• Title/Summary/Keyword: composite members

Search Result 607, Processing Time 0.027 seconds

Quantity survey system for column-beam structure comprised of composite precast concrete members (합성 PC 라멘조를 위한 물량산출 시스템)

  • Lim, Chaeyeon;Kim, Sunkuk
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2014.05a
    • /
    • pp.48-49
    • /
    • 2014
  • Green Frame is a column-beam system that uses composite precast concrete members. Previous studies have proven this system to be not only structurally safe, constructible, and economically feasible, but also environmentally-friendly. If the computerized program is used to estimate the quantity, the result of it shall be calculated much easily, quickly and exactly than manual estimation, because precast concrete members of Green Frame has standard size and connection method between it. Therefore, this study suggest quantity survey concept for column-beam structure comprised of composite precast concrete members. Hereafter, the quantity survey of Green Frame shall be much quickly and accurate, if the system would be made based on the result of this study.

  • PDF

A Basic Study on the Arrangement of In-situ Production Module of the Composite PC Members (합성 PC 부재 현장생산배치에 관한 기초 연구)

  • Lee, Goon-Jae;Joo, Jin-Kyu;Lee, Sung-Ho;Kim, Sun-Kuk
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2011.11a
    • /
    • pp.29-30
    • /
    • 2011
  • A Green Frame is a composite Rahmen precast concrete structure that utilizes the advantages of the steel frame and the reinforced concrete. Compared to bearing wall structure, the precast concrete structure may raise construction cost If the precast concrete members are produced in plant. Thus, if the precast concrete members can be produced in site, the cost-effectiveness and quality shall be increased. Various site conditions must be considered and reviewed to ensure a space for the in-situ production. Therefore, this study focuses on the basic study on the arrangement of in-situ production module of composite precast concrete members.

  • PDF

A Study on the Lifting Progress for Composite Precast Concrete Members of Green Frame (그린 프레임 합성 PC부재의 양중공정 분석 연구)

  • Joo, Jin-Kyu;Kim, Shin-Eun;Lee, Gun-Jea;Kim, Sun-Kuk;Lee, Sung-Ho
    • Korean Journal of Construction Engineering and Management
    • /
    • v.13 no.3
    • /
    • pp.34-42
    • /
    • 2012
  • Green frame technology intended to facilitate the remodeling of apartment housing complexes in Korea and extend their service life has been developed. Green frame design is a Rahmen structure using composite precast concrete members and, unlike a bearing-wall structure, lifting and installing structural members accounts for major steps of structural construction. Therefore, if green frame structure construction is to be scheduled appropriately, systematic lifting plan needs to be developed in advance. Development of lifting plan also requires unit lifting process of composite PC members (columns and beams) that consist of green frame to be analyzed first. Therefore, this study attempts to analyze the lifting process of composite PC members used in green frame structure. To that end, lifting procedure and time of composite PC column and beam are estimated and applied to a project case to analyze the lifting cycle of reference floor. Outcomes produced herein will be used as key data for development of lifting plan in subsequent green frame structure construction.

Evaluation of Flexural Behavior of Masonry Members Reinforced with Engineered Cementitious Composite (고인성 복합체로 보강한 조적부재의 휨 거동 평가)

  • Yang, Seung-Hyeon;Kim, Sun-Woong;Kim, Jae-Hwan;Kang, Suk-Pyo;Hong, Seong-Uk
    • Journal of the Korea institute for structural maintenance and inspection
    • /
    • v.25 no.4
    • /
    • pp.37-45
    • /
    • 2021
  • This paper is a basic study to evaluate the possibility of earthquake-resistant reinforcement by reinforcing engineered cementitious composite in masonry members. In order to examine the performance according to the fiber mixing rate of the engineered cementitious composite, a test specimen was prepared according to the formulation design, and flow ability, compressive strength, flexural strength, length change rate, and direct tensile strain were measured. In addition, non-reinforced masonry members, masonry members reinforced with engineered cementitious composite, and masonry members in which glass fibers and wire mesh were separately reinforced with engineered cementitious composites were manufactured, and flexural strength and maximum displacement were measured. All specimens reinforced with engineered cementitious composite showed more than 16 times the effect of maximal strength compared to that of no reinforcement, and as a result of examining the crack shape, the energy dissipation ability was excellent, confirming the possibility of seismic reinforcement.

The Characteristics of Flexure Strength and Rigidity in Light-weight CFRP Members (경량화 CFRP 부재의 휨 강도와 강성 특성)

  • Yang, In-Young;Kim, Jung-Ho;Kim, Ji-Hoon
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.25 no.11
    • /
    • pp.95-99
    • /
    • 2008
  • Applications of composite materials in various engineering fields have been extended significantly. For being useful composite materials, we could modify the rigidity and strength characteristics of composite material according to structures and material direction. In this study, CFRP, which has been widely used in space leisure and general structural applications due to the weight, elasticity coefficient, high fatigue strength and lower thermal transformation ect, was selected. As the CFRP is an anisotropic material whose mechanical properties change with its stacking sequence or angle, special attention was given to the effects of the fiber orientation angle on the bending characteristics of CFRP fiat and CFEP square members. It's different on the each result of strength and rigidity of CFRP flat and CFRP square members.

Local Buckling Behavior of Pultruded Structural Flexural Members (펄트루젼 구조용 휨부재의 국부좌굴 거동)

  • 정재호;윤순종
    • Proceedings of the Korean Society For Composite Materials Conference
    • /
    • 2003.04a
    • /
    • pp.147-151
    • /
    • 2003
  • In this study, we discussed the local buckling behavior of pultruded structural flexural members. Previous works were briefly reviewed and the local buckling behavior of orthotropic box-shape flexural members was discussed. The simplified form of equation for finding the width ratio of plate element of box-shape flexural members in which all plate components buckle simultaneously was proposed and the macro flow-chart for finding local buckling strength of pultruded flexural members was also suggested. To establish the design guide line for the local buckling of pultruded flexural members, further studies need to be performed as follows; the simplified form of solutions for finding the minimum buckling coefficient of orthotropic plate with various loading and boundary conditions including rotationally restrained boundary conditions, the simplified form of equation for calculating the coefficient of restraint provided by the adjacent plate elements.

  • PDF

Elastic Local Buckling for Orthotropic Channel Section Compression Members with Edge Stiffeners (연단보강된 직교이방성 Channel 단면 압축재의 탄성국부좌굴)

  • 최원창;정상균;윤순종
    • Proceedings of the Korean Society For Composite Materials Conference
    • /
    • 2001.10a
    • /
    • pp.91-94
    • /
    • 2001
  • This paper presents the analytical investigation pertaining to the local buckling behavior of orthotropic channel section compression members stiffened with unsymmetric stiffeners at its free edges. In the analysis, tile edge stiffener is modeled as a beam element or a plate element. The result of both cases is presented in graphical form so that the effects of edge stiffeners on the local buckling strength of edge stiffened channel section member can be found.

  • PDF

Structural performance of cold-formed steel composite beams

  • Dar, M. Adil;Subramanian, N.;Anbarasu, M.;Dar, A.R.;Lim, James B.P.
    • Steel and Composite Structures
    • /
    • v.27 no.5
    • /
    • pp.545-554
    • /
    • 2018
  • This study presents a novel method of improving the strength and stiffness of cold-formed steel (CFS) beams. Flexural members are primary members in most of the structures. Hence, there is an urgent need in the CFS industry to look beyond the conventional CFS beam sections and develop novel techniques to address the severe local buckling problems that exist in CFS flexural members. The primary objective of this study was to develop new CFS composite beam sections with improved structural performance and economy. This paper presents an experimental study conducted on different CFS composite beams with simply supported end conditions under four point loading. Material properties and geometric imperfections of the models were measured. The test strengths of the models are compared with the design strengths predicted by using Australian/New Zealand Standard for cold-formed steel structures. Furthermore, to ensure high precision testing, a special testing rig was also developed for testing of long span beams. The description of test models, testing rig features and test results are presented here. For better interpretation of results, a comparison of the test results with a hot rolled section is also presented. The test results have shown that the proposed CFS composite beams are promising both in terms of better structural performance as well as economy.

State-of-the-art of advanced inelastic analysis of steel and composite structures

  • Liew, J.Y. Richard
    • Steel and Composite Structures
    • /
    • v.1 no.3
    • /
    • pp.341-354
    • /
    • 2001
  • This paper provides a state-of-the-art review on advanced analysis models for investigating the load-displacement and ultimate load behaviour of steel and composite frames subjected to static gravity and lateral loads. Various inelastic analysis models for steel and composite members are reviewed. Composite beams under positive and negative moments are analysed using a moment-curvature relationship which captures the effects of concrete cracking and steel yielding along the members length. Beam-to-column connections are modeled using rotational spring. Building core walls are modeled using thin-walled element. Finally, the nonlinear behaviour of a complete multi-storey building frame consisting of a centre core-wall and the perimeter frames for lateral-load resistance is investigated. The performance of the total building system is evaluated in term of its serviceability and ultimate limit states.

Development of a Composite Revenue Sharing-Quantity Flexibility Contract

  • Lumsakul, Pasuree;Luong, Huynh Trung
    • Industrial Engineering and Management Systems
    • /
    • v.12 no.3
    • /
    • pp.224-233
    • /
    • 2013
  • In supply chain management, the supply contract can induce collaboration and coordination among the supply chain members in order to optimize supply chain performance. Numerous supply contracts have been examined; however, some difficulties related to the application of these contracts still occur. One of the solutions is to apply the composite supply contract which can assist in the supply chain coordination. This research examines the composite contract of the revenue sharing and quantity flexibility contracts in a two-stage supply chain, which comprises a retailer and a supplier. In this research, a mathematical model of the composite contract is developed; then, the applicability of the proposed composite contract is examined by investigating its capability in terms of supply chain coordination and profit allocation. In the numerical experiments, the composite revenue sharing-quantity flexibility contract showed that it is superior to both component contracts in terms of supply chain coordination and profit allocation among supply chain members.