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The large defbrmation ／ post − peak behavior analysis method of concrete beams and columns considering bond − slip of reinforcement is developed． The analytical procedure is capable of predicting the response of concrete beams and columns under axial f ( )rce and biaxial bending in the material and geometrical nonlinear domains ， including post − peak behavior using the incremental arch length method ． The paper gives an outline of the nonlinear analysis method which includes the e 仔ect of bond − slip of reinf ( 〕rcement to handle the large deformation region ， and thr numerical examples are given to illustrate the use of the proposed procedure ．

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