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Steel and Composite Structures Volume 48, Number 6, September 25 2023 , pages 667-679 DOI: https://doi.org/10.12989/scs.2023.48.6.667 |
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Experimental investigation on strength of CFRST composite truss girder |
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Yinping Ma, Yongjian Liu and Kun Wang
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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 pinjointed 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. | ||
| Key Words | ||
| composite effect; composite truss girder; Concrete Filled Rectangular Steel Tube (CFRST); experiment; strength prediction | ||
| Address | ||
| Yinping Ma and Yongjian Liu:School of Civil Engineering, Chongqing University, Chongqing, 400045, China Kun Wang:School of Highway, Chang'an University, Xi'an, 710064, China | ||