求助：缺失箍筋的属性属性！急急急

liuguorui1216

我在提交作业后，出现以下错误：***ERROR: ELEMENT 1 INSTANCE GUJIN-1 IS MISSING A BEAM SECTION DEFINITION;
           CHECK ELEMENT SET AND ELEMENT DEFINITIONS
***NOTE: DUE TO AN INPUT ERROR THE ANALYSIS PRE-PROCESSOR HAS BEEN UNABLE TO
          INTERPRET SOME DATA.  SUBSEQUENT ERRORS MAY BE CAUSED BY THIS OMISSION
***WARNING: ONLY A BEAM SECTION PROPERTY OPTION MAY BE USED WITH ELEMENT 2
             INSTANCE GUJIN-1. CHECK THAT NO OTHER PROPERTY REFERS TO THIS   ELEMENT.
望各位高手多多指教！