam width models, which is convenient for computer analysis. In this case, the accuracy of this approach depends on the exact values of effective beam width to account for the actual behavior of slab-column connections. In this parametric study, effective beam width coefficients for wide range of the variations are calculated on the several types of slab-column connections, and the results are compared with those of other researches. Also the formulas for effective beam width coefficients are proposed and verified by finite element analysis. The proposed formulas are founded to be more suitable than others for analyzing flat-plate buildings subjected to lateral loading.

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Drift Control of the Structure Using Elasto-Plastic Hysteretic Dampers in High Rise Buildings (탄소성 이력댐퍼를 적용한 초고층 건축물의 변위제어)

  • Park, Ji-Hyeong;Park, Tae-Won;Kim, Ook-Jong;Lee, Do-Bum
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2007.04a
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    • pp.851-856
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    • 2007
  • Recently, the matter controlling lateral drift is important in high rise buildings, In particular, seismic control dampers, such as mass damper and hysteretic damper, are emerging in the field of actively reducing drift. But. seismic control dampers have weak points with the lack of quantitative analysis and maintenance of the device. Accordingly, in this study we examine the structural characteristic of Steel Elasto-Plastic Hysteretic Damper, which is needless of maintenance, and then consider the basic conditions in the design and construction of the optimal seismic control effect which uses this device.

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Strength and Ductility of R/C Columns with Welded Reinforcement Grids (용접된 띠철근으로 보강한 철근콘크리트 기둥의 강도와 연성)

  • ;Murat Saatcioglu;Mongi Grira
    • Proceedings of the Korea Concrete Institute Conference
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    • 1997.04a
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    • pp.492-499
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    • 1997
  • Experimental research was conducted to investigate structural performance of concrete columns confined with welded reinforcement grids were tested under simulated seismic loading. The columns were subjected to constant axial compression accompanied by incrementally increasing lateral deformation reversals. The results indicate thar welded reinforcement grid can be used effectively as confinement reinforcement provided that the steel used, have sufficient ductility and the welding process employed does not alter the strength and elongation characteristics of steel. The grids improved the structural performance of columns, which developed lateral drift ratios in excess of 3% with the spacing and volumetric ratio of transverse reinforcement similar to those required by the ACI 318-95 Building Code.

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Tests of Slab-Column Connections with Partially Debonded Reinforcement under Cyclic Lateral Loading (부분적인 비 부착 철근을 갖는 슬래브-기둥 접합부의 반복 횡하중 실험)

  • Choi, Jung-Wook;Song, Jin-Kyu
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.11a
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    • pp.13-16
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    • 2006
  • This article summarizes tests conducted on two full-scale interior slab-column connections with and without partially debonded reinforcement subjected to cyclic loading. Each test specimen consisted of a 4.2m square slab with a 355mm square column protruding 1.5m above and below the slab. The slab thickness was 152mm. The specimen with partially debonded reinforcement exhibited more lateral drift capacity than did the specimen with fully bonded reinforcement. With partial debonding of the flexural reinforcement, cyclic load appeared to produce less damage to the connection in the vicinity of the slab-column joint region.

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Study On Optimal Design Of Mega-Structure System For High-Rise Buildings (초고층 메가 구조시스템의 최적설계에 관한 연구)

  • Jung, Eun-Young;Park, Sung-Soo
    • Journal of the Architectural Institute of Korea Structure & Construction
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    • v.33 no.3
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    • pp.21-28
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    • 2017
  • According to these high-rise buildings under construction in Korea in recent years, core walls and mega structural system were introduced as a optimal structural system with a certain scale and plane form, what need to be done included the structural characteristics of this kind of system and the accurate results, and what's more, the study of simple optimization methods should also be investigated. In this paper, models of mega structural system were determined, Approximation concept of Stiffness-Based Optimal Design Technique based on optimal design technique of preceding research and displacement sensitivity analysis were formalized, lateral drift constraint equation was created, rate of change response of structures with the changing of design parameters was determined. The possibility of optimal selection and cross section calculation of mega structural members can be known through those processes.