• Title/Summary/Keyword: stub column tests

Search Result 31, Processing Time 0.025 seconds

Tests for Moment Redistribution in Flat Plates with Different Reinforcement Details according to End and Midspan Moment Distributions (단부 및 중앙부 플랫플레이트의 철근 분배율에 따른 모멘트 재분배 실험)

  • Choi, Jung-Wook;Song, Jin-Kyu
    • Journal of the Korea Concrete Institute
    • /
    • v.19 no.5
    • /
    • pp.603-611
    • /
    • 2007
  • Three interior slab-column connections designed by equal static moments and by different distribution of end and midspan moments were tested. Each test specimen consists of a 4.2 m square slab and a 355 mm square column stub. The slab thickness is 152 mm. Test results showed not only that flat plate systems can undergo considerable redistribution of moments from the uncracked state to final maximum capacity, but also that the distribution of moments is controlled largely by the distribution of reinforcement adopted by the designer. Tests also indicated that the punching shear strength of slabs can be affected by the redistributed moments.

Strength of Axially Loaded Concrete-Filled Tubular Stub Column. (중심축하중을 받는 콘크리트충전 각형강관단주의 내력)

  • Kang, Chang-Hoon;Oh, Young-Suk;Moon, Tae-Sup
    • Journal of Korean Society of Steel Construction
    • /
    • v.13 no.3
    • /
    • pp.279-287
    • /
    • 2001
  • This paper presents an experimental and analytical study on the behavior of concrete-filled tubular stub columns concentrically loaded in compression to fail. Total eleven specimens were tested and test parameters are the depth-to-thickness ratios of steel tube and the ratio of concrete cylinder strength-to-yield stress of steel tube. Depth-to-thickness ratios of steel tube between 20.22

  • PDF

Behaviour of cold-formed steel concrete infilled RHS connections and frames

  • Angeline Prabhavathy, R.;Samuel Knight, G.M.
    • Steel and Composite Structures
    • /
    • v.6 no.1
    • /
    • pp.71-85
    • /
    • 2006
  • This paper presents the results of a series of tests carried out on cold-formed steel rectangular hollow and concrete infilled beam to column connections and frames. A stub column was chosen such that overall buckling does not influence the connection behaviour. The beam chosen was a short-span cantilever with a concentrated load applied at the free end. The beam was connected to the columns along the strong and weak axes of columns and these connections were tested to failure. Twelve experiments were conducted on cold-formed steel direct welded tubular beam to column connections and twelve experiments on connections with concrete infilled column subjected to monotonic loading. In all the experiments conducted, the stiffness of the connection, the ductility characteristics and the moment rotation behaviour were studied. The dominant mode of failure in hollow section connections was chord face yielding and not weld failure. Provision of concrete infill increases the stiffness and the ultimate moment carrying capacity substantially, irrespective of the axis of loading of the column. Weld failure and bearing failure due to transverse compression occurred in connections with concrete infilled columns. Six single-bay two storied frames both with and without concrete infill, and columns loaded along the major and minor axes were tested to failure. Concentrated load was applied at the midspan of first floor beam. The change in behaviour of the frame due to provision of infill in the column and in the entire frame was compared with hollow frames. Failure of the weld at the junction of the beam occurred for frames with infilled columns. Design expressions are suggested for the yielding of the column face in hollow sections and bearing failure in infilled columns which closely predicted the experimental failure loads.

A Study on the Characteristics of SM570TMC Plates in Compression Members (SM570TMC 강재의 압축재 특성에 관한 연구)

  • Im, Sung Woo;Kim, Yo Suk;Chang, In Hwa
    • Journal of Korean Society of Steel Construction
    • /
    • v.17 no.3 s.76
    • /
    • pp.357-363
    • /
    • 2005
  • There is a great need for high-strength steel especially for the high-rise steel building structure. High-strength steels, however, may have mechanical properties that are significantly different from those of the conventional steels. The application of high-strength steels to building structures should be reviewed as to whether the inelastic behavior equivalent to that of conventional steels can be attained or not. In this study, SM570TMC steel was tested to evaluate buckling strength under axial compressive force. The comparison tests for local buckling strength evaluation of box-type and H-shaped welded columns were performed with variable width-thickness ratios. As for the experimental check, the maximum strength of stub column was determined by local buckling as far as the limit of width-to-thickness ratio was satisfied with current design codes. Also, the strength of the stub column did not decrease suddenly by local buckling before maximum strength even when the ratio is not satisfied. The buckling strength of SM570TMC steel was higher than both ASD (Allowable Stress Design) and LRFD (Load and Resistance Factor Design) specifications.

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.

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.

Evaluation on Applicability of Built-up Square Tubular Compression Members Fabricated with HSA800 High Performance Steel Considering Local Buckling (국부좌굴을 고려한 건축구조용 고성능강(HSA800) 조립각형강관 압축재의 적용성 평가)

  • Yoo, Jung Han;Kim, Joo Woo;Yang, Jae Guen;Kang, Joo Won;Lee, Dong Woo
    • Journal of Korean Society of Steel Construction
    • /
    • v.25 no.3
    • /
    • pp.223-231
    • /
    • 2013
  • Recently, high-performance steels have been increasingly used for structural materials in buildings and bridges with the demand for high-rise and long-span of main structures. This paper offers a series of basic study for the design specification of structural members using high performance steel, that is material properties of HSA800 (High-performance rolled steel for building structures). Built-up square tube stub columns with variables of width-to-thickness ratios are planned as a parametric study in order to investigate the local buckling behaviors and check the current design limit of width-to-thickness ratio. In addition, the buckling behaviors of stub columns obtained finite element (FE) analysis were compared with those from experimental tests. The verified FE model was used for parametric study and checked applicability of high-strength steel on current design specification.

A Comparison Study on Strength of Stainless Steel Tube and Steel Tube Stub-columns (스테인리스강관과 일반구조용강관 단주내력 비교에 관한 연구)

  • Jang, Ho Ju;Yu, Jea Hee;Yang, Young Sung
    • Journal of Korean Society of Steel Construction
    • /
    • v.15 no.5 s.66
    • /
    • pp.561-570
    • /
    • 2003
  • This study evaluate the characteristics of stainless steel for the use of stainless steel tubes as structural members. The strength of stainless steel tube was compared with that of steel tube stub-columns through tensile experiment and compressed experiment. The selected experimental parameters were diameter (width)-thickness and section shape. The results of tests showed that stainless steel tubes could be predicted as superior to steel tubes in terms of tensile strength, yield ratio, elongation percentage, and absorption ability of energy. The yield strength of stainless steel tubes were found to be higher than the Korean Standards ($Fy=2.1tf/cm^2$) and the design strength of SIJ-ASD($Fy=2.4tf/cm^2$). It was also higher then the yield strength of steel tubes. The plastic deformation of stainless steel tubes was found to beto that of steel tubes.

The Evaluation of the Axial Strength of Composite Column with HSA800 Grade Steel (HSA800 강재를 적용한 합성기둥의 축방향 내력 평가)

  • Lee, Myung Jae;Kim, Cheol Hwan;Kim, Hee Dong
    • Journal of Korean Society of Steel Construction
    • /
    • v.26 no.5
    • /
    • pp.473-483
    • /
    • 2014
  • According to the Korean Building Code (KBC), the validity of the application of 800MPa grade steel(HSA800) to composite column should be verified by experimental or analytical method. Thus, stub column tests for encased and filled composite members with HSA800 steel were conducted, and axial strength and the validity of design compressive strength equations in KBC were evaluated. The test results show that the equation of the compressive strength of encased composite column member in KBC should be modified in order to use HSA800 steel without any reduction of specified minimum yield strength. For this purpose, it is suggested that the interval of hoop should be narrowed and the effective concrete area should be used. The equation of the compressive strength of filled composite column member in KBC is applicable to filled composite column with HSA800 steel without any modification.

Analysis of end-plate connections at elevated temperatures

  • Lin, Shuyuan;Huang, Zhaohui;Fan, Mizi
    • Steel and Composite Structures
    • /
    • v.15 no.1
    • /
    • pp.81-101
    • /
    • 2013
  • In this paper a robust 2-noded connection element has been developed for modelling the bolted end-plate connection between steel beam and column at elevated temperatures. The numerical procedure described is based on the model proposed by Huang (2011), incorporating additional developments to more precisely determinate the tension, compression and bending moment capacities of end-plate connection in fire. The proper failure criteria are proposed to calculate the tension capacity for each individual bolt row. In this new model the connection failure due to bending, axial tension, compression and shear are considered. The influence of the axial force of the connected beam on the connection is also taken into account. This new model has the advantages of both the simple and component-based models. In order to validate the model a total of 22 tests are used. It is evident that this new connection model has ability to accurately predict the behaviour of the end-plate connection at elevated temperatures, and can be used to represent the end-plate connections in supporting performance-based fire resistance design of steel-framed composite buildings.