While dealing with Rigid Diaphragm commands, you need to note the followings:
1. Full diaphragm definition should be provided in one line. Second diaphragm definition should be provided in second line. However, if there is joint-list, the list can extend to the second line with a continuation sign.
DIA f1 TYPE RIG YR f2 f3 JOI XR f4 f5 ZR f6 f7
DIA f11 TYPE RIG YR f21 f31 JOI XR f41 f51 ZR f61 f71
DIA f12 TYPE RIG JOI 35 45 51 TO 57 59 TO 83 -
90 TO 110
where f1, f11 and f12 are three rigid diaphragms located at floor height ranging between f2 and f3, f21 and f31 and the joints lying in the plane as indicated by their global Y coordinates respectively.
2. Diaphragms should be specified in ascending order i.e. diaphragms at first floor level should be specified first before specifying that on 2nd floor level and so on.
3. If user defined master joint is specified in one diaphragm, user defined master joints should be specified for all diaphragms. Combination of user defined master joint for one diaphragm and program calculated master joint for another diaphragm is not supported.
4. Before specifying floor diaphragm mass model (in terms of reference load) must be specified.
5. Floor diaphragm can be specified only once in an input file.
6. Floor diaphragm cannot be specified along with FLOOR HEIGHT command.
7. Floor diaphragm cannot be specified along with MASTER-SLAVE command.
8. Floor diaphragm cannot be specified with SET Z UP command.
9. Base level (or ground floor level or support level) is taken as the minimum of Y coordinates defined. Different base level can be specified using following syntax.
FLOOR DIAPHRAGM
DIA f1 TYPE RIG YR f2 f3 JOI XR f4 f5 ZR f6 f7
DIA f11 TYPE RIG YR f21 f31 JOI XR f41 f51 ZR f61 f71
....................................
BASE b1
where b1 = base/ground floor level of the structure
10. Maximum number of diaphragm allowed by the program (default value) is 150. If more than 150 diaphragms need to be specified SET RIGID DIAPHRAGM n must be specified before specifying joint incidence.
Please note point-7.
1. Full diaphragm definition should be provided in one line. Second diaphragm definition should be provided in second line. However, if there is joint-list, the list can extend to the second line with a continuation sign.
DIA f1 TYPE RIG YR f2 f3 JOI XR f4 f5 ZR f6 f7
DIA f11 TYPE RIG YR f21 f31 JOI XR f41 f51 ZR f61 f71
DIA f12 TYPE RIG JOI 35 45 51 TO 57 59 TO 83 -
90 TO 110
where f1, f11 and f12 are three rigid diaphragms located at floor height ranging between f2 and f3, f21 and f31 and the joints lying in the plane as indicated by their global Y coordinates respectively.
2. Diaphragms should be specified in ascending order i.e. diaphragms at first floor level should be specified first before specifying that on 2nd floor level and so on.
3. If user defined master joint is specified in one diaphragm, user defined master joints should be specified for all diaphragms. Combination of user defined master joint for one diaphragm and program calculated master joint for another diaphragm is not supported.
4. Before specifying floor diaphragm mass model (in terms of reference load) must be specified.
5. Floor diaphragm can be specified only once in an input file.
6. Floor diaphragm cannot be specified along with FLOOR HEIGHT command.
7. Floor diaphragm cannot be specified along with MASTER-SLAVE command.
8. Floor diaphragm cannot be specified with SET Z UP command.
9. Base level (or ground floor level or support level) is taken as the minimum of Y coordinates defined. Different base level can be specified using following syntax.
FLOOR DIAPHRAGM
DIA f1 TYPE RIG YR f2 f3 JOI XR f4 f5 ZR f6 f7
DIA f11 TYPE RIG YR f21 f31 JOI XR f41 f51 ZR f61 f71
....................................
BASE b1
where b1 = base/ground floor level of the structure
10. Maximum number of diaphragm allowed by the program (default value) is 150. If more than 150 diaphragms need to be specified SET RIGID DIAPHRAGM n must be specified before specifying joint incidence.
Please note point-7.