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In order to evaluate the behavior of reinforced concrete columns with rectangular hollow section subjected to axial compression and biaxial bending, the calculation formula of load capacity and moment-curvature relationship are derived according to the distribution type of neutral axis in this paper. The load capacity and rotation ductility of the bottom control section of three reinforced concrete specimen bridge columns with rectangular hollow section under different axial compression ratio,doi:10.3846/bjrbe.2016.06 fatcat:sib6lf7ydbcl7dln5ikuj5e35m