• Title, Summary, Keyword: high-strength structural steel

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Shear Behavior of High-Strength Steel Reinforced Concrete Beams without Stirrups (고장력 주인장 철근을 사용한 전단보강이 없는 보의 전단성능에 관한 연구)

  • Shon, Young-Moo;Yoon, Young-Soo
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.6 no.2
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    • pp.203-210
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    • 2002
  • In these days, High-strength steel prevails throughout the construction fields for the benefit of structural and economical aspects. But high-strength steel is used by the simple calculation of flexural capacities for the purpose of reducing flexural reinforcement. So, this paper is mainly focused on the shear behavior of high-strength steel reinforced concrete beams without stirrups comparing with normal-strength steel reinforced concrete beams. Specimens were made and tested with the experimental parameters, such as steel yield strength, reinforcement ratios and minimum shear reinforcement. The main result was that not only area but also the yield strength of flexural reinforcement should be considered to predict the shear capacities of concrete beams. In addition, the experimental results were simulated by modified compression field theory analysis program, RESPONSE 2000. A good agreement was achieved between the test results and program analyses.

Direct strength method for high strength steel welded section columns

  • Choi, Jong Yoon;Kwon, Young Bong
    • Steel and Composite Structures
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    • v.29 no.4
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    • pp.509-526
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    • 2018
  • The direct strength method adopted by the AISI Standard and AS/NZS 4600 is an advanced design method meant to substitute the effective width method for the design of cold-formed steel structural members accounting for local instability of thin plate elements. It was proven that the design strength formula for the direct strength method could predict the ultimate strength of medium strength steel welded section compressive and flexural members with local buckling reasonably. This paper focuses on the modification of the direct strength formula for the application to high strength and high performance steel welded section columns which have the nominal yield stress higher than 460 MPa and undergo local buckling, overall buckling or their interaction. The resistance of high strength steel welded H and Box section columns calculated by the proposed direct strength formulae were validated by comparison with various compression test results, FE results, and predictions by existing specifications.

A fracture criterion for high-strength steel structural members containing notch-shape defects

  • Toribio, J.;Ayaso, F.J.
    • Steel and Composite Structures
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    • v.3 no.4
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    • pp.231-242
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    • 2003
  • This paper deals with the formulation and development of fracture criteria for high-strength structural members containing surface damage in the form of notches (i.e., blunt defects). The important role of the yield strength of the material and its strain hardening capacity (evaluated by means of the constitutive law or stress-strain curve) is analysed in depth by considering the fracture performance of notched samples taken from high-strength steels with different levels of cold drawing (the most heavily drawn steel being commercial prestressing steel used in prestressed concrete). The final aim of the paper is to establish fracture-based design criteria for structural members made of steels with distinct yield strength and containing very different kinds of notch-shape surface damage.

Economic Evaluation of High-Strength Steel for Structural Member Types in Building Structures (부재 종류에 따른 고강도 강재의 경제성 평가)

  • Kim, In Ho;Cho, So Hoon;Kim, Jong Ho;Lee, Chul Woo
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.26 no.2
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    • pp.113-121
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    • 2013
  • The structural steel produced in domestic is classified into 5 grades. For economic structural design, the structural engineers need to choose optimal steel grades for structural member types, but the related data is not sufficient. Recently, high strength steel with yield strength in 650MPa was developed in domestic. It provides structural engineers with the wider range of structural steel strength, which leads to the larger difference in economic evaluation. In this paper, the economic evaluation of high-strength steel in building structures is investigated, by applying structural steel with 235MPa, 325MPa and 650MPa in yield strength to various types of structural members, and can be used as basic data for economic structural design.

Structural Cost Optimization for Building Frame System Using High-Strength Steel Members (고강도 강재를 사용한 건물골조방식 구조물의 구조비용 최적화)

  • Choi Sang-Hyun;Kwon Bong-Keun;Kim Sang-Bum;Seo Ji-Hyun;Kwon Yun-Han;Park Hyo-Seon
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • pp.541-548
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    • 2006
  • This study presents a structural cost optimization method for building frame system using high-strength steel members. In, this optimization method, the material cost of steel member is involved in objective function to find the optimal cost of building frame systems. Genetic Algorithm is adopted to optimizer to find structural cost optimization. The proposed adapted to structural design of 3.5 stories example buildings with buildings frame systems. As a result, The proposed optimization method can be effectively adapted to cost optimization of building frame systems using high-strength steel members.

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Structural Performance of Steel Pipe Splice for SD500 High-strength Reinforcing Bar under Cyclic Loading

  • Kim, Hyong-Kee
    • Architectural research
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    • v.10 no.1
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    • pp.13-23
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    • 2008
  • It is the purpose of this study to evaluate the structural performance of steel pipe splice for SD500 high-strength reinforcing bar, through a cyclic loading test. The experimental variables adopted in this study include the development length of rebar, the type of sleeve, and size of reinforcing bar, among others. The results of this study showed that the developed steel pipe splice system for SD500 high-strength reinforcing bar, retained the structural performance required in domestic, ACI and AIJ code. It is considered that the study result presented in this paper can be helpful in developing a reasonable design method for a steel pipe splice system for SD500 high-strength reinforcing bar.

Developments and applications of high strength cold rolled steel sheets for automobiles (자동차용 고강도 냉연강판의 개발 및 적용현황)

  • Kim S. J.;Chin K. G.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.45-52
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    • 2004
  • Continuing pressure for the weight reduction of vehicles and improvement of collision safety is driving the development of new high strength steel with excellent formability. The formable high strength steels which have excellent drawability have been developed and applied to the complicated inner panels. Although BH steel have mainly occupied the material market for outer panels, it is challenged by DP steel which have low yield strength and good bake hardenability. The advanced high strength steel, TRIP steels and DP steels which have excellent formability are new alternatives to conventional HSLA steel for structural parts such as members and pillars. HSLA steels also have been used for automotive bumper reinforcements due to their high yield ratio. Higher grade complex phase steel(CP) were developed for bumper reinforcements by addition of precipitation hardening to transformation strengthened steel. The usage of the advanced high strength steel ale increasing and will become the main material in structural parts near future. This paper describes the features of newly developed high strength cold rolled steels for automobiles.

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Structural coupling mechanism of high strength steel and mild steel under multiaxial cyclic loading

  • Javidan, Fatemeh;Heidarpour, Amin;Zhao, Xiao-Ling;Al-Mahaidi, Riadh
    • Steel and Composite Structures
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    • v.27 no.2
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    • pp.229-242
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    • 2018
  • High strength steel is widely used in industrial applications to improve the load-bearing capacity and reduce the overall weight and cost. To take advantage of the benefits of this type of steel in construction, an innovative hybrid fabricated member consisting of high strength steel tubes welded to mild steel plates has recently been developed. Component-scale uniaxial and multiaxial cyclic experiments have been conducted with simultaneous constant or varying axial compression loads using a multi-axial substructure testing facility. The structural interaction of high strength steel tubes with mild steel plates is investigated in terms of member capacity, strength and stiffness deterioration and the development of plastic hinges. The deterioration parameters of hybrid specimens are calibrated and compared against those of conventional steel specimens. Effect of varying axial force and loading direction on the hysteretic deterioration model, failure modes and axial shortening is also studied. Plate and tube elements in hybrid members interact such that the high strength steel is kept within its ultimate strain range to prevent sudden fracture due to its low ultimate to yield strain ratio while the ductile performance of plate governs the global failure mechanism. High strength material also significantly reduces the axial shortening in columns which prevents undesirable frame deformations.

Structural Optimization of High-rise Buildings using High-strength Steels (고강도강재의 효율적 사용을 위한 초고층건물의 최적설계기법)

  • Seo, Ji-Hyun;Kwon, Bong-Keun;Kim, Sang-Bum;Park, Hyo-Seon
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.22 no.3
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    • pp.277-287
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    • 2009
  • Recently, the high-strength steel of 400~600MPa tensile strength is producing in the country. Use of high-strength steel member in the design of high-rise buildings is expected to increase the efficiency of structural design in the aspect of structure material weight and cost, however it has been used only a narrow extent. No efficient design method to use high-strength steel in the design of high-rise buildings has been developed. Therefore, in this study structural cost optimization technique that can minimize the structural material cost of high-rise buildings using high-strength steels is developed. The efficiency of the technique is evaluated by comparing the experience-based design for 6 high-rise building examples. As a result, the proposed techniques can save 7~21% of structural material cost compared with experienced-based design. And also, the rough guideline for effective use of high-strength steels in the structural design of high-rise buildings is introduced on the basis of results.

A Study on Deformation Capacity of High Strength Steel Beam-to-Column Connections According to Welding Detail at Beam End (보 단부 용접상세에 따른 고강도강 기둥-보 접합부의 변형능력에 관한 연구)

  • Oh, Sang Hoon;Park, Hae Yong
    • Journal of Korean Society of Steel Construction
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    • v.26 no.4
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    • pp.335-348
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    • 2014
  • For high-strength steel, it is difficult to be applied to flexible structural member because it have high yield ratio and low basic material's toughness. One of the great problems when using high-strength steel connections is the brittle fracture at the end of the beam member in common with general mild steel connections. In the cases of mild steel connections, it has be developed that special moment frame connection details by reinforcing structural member or improvement of welding access hole. But, it is incomplete at yet about applicability estimation of high-strength steel connections. This study is the initial step research for the applicability estimation of beam-to-column connections being applied to developed high-strength steel, HSA800. And, it studied about structural performance of the high-strength steel connections according to the details of welding access hole through full-scale test and analytical method.