Abstract: The effects of secondary torsion on shear strength of biaxial flexural reinforced concrete beams are analyzed. A gradual loading scheme with pending-coefficients is introduced to calculate the secondary torsion of biaxial flexural reinforced concrete beams. Comparison and analysis of calculation results and test results show that the present method is feasible. Some valuable conclusions are reached. It is shown that secondary torsion should be considered while calculating the shear strength of reinforced concrete beams with web reinforcement under biaxial concentrated loads.