Combining absolute values of response is done by operator type VAR_OPER = SUB_ABS. To get the absolute value of the difference of two terms (DRESP_1 and DRESP_2) the design response definition is as follows: DRESP ID_NAME = ..... DEF_TYPE = OPER VAR_OPER = SUB_ABS VAR_A = DRESP_1 VAR_B = DRESP_2 END_ | |||||||