• Title/Summary/Keyword: core wall

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Corner Steel plate-Reinforced Core Wall System

  • Park, Hong-Gun;Kim, Hyeon-Jin;Park, Jin-Young
    • International Journal of High-Rise Buildings
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    • v.8 no.3
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    • pp.193-199
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    • 2019
  • For better structural performance and constructability, a new composite core wall system using steel plate columns at the corners of the core section was developed. Using the proposed core wall, nonlinear section analysis and 3-dimensional structural analysis were performed for the prototype core wall section and super high-rise building, respectively. The analysis results showed that, when compared to traditional RC core wall case, the use of the corner steel plate columns provided better structural capacity, which allows less wall thickness and re-bars. Further, due to such effects, the construction cost and time can be reduced despite the use of steel plate columns.

Characteristics of Insulation of Core Wall for Traditional Rural House (Earthen House) (전통 농촌주택(흙집) 심벽의 단열 특성)

  • 리신호
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.45 no.5
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    • pp.126-132
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    • 2003
  • The insulation characteristics of earthen core wall were studied in this paper. The overall heat transfer coefficients(U) were obtained through experiment in accordance with Korea Industrial standards. The result of the experiment are compared with the Regional Overall Heat Transfer Coefficient(U) of Building. This results inform that core wall with soil can be used as building walls because the insulation characteristics agree to the rule of building standards.

An Analysis of Planning Practice for Reinforced Concrete Core-Wall Construction in High-Rise Building Construction (초고층건물 R/C조 코어월 선행공사의 시공계획 실무에 관한 분석)

  • Ahn Byung-Ju
    • Korean Journal of Construction Engineering and Management
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    • v.5 no.2 s.18
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    • pp.194-201
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    • 2004
  • Core-wall construction method is applied in many high-rise building constructions. This is caused by the advantages of the method such as the effect of saved construction cost and shortened period. However, the analysis study of planning practice for core-wall construction shows matters take place during core-wall construction, such as increasing in construction cost and period. These matters result from the limited work space leading to low productivity, the activity interference leading to increasing in period, additional temporary work cost and time, and delayed concrete pour activity. A large part of these can be prevented taking place by very detailed and most careful core-wall construction plan. Therefore, this study suggests improvement directions of core-wall construction planning process focused on the cooperation system of a contractor between a sub-contractor and the process.

Relationships for prediction of backstay effect in tall buildings with core-wall system

  • Karimi, Mahdi;Kheyroddin, Ali;Shariatmadar, Hashem
    • Advances in Computational Design
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    • v.5 no.1
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    • pp.35-54
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    • 2020
  • One of the prevailing structural systems in high-rise buildings is the core-wall system. On the other hand, the existence of one or more underground stories causes the perimeter below-grade walls with the diaphragm of grade level to constitute of a very stiff box. In this case or a similar situation, during the lateral response of a tall building, underground perimeter walls and diaphragms that provide an increased lateral resistance relative to the core wall may introduce a prying action in the core that is called backstay effect. In this case, a rather great force is generated at the diaphragm of the grade-level, acting in a reverse direction to the lateral force on the core-wall system, and thus typically causes a reverse internal shear. In this research, in addition to review of the results of the preceding studies, an improved relationship is proposed for prediction of backstay force. The new proposed relationship takes into account the effect of foundation flexibility and is presented in a non-dimensional form. Furthermore, a specific range of the backstay force to lateral load ratio has been determined. And finally, it is shown that although all suggested formulas are valid in the elastic domain, yet with some changes in the initial considerations, they can be applied to some certain non-linear problems as well.

Experiment on Seepage in Varied Section of Core Wall for Fill Dam Design (필댐 제체심벽(堤體心壁)의 단면변화(斷面變化)에 대한 침투류해석(浸透流解析)에 관한 실험적(實驗的) 연구(硏究))

  • Jin, Byung Ik;Kim, Jae Hong
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.5 no.1
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    • pp.55-64
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    • 1985
  • This thesis, intended to establish the design criteria of core wall of a Fill Dam, has determined after a series of twenty one analytic experiments on the seepage flows in various types of core wall that the rates of rise and fall of the seepage flow changing in accordance with the variation of core wall cross section, which is to say, the transformation of slope inclination. Particularily the appropropriate design inclination was examined for the sloped core wall. Putting the resulting values into the existing approximate theoretical function has revealed the volume of theoretical seepage flows. With this result, the experiment values was compared and interestingly enough, a theoretical formula was found which is considered to be the nearest one to the resulting values of the experiment. It is also discussed in the papers that the seepage alignment and flows in the sloped core wall section that inclined to the upstream and the adoptability of the theoretical function which has been known up to present. Based on the above mentioned study it is anticipated that thesis should be available for determination of the cross section in the core wall design of a Fill Dam as large amount of references as it can be.

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Optimum location of second outrigger in RC core walls subjected to NF earthquakes

  • Beiraghi, Hamid;Hedayati, Mansooreh
    • Steel and Composite Structures
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    • v.38 no.6
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    • pp.671-690
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    • 2021
  • Seismic responses of RC core wall with two outriggers are investigated in this study. In the models analyzed here, one of the outriggers is fixed at the top of the building and the second is placed at different levels along the height of the system. Each of the systems resulting from the placement of the outrigger at different locations is designed according to the prescriptive codes. The location of the outrigger changes along the height. Linear design of all the structures is accomplished by using prescriptive codes. Buckling restrained braces (BRBs) are used in the outriggers and forward directivity near fault and far fault earthquake record sets are used at maximum considered earthquake (MCE) level. Results from nonlinear time history analysis demonstrate that BRB outriggers can change the seismic responses like force distribution and deformation demand of the RC core-walls over the height and lead to the new plastic hinge arrangement over the core-wall height. Plasticity extension in the RC core wall occurs at the base as well as adjacent to the outrigger levels. Considering the maximum inter-story drift ratio (IDR) demand as an engineering parameter, the best location for the second outrigger is at 0.75H, in which the maximum IDR at the region upper the second outrigger level is approximately equal to the corresponding value in the lower region.

State of Practice of Performance-Based Seismic Design in Indonesia

  • Sukamta, Davy;Alexander, Nick
    • International Journal of High-Rise Buildings
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    • v.1 no.3
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    • pp.211-220
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    • 2012
  • The current 2002 Indonesian Seismic Code consists of prescriptive criteria that are intended to result in buildings capable of providing certain levels of performance. However, the actual performance capability of buildings is not assessed as part of the code procedures. Several analysis procedures are allowed, and the state of practice is to use the RSA with six-zone seismic map developed for 475-year earthquake. This code is being revised and will adopt many of the ASCE7-10 provisions and 2475-year earthquake for MCE. The growth of tall buildings compels engineers to look for more optimal lateral system. The use of RC core wall as single system has been adopted by very few engineering firms, which is allowed in the current code but will no longer be the case if the new one is in effect. Other innovative structural system such as core wall and outrigger is not addressed in the proposed new code. Engineers must then resort to NLRHA. Currently, one 50-story building under construction using RC core wall and outrigger has been designed with RSA and employing capacity design principles, then evaluated using NLRHA per TBI Guidelines. Based on the evaluation, the performance of the 50-story building generally still meets the criteria of the TBI Guidelines. The result of the case study is presented in this paper.

Improving Construability by Analyzing Influencing Factors of Core-Wall Construction (코어월 선행공법의 영향 요소 분석을 통한 시공성 향상에 관한 연구)

  • Ku Seong-Hun;Ahn Byung-Ju;Kim Jae-Jun
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • autumn
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    • pp.606-609
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    • 2003
  • The need of high-rise building is increased, because population is concentrated and the building site is limited in the city. Owing to this request buildings in downtown become more high rise. Therefore, we must develop the design, structure, high technology and materials. The core wall construction is one of the method of construction preferred because it cut down the cost and decrease the schedule. According to research in this study, we found that the selection process of core wall system form is focused on the schedule and cost. the construability is relatively failed to notice. As a result, the problem of construability is happened under the construction, it lead to delay the schedule and increase the cost. The purpose of this study is suggest to decision making process of core wall system form considered improving construction productivity.

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Shear Lag Phenomenon of Tube Structure with Core Wall in Relation to Nondimensional Structural Parameters (튜브-전단벽 구조의 무차원 구조변수에 따른 전단지연 현상)

  • 유은정;이강건;이리형
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2003.10a
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    • pp.325-332
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    • 2003
  • The tube structures act like cantilevered box beams and effectively resist lateral loads. In result, they are adopted as a high-rise buildings system. However, the shear lag in tube system prevents the idealized tube behavior such as a cantilevered box beam. Therefore, the studies on shear lag phenomena are necessarily requested. The presented papers are almost studied on framed tube structures and tube in tube structures. However, the study on the shear lag in the tube structure with core wall is lack. Thus, in this paper, the shear lag of the structure is studied. The shear lag coefficient is defined to investigate shear lag phenomena. However, existing shear lag coefficients are not adequate for understanding them. Therefore, on this study, new shear lag coefficient is suggested. In addition, the shear lag in the tube structure with core wall is analyzed by changing the five structural parameters of stiffness factor in frame, stiffness factor in wall, stiffness ratio, the number of stories and the number of bays.

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Free vibration of core wall structure coupled with connecting beams

  • Wang, Quanfeng
    • Structural Engineering and Mechanics
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    • v.10 no.3
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    • pp.263-275
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    • 2000
  • In this paper, a core wall structure coupled with connecting beams is discretized and modeled as an equivalent thin-walled member with closed section, while the connecting beams between openings are replaced by an equivalent shear diaphragm. Then, a numerical method (finite member element method, FMEM) for dynamic analysis of the core wall structure is proposed. The numerical method combines the advantages of the FMEM and Vlasov's thin-walled beam theory and the effects of torsion, warping and, especially, the shearing strains in the middle surface of the walls are considered. The results presented in this paper are very promising compared with the ones obtained from finite element method.