A MODIFIED METHOD FOR DEFINING CONCRETE DYNAMIC FAILURE SURFACE UNDER LOW-SPEED IMPACT FINITE ELEMENT ANALYSIS

To better apply concrete material test data to impact finite element analysis, the effect of strain rate parameters of general concrete constitutive model was analyzed. A linear interpolation method based on member test results was presented to eliminate the calculation error by modifying the concrete dynamic failure surface. A group of four lateral impact tests of reinforced concrete beams was employed for numerical simulation. Two were used to derive the proposed modified method, and the other two to testify the accuracy of the correction factor. Results of the four simulation were accurate. Moreover, an evaluation method was proposed to evaluate the adaptability of concrete constitutive models based on the modified method. It is shown that the modified method of determining dynamic failure surface reduces the calculation error and represents the dynamic response of concrete accurately. The evaluation method can assess the applicability of concrete constitutive models effectively.