Study on the Mechanical Properties and Bearing Capacity of Ultra-High Performance Concrete Members
DOI:
https://doi.org/10.13052/ejcm2642-2085.3344Keywords:
Corrugated concrete filled with steel tube, Pure shear, Shear bearing capacity, Curved shear correlation, Bearing capacityAbstract
It is used as pier column members in viaducts, urban overpasses and industrial and civil building structures. In practical engineering, short columns or ultra-short columns with relatively small shear span may be formed, and shear failure may become the control condition for components and even structural damage. Under the action of large concentrated load or strong earthquake, the key parts of the high-rise structure and beam bridge system are obviously shear, leading to the serious brittleness and poor ductility of the components, which leads to serious structural continuity collapse, and then brings the loss of life and property. Therefore, it is important to study the shear properties of corrugated concrete members and to study the mechanical properties of components under complex load coupling. TRC comparison, 10 mm incision 100 mm from both ends. The specimen is equipped with 8 HRB400 longitudinal bars of 12 mm diameter along the length direction, the center of the longitudinal bars is 105 mm from the center of the specimen, and the steel content is 1.84%; the longitudinal bars with HPB300 stirrup of 100 along the axial direction, and the steel content of the stirrups is 0.68%. The results show that because the corrugated steel pipe can provide sufficient constraint for the internal core concrete and steel, the corrugated CFCT members have better ductility than the constrained concrete members under the small shear span ratio, which can effectively delay the occurrence of brittle shear failure. The curved shear test study of 12 corrugated concrete filled steel tube specimens was carried out, and the test phenomenon and failure mode of the components under different shear span ratio conditions were compared and analyzed. The study shows that when the shear span ratio is not greater than 0.2, the specimen shear error is obvious, mainly shear failure; when the shear span ratio is between 0.2 and 2.0, the specimen bending shear failure. With the increase of the shear span ratio, the specimen failure form is closer to the bending failure.
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