• Title/Summary/Keyword: Construction adequacy

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A Case Study of a Foundation Design and Construction of a High-rise Building Applying Bi-directional Pile Load Test(BD PLT) (양방향 말뚝재하시험(BD PLT)을 적용한 초고층 건축구조물의 기초설계 및 시공사례)

  • Kim, Sung-Ho;Lee, Min-Hee;Hwang, Geun-Bae;Choi, Yong-Kyu
    • Proceedings of the Korean Geotechical Society Conference
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    • 2006.10a
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    • pp.539-550
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    • 2006
  • New Songdo city is currently developing on the reclaimed land on a marine deposit and among the development the four sixty-four(64) stories high rise buildings are under construction at block 125. The ground condition of the site is comprised of a deep seated weathered rock staratum under a soft marine deposit layer. As a foundation system, a bored pile was planned to transmit the applied load to the stable layer. In this study, the behavior of the weathered rock especially locating at a upper part having a weak strength(HWR, MWR) has been evaluated through series of hi-directional pile load test(BD PLT) carried out on the 3 drilled shafts socketed in a weathered rock layer in a design stage. It has been planned to increase the effect of the tests that the length of test piles was prepared short enough to perform the test under a high stress. The summary of the design reflecting the test results has been made up. In addition, the 4 hi-directional pile tests excuted on the working piles during the construction stage for the purpose of confirmation and the evaluation of the adequacy of the pile behaviors have been included in this study.

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A numerical model for the long-term service analysis of steel-concrete composite beams regarding construction stages: Case study

  • Marcela P. Miranda;Jorge L. P. Tamayo;Inacio B. Morsch
    • Steel and Composite Structures
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    • v.52 no.2
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    • pp.199-215
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    • 2024
  • The Caynarachi Bridge is a 130 m long posttensioned steel-concrete composite bridge built in Peru. The structural performance of this bridge under construction loads is reviewed in this paper using numerical simulation. Hence, a numerical model using shell finite elements to trace its deformational behavior at service conditions is proposed. The geometry and boundary conditions of the superstructure are updated according to the construction schedule. Firstly, the adequacy of the proposed model is validated with the field measurements obtained from the static truck load test. Secondly, the study of other scenarios less explored in research are performed to investigate the effect of some variables on bridge performance such as time effects, sequence of execution of concrete slabs and type of supports conditions at the abutments. The obtained results show that the original sequence of execution of the superstructure better behaves mechanically in relation to the other studied scenarios, yielding smaller stresses at critical cross sections with staging. It is also demonstrated that an improper slab staging may lead to more critical stresses at the studied cross sections and that casting the concrete slab at the negative moment regions first can lead to an optimal design. Also, the long-term displacements can be accurately predicted using an equivalent composite resistance cross section defined by a steel to concrete modulus ratio equal to three. This article gives some insights into the potential shortcomings or advantages of the original design through high-fidelity finite element simulations and reinforces the understating of posttensioned composite bridges with staging.

Analysis of the Importance from Detailed Work (Role) of the Construction Manager for G-SEED Certification in the Design Phase (녹색건축인증을 위한 설계단계 건설사업관리자의 세부 업무(역할)별 중요도 분석)

  • Lee, Duhwan;Kang, Seongmi
    • Korean Journal of Construction Engineering and Management
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    • v.21 no.6
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    • pp.103-112
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    • 2020
  • In this study, based on actual project implementation cases, task management plans for construction management related green building certification were derived in major stages. Accordingly, the importance from details of construction management tasks for the operation and management process of the schematic design phase, design development phase, and construction document phase, focusing on G-SEED certification, was analyzed. In addition, major items were derived based on the weight of additional construction costs and acquisition scores through previous research cases on the analysis of construction costs for G-SEED certification, and the importance from details of construction management tasks on the major items of G-SEED certification was analyzed. As a result, the review and confirmation of the elements of reflection related to G-SEED in the schematic design phase, the adequacy of design documents and the connectivity of design phase in the design development phase were important. And the review and confirmation of the items directly related to the construction phase in the construction document phase were important.

A Study on Design for Anchorage Zone in PSC Box Girder Bridge Using Strut-Tie Model (스트럿-타이 모델을 이용한 PSC 박스거더교량의 정착부 설계 연구)

  • 이주하;윤영수;이만섭;김병석
    • Proceedings of the Korea Concrete Institute Conference
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    • 2002.10a
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    • pp.625-630
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    • 2002
  • PSC box girder is widely used in a domestic bridge and overpass, etc., therefore, the design and construction technique for the PSC box girder is developing day by day. Even if it were so, however, the design for anchorage zone in PSC box girder has depended on common sense and empirical results. And it is the current situation that the designer has difficulty due to inadequacy of provisions in the domestic design code and lack of understanding for behavior of anchorage zone. Besides, the design based on Leonhardt's method is being done in general, but the design may be various even for the same structure because of the difference in a way of applying. In this paper, therefore, anchorage zone in PSC box girder bridge is analyzed and designed by using strut-tie model. Adequacy for the application of strut-tie model is verified by comparison with the way used in current design practice, and this study presents that strut-tie model can be a rational and an economical design than current design methods.

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A Study on the Capacity Payment in Cost Based Pool (비용기반 전력시장에서의 용량요금 산정방안에 관한 연구)

  • Han, Seok-Man;Kim, Balho H.
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.9
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    • pp.1531-1535
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    • 2008
  • In the past vertically integrated power system, the power utility forecasted power demand and invested new power plants to keep a system adequacy. However, in the competitive electricity markets, a principle part of the capacity investment is market participants who decided the investment to maximize their profit. Especially, one of the main factors in their long-term decision making is the retrieval of fixed costs (construction costs). This paper presents the capacity payment in electricity power markets. The capacity payment (CP) in Cost Based Pool (CBP) is needed to recover fixed costs. However, CP in CBP was applied not only recovering fixed costs but also ensuring supply reliability. In order to operate harmonious power markets, pool needs reasonable CP mechanism. This paper analysis CP using capacity proportion and Reliability Pricing Model (RPM).

A study on the Composition of food and it's nutritional mix for preparation of Korean Menus (한국인 식단작성을 위한 식품구성 및 그 영양적 배합에 관한 연구)

  • 이기열
    • Journal of the Korean Home Economics Association
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    • v.17 no.2
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    • pp.10-29
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    • 1979
  • Nowadays various organizations, such as hospitals, workers, students and families are requesting a model sample of standardized Korean meal plan to meet their nutritional requirement with daily food intake. Practical application of nutritional requirement in Korean meal is not yet established. This mainly comes form the lack of the research works on experimental cookery for the right amount of recipes of Korean meal , and no effect was ever paid for this angle by many specialist. Therefore, it is urgent to research and construct the standardized meal plan for Korean people. Contents of the present research are as follows ; 1) Standardization of recipes and the amounts : Various kinds of daily foods were selected for the purpose of recipes. The standardization of the recipes and the right amount were continuously attempted. 2) Research on the construction of nutritional meal plan : The method of constructing harmonious meal plan based upon the requirement, were studied. And the meal plans were constructed according to the different units of ages. Special meal plans were also constructed for the pregnant women and lactating women. 3) Evaluation for the nutritional adequacy were followed after the setting the various recipes.

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Power System Simulation in Seoul matropolitain subway Line-6 system (서울 지하철 6호선에 대한 전력계통 시뮬레이션)

  • Lee, Tae-Shik;Moon, Young-Hyun;Sung, Soo-Young;Yoon, Kap-Koo
    • Proceedings of the KIEE Conference
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    • 1993.07a
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    • pp.137-139
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    • 1993
  • This paper details methods used to verify the adquacy of a dc traction power supply for design in Seoul matropolitain subway Line-6 system. Examples of the approach are given for a major subway presently under construction. The performance of trains operating at maximum system design capacity is modelled using a train simulation program. Using a dc network analyser program, the maximum train operating timetable, and a model of the ac and dc electrical suppy system, the electrical performance of the entire system can be modelled over a 24-hour period. The results of this analysis are used to determime: train voltage at a level sufficient to ensure train schedules: adequacy of traction transformers, rectifier, and switchgear ratings; sizes of the overhead contact systern conductors, and ac and de feeder cables: and power and energy demands at the utility company's supply points for inital and final timetable operations.

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Strategic Electricity Resource Planning using EGEAS Model (EGEAS 모형을 활용한 전략적 전원개발 계획)

  • Kwon, Y.H.;Kim, C.S.
    • Proceedings of the KIEE Conference
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    • 1993.07a
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    • pp.144-147
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    • 1993
  • The long-term electricity resource planning of electric utility has undergone significant change during the past decade. The current resource planning can be considered as multi-objective decision making procedure under the various uncertainties such as demand growth, construction cost, fuel price, environmental regulation, plant site, financial adequacy, new technology advent and so on. This paper presents a standardized electricity resource planning scheme using the strategic planning concept. EGEAS computer model was fully applied to indentify feasible alternative plans and simulate various attribute values corresponding each alternative plan and future. As a case study, a hypothetical long-ten capacity expansion planning problem is analyzed.

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Effective CFRP retrofit strategy for flexural deficient RC beams

  • Banjara, Nawal Kishor;Ramanjaneyulu, K.
    • Structural Engineering and Mechanics
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    • v.69 no.2
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    • pp.163-175
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    • 2019
  • Structural deterioration arises due to aging, environmental effects, deficiencies during design and construction phase, and overloading. Experimental and numerical investigations are carried out in this study to evaluate the performance of control and flexural deficient reinforced concrete (RC) beams under monotonic loading. Three levels of flexural deficiency are considered in this study. After confirming load carrying capacities of control and flexural deficient beams, the flexural deficient RC beams are strengthened with carbon fibre reinforced polymer (CFRP) fabric. CFRP strengthened RC beams are tested under monotonic loading and compared with the performance of control specimen. Further, non-linear finite element analyses are also carried out to evaluate the flexural performance of control, deficient and CFRP strengthened flexural deficient RC beams. There is good correlation between results of experimental and numerical investigations. Numerical approach presented in this study can be adopted for assessing the adequacy of CFRP retrofit measure.

Adequacy Analysis of Tunnel Management System in terms of Operational Safety (터널관리시스템의 안전운영 적정성 분석)

  • Park, Bumjin;Roh, Chang-Gyun;Moon, Byeongsup
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.14 no.5
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    • pp.1-12
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    • 2015
  • Length and the number of tunnels has increased 10% annually. Tunnel construction has positive effect in nature and driving condition. However, the structure of tunnels lead to a greater probability of major accidents. For this reason, tunnel is focusing its attention on the rapid incident handling and disaster management to build a tunnel management system in recently. In this study, tunnel management system adequacy analyzed in terms of operational safety using IPA and AHP analysis. IPA analysis results using the portfolio chart, incident management factors has a large gap between important and satisfaction. Disaster management is analyzed high ranking in priority. However, incident management factors are derived first priority in AHP analysis. This study determined that the results are meaningful to practitioners in the field is determined. In addition, practitioners comments should be reflected primarily for tunnel operational safely.