Steel and Composite Structures

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Experimental investigation on strength of CFRST composite truss girder

  • Yinping Ma (School of Civil Engineering, Chongqing University) ;
  • Yongjian Liu (School of Civil Engineering, Chongqing University) ;
  • Kun Wang (School of Highway, Chang'an University)
  • Received : 2022.12.23
  • Accepted : 2023.09.13
  • Published : 2023.09.25
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Abstract

Concrete filled rectangular steel tubular (CFRST) composite truss girder is composed of the CFRST truss and concrete slab. The failure mechanism of the girder was different under bending and shear failure modes. The bending and shear strength of the girder were investigated experimentally. The influences of composite effect and shear to span ratio on failure modes of the girder was studied. Results indicated that the top chord and the joint of the truss were strengthened by the composited effect. The failure modes of the specimens were changed from the joint on top chord to the bottom chord. However, the composite effect had limited effect on the failure modes of the girder with small shear to span ratio. The concrete slab and top chord can be regarded as the composite top chord. In this case, the axial force distribution of the girder was close to the pin-jointed truss model. An approach of strength prediction was proposed which can take the composite effect and shear to span ratio into account. The approach gave accurate predictions on the strength of CFRST composite truss girder under different bending and shear failure modes.

Keywords

Acknowledgement

This study was funded by the Supported by the Fundamental Research Funds for the Central Universities, CHD (No. 300102213516) and Natural Science Foundation of China (No. 51378068), which are gratefully acknowledged.

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