• Title/Summary/Keyword: High-strength steel(HSA800)

Search Result 20, Processing Time 0.019 seconds

Evaluation of Applicability on a High-rise Building for the Effective Usage of High Performance Steel for Building Structures (건축구조용 고성능 강재 HSA800의 효율적 사용을 위한 초고층 건물의 적용성 평가)

  • Kim, Do Hwan;Kim, Joo Woo;Lee, Dong Woo;Yang, Jae Guen;Lee, Myung Jae
    • Journal of Korean Society of Steel Construction
    • /
    • v.26 no.5
    • /
    • pp.463-471
    • /
    • 2014
  • As building height and span is getting taller and longer, the researches to increase material's strength and serviceability are continuously performed. This study evaluated mechanical and chemical properties of newly developed high-strength steel (HSS) for building structures, namely HSA800 and verified cost-effectiveness and applicability of HSS for a tall building by comparing the analysis results of normal strength steel (SM490) model. HSA800 was manufactured by TMCP to have a good weldability in spite of HSS and satisfied Korean Industrial Standards (KS). The analysis results for evaluating cost-effectiveness show that total steel quantity could be saved approximately 30% when using HSS compared to SM490. It is expected that HSA800 will contribute to enhance constructability of building.

Application Study of High-Strength Steel(HSA800) for the Special Structure (특수구조 대상으로 고강도 강재(HSA800)의 현장 적용성 연구)

  • Kim, In-Ho;Lee, Hee-Su;Park, Sung-Yong;Kim, Jong-Soo
    • Journal of Korean Association for Spatial Structures
    • /
    • v.14 no.2
    • /
    • pp.69-78
    • /
    • 2014
  • The purpose of this study is to increase applicability of high strength steel, HSA800 to the structure. Selected study of structure is to consider high strength steel, and following parts, 1) Tensile member with no consider of buckling, 2) Truss existing both tension and compression members with small slenderness ratio. This studied structure is included tension column hang on to the upper bridge truss. The structure element quantity with apply HSA800 instead of SM570 is reduced about 38.9% of tension column and 29.7% of bridge truss. In addition, the number of element's division is reduced about two sections due to reduction of self weight that the crane is able to lift up. This improves to reduce erection sequence and construction period which can save about a month. All connections are reviewed as welding and bolt. Also, the cost of welding is reduced about 41.3% due to apply HSA800. In conclusion, applying HSA800 to the hanging structure aggressively can secure economic and constructability.

Buckling Strength of Concentrically Loaded High-Strength Steel Columns with Intermediate Slenderness (중심압축을 받는 고강도강 중간주의 좌굴강도 평가)

  • Kim, Dae Kyung;Lee, Cheol Ho;Han, Kyu Hong;Kim, Jin Ho;Lee, Seung Eun;Kim, Jin Won
    • Journal of Korean Society of Steel Construction
    • /
    • v.27 no.4
    • /
    • pp.377-386
    • /
    • 2015
  • In this study, inelastic buckling strength of HSA800 steel columns were tested to investigate the applicability of current column curve (KBC2009, 2010 AISC-LRFD) to HSA800 steel. Key test variables included width-thickness ratio, plate-edge restraints, and column slenderness ratio. Specimens made of ordinary steel (SM490) were also tested for comparison purposes. All the concentrically loaded HSA800 specimens exhibited sufficient buckling strength compared to the current column curve, but some of SM490 specimens showed understrength. This difference can be explained by the lower residual stress present in HSA800 specimens.

Structural Performance of 800 MPa High-Strength Steel Members and Application to Highrise and Mega Building Structures

  • Lee, Cheol-Ho
    • International Journal of High-Rise Buildings
    • /
    • v.6 no.3
    • /
    • pp.249-259
    • /
    • 2017
  • The use of high-strength steels in construction of highrise and mega building structures can bring about many technological advantages from fabrication to erection. However, key design criteria such as local and lateral stability in current steel design specifications were developed based on tests of ordinary steels which have stress-strain characteristics very different from that of high strength steels. A series of tests on 800 MPa tensile strength steel (HSA800) members are summarized in this paper which were conducted to investigate the appropriateness of extrapolating current ordinary-steel based design criteria to high strength steels. 800 MPa I-shape beam specimens designed according to flange local buckling (FLB) criteria of the AISC Specification developed a sufficient strength for elastic design and a marginal rotation capacity for plastic design. It is shown that, without introducing distinct and significant yield plateau to the stress-strain property of high-strength steel, it is inherently difficult to achieve a high rotation capacity even if all the current stability limits are met. 800 MPa I-shape beam specimens with both low and high warping rigidity exhibited sufficient lateral torsional buckling (LTB) strength. HSA800 short-column specimens with various edge restraint exhibited sufficient local buckling strength under uniform compression and generally outperformed ordinary steel specimens. The experimental P-M strength was much higher than the AISC nominal P-M strength. The measured residual stresses indicated that the impact of residual stress on inelastic buckling of high-strength steel is less. Cyclic seismic test results showed that HSA800 members have the potential to be used as non-ductile members or members with limited ductility demand in seismic load resisting systems. Finally, recent applications of 800 MPa high strength steel to highrise and mega building structures in Korea are briefly presented.

An Experimental Study on the Structural Behavior of Stub Columns with HSA800 High-strength Steels under Eccentric Loads (편심하중을 받는 건축구조용 고강도 강재(HSA800) 단주의 거동에 관한 실험적 연구)

  • Lee, Kangmin;Lee, Myung Jae;Oh, Young Suk;Oh, Keunyeong;Hong, Sungbin
    • Journal of Korean Society of Steel Construction
    • /
    • v.26 no.4
    • /
    • pp.289-297
    • /
    • 2014
  • Recently, high performance steels have been utilized to structural materials in buildings and bridges with the demand for high-rise and long-span of main structures. In this paper, flexure-compression members with the high-strength steel were experimentally evaluated to satisfy the design criteria when stub columns fabricated with HSA800 steel were eccentrically loaded. This test was conducted on box-shaped and H-shaped steels stub columns with high-strength steel to verify the P-M interaction of members subjected to combined forces according to axial load ratios. The results showed that all specimens were satisfied the requirements of Korean Building Code(KBC2009) for using of structural members.

A Study on Compressive Strength of Built-up H Shaped Columns Fabricated with HSA800 High Performance Steels (건축구조용 고성능강(HSA800) 용접 H형단면 기둥의 압축강도에 관한 연구)

  • Kim, Tae Soo;Lee, Myung Jae;Oh, Young Suk;Lee, Kang Min;Kim, Do Hwan
    • Journal of Korean Society of Steel Construction
    • /
    • v.24 no.6
    • /
    • pp.627-636
    • /
    • 2012
  • Recently, high performance(strength) steels have been utilized to structural materials in buildings and bridges with the demand for high-rise and long-span of main structures. This paper is a series of basic study for the design specification of structural members using high performance steel, material properties of high performance rolled steel building structures; material properties of HSA800 steel was compared with the requirements of Korean Standards(KS) for HSA800. Welded H-shape stub columns with variables of width-to-thickness ratios are planned in order to investigate the local buckling behaviors and check the current design limit of width-to-thickness ratio and uniaxial compressive tests are carried out. In addition, the buckling behaviors of stub columns obtained finite element analysis were compared with those of test results.

Local Buckling and Inelastic Behaviour of 800 MPa High-Strength Steel Beams (800MPa급 고강도강 보 부재의 국부좌굴 및 비탄성 거동)

  • Lee, Cheol-Ho;Han, Kyu-Hong;Kim, Dae-Kyung;Park, Chang-Hee;Kim, Jin-Ho;Lee, Seung-Eun;Ha, Tae-Hyu
    • Journal of Korean Society of Steel Construction
    • /
    • v.24 no.4
    • /
    • pp.479-490
    • /
    • 2012
  • Flexural tests on full-scale H-shaped beams, built up from high-strength steels (HSB800 and HSA800) with a nominal tensile strength of 800 MPa, was carried out to study the effect of flange slenderness of high-strength steel on flexural strength and rotation capacity. The primary objective was to investigate the appropriateness of extrapolating current stability criteria (originally developed for ordinary steel) to high-strength steel. The performance of high-strength steel specimens was very satisfactory from the strength, but not from the rotation capacity, perspective. The inferior rotation capacity of high-strength steel beams was shown to be directly attributable to the absence of a distinct yield plateau and the high yield ratio of the material. Residual stress measurements reconfirmed that the magnitude of the residual stress is almost independent of the yield stress of the base metal.

Flexural Tensile Strength of CJP Groove Welded Joints Connecting Thick HSA800 Plates (HSA800 후판재의 완전용입 맞댐용접부 휨-인장강도 실험)

  • Lee, Cheol Ho;Kim, Dae Kyung;Han, Kyu Hong;Park, Chang Hee;Kim, Jin Ho;Lee, Seung Eun;Kim, Do Hwan
    • Journal of Korean Society of Steel Construction
    • /
    • v.26 no.5
    • /
    • pp.407-418
    • /
    • 2014
  • As a continuing work of previously conducted standard tension tests, full-scale flexural tests were conducted in this study to assess the structural performance the CJP groove welded joints connecting thick HSA800 plates. Two welding electrodes were available at the time of this experimental research; one was GMAW-based electrode A and the other FCAW-based electrode B. Three full-scale box-type beam specimens with single bevel- and V-groove CJP welded joints were fabricated from 60mm and 25mm thick HSA800 plates according to the AWS-prequalified groove welded joint details. In designing the specimens, all possible limit states like local and lateral torsional buckling were carefully controlled in order to induce flexural plastic yielding or eventual joint fracture. All the CJP joints made by both welding electrodes showed satisfactory performance and were able to transfer the tensile flange forces higher than that corresponding to the measured tensile strength of HSA800 flange plates. However, it should be noted that, during fabrication, serious concerns about the welding efficiency and workability of the GMAW-based electrode were raised by a certified welder. The fracture occurred at the unbeveled (or vertical) interface between the weldment and the base metal when the GMAW-based electrode was used in the single-bevel joint, implying the possibility of insufficient melting. Thus, the FCAW-based electrode B is again recommended as the choice of welding electrode for HSA800 plates. The limited test data of this study implies that the V-groove CJP joint should be used in favor of the single bevel CJP joint, if possible.

Compressive Strength and Residual Stress Evaluation of Stub Columns Fabricated of High Strength Steel (고강도강재 단주의 압축강도 및 잔류응력 평가)

  • Lee, Cheol-Ho;Kim, Dae-Kyung;Han, Kyu-Hong;Kim, Jin-Ho;Lee, Seung-Eun;Ha, Tae-Hyu
    • Journal of Korean Society of Steel Construction
    • /
    • v.24 no.1
    • /
    • pp.23-34
    • /
    • 2012
  • In this study, stub columns subjected to concentrical and eccentrical loads were tested to check the applicability of the current local stability criteria (KBC2009, AISC2005) to 800MPa high-strength steel (HSA800). The key test variables in the concentrically loaded tests included the plate-edge restraints and the width-to-thickness ratio normalized by the yield strength of steel. Specimens made of ordinary steel (SM490) were also tested for comparative purposes. Eccentrically loaded stub column tests were conducted for a range of the P-M combinations by controlling the loading eccentricity. All the concentrically loaded specimens with non-compact and slender sections developed sufficient strengths according to the current local stability criteria. All the eccentrically loaded specimens with non-compact H sections also exhibited a sufficient P-M interaction strength that was even higher than that of compact H- section counterparts. Residual stresses were also measured by using the non-destructive indentation method to demonstrate their dependency or independency on the steel material's yield strength. The measured results of this study also indicated that the magnitude of residual stresses bears no strong relation to the yield strength of the steel material.

Local Buckling of Built-up Square Tubular Compression Members Fabricated with HSA800 High Performance Steels under Concentric Axial Loading (중심압축력을 받는 건축구조용 고성능강(HSA800) 용접 각형강관 압축재의 국부좌굴)

  • Yoo, Jung-Han;Kim, Joo-Woo;Yang, Jae-Keun;Kang, Joo-Won;Lee, Dong-Woo
    • Journal of Korean Society of Steel Construction
    • /
    • v.24 no.4
    • /
    • pp.435-442
    • /
    • 2012
  • Recently, high performance(strength) steels have been utilized to structural materials in buildings and bridges with the demand for high-rise and long-span of main structures. This paper is a series of basic study for the design specification of structural members using high performance steel, material properties of high performance rolled steel building structures. HSA800 was compared with the requirements of Korean Standards(KS) for HSA800. Welded square tube stub columns with variables of width-to-thickness ratios are planned in order to investigate the local buckling behaviors and check the current design limit of width-to-thickness ratio and uniaxial compressive tests are carried out. In addition, the local buckling behaviors of stub columns obtained finite element analysis were compared with those of test results.