MAO Dejun,QIAN Yongjiu,SONG Shuai.Theoretical Research on Bearing Capacity of Moderate to Long Reinforced Concrete Columns under Axial Compression and Strengthened by Jacketing[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(01):32-38.
MAO Dejun,QIAN Yongjiu,SONG Shuai.Theoretical Research on Bearing Capacity of Moderate to Long Reinforced Concrete Columns under Axial Compression and Strengthened by Jacketing[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(01):32-38. DOI: 10.13409/j.cnki.jdpme.2021.01.004.
Theoretical Research on Bearing Capacity of Moderate to Long Reinforced Concrete Columns under Axial Compression and Strengthened by Jacketing
In order to investigate the theoretical computational analysis method of axial compression bearing capacity of moderate to long reinforced concrete (RC) columns strengthened by jacketing, the elastic-plastic stability and bearing capacity calculation method was derived based on the tangent modulus theory, the material constitutive relation, and the equilibrium conditions for internal and external forces. , The theoretical calculation results were compared with the test results. The results show that the theoretical calculation value is smaller than the measured value, and the deviation between them is within 15%. According to the derived computational analysis method, the effect of four parameters on the bearing capacity Nu of the strengthened column were investigated, including the initial load level
β
of the core column, column slenderness ratio
l
0
/
b
, concrete strength of the hoop layer, and quantity of reinforcement in the hoop layer. The results show that
N
u
generally decreases with the increase of
β
. When
β
<
0.7, the decreasing trend is not obvious enough. If
β
>
0.7, the decreasing trend becomes apparent. The effect of
l
0
/
b
on Nu is obvious, and
N
u
decreases nonlinearly with the increase of
l
0
/
b
. Nu increases with the increase of hoop layer concrete strength.
N
u
also increases with increased quantity of reinforcement in the hoop layer.
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